0.28inch 3.5-30V Two Wire DC Voltmeter Blue KY-039 Finger Heartbeat Detection Sensor ensure the band sits snugly

ensure the band sits snugly on your wrist with the sensor making consistent contact with skin

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5V for alkaline cells

use the Adafruit SSD1306 library or SeeedStudio's U8g2 library available through the Arduino Library Manager

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0.28inch 3.5-30V Two Wire DC Voltmeter Blue KY-039 Finger Heartbeat Detection Sensor ensure the band sits snugly0. 28inch 3. 5 30V Two Wire DC Voltmeter Blue 0. 28inch 3. 5 30V Two Wire DC Voltmeter Blue This is tiny and compact digital voltmeter with blue LED Display. The DC 3. 5 30V 2 Wire Blue LED Display Digital Voltage Voltmeter Panel requires only a few minutes of configuration and is as simple as directly connecting wires to the source you want to measure and seeing the LED blink!!!! The red wire is to connect to the positive pole, the black wire is to