Hello,
I've put together a basic circuit using a QT110 capacitive sensor (**broken link removed**). The output of the QT110 is connected to a small relay.
I've had a test setup running fine for a few days, using 4 AA batteries, respectively 6 volts. Now I'm trying to switch to a smaller 6 volt camera battery (**broken link removed**), and I'm running into problems.
When I connect the battery, the relays coil turns on (I can hear it click). When I touch the touch sensitive part of the QT110, the coil turns off, but it doesn't turn on again when I let go of the touch sensitive part. It switches on and off fine on the 4 AA batteries.
My first thought was the small 6 volt battery wouldn't have enough ampere to switch the relays on, but it does as soon as I plug it in to the circuit. It also switches fine when I connect it directly to the relays.
My second thought was it's a grounding issue with the capacitive sensor, but I'm not sure why it would work with the AA batteries then.
I'm basically out of clues. Any help would be greatly appreciated! The circuit is going into an exhibition in about two weeks, and would really like to use a small battery to fit it in an object.
All the best,
Harry
p.s. I'll try to post the schematics I used when I get to work today