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ECG_Monitor.py

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+""" Live-ECG monitor on ESP32 """
+
+import machine, ssd1306, time
+
+# Pins might differ depending on the board used
+pin16 = machine.Pin(16, machine.Pin.OUT)
+pin16.value(1)
+
+i2c = machine.SoftI2C(scl=machine.Pin(15), sda=machine.Pin(4))
+oled = ssd1306.SSD1306_I2C(128, 64, i2c)
+oled.fill(0)
+oled.show()
+
+
+ecg_out = machine.ADC(machine.Pin(37, machine.Pin.IN))
+ecg_out.atten(ecg_out.ATTN_11DB)
+ecg_out.width(ecg_out.WIDTH_9BIT)
+
+def rolling(x):
+    for i in range(0,64):
+        oled.pixel(x, i, 0)
+
+def hr_monitor(x):
+    x = x%128
+    y = int(ecg_out.read()/8) # norm signal to range in -1,1
+    oled.pixel(x, (-5+y), 1)
+    time.sleep(1/128)
+
+def main():
+    while True:
+        for x in range(0,128):
+            hr_monitor(x)
+            if x%21 == 0:
+                oled.show()
+        time.sleep(0.5)
+        oled.fill(0)
+        oled.show()
+
+if __name__ = "__main__":
+    main()
+