This requires the Pulse sensor to run at 3v !!!!
The signal pin of the pulse sensor should have a
2.2K inline to the ADC Pin
1K to GND from the ADC Pin
The original sketch should be modified or use the sketch from here.....
This replaces the Hardware interupt with a Tcker routine ......
Processing is required for the Full screen heartbeat display
Add an MPU6050 and send a tweet with Biometric Sensor results on Freefall Interupt....
<script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
Fall Detected: 1 Heart Rate: 84 BPM IBI: 718 mS Body Temperature: 21C Attitude Angle: 40 via an #ESP8266— MCU Automation (@MCUAutomation) January 24, 2016