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For LDR (light dependent resistor) datasheet and tutorial
I2C connection
Simply clip the Pulse Sensor to your earlobe or finger tip and plug it into your 3 or 5 Volt Arduino and you're ready to read heart rate
– DC current for the 3
Question1: What type of materials the sensor is made out of that contact the water
Adapter Power Supply (9VDC - 2A) PIC16F84A04/P For LDR (light dependent resistor)This is industry quality DC power adapter with 9V, 2A output. It has barrel jack connector. This adapter works well with arduino specially for duty applications that need relatively high current Specifications Input: 100 240V AC 50 60Hz Output : 9V, 2. 0A Dimensions: 80(L) x 45(W) x 30(H) mm Cable length: about 110CM Output adaptor : Barrel Jack