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chrisb2 / pyb_ina219

This library for MicroPython makes it easy to leverage the complex functionality of the Texas Instruments INA219 sensor to measure voltage, current and power.
MIT License
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Shunt resistor value #4

Closed csebe12 closed 3 years ago

csebe12 commented 4 years ago

Hi,

I'm using this library with the Gravity I2C digital wattmeter which uses the INA219 sensor. According to the schematic the value of the shunt resistor is 0.01 Ohm not 0.1 Ohm. Could you please look into this and correct your example if necessary?

Thanks, Ben

chrisb2 commented 4 years ago

The more common Adafruit ina219 board has a 0.1 Ohm resistor, I am guessing on that gravity board they wanted to measure smaller currents and so reduce the shunt to 0.01 Ohm. Given the popularity of adafruit sensor I am going to leave the value at 0.1 Ohm, but I will update the example to warn people to check their board.

regards, Chris