NewBie Question Setting up the 18X


New Member
Hi all,

Im just getting started with these things and all Im doing is trying to get an LED to flash on and off. I have the chip set up on a bread board. Im using a 12volt power supply and a 5v regulator so the entire project runs on 5v. However Im getting some odd operations.

My pin set up is as follows.
Pin 14 tied to 5V
Pin 5 tied to ground
Pin 3 tied to two resistors (10k,22K) and then to ground
Pin10 Flashes the LED (The led has a resistor)

So now when I power up the project sometimes it works find and sometimes it doesnt. The only way I can get it to work everytime is when I touch one of the 10K or 22K resistors with my finger, as soon as I let go it stops. I tried tying Pin 3 directly to ground with no resistors but that doesnt work either. It seems to me like the problem Im having has to do with the Pin 3 but Im not really sure how to fix it. Any help would be greatfull. I searched on the forums and found alot of conflicting answers so Im not really sure where to go.



Senior Member
Pin 4, the reset pin, needs to be tied to +5 through a 4k7 resistor. (That value isn't critical.)

Have fun!