I got a flowmeter that is operating at 5v (basically an enclosed hall effect sensor and magnet). It needs a pullup resistor of between 1.6k - 2.2k between sig and vcc. ( https://www.conrad.com/p/bio-tech-ek-fch-m-pom-lc-g-18-flow-meter-fch-m-pom-lc-001-35-lmin-150391 )
Now, knowing that connecting a 5v device to the pis gpio that are using 3.3v, i would probably kill the pi.
I know you can put some resistors to step down the voltage to 3.3v, but I have no clue of how what resistors to use and how to connect them.
Could someone please help me telling me what resistors to use and how to connect them?
Thanks! :)