Sorry for stupid question, but I'm googleing all day and trying to figure out what is going on. I have two pins as input_pullup and when i put my hand near wires they trigger like they got low. I even put 10k res on each for external pullup. Didn't help. I don't have oscilloscope and i can't debug like I would like. If anyone have any idea i would appriciate it very much.
That is happening while atmega is on a board I developed. It is powered from 7805. On uno inputs are working fine.
This is schematic without external pullups. I getto soldered them now.
This is part of project for opening car enterance with remote. I have done one for my doors and it is working flawlessly. This is one for my uncle and I can't get it to work like it should. Only diffrence is that I have DC motor and he have 230V/50HZ motor made for moving doors.
I have put all that delays because it is working little better when it takes some time. I want to fix it and remove them
I have two pins as input_pullup and when i put my hand near wires they trigger like they got low. I even put 10k res on each for external pullup. Didn't help.
Well that is strange. There is no way that can happen normally. Therefore there must be something else wrong.
That is happening while atmega is on a board I developed.
Have you got acquitted decoupling on the chips? That would be a 0.1uF ceramic on both the Vcc pins of the processor and either side of the regulator along with a larger cap on the regulator?
Are you sure there is no other signal on those wires? Is your circuit wired up like your schematic?
You say powered by a 7805. But what is providing power?
If the system ground (ie, common) of the Arduino circuit is not grounded through the power supply, then the power supply's output might be floating at 1/2 of line voltage. So your finger acts as a grounded conductor and the Arduino "sees" an AC line frequency voltage.
I'm using some 72W 230VAC->12VDC power supply from ebay. Outputs of that are connected as gnd and +12 of board. I removed decoupling caps as they were getto soldered and in my way for external pullup resistors. They didn't help. I will again build everything on breadboard and try there. If it works there then it must be something on board. Maybe that thing that makes soldering easier connected two lines or something like that. I don't know how to remove it. It is like seetrough cream on board when it melts. It is very old stuff
I want to inform you all that I have found a solution. Problem was that on that crappy switching power supply earth was not connected. I usually use them without earth and they work but it seems that was causing trouble this time. So I have connected the earth pin and everything is working. I'm going to desolder getto external pullup resistors and resolder decoupling caps.. Thank you all for your help guys. I really enjoy this great community
