<h3>"Cannot read or The analog reading is always 0"</h3>

1. Check whether the code wiring is correct; 2. Whether the use method is correct, pay attention to use the strap to tie the module to the finger, and do not press the back of the sensor with your hand; 3. Check whether the plastic film on the sensor is in good condition, without plastic film SEN0203 can not work (it can be replaced by transparent tape)Note:It is recommended to fix the probe on the finger pulp when using the test<figure class="image"><img src="https://dfimg.dfrobot.com/628da052aa9508d63a41e164/makelog/a10a15810e876a86a3b6482e808da6b0.png"></figure>

"Cannot read or The analog reading is always 0"

1. Check whether the code wiring is correct; 2. Whether the use method is correct, pay attention to use the strap to tie the module to the finger, and do not press the back of the sensor with your hand ; 3. Check whether the plastic film on the sensor is in good condition, without plastic film SEN0203 can not work (it can be replaced by transparent tape) Note:It is recommended to fix the probe on the finger pulp when using the test

Gravity: PPG Heart Rate Monitor Sensor for Arduino (Analog/Digital)

Name: Gravity: PPG Heart Rate Monitor Sensor for Arduino (Analog/Digital)
Brand: DFRobot
SKU: SEN0203
Price: 16 USD
Availability: InStock
Rating: 5.00 (1 reviews)

Introduction

The DFRobot heart rate sensor is a thumb-sized heart rate monitor designed for Arduino microcontrollers.

This heart rate monitor sensor is a pulse sensor which is developed based on PPG techniques. This is a simple and low-cost optical technique that can be used to detect blood volume changing in the microvascular bed of tissues. It is relatively easy to detect the pulsatile component of the cardiac cycle according to this theory.

The sensor has two holes that you can use to attach to your belt. You can wrap on your finger, wrist, earlobe or other areas where it has contact with your skin.

A Gravity Interface is adapted to allow plug&play to ease the barrier of usage. The IO sensor shield is the best option to connect this heart rate sensor with your Arduino or other microcontrollers. Besides, this sensor can also be compatible with Raspberry Pi, intel edison, joule and curie by means of 3.3V Input Voltage.

Gravity: Heart Rate Monitor Sensor For Arduino Demo Project 2

Gravity: Heart Rate Monitor Sensor For Arduino Demo Project 1

Heart RateTest

IoT Based Heart Rate Monitoring System is a very basic project on sending the pulse rate to Blynk Application and monitoring it from anywhere.

NOTE:
1. This product is NOT a professional medical device and should not be used to diagnose or treat medical conditions.
2. This sensor is designed to work when the user is not moving. If used while moving it will give inaccurate results.

Gravity Heart Rate Sensor Selection Guide


Name	Gravity：Analog ECG Heart Rate Sensor	Gravity：Analog/Digital PPG Heart Rate Sensor
SKU	SEN0213	SEN0203
IC/Module	AD8232	SON1303
Operation Voltage(VCC)	3.3～6V	3.3～6V
Output	Gravity: Analog (Digital 0～3.3V)	Gravity: Analog/Digital (Analog 0～VCC) (Digital 0～VCC)
Measurement Principle	ECG（Electrocardiogram）	PPG（Photo Plethysmo Graphy）
Average Power	<10mA	<10mA
Dimension (PCB)	35*22 mm	28*24 mm
Features	1.ECG method, accurate and stable 2.Three electrodes 3.3.3V/5V compatible	1.PPG method, convenient and fast 2.Analog (pulse wave) & Digital(heart rate), configurable output 3.3.3V/5V compatible