PulseSensor connected to Arduino Nano along with algorithm code to read pulses from sensor then formulate BPM and send BPM values to NodeMCU ever Minute. and the nodeMCU with Lua firmware waits for BMP data, once received it updates BPM values to ThingSp
Using a NanoESP (Arduino compatible Nano and a esp8266) to send Brightness. More Info see http://iot.fkainka.de/day-19