Documentation

// AD8232 ECG Module - Arduino Example
// Prints raw ECG samples for the Arduino Serial Plotter.
// OUTPUT -> A0, LO+ -> D10, LO- -> D11

const int OUTPUT_PIN = A0;
const int LO_PLUS    = 10;
const int LO_MINUS   = 11;

void setup() {
  Serial.begin(9600);
  pinMode(LO_PLUS,  INPUT);
  pinMode(LO_MINUS, INPUT);
}

void loop() {
  // Leads-off detection: either line goes HIGH when an electrode is disconnected
  if (digitalRead(LO_PLUS) == HIGH || digitalRead(LO_MINUS) == HIGH) {
    Serial.println(0);   // Plot a flat line while leads are off
  } else {
    int ecg = analogRead(OUTPUT_PIN);  // 0 - 1023 on Arduino
    Serial.println(ecg);
  }

  // ~200 Hz sample rate
  delay(5);
}

#!/usr/bin/env python3
# AD8232 ECG Module - Raspberry Pi Example (via MCP3008 ADC)
# Install: pip3 install spidev gpiozero
# AD8232 OUTPUT -> MCP3008 CH0
# LO+ -> GPIO 27, LO- -> GPIO 17

import spidev
import time
from gpiozero import DigitalInputDevice

LO_PLUS  = DigitalInputDevice(27)
LO_MINUS = DigitalInputDevice(17)

spi = spidev.SpiDev()
spi.open(0, 0)
spi.max_speed_hz = 1_350_000

def read_adc(channel):
    # MCP3008 single-ended read
    r = spi.xfer2([1, (8 + channel) << 4, 0])
    return ((r[1] & 3) << 8) | r[2]

print("AD8232 ECG Demo (Ctrl+C to stop)")

try:
    while True:
        if LO_PLUS.value or LO_MINUS.value:
            print(0)              # leads off
        else:
            ecg = read_adc(0)     # 0 - 1023
            print(ecg)
        time.sleep(0.005)         # ~200 Hz
except KeyboardInterrupt:
    print("\nStopped by user")
finally:
    spi.close()

# AD8232 ECG Module - Pico MicroPython Example
# OUTPUT -> GP26 (ADC0), LO+ -> GP14, LO- -> GP15

from machine import ADC, Pin
import time

ecg      = ADC(Pin(26))
lo_plus  = Pin(14, Pin.IN)
lo_minus = Pin(15, Pin.IN)

print("AD8232 ECG Demo")

while True:
    if lo_plus.value() or lo_minus.value():
        print(0)                        # leads off
    else:
        raw = ecg.read_u16()            # 0 - 65535
        print(raw >> 4)                 # scale down to 0 - 4095 (12-bit)
    time.sleep_ms(5)                    # ~200 Hz

# AD8232 ECG Module - ESP32 MicroPython Example
# OUTPUT -> GPIO 34 (ADC1_CH6), LO+ -> GPIO 33, LO- -> GPIO 32

from machine import ADC, Pin
import time

ecg = ADC(Pin(34))
ecg.atten(ADC.ATTN_11DB)      # read full 0 - 3.3V range
ecg.width(ADC.WIDTH_12BIT)    # 0 - 4095

lo_plus  = Pin(33, Pin.IN)
lo_minus = Pin(32, Pin.IN)

print("AD8232 ECG Demo")

while True:
    if lo_plus.value() or lo_minus.value():
        print(0)               # leads off
    else:
        print(ecg.read())      # 0 - 4095
    time.sleep_ms(5)           # ~200 Hz