it would be cool to be able to just take apart a calculater, an old printer or tv and have enough knoledge to turn its parts into a funtional robot. But maybe you can!! And im about to show you how, all you need are:
* some intermediate electrical engeneering knoledge, curcuits etc.
* a multimeter (an advanced electricity meter for curcuits)
* old tv,printer,electrical toy like spy gear etc.
* batterys or power for multimeter and device tv, etc.
ok so you have found all these parts, now turn on the device by puting in battery's.
Now use the current funtion for the multimeter and check all the pins or wires on the device to see what they do and when there high or low. Maybe if there is a thing where something does something ocording on a button or sensor on printer or if two things happen
then a certain wire turns high play around with this and rember safty, because electricity can be dangerous regardless that most multimeters have fuses, make sure you have your multimeter set to the right setting a that your devise is not one thats plugged in which can be dangerous because of high voltage.