servo triggered by a motion senor powered by 240v

Using Arduino Motors, Mechanics, Power and CNC
#1

Hello,

I am currently working on a project where I would like a servo to be triggered by a motion senor.

The mechanism will be used for relatively long periods, having it powered by 240v so it can be plugged into the wall would be ideal. I imagine I could use a PIR montion sensor that's wired to an Arduino board that then controls a servo. I also imagine it's a lot easier to write that last sentence than to achieve.

Essentially I want to be able to plug the project in, and then when someone walks past it activates the servo.

For the servo I would need the it to move a few kilos, and I would need to be able to adjust the speed of it for example fast in one direction and slowly for its return to the starting position. I would also like to be able to make the servo turn 360 degrees, it doesn't have to spin continuously, but I would like to have the ability to make it turn a full 360.

I haven't started building, so if anyone has ideas regarding if this is possible, and some insights that would be brilliant.

Thanks,

Tom

#2

Moving "a few kilos" is not your typical RC Servo. That would require a big motor or one of the really big and strong robotics servos.

A low voltage Passive Infra Red (PIR) sensor would be easier to interface to an Arduino. They are available from Adafruit, Sparkfun, eBay and all the Chinese outlets. Adafruit has a good tutorial. I have not played with the mains powered PIR sensors. I bet they could be used with rectifier and a level shifter or voltage limiting circuit.

#3