hello I'm working on monitoring a 12v power supply for current on how much this pump actually takes. the Power supply for the pump is 12v 4.5a. Sense i do not know much about current sensors I do have a couple of ina219 that say they can go up to 26v But not sure about the current on how much they can handle. can someone please help me out on this?
What i mean is what am i missing to measure up to the close to 5amps to make sure I'm okay?
Google on ina219.
Hi,
Do you have the INA219 IC or the breakout PCB assembly?
Tom... 
Hello Tom the one i got is from eBay Here. It says it can do up to 3.2a but i have seached the same one that can go higher up to like 30a. But not sure what is the difference?
Hi,
The difference in current measurement will be the shunt resistor on the PCB, the link you sent has a black R100 shunt resistor on it, R100 means the resistor is 0.1Ohms.
The INA219 measures the voltage dropped across that resistor and uses Ohms Law to calculate the current flowing through it.
So a differently calibrated assembly will have a different value shunt resistor.
The 26V limit is if you are using the PCB in the positive wire to the load and reading the positive voltage as well as current, the positive voltage must be below 26V.
Tom...
PS. The 5 units I ordered turned up today, 3.2A units as well.
