I'm trying to build a watering system with moisture sensors and a pump.
Following this build
I don't have the same transistor, and i have a different pump.
I tried to replace the transistor with "PNP Transistor(8550)". But the voltage when turned on was 4.5v, instead of 5v. So my pump does not have enough power. I have very little knowledge about how transistors work. What transistor do i need to keep arduinos 5v current? The pump works fine plugged directly to arduinos 5v pin
Would appreciate some help here!