Read Part 1 here. 

I updated the Pulse Sensor project to give the Pulse Receiver a GPS. 

Now the Pulse Sender (the wearable that you will strap on your wrist) will send your pulse rate to the Pulse Receiver (which you will wrap around your waist) and then, apart from learning about your pulse rate, it knows where on earth you are.

Bill-Of-Materials

I wish to build a Bluetooth-based pulse sensor. Imagine a Fitbit that takes your pulse rate as you exercise and send this data real-time to your mobile phone.

Hardware