diff options
Diffstat (limited to 'ports/esp32/boards/UM_PROS3/modules/pros3.py')
| -rw-r--r-- | ports/esp32/boards/UM_PROS3/modules/pros3.py | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/ports/esp32/boards/UM_PROS3/modules/pros3.py b/ports/esp32/boards/UM_PROS3/modules/pros3.py index 7f95902936..4e5b2e9656 100644 --- a/ports/esp32/boards/UM_PROS3/modules/pros3.py +++ b/ports/esp32/boards/UM_PROS3/modules/pros3.py @@ -41,8 +41,9 @@ def get_battery_voltage(): This is an approximation only, but useful to detect if the charge state of the battery is getting low. """ adc = ADC(Pin(VBAT_SENSE)) # Assign the ADC pin to read + adc.atten(ADC.ATTN_2_5DB) # Needs 2.5DB attenuation for max voltage of 1.116V w/batt of 4.2V measuredvbat = adc.read() - measuredvbat /= 4095 # divide by 4095 as we are using the default ADC attenuation of 0dB + measuredvbat /= 3657 # Divide by 3657 as we are using 2.5dB attenuation, which is max input of 1.25V = 4095 counts measuredvbat *= 4.2 # Multiply by 4.2V, our max charge voltage for a 1S LiPo return round(measuredvbat, 2) |