Help with: cordless drill and infra red sensor

Other Hardware Motors, Mechanics, Power and CNC
1

Hello everyone!

(Excuse for possible bad English, I'm not a native speaker)

For a project I'm working on I want to make cordless drill that is switched on and off via a remote control and infra red sensor.
The problem is: I'm not very experienced with the arduino, so I would like some help.

I have coded the arduino so that I can switch the build in led on and off, but now I want to move on to the drill.
The drill has an 18V battery with it, which is connected to the motor through the push button mechanism.

The idea is to put a cable tie around the button so it will always stay on and then use the arduino as the switch. (Or maybe remove the switch out of the circuit at all?)

Now onto my quistion:
Since the battery is 18V and arduino only supports up to 5V, how do I put the arduino into the circuit? Would that require a resistor or even a transistor? If you could help me out, I would really appreciate that!

Thanks in advance!

2

You'll need a switching device such as a logic-level MOSFET - but first you need to establish how much
current the drill motor draws under full load - the switching device has to be able to handle
this much current without overloading or overheating.

You also should realise the trigger switch for a drill is a safety device first-and-foremost,
that cuts power to the motor if the user lets go - defeating this mechanism means you have
to think about safety issues yourself.