Checking Battery Voltage, MicroPython

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I was trying to convert this code I grabbed from the Discord from Arduino C/C++ to MicroPython:

Quote
JasonTC — 03/22/2022
It is possible to check the battery voltage. The battery is connected on ADC0/GPIO26 to a voltage divider.

I don't have anything in MicroPython, but here's some Arduino C/C++ code someone else wrote:
float total = 0.0f;
const int numberSamples = 25;

for(int i=0; i<numberSamples; i++){
  float battVoltage = analogRead(A0);
  battVoltage = 2.0 * 3.3 * battVoltage / (4095.0);
  battVoltage = (int) (battVoltage * 100.0 + 0.5) / 100.0;
  total += battVoltage;
}

Serial.print("Battery: ");
Serial.println(total/numberSamples);

I'm trying to switch it over to MicroPython:
Code: [Select]
adc = ADC(26)
battVoltage = 1.0
numberSamples = 25

while(1):
    total = 0
    for int in range (0, numberSamples):
        thumby.display.fill(0)
        battVoltage = adc.read_u16()
        battVoltage = 2.0 * 3.3 * battVoltage / (4095.0)
        battVoltage = (battVoltage * 100.0 + 0.5) / 100.0
        total = battVoltage + total
        thumby.display.update()
       
    thumby.display.fill(0)
    thumby.display.drawText("Battery:", 1, 1, 1)
    thumby.display.drawText(str(total/numberSamples), 1, 11, 1)
    battVoltage = adc.read_u16()
    thumby.display.drawText(str(battVoltage), 1, 21, 1)
    thumby.display.update()   
    time.sleep(2)

I'm not exactly sure that the math translates from Arduino C/C++ code to MicroPython. I think the value from "battVoltage = adc.read_u16()"  might be throwing me off? I'm not sure exactly what is going on with the math. This is the first time I'm trying to interact with a pin too.  So I'm not sure if I'm 100% sure doing that right either :P
I've exhausted my google-fu.
If anyone has any info/advise on battery math or things I might be able to google to set me on the right path, that would be cool. :D


lennevia

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We plan to have an approximation of battery level at some point in the future. It won't be accurate enough for a percentage, but it will likely display a state:
Battery: low/medium/full
« Last Edit: April 05, 2022, 04:08:29 PM by lennevia »


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That's exciting to hear. It's always a bummer when it randomly just shuts down  ;D


 

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