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Add function to measure Vbat with some simple filter (mean of n samples, 10 by default)

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Pierrick C 2018-08-02 00:11:57 +02:00
parent 37e77ebef6
commit 5665ccff52
1 changed files with 15 additions and 6 deletions
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21
circuitpython/main.py
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@ -68,15 +68,10 @@ class Data:
#Data from Feather board
self.data['SYS'] = {'time': {'val': datetime_format.format(*clock.datetime[0:6]),
'unit': '' },
'v_bat': {'val': vbat.value*0.000100708,
'v_bat': {'val': measure_vbat(),
'unit': 'V' },
'CPU_temp': {'val': microcontroller.cpu.temperature,
'unit': '°C' }}
# Note about v_bat calculation :
# 0.000100708 = 2*3.3/65536 with
# 2 : voltage is divided by 2
# 3.3 : Vref = 3.3V
# 65536 : 16bit ADC
#Data from BME280
self.data['BME280'] = {'temp': { 'val': round(bme280.temperature, 1), 'unit': '°C' },
@ -197,6 +192,20 @@ def set_clock_from_GPS():
clock.datetime = gps_datetime #Trust GPS if there is a bias
print("New date/time : " + datetime_format.format(*clock.datetime[0:6]))
def measure_vbat(samples=10, timestep=0.01):
"""Measure Vbattery as the mean of n samples with timestep second between
each measurement"""
# Note about v_bat calculation :
# 0.000100708 = 2*3.3/65536 with
# 2 : voltage is divided by 2
# 3.3 : Vref = 3.3V
# 65536 : 16bit ADC
v = 0
for i in range(samples):
v = v + vbat.value
time.sleep(timestep)
return v/samples*0.000100708
#########
# Setup #
#########