simple circuit

[ReesSkep]

I'm trying to do a prototype board using the toggle commands. Done it on a breadboard using axe029 into a 20m2. I'm using an audio detector from E-Bay which goes high at 3.0volts when active for 2 seconds. I am using four detectors in total. The problem is the circuit becomes what I believe to be very capacitive. Just touching a wire will set it off. Sometimes even a finger close to the circuit will do the same. The circuit in general, is very unstable and when the toggled pin goes high, it will then after a short time go low. Of course this pin should stay high until toggled again. Ive tried using a bypass capacitor on each output but that didn't help. Have a 104 cap across the 5v dc battery input. Can anyone help me on this ?. Thanks .

 

[AllyCat]

Hi,

Just touching a wire will set it off. Sometimes even a finger close to the circuit will do the same. ...

Welcome to the forum. That nearly always indicates a "missing" Pull-Down resistor on a/the very high input impedance CMOS input (which can float between a logic "0" and "1"). In the case of the AXE029 it might be a bad connection (e.g. a "dry joint") to the 10k resistor, or the earth connection in general, which can cause the PICaxe to randomly Reset/Restart (because it thinks it's received a Re-Programming command).

If it's not a Programming Input pin issue, then a link to the "ebay audio detector" might be helpful to us.

Cheers, Alan.