4 to 20mA Current Source using PWM

Projects General Guidance
1

Sup Guys

Im new to the the arduino world and was wondering if you can help me out.

Im building a 4 - 20mA Current source using the arduino uno board. The signal to my Current Source conversion circuit should be a 1 - 5v PWM signal from the microcontroller but I dont know how to get this input signal from the microcontroller. Can some1 plz show me how I would get this?

thanks

2

Are you sure it is 1-5V and not 0-5V? The 0-5V would be easy, just connect to any PWM pin and use analogWrite().

Perhaps you should specify the part number of the converter you are using or, better yet, provide a link to the datasheet.

3

thanks, the 0 - 5v is easy.

its the concept I didint understsnd. I was thinking 1 - 5v because I thought 1v = 4ma, 2v = 8ma and so on.

4

1-5 volts is just as easy. If your circuit converts 5V to 20mA then 1V equals 4mA.