The LoverHeart is just a simple wearable for times when you and your boyfriend/girlfriend want to get noticed in crowded places at warm summer night. It can be used as a necklace bracelet or you can stitch it to a tshirt or cap. They dont light up untill another one is close to it. Also for battery save there is a switch on the side where top is closed and the bottom is open.
On later stages I am thinking of using NeoPixel and Gemma from AdaFruit for fancier lighting effects and quality use but you can keep it simple and don't use them.
*more information avaliable on the pdf file
a. Infrared Heart Beat transmitter:
Heartbeat transmitter is a simple 555 timer circuit. I had two options to decide for circuit;
- One of them is to use IR receiver commonly used in remote controllers which works 38kHz.
- The other is to use IR diode or IR transistor.
In the first case use 38kHz clock and 1 Hz for the second case. For the calculation of 555 circuit values I use the tools below:
Adafruit Circuit Playground iOS application
b. Heart Beat Light Circuit
When “Lover Heart” sees IR light of the other “Lover Heart” it just convert invisible light to visible LED light.