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esp32/boards: Fix VBAT voltage calculation for UM S3 boards. 

Signed-off-by: Seon Rozenblum <seon@unexpectedmaker.com>
This commit is contained in:
Seon Rozenblum 2023-09-27 20:38:35 +10:00 committed by Damien George
parent 276bfa3146
commit 77ae0a0948
3 changed files with 6 additions and 3 deletions
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3
ports/esp32/boards/UM_FEATHERS3/modules/feathers3.py
View File

@ -65,8 +65,9 @@ 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)

3
ports/esp32/boards/UM_PROS3/modules/pros3.py
View File

@ -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)

3
ports/esp32/boards/UM_TINYS3/modules/tinys3.py
View File

@ -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)