I've had an arduino a short while and enjoyed experimenting with it making traffic lights and controlling a DC motor, but want to get on to making an actual project. I would like to build a drawing machine. something that holds a pen (or any mark making device pencil, paintbrush etc...) and moves this around the x & y axis and allows it to make a mark on a page on a tabletop. I have seen there are some tutorials and videos online for tabletop machines as well as ones that use gravity and a pen hanging from string. I am only interested in the tabletop version at the moment.
something a bit like this: http://www.youtube.com/watch?v=8k-LXopLEls
As far as I understand I would need three motors: 2 stepper motors to control x & y axis movements and another motor (servo?) to control pushing the pen down onto the paper. Is this correct or is there another solution for applying the pen to the paper? And would this be a suitable motorshield for this project:
It can control 4 DC motors or 2 stepper motors. It also says it can control 2 'hobby' servos, I'm not sure if that means you can also run 4 DC or 2 stepper as well as the 'hobby' servo motors. If not can I connect another motor to one of the unused ports on the arduino to control the pen applying to the paper? Or do I need another motorshield/approach entirely?
Any advice on the suitability of this motorshield, or another motorshield, or approach/technique, is greatly appreciated.