wizpic
Advanced Member level 3
Hi all
I have a little simple project to control a motor controller which receives a 0-5v signal in to control the speed, If I try to drive it direct from the micro controller the voltage drops slightly or I don't achieve the max volts out
so I thought I'd add a transistor to increase the drive current and add an LED to indicate the voltage by the brightness of it, In the drawing attached is my set up when there is no LED connected I get 0 to 5v out but when I connect the LED I only get a max of 1.8Volts. I may have it completely set up wrong tried some other ways but cant quite get to the bottom of it the more I try the more it gets worse (over trying to find a simple solution.)
Is the drawing correct or the values wrong ??
I have a little simple project to control a motor controller which receives a 0-5v signal in to control the speed, If I try to drive it direct from the micro controller the voltage drops slightly or I don't achieve the max volts out
so I thought I'd add a transistor to increase the drive current and add an LED to indicate the voltage by the brightness of it, In the drawing attached is my set up when there is no LED connected I get 0 to 5v out but when I connect the LED I only get a max of 1.8Volts. I may have it completely set up wrong tried some other ways but cant quite get to the bottom of it the more I try the more it gets worse (over trying to find a simple solution.)
Is the drawing correct or the values wrong ??