Kfernando:
I need to sense a less than 0.1mA. How can I use INA219 to measure that? I have replaced the 0.1ohm resistor with 1ohm resistor. How do i calibrate the library for this? please reply.. huge help thanks
1ohm is 10x the value of 0.1ohm.
Just multiply the returned current from the INA by 10 (10.0), before printing it.
Leo..
felani:
What project are you working on use such a high voltage?dc or ac? are you using ext shunt? but you have too due to high Vbus, maybe you can try voltage divider apply before v+ & v-, (if you using ext shunt) monitor the Vshunt and play around with the coding to match with your output.
Hi,
I just discovered I can replace resistor on the ina219 breakout boards with a shunt of my own. But My solarpanels are 30 volts and 40 volts. What you say here suggests that voltage is reading optional? So I have the option not to read voltage and just connect the board in series and connect i2c and power the board I am good even when the voltage from the panel=40 volt?
I am using an ads1115 breakout board to read voltage at 15 bit so I do not need the voltage results from the ina219. I only need a reliable way to read current from 0.01 low to say 40 amps.
Are you getting those voltage by reading an open circuit, or are you reading them under normal load for the panels?
Paul
Paul_KD7HB:
Are you getting those voltage by reading an open circuit, or are you reading them under normal load for the panels?Paul
Well. I would like/plan to read them in closed circuit liek connectto to the charge controller and that is connected to the battery. but I imagine when the battries are charged the charge controller Might disconnect them. and that would be an open cicuit? It's a simple pwm controller. The oc = 46.1 and max closed voltage 38.6.
There is also the INA169, for a much higher shunt voltage.
No internal A/D and uni-directional (not a problem for solar).
You can use the ADS1115 with the INA169.
Leo..