Hello everyone, I am new to this, in the forum and in the world of electronics and I need help, I am doing my final electronics project, and this is the circuit that the teacher asked us to do, the light bulb should turn on by the arduino (the code will be given to us by the teacher), but through calculations I need to get the resistance R1 and R2, someone who can help me? I have no idea, ask on chegg but it asks me for the threshold voltage, I don't know how to get that