This Python library supports the INA219 voltage, current and power monitor from Texas Instruments with a Raspberry Pi using the I2C bus. The intent of the library is to make it easy to use the quite complex functionality of this sensor.
first, thanks for the hard work on this library. second, I'm trying to use it with an ina219, which I think I have wired correctly but the results I'm seeing are a bit strange.
Here's my test code:
`#!/usr/bin/python3
from ina219 import INA219
ina = INA219(shunt_ohms=0.1,
max_expected_amps = 3.0,
address=0x40)
ina.configure(voltage_range=ina.RANGE_32V,
gain=ina.GAIN_AUTO,
bus_adc=ina.ADC_128SAMP,
shunt_adc=ina.ADC_128SAMP)
v = ina.voltage()
i = ina.current()
p = ina.power()
on the ina219 the brown wire is connected to VCC+ which is connected to the 20v DC+ from the power supply, the red wire on VCC- is connected to the load.
Attached are photos of the layout (maybe that will help?) Anyways, any ideas you have would be helpful. Thanks!
Hi Chris,
first, thanks for the hard work on this library. second, I'm trying to use it with an ina219, which I think I have wired correctly but the results I'm seeing are a bit strange.
Here's my test code:
`#!/usr/bin/python3 from ina219 import INA219
ina = INA219(shunt_ohms=0.1, max_expected_amps = 3.0, address=0x40)
ina.configure(voltage_range=ina.RANGE_32V, gain=ina.GAIN_AUTO, bus_adc=ina.ADC_128SAMP, shunt_adc=ina.ADC_128SAMP) v = ina.voltage() i = ina.current() p = ina.power()
print('{0:0.1f}V {1:0.1f}mA'.format(v, i)) print('{0:0.1f} Watts'.format(p/1000))`
with no load on it I'm seeing the following:
19.4V 0.0mA 0.0 Watts
Under load (which should be 20ish volts at 3amps I'm seeing: 0.0V -66.8mA 0.0 Watts
I have it wired as follows:
Red: reference ground to 20v DC ground Orange: 3.3v -> ina219 VCC pin Brown: ground to ina219 ground pin Blue: SDA -> ina219 SDA pin Yellow: SLC -> ina219 SLC pin
on the ina219 the brown wire is connected to VCC+ which is connected to the 20v DC+ from the power supply, the red wire on VCC- is connected to the load.
Attached are photos of the layout (maybe that will help?) Anyways, any ideas you have would be helpful. Thanks!
