My original problem was discussed in https://forum.allaboutcircuits.com/threads/calculating-base-resistor-for-darlington.152509/
I’ve since gone to using Logic Level n-channel Mosfets. I’m using 2N7000 to switch the low side and that is working.
It is the high side switching that I am having trouble with. I purchased some 5 amp Logic Level n-channel Mosfets, to switch 12V at 1.05A. Gate goes to the (Arduino) digital pin. This pin switches between 0V and 5.05V. Source goes to load. Drain goes to +12V.
When the digital pin changes states, source alternates between 0V and 3.43V. NOT 12V.
I added is a 100k resister between the gate and ground, but there is no change in the results.
Why only 3.43V? Am I doing something wrong?
I’ve since gone to using Logic Level n-channel Mosfets. I’m using 2N7000 to switch the low side and that is working.
It is the high side switching that I am having trouble with. I purchased some 5 amp Logic Level n-channel Mosfets, to switch 12V at 1.05A. Gate goes to the (Arduino) digital pin. This pin switches between 0V and 5.05V. Source goes to load. Drain goes to +12V.
When the digital pin changes states, source alternates between 0V and 3.43V. NOT 12V.
I added is a 100k resister between the gate and ground, but there is no change in the results.
Why only 3.43V? Am I doing something wrong?