Hi, I'm a novice in Arduino development and I have a DC motor that I want to make it work in reverse (so powering it by a negative voltage). Can someone just say to me how to do it ? What changes do I have to do on montage/program ?
Please answer asap, thank you
You need an h-bridge like this one for example. But you need to choose one with the right voltage and current capabilities:
To clarify you don't need a negative voltage(*) to drive a motor in reverse, just a reversal in polarity at the terminals which is what an H-bridge does.
(*) in the sense of more negative than ground.
You could use a simple change over relay to reverse the connections to your motor. You can then turn the relay on and off with on output from your Arduino.
NOSUM:
You could use a simple change over relay to reverse the connections to your motor. You can then turn the relay on and off with on output from your Arduino.
But you'd need a second relay to switch the motor off - so that's two relays and some transistors/diodes - an
H-bridge chip can be simpler (depending on the voltage and current involved).