Nrf52832 alarm device

This is very simple wearable device with a push button for emergency contact application. Click/double click/long hold will trigger app(android/ios) to SMS/Call friend/911. I have already hardware and schematic, pcb circuit.

I only need firmware.

1. click = sms

2. double click = call family

3. long hold = 911(emergency)

here, 911 = phone number for medical emergency

Nrf52832 sends signal(click/double click/long hold) to mobile app via bluetooth interface. In generally, nrf52832 is in sleep state. If you will click the button, 52832 wake up from sleep and send certain strings to mobile via bluetooth. For example, if you click one click, 832 send 11, if you click double click, 832 send 22, if you hold longly, 832 send 33. Pin for button can know from schematic schematic.

source code : [login to view URL]

apk: [login to view URL]

Skills: Android, Arduino, Electronics, Microcontroller, Mobile App Development

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About the Employer:
( 0 reviews ) Liaoningsheng, China

Project ID: #16939996

18 freelancers are bidding on average $402 for this job


HI I am experienced embedded system developer I have worked with nRF52832 before. I am sure I can deliver it to you. Please get in touch to discuss it in further details Regards

$666 USD in 7 days
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Hi, Client I have almost 8 years of experience in development of products including the custom electronics. I am an Electronics and Electrical Design Engineer with the areas of expertise in Embedded System, product More

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Hi there , I am Electrical + Software engineer with 19 years experience . I am interested in your project Nrf52832 alarm device ,Kindly send me a private chat message since this is a public post . :

$2500 USD in 30 days
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Hi Sir, We are best for writing firmware. We are very professional in C language and do embedded system from last many years. Lets discuss with us. we are used to with these NRF chips. We are professional enginee More

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$277 USD in 3 days
(5 Reviews)

I use nRF52 devices and can make this application for you What environement would you prefer - Keil or ArduinoIDE ?

$80 USD in 3 days
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Hello, Hope you are doing well, We have gone through with your project detail and we need to know more about it. Please check these links for work experienced Android Apps: [login to view URL] More

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Linkedin: [login to view URL] I'm an IoT based enthusiast and top IoT Thought Leader 2016 & 2017 in the IoT ecosystem based on exemplary contribution towards advancement of the IoT in In More

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I am here to create and design, professional, stunning eye-catching and modern looking Android Apps for you as per your requirement and budget. As a freelancer i also working for a Canadian based company as Android More

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I am well experienced in microcontroller and android app development. The biggest advantage of hiring me is that i could work at the cheapest [login to view URL] bid i placed above is negotiable. Relevant Skills and Experience S More

$111 USD in 5 days
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Hi! Your project is very interesting! Can you share some details? Can you also tell , which protocol should use this device to transmit a signal?

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Hello Sir/Madam, I have gone through your post and delighted to say that I am looking forward to work with you. Having garnered years of experience and expertise in the relevant field, I am sure that I can swimmingl More

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Hi, I’m currently heading a team of more than 50 individuals with separate teams for Android and iOS. My company is over 6 years old but my experience in the field is over two decades now. I have worked with More

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