Step down voltage from 12V to 5V

the module did comes with a shunt resistor. maybe it use the shunt resistor and the 10k as a voltage divider and put out the output?

@JCA34F, all the resistor looks like 2k ohm, all of it. i don`t know how it works exactly it works but i might want to use it to control something when i pass different voltage

No, the bus voltage is measured between VIN- and ground. Are you sure your code is reading the bus voltage and not current?

I meant the physical size, like 1 Watt, 5 Watt,... ?

I don't see a INA219 module on the internet with two inputs like you show.
Are you sure it's INA219?
Please provide a link to the module you are using

the VIN+ is from the wheel and the VIN- connected to the 10k resistor then to ground. here are the link that you asked

@JCA34F, i still have no idea what it was used as before, it got 3 pin and i just checked it to have all the same 2k resistor for each resistor. maybe you were right, it was been used to control a fan, but i do not know the fan size. i found it from one of my dads stuff. maybe it were cool if i were able to control a fan using it.

Not with 2k resistors. :smile: Maybe a variable interval wiper switch?

Why not use a 15k / 10k voltage divider?

That will also work.
You need the resistor because the INA219 is measuring the voltage between VIN- and GND. Without a resistor, VIN- is just floating.
You can also connect the voltage between VIN- and GND, without the resistor.

it does works by using those resistor value. but im trying to figure out what other method i can use. maybe i will stick with ina219 as it use i2c and im also using other i2c sensor and display.

Good luck! :smile:

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@cookie95
You should connect the voltage between VIN- and GND.
If you use the 1K, it will essentially be placed in parallel with the wheel resistor and affect your all your readings.

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