i am interfacing push buttons and leds to avr in such a way that when the button is pressed the led also glows.. now the point is that i want it to glow by itself and not by mcu ... check the circuit ...attached..
when i used the same circuit during testing using 5mm LEDs the system worked.. a valid zero was avaible on pin of mcu, but hwen i made some prototype boards using SMD LEDs the PIN doesnt get valid zero, i checked the Voltage across the LED when it was on and that was 2.1 V ... what i can i do to make it valid one...
![84_1286179499.png](/forums/proxy.php?image=http%3A%2F%2Fimages.elektroda.net%2F84_1286179499.png&hash=e954079f33fccd2b9019e00fff7b183e)
when i used the same circuit during testing using 5mm LEDs the system worked.. a valid zero was avaible on pin of mcu, but hwen i made some prototype boards using SMD LEDs the PIN doesnt get valid zero, i checked the Voltage across the LED when it was on and that was 2.1 V ... what i can i do to make it valid one...