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Fix Inkplate 6 Color battery reading #21

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Fix Inkplate 6 Color battery reading #21

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3be5c02
feat: fix battery reading for Inkplate 6 Color
zachstence Feb 16, 2023
60b7f81
feat: add battery reading example for Inkplate 6 Color
zachstence Feb 16, 2023
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13 changes: 13 additions & 0 deletions Examples/Inkplate6COLOR/battery.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
from inkplate6_COLOR import Inkplate

display = Inkplate()

if __name__ == "__main__":
display.begin()
display.clearDisplay()

battery = str(display.readBattery())

display.setTextSize(2)
display.printText(100, 100, "batt: " + battery + "V")
display.display()
20 changes: 16 additions & 4 deletions inkplate6_COLOR.py
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,12 @@ def begin(self):

self.SD_ENABLE = gpioPin(self._PCAL6416A, 10, modeOUTPUT)

# Battery
self.V_BAT_MOS = gpioPin(self._PCAL6416A, 9, modeOUTPUT)
self.V_BAT = ADC(Pin(35))
self.V_BAT.atten(ADC.ATTN_11DB)
self.V_BAT.width(ADC.WIDTH_12BIT)

self.framebuf = bytearray(D_ROWS * D_COLS // 2)

self.GFX = GFX(
Expand Down Expand Up @@ -464,12 +470,18 @@ def printText(self, x, y, s, c=BLACK):

@classmethod
def readBattery(self):
self.VBAT_EN.value(0)
self.V_BAT_MOS.digitalWrite(1)
# Probably don't need to delay since Micropython is slow, but we do it anyway
time.sleep_ms(1)
value = self.VBAT.read()
self.VBAT_EN.value(1)
result = (value / 4095.0) * 1.1 * 3.548133892 * 2
raw_value = self.V_BAT.read()
self.V_BAT_MOS.digitalWrite(0)

# Calculate the voltage using the following formula
# 1.1V is internal ADC reference of ESP32
# 3.548133892 is 11dB in linear scale (Analog signal is attenuated by 11dB before ESP32 ADC input)
# Multiply by 2 for voltage divider circuit
result = (raw_value / 4095.0) * 1.1 * 3.548133892 * 2

return result

@classmethod
Expand Down