PRE2020 3 Group4

Group members

Name	Student ID	Department	Email address
Mark den Besten	1022231	Automotive Technology	m.d.besten@student.tue.nl
Yann van Eijk	1454447	Mechanical Engineering	j.h.m.v.eijk@student.tue.nl
Ilse Schuckman	1239641	Electrical Engineering	i.schuckman@student.tue.nl
Rik Schutte	1005841	Psychology & Technology	r.j.r.schutte@student.tue.nl
Roel Wijands	1235389	?	?

Problem statement

Every minute is crucial when providing aid to someone who has an out-of-hospital cardiac arrest (OHCA). The highest survival rates are achieved when the patients receive defibrillation as fast as possible (Jafri, 2021). The time it takes for an ambulance to arrive, however, is usually too long to ensure good survival odds for the patient (Solanki, 2017). In order to reduce the average time between an arrest and defibrillation, automatic external defibrillators (AEDs) are placed in public areas. These AEDs are placed in cabinets that are often locked, so they are protected from acts like vandalism. The people that can access them are usually the owner(s), their employees, and citizen responders. Citizen responders are people who have followed CPR and AED courses and are registered in a national database. When an OHCA occurs, nearby citizen responders are alerted via text message to the location of the closest AED and the place of the incident (Burgerhulpverlening 2021). They have an app on their phone which provides them with the code that unlocks the cabinet. However, because the situation is both stressful and extremely time-sensitive, the time and effort it takes to read and input a code correctly is unwanted. The aim of this project is to remove this process and thereby reduce the average time between an arrest and defibrillation.

How it currently works

HartslagNu is the paging system that calls up emergency responders via a message on the mobile phone to go to the scene in case of possible resuscitation. In many cases, emergency responders (Also known as "Burgerhulpverleners") are able to respond quicker to an emergency situation than the emergency services, due to the basic concept of coverage (work this out, or leave it out). It is important to be able to notify the emergency responders as quickly as possible, to keep this time advantage.

The current state of the HartslagNu system in the Netherlands is well seen from a technological standpoint. The user gets to enter their home and/or work address online or within the HartslagNu app, and based on that information the user can be contacted via SMS in the case of an emergency. In addition to this basic feature, the application also allows the user to turn on their location and let the application track their GPS signal. When the user is near an emergency location, the application sends them a notification containing the location of a possible resuscitation. It is important to make the distinction between the SMS-based function and the application-based function, these two can work separately from each other and in addition to each other. HartslagNu thus assumes that everyone has a mobile phone, but not everyone (always) has an internet connection on his/her phone. To use the application the user has to have an internet connection and allow for the app to send push notifications.

Emergency responders are trained to start up the resuscitation, preferably using an AED (Automatic External Defibrillator). These AED's are publically available all over the Netherlands and are usually protected by a pin code on a so-called AED box. The Emergency responders are able to get access to this AED by retrieving the pin code either via SMS or in the application. This, however, takes time and sometimes does not work at all. This time loss can result in the loss of lives or the cause of brain damage at the victims' end. This is where an adaption to the current system can be made and what this project is all about.

Objectives

The main objective is to design a new locking system for a publicly placed AED. First, anyone with the right clearance has to be able to access the AED as fast as possible, without having to do any additional actions like filling in a code. Second, the AED must be protected from incidents like vandalism and should not be accessible to anyone that is not authorized to. To meet these requirements, the design will include an app on the smartphone of someone who should have access and a way to determine the distance between this person and the AED. When someone has the app and is physically close to the AED, the cabinet should be unlocked automatically without any other user input needed.

Users

There are two main users that have to interact with the AED locker.

Firstly, the first responders to an emergency, the so-called “burgerhulpverleners”. A first responder gets a notification on his cellphone and has to, as quickly as possible, get an AED to the victim that is having an emergency. An AED should get to the victim within 6 minutes (bhvnederland, 2018), every second counts. A first responder should therefore have quick and easy access to the AED. Quickly, because lives are at stake. Easily, because in the heat of the moment a first responder might not think logically and slowly. The first responder should not have to think about getting a door unlocked.

Secondly, the owners and maintainers of the AED and its locker. To put an AED outside is voluntary. Therefore when an AED is damaged or lost it’s a loss for the owner. An AED should be sufficiently protected from malicious users. Right now a pin code is used for this (HartslagNu, 2021). The maintainers also would like to keep their costs and maintenance low. So it should not cost a lot extra. Additionally, these owners already have a locker that functions well. They do not want to buy a new one before the old one is written off.

Additionally, there is the owner of the app and database of all the AEDs in the Netherlands, HarstslagNu. If we improve the interaction between the AED lockers and their app. It should be easy to implement. There should also be some new entry for their database, of what type of locker it is. Especially in the beginning when not all lockers are upgraded. The app should know what kind of locking system the locker uses.

To further detail the user requirements, the following user scenarios were created:

Dirk

Dirk is a 32-year-old man living in Helmond. He is a licensed aid worker and is part of the NIBHV network (the national aid worker network). On a given Saturday, he was taking a walk in the park when he got a message on his phone. A text from HartslagNu, that someone in the area was having a heart attack. He opens the HartslagNu app and accepts the call for action. The app shows him the route to the afflicted person as well as the nearest AED for him to take with him. The app also gives him the code to open the box which houses the AED that he is assigned to. He hurries to the AED as quickly as possible and gets there in 3 minutes. The route shows that it is another 2 minutes to get to the victim. As he knows from his training, he should get there within 6 minutes as the victim might end up with permanent brain damage otherwise. This gives him 1 minute at most to get the AED and hurry along.

However, when he arrives at the AED box, there is a problem. The box is locked and requires a pin code to open. He remembers that the app should have a code for him to unlock the box, so he grabs his phone and opens the app. After looking at the app, he cannot find the code. In the meantime, another responder shows up and starts looking for the code too. After 2 minutes, they finally find the code and open the box. After grabbing the AED, they hurry towards the victim together. They arrive at the scene 7 minutes after the call was made. When they want to start helping the victim, they hear sirens coming closer. The ambulance shows up and takes over the care for the victim. So, in the end, Dirk and the other responder could not do anything and go back to where they got the AED from to return it.

Mandy

Mandy is a 43-year-old woman living in Rotterdam. She owns a small store in the area and is also a certified company aid worker. She is part of the HartslagNu network and was looking through the AEDs in the area when she noticed a lack of AEDs in the area around her store. Because of this, she decides to invest in an AED at the shop. She intends for the AED to be placed just outside the shop so it can be utilized for general emergencies. One of her worries is that certain people, say a drunk man after a night out, would steal the AED, so she decides to get an AED with a lock. The Dutch heart foundation advises her to get one with a pin code as it is more resilient against weather conditions.

To fund this endeavour, she approaches the municipality. She poses her problem and requests some financial aid to make this happen, as it would benefit the entire neighbourhood. The council in Rotterdam agrees and wants to cover half the costs of the AED. With half the costs dealt with, Mandy can afford to get the AED installed. To make it easier on herself, she arranges one with self-testing capabilities. This causes the AED to send a message to her over Wi-Fi when something is wrong. Apart from that, maintenance only involves changing out batteries which is done by the company she bought the AED from. One afternoon, someone rushed over to her AED, and took it out of the box. After about 10 minutes it was returned without issue. That same night, she saw a story on the local news about some being reanimated using an AED. This proved to Mandy that having an AED installed is definitely worth it.

User requirements

Brain damage can occur within 6 minutes of cardiac arrest (bhvnederland, 2018). Considering the average response time for civilian first responders is between 5.5 and 7.5 minutes (Dagblad van het Noorden, 2019), every second counts. As such, the box housing the AED should open in no less than 15 seconds to ensure quick access.

To make it easy to open the box, it should not require any extra operations from the user. So, during an emergency, opening the app should not be required to open the box.

The users also require the AED to still be in the box. This involves creating a tamper-resilient box with a robust locking mechanism that keeps unwanted people out while maintaining ease of use for the certified users. Since it is connected to an online system, this framework also requires tight security such that people cannot falsely certify themselves and gain access to the AED.

In case of a bug in the app or the system malfunctioning, an alternative way of opening the box containing the AED needs to be present as well. This is also for users that do not wish to use the app, whether that is because of a lack of technological understanding or a desire to protect all their data. As such, the new way of opening the box needs to be an addition rather than a replacement.

When there is no active emergency, the lock should not open, even when certified users of the app walk past. This excludes maintenance. This is to prevent the box from randomly opening when users walk past it unknowingly.

When the AED has been removed from the box, it should be easy for the first responder to return the AED to the box and to close and lock the box. The box should not be locked when the AED is not present in it. This prevents the box from locking itself when the AED is not contained in it. This way the owner can perform the mandatory check-up of the AED.

For the owners, it is vital that the system is easy to be installed and requires very little maintenance. High levels of upkeep would be bothersome for the owners and would also disincentivize people from getting AEDs in the first place. While an initial installation has to be done, including the necessary wiring, further upkeep must be kept at a minimum. Since the AED needs to be tested once a year, the lock should also be tested once a year at a minimum.

The price of this newly developed technology should be reduced to encourage buyers to implement this device on their AEDs. The cost for upkeep should also not be increased by more than 3 percent of the existing cost. This is due to the high cost of upkeep as is (Medisol), and people might get deterred from installing an AED if the cost becomes even higher.

User survey

Voluntary first responders

Q1: How long have you been a voluntary first responder?

Q2: How often have you retrieved an AED?

Q3: How are you notified by HartslagNu of a possible emergency?

Q4: Did you ever have to use an AED where a pincode was needed to access it?

Q5: If yes, did you encounter any difficulties while accessing the AED?

Q6: Is there anything you would change about the current methods used to access locked AEDs?

Q7: If you were called to retrieve an AED, do you think the amount of time and/or stress would be significantly reduced if a locked cabinet were unlocked remotely so you no longer have to enter a pincode?

AED owners

Q1: For how long have you owned an AED?

Q2: Is your AED placed in a cabinet that requires a pincode to open?

Q3: Why did or did you not choose this option?

Q4: Has your cabinet and/or AED ever been damaged due to (attempted) vandalism or theft?

Q5: In regards to the security of your AED, how would you feel if your cabinet was unlocked remotely at the same time as the voluntary first responders are notified of an incident?

Current cabinet designs

There are a plethora of different cabinets currently in use. For this project, the type of cabinets that are of interest are those in outdoor public places that require a pincode to open. These cabinets do share some functionality, namely they are all ventilated, illuminated and have an alarm. The remaining functionality differences are summarized in the table below.

Manufacturer	Pyrescom	GT Medicare B.V.
Cabinet	AIVIA	SmartCase	SixCase
Type	210	SC1240	SC1340	SC1340P	SC1340M	SC1340PM	SC1440	SC1440P	SC1440M	SC1440PM
Pin	Touchscreen	Rotary knob	Touchscreen	Touchscreen	Touchscreen	Touchscreen	Touchscreen	Touchscreen	Touchscreen	Touchscreen
Mechanical lock	-	-	-	-	Yes	Yes	-	-	Yes	Yes
Material	PC/ABS	SST	Aluminium	Aluminium	Aluminium	Aluminium	SST	SST	SST	SST
Temperature	-20° C	-20° C	-15° C	-25° C	-15° C	-25° C	-15° C	-25° C	-15° C	-25° C

Design options

Method	Brief description	Functionality needed for the cabinet*	Additional actions needed to function**	Reliability	Maintenance/Risk
Bluetooth	Anyone with the app can connect to the cabinet via Bluetooth. If a connection is established, the cabinet will open.	-Bluetooth	None	High	All electronics can be equipped inside the cabinet, reducing risk of damage.
GPS	GPS is used to determine the user's position relative to the AED. If they are close, the cabinet receives a signal and opens.	-Internet or GSM	None	High	The current implementation already makes use of GPS. All electronics can be equipped inside the cabinet, reducing risk of damage.
Wi-Fi Direct	When the user receives an alert via the app, their phone will start searching for devices to pair with via Wi-Fi Direct. The cabinet will open when a connection has been established.	-Wi-Fi -Other	The user has to finalize the pairing between the smartphone and the cabinet in some way. Possible options: Bluetooth, NFC, button press.	High, but lower than Bluetooth or GPS due to the additional connection/method needed.	Most/all electronics can be equipped inside the cabinet, reducing risk of damage.
Biometric	Anyone who downloads the app must submit fingerprints/facial picture to a database. The cabinet will open to anyone that matches.	-Internet -Camera or fingerprint scanner	The user has to pass a biometric lock.	Facial recognition is fallible, especially for people with a darker ethnicity. (Klare, 2012)	A database has to be updated regularly. The exteriors of all cabinets have to be equipped with electronics, increasing risk of damage.
NFC	The user transmits the code received through the app via NFC. When installed, each cabinet is given a unique code.	-NFC-tag	The user has to hold their phone to a scanner.	The high stress situation may cause the user's hands to tremble too much.	All cabinets need to be equipped with an NFC tag on the exterior, increasing risk of damage.
QR-code	The cabinet has a camera that can read a QR-code generated by the app. Each cabinet that is installed has its own unique code that does not change.	-Camera	The user has to hold their phone to a camera.	May not be reliable in poor lighting conditions. Due to the high stress situation, the user's hands may tremble too much.	Electronics vulnerable to damage have to be installed on the exterior of all cabinets, increasing risk of damage.

*Assuming the user has a modern smartphone with up-to-date functionality.

**Apart from the user having the app and being in the vicinity.

Selected design

Description

We have chosen to use SMS as a communication tool. The lock will get an SMS module and on receiving an SMS with a specific text e.g. "OPEN", the AED locker will unlock. The Server of HartslagNu, on receiving an alert from the 'Meldkamer' will, in addition to alerting BHVers, send an SMS to the AED locker, unlocking the locker.

Motivation for SMS

We have chosen to use SMS as a way of communication to the AED locker. There are three main reasons we chose this technology. Firstly we know that the server of the meldkamer and hartslagnu already works with SMS. They send an SMS to the Burgerhulpverlener or BHVer to alert him. Secondly, SMS has a high national coverage, practically 100% in urban regions ( https://www.kpn.com/netwerk/dekkingskaart.htm ). This means our system will work everywhere there is a mobile network, which is practically everywhere. Thirdly, this is easier for the users of the app. We do not need to communicate via their mobile phone, which would create an extra point of failure, and more compliance of the Users

Risk scenario analysis

The currently proposed solution might make the AED more vulnerable to thefts, this is because the AED is accessible for a bigger window of time. In this section, the increase of risk will be assessed in order to persuade all users of the importance of our solution.

Numbers of thefts in the current situation

The amount of stolen AED's is traceable due to the existence of a database for stolen AED's. This database is for owners of AED's to report their stolen AED using its unique serial number. The stealing of AED's is rare according to this database (Gestolenaed, 2019), around five to ten AED's get stolen each year in the Netherlands. This makes it rare since there are around 100000 AED's in the Netherlands, making the theft rate around 0,01 percent of AED's get stolen annually. There are a few reasons why AED theft is uncommon:

1. AED's contain their own unique serial number, which makes tracking down stolen AED's much easier (Gestolenaed, 2019).

2. Selling a stolen AED on second-hand websites is not useful since most people prefer to buy a brand new AED (Bos, 2019).

3. The parts that make an AED are not in demand on the second-hand/black market, so trying to sell for the part also does not make sense (Bos, 2019).

4. The language set on an AED is not easy to change, so selling to foreign countries does not make sense (Bos, 2019).

5. Currently, AED's are well protected by an electronic lock.

The AED's that do get stolen sometimes do end up abroad but are able to be traced back to the original owner. Vandalism is also a reason why some AED's get stolen. Not every AED will be found after it has been stolen, so the real reason behind every theft is unknown (Bos, 2019).

Increase of theft risk in the new situation

In the new situation, AED boxes will be open for a longer period of time, the owners of the AED might see this as an increase of risk on their side. To put the owners at ease, 3 main points are made why the risk will not increase:

1

2

3

Due to the current consensus on why AED's generally do not get stolen, the assumption can be made that the risk will not significantly increase when the new solution will be implemented.

Prototype

Due to certain limitations on pricing, scaling and availability of parts, our demonstration prototype will differ from the design in several ways. One such a way is the use of an Arduino Nano inside the box itself. When implemented on a bigger scale, cheaper and smaller microcontrollers should be used to lower the cost take up less space. However, due to the ease of use of an Arduino Nano, its availability, and its large selection of libraries, we shall be using it for the demonstration. Functionality wise, this changing nothing.

Considering the way HartslagNu works, we can assume they have their own server set up somewhere. Adding the SMS functionality with the gateway through an ISP is a viable option because of the scale of the operation and all the information the server already has access to. However, for our demonstrative purposes, we will be setting up a server on a Raspberry Pi with an external SMS module for sending the text messages. This is due to the small scale of our prototype, though the functionality is practically the same. Especially since the Raspberry Pi also has webserver capabilities if we so desire.

By using separate GSM modules instead of the webserver, double the number of SIM cards is required, though only the one used for sending texts needs credit. Because of the scale, which prepaid card is being used is of very little importance as long as the ISP it belongs to covers all corners of the country. Pricing is less of a factor because of this.

System Diagram for the Prototype

State of the Art

[1] Cho, H., Ji, J., Chen, Z., Park, H., Lee, W. (2015). Measuring a Distance between Things with Improved Accuracy. Procedia Computer Science, 52, 1083-1088. Retrieved from: https://doi.org/10.1016/j.procs.2015.05.119

A Bluetooth based design for measuring distance between objects using Bluetooth Low-Energy (BLE). The results showed that it is possible to attain an accuracy of 90% in a radius of 1.5 meter.

[2] Drawil, N. M., Amar, H. M., Basir, O. A. (2013). GPS Localization Accuracy Classification: A Context-Based Approach. IEEE Transactions on Intelligent Transportation Systems, 14(1), 262-273. Retrieved from: https://ieeexplore.ieee.org/document/6295661

A study that compares the pros and cons of different GPS localization methods.

[3] Eisenberg, M. S., Horwood, B. T., Cummins, R. O., Reynolds-Haertle, R., & Hearne, T. R. (1990). Cardiac arrest and resuscitation: A tale of 29 cities. Annals of Emergency Medicine, 19(2), 179-186. doi:10.1016/s0196-0644(05)81805-0

Old article at the base of fast-response knowledge investigating the survival rates in 29 different cities depending on the rate and speed of response including which method was used by whom. So option like direct CPR or some time passing before someone with AED arrives. Concludes faster CPR is key to survival but still defibrillation is needed.

[4] Everything you need to know about smart locks. (2021, February 01). Retrieved February 12, 2021, from https://www.safety.com/smart-locks/guide/

Article about safety surrounding smartlocks. This article discussed the opportunities as well as the pros and cons.

[5] H. Oguma, N. Nobata, K. Nawa, T. Mizota and M. Shinagawa, "Passive keyless entry system for long term operation," 2011 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, Lucca, 2011, pp. 1-3, doi: 10.1109/WoWMoM.2011.5986125.

Talks about keyless entry systems of vehicles. Makes use of synchronized keys.

[6] Jeong, H. J., Lee, W., Lim, J., & Hyun, W. (2015). Utilizing a bluetooth remote lock system for a smartphone. Pervasive and Mobile Computing, 24, 150-165. doi:10.1016/j.pmcj.2015.07.010

Talks about a Bluetooth lock and how this should work with an smartphone app. However the phone first has to pair with the smartphone so in this state does not work for multiple unknown devices.

[7] Koster, R. W. (2013). Modern BLS, dispatch and AED concepts. Best practice & research. Clinical anaesthesiology, 27(3), 327–334. Retrieved from: https://doi.org/10.1016/j.bpa.2013.07.005

A study that presents the current strategies for OHCAs. It concludes that AEDs are of critical importance when providing aid, especially before the arrival of an ambulance.

[8] Mair, N., Mahmoud, Q. H. (2012). A collaborative Bluetooth-based approach to localization of mobile devices. 8th International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom), 363-371. Retrieved from: https://eudl.eu/doi/10.4108/icst.collaboratecom.2012.250437

Another design based on Bluetooth to determine position. It uses the combined Bluetooth connections of multiple devices. The results also show that, while it is slower than GPS, Bluetooth localization is faster than Wi-Fi or cellular methods.

[9] R. Karani et al., "Implementation and design issues for using Bluetooth low energy in passive keyless entry systems," 2016 IEEE Annual India Conference (INDICON), Bangalore, 2016, pp. 1-6, doi: 10.1109/INDICON.2016.7838978.

Another Bluetooth lock. This one with a focus on low-power Bluetooth. It uses a whitelist for checking which devices may unlock. The white list is controlled by an admin terminal.

[10] Smith, C. M., Lim Choi Keung, S. N., Khan, M. O., Arvanitis, T. N., Fothergill, R., Hartley-Sharpe, C., . . . Perkins, G. D. (2017). Barriers and facilitators to public access defibrillation in out-of-hospital cardiac arrest: A systematic review. European Heart Journal - Quality of Care and Clinical Outcomes, 3(4), 264-273. doi:10.1093/ehjqcco/qcx023

This article explores the different areas which affect the response in assisting in defibrillation and partaking in accessing defibrillators. The study concludes that there is very little evidence in this field and more research should be done into these different factors.

[11] Smith, C. M., Wilson, M. H., & Perkins, G. D. (2018). Reply to: Letter by Derkenne et al. regarding the Article, ‘the use of trained volunteers in the response TO Out-of-hospital cardiac Arrest – The GoodSAM experience.’. Resuscitation, 125, E4. doi:10.1016/j.resuscitation.2018.02.002

The investigation looking at GoodSAM in England, a system somewhat similar to HartslagNu in the Netherlands investigating the acceptance of the system and willingness of people to actually partake in resuscitation including accessing an AED.

[12] Smith, C. M., Wilson, M. H., Ghorbangholi, A., Hartley-Sharpe, C., Gwinnutt, C., Dicker, B., & Perkins, G. D. (2017). The use of trained volunteers in the response to out-of-hospital cardiac arrest – the goodsam experience. Resuscitation, 121, 123-126. doi:10.1016/j.resuscitation.2017.10.020

Article exploring the effectiveness of more participation of ‘bystanders’ in performing in a resuscitation. This participation is achieved via the GoodSAM application which alerts volunteers nearby of a resuscitation request.

[13] Stieglis, R., Zijlstra, J. A., Riedijk, F., Smeekes, M., van der Worp, W. E., & Koster, R. W. (2020). AED and text message responders density in residential areas for rapid response in out-of-hospital cardiac arrest. Resuscitation, 150, 170–177. Retrieved from: https://doi.org/10.1016/j.resuscitation.2020.01.031

A study that shows the effects of increasing the density of AEDs and Text Message responders in residential areas. It concludes that the text message system is most effective when there are at least two AEDs and ten TM-responders per square kilometer. The number of patients who were defibrillated in under 6 minutes doubled when these two conditions were met.

[14] Waar zijn nog AED's Nodig? (2020, September 10). Retrieved February 12, 2021, from https://hartslagnu.nl/aed/waar-in-nederland-zijn-nog-aeds-nodig/

Site with an interactive map showecasing the current spaces where there isn’t an AED in the near vicinity. Based on a history of resuscitation attempts. The rule of thumb here is that there should always be an AED within a 500m radius.

Planning

Week	Task 1	Task 2	Task 3	Task 4	Milestones (end of the week)
Week 1	Pick subject	Collect information	Make a planning	Update the wiki-page	Subject chosen
Week 2	Work out the different types of connections	Decide on the framework of the app	Electrical design of the lock	Update the wiki-page	Design plan has been made
Week 3	Bill of materials	Work out final design details	Begin working on the code	Update the wiki-page	None/week of progress
Week 4	Make the prototype	Continue working on the app	Make a box for demonstration	Update the wiki-page	App and box are finished
Week 5	Continue making the prototype	Make test plan and test prototype	Test individual parts	Update the wiki-page	Analysis of the prototype has been done
Week 6	Improving on the prototype	Make final design	Make test plan and test final design	Update the wiki-page	Final design is finished
Week 7	Begin filming the presentation	Edit the film for demonstration		Update the wiki-page	Film for demonstration is finsihed
Week 8	Peer review	Last preparations for demonstration		Finalize the wiki-page	Presentation/demonstration

Work done per week

Week 1

Name	Total [h]	Break-down
Mark den Besten	7	Meetings [3h], Starting lecture [1h], Research and writing User part [3h]
Yann van Eijk	7	Meetings [3h], Starting lecture [1h], Research and writing Approach, milestones and deliverables [3h]
Ilse Schuckman	8.5	Meetings [3h], Starting lecture [1h], Research and writing Problem statements & objectives [4.5h]
Rik Schutte	8	Meetings [3h], Starting lecture [1h], Research and writing User requirements [4h]
Roel Wijnands	7	Meetings [3h], Starting lecture [1h], Research and checking references [3h]

Week 2

Name	Total [h]	Break-down
Mark den Besten	10	Meetings [4h], Research Design options [3h], Researching SMS API [3h]
Yann van Eijk	10	Meetings [4h], Rewriting User requirements [2h], Implementing work done in Week 1 on the wiki page [1h], Fixing SotA and References [3h]
Ilse Schuckman	7.5	Meetings [4h], Research and Design options [3h], updating wiki [0.5h]
Rik Schutte	9	Meetings [4h], Rewriting User requirements [2h], Research SMS API + Options [3h]
Roel Wijnands		Meetings [4h]

Week 3

Name	Total [h]	Break-down
Mark den Besten		Meetings [4h]
Yann van Eijk	8	Meetings [4h], Survey [1.5h], How it currently works [1.5h], Reference searching [1h]
Ilse Schuckman	8	Meetings [4h], Current cabinet designs [2.5h], Survey [1.5h]
Rik Schutte	9	Meetings [4h], Creating user scenarios [2h], GSM module + RaPi webserver research [3h]
Roel Wijnands		Meetings [4h]

Week 4

Name	Total [h]	Break-down
Mark den Besten		Meetings [4h]
Yann van Eijk		Meetings [4h], researching/writing risk analysis [3h]
Ilse Schuckman		Meetings [4h], Adjust survey [1h]
Rik Schutte		Meetings [4h]
Roel Wijnands		Meetings [4h]

Week 5

Name	Total [h]	Break-down
Mark den Besten
Yann van Eijk
Ilse Schuckman
Rik Schutte
Roel Wijnands

Week 6

Name	Total [h]	Break-down
Mark den Besten
Yann van Eijk
Ilse Schuckman
Rik Schutte
Roel Wijnands

Week 7

Name	Total [h]	Break-down
Mark den Besten
Yann van Eijk
Ilse Schuckman
Rik Schutte
Roel Wijnands

Week 8

Name	Total [h]	Break-down
Mark den Besten
Yann van Eijk
Ilse Schuckman
Rik Schutte
Roel Wijnands

References

[1] Bhvnederland. (2018, July 27). Yearly 5,300 people die in The Netherlands due to heart attack. Retrieved February 21, 2021, from https://www.bhvnederland.nl/bhv-nieuws/aed-infographic-en

[2] Bos, M. (2019, December 14). Wat kunnen dieven eigenlijk met een gestolen aed? Retrieved March 02, 2021, from https://www.ad.nl/dordrecht/wat-kunnen-dieven-eigenlijk-met-een-gestolen-aed~a3cb6357/

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