![]() In your ECG case, your little body is picking up huge mains noise, so you are in the biggest trouble. The most trouble making noise comes from the 220/110 50/60Hz mains noise, which is picked up by the PSU, through EMI and through connecting and grounding wires. Yes, noise is the most common ADC newbie sorrow. You might like to look at the AD8232 ECG of my own faint heart. I keep the wires out to the AD8232 very short by directly connecting to the duPont male header. I don’t use the 3.5mm plug and long wire. (For MCP3008, you might also like to use batteries very near by.) I just use batteries, keeping it very near the AD8232, and decoupled anything with Rpi. Yes, using power bank is good idea, because it is almost any noise free.I recommend to read the two references below. It is similar to the use of differential input or twisted pair wires to cancel out the noise. You use the Einthoven Triangle connection of your single lead to cancel out the mains noise pickuped by your body. Now the question is, How can I discharge my body when the sensor is directly connected to Raspberry Pi?I have also tried power supply of RPi from power bank giving output of 5V DC, 2100mA When I put the hand on the laptop body, my body gets discharged through the laptop body and the laptop body is always connected to Earth and the Arduino is also connected to USB port of the same laptop. In Above figure: Arduino Serial plotter – ECG SENSOR VALUES – (when I put the hand on my laptop’s body.)Īfter observing this, I realized that it’s the electrostatic charge of my body which get mixed with ECG and the noisy signal comes. I tried this process many times and also tried 3 different heart monitor sensors but the response was the same. Then I again lifted my hand from the laptop and the real ECG went away and noise started coming. Unintentionally, I placed my hand on my laptop’s body and the ECG started coming on the serial plotter. Just noisy data on the serial plotter of Arduino IDE. ![]() ![]() When I used the same sensor on Arduino UNO and Nano, the sensor was behaving the same. But when I use AD8232 Heart monitor sensor, it doesn’t give the right ECG data but only the noise. ![]() The code and circuitry I’m using are working and I have tested all the analogue sensors. I am making a project of Real-time ECG monitoring device using Raspberry Pi 3B+, Heart monitor AD8232 sensor by Keyes, MCP3008 ADC and 7″ HDMI LCD. I am giving supply to RPi using 5V DC charger connected to power supply of 220V AC. ![]()
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