I have a couple of these https://www.sparkfun.com/products/10213 MOSFETs I use an arduino to generate the 0-5 volt PWM signal and use 12 volts through it to power a 1 amp motor. What exactly would happen if I didn't use the Arduino an put an input of 0-12 volts on the signal line of the MOSFET? Would the MOSFET Just max out the output voltage when the signal voltage reaches 5 volts or will this damage the MOSFET?
I am trying to do a demonstration in which energy from ambient radio waves (it doesn't matter which frequency) is used to charge up capacitors and blink a red 3 volt 1 mA led every 10 seconds or so. Is this feasible? If so how can I go about building it.
I have a micro sized robot and need a radio for it that will allow 1 way communication from a PC or joystick of some sort to the robot. I just need it to send enough information to tell the robot to stop, go forward, go backwards, turn left, and turn right. I am looking for a transmitter that is small and high powered as well as cheap. I don't need much bandwidth a message to the robot about every half second is sufficient.
As far as i know the track ball would have encoders since it can keep rotating. The game controller's thumb stick has 2 potentiometers. if you want the arduino to control the game controllers thumb stick directly you will have to use a digital potentiometer from the arduino to the thumb sticks potentiometers. the track ball's encoder would then be read from your arduino
Is it possible to have the arduino interface to a standard USB scanner? I don't mean have it connect by USB but rather remove the imaging sensor from the scanner and plug that directly into the arduino.
Do use 470 Ohm to 1 K Ohm resistors between the two as a best practice.
What! Why! You would not normally connect to digital chips (which use the same votage) using a resistor.
I have had this issue before how. I had one arduino on and the other powered off. with the digital pins connected directly the 1 Arduino tried to power the other Arduino which was off through the I/O pins. I always thought you had to use resistors to limit this. what method is better?