Hello everyone,
I have a transistor being switched by an ARM micro, this transistor is turning an infrared LED on and off.
My problem is, the LED is only bright enough to control a TV with it just 10cm from the IR receiver, any further and it doesn't work.
I'm powering the LED from 5v going through a 150ohm resistor. If I remove the resistor then the LED is bright enough to work from a distance of a few metres. I'm assuming the combination of PWM of the LED to send the IR code and the current limiting resistor is what's causing the LED to be so dim.
My question is, do I need the resistor? Everything works great without it.
Should I just reduce the value, maybe make it a 10ohm?
Thanks guys.
- Anthony