Sounds like loose connections. Try reseating components around the 555. But I'd like to focus on a single functional block at a time. Make sure the 4013 is working consistently as intended first.Don't really understand but the circuit had odd behavior for about 10 minutes then cleared up.
Started not responding to the button then when it finally tripped the relay I began timing how long it would take before I could manually turn it off. There was no pattern. Between 30-90 seconds. That went on for about 5 minutes then it suddenly started functioning as designed. With the following exception.
The input needs to be a positive going signal (low to high) to trigger the input circuit. If the input signal latches high, it wont trigger when the signal goes low. Thats the way it is designed. It will trigger the circuit when the signal goes high again, after going low.When the timer has expired the corresponding led goes out but the relay remains latched. Pressing the button then releases the relay.
The only thing I notice it works as a pulse or a latch but on latching it will not shut off upon un-latching. I can configure the touch switch to pulse but I have some switches that latch by means of a micro switch that is activated when the cupboard door is opened. Im going to scour the web looking for a solution.
Hmmm, seems 4.8v is low with a 5.5v supply.I checked the voltage at the "beginning" of the circuit. 5.5v i checked it at the relay 4.8v
Lets make sure the power supply is not "limiting" and starving the circuit of current.This is all so fascinating. Im excited to see this through. I had difficulty with my last project too. The BB version worked fine but the soldered up product would not work. I checked it over and over for a few days. Then all of a sudden I power it up and it worked. I made a second one and it did the very same thing. The just like the first one started working.
This morning I checked each leg on each chip. I traced all the jumpers. I powered it up. There was some hesitation getting it to work but it does function just as it did last night. I can manually operate it but if I let it time out the led at pin 10 goes out but the relay stays latched.
Some other things that might help pinpoint an issue. The buzzer only chirps for a millisecond and the led im using to visually show that the relay closed is dim. It has the same 150r resistor as the others. Food for thought.
Ok. I looked up the part number on the module. The specifications say it is an adjustable DC-DC converter. So the input you mentioned should be 12v DC (not a transformer I hope). A 12VDC wall wart will work. The output should be adjusted to 5.5 VDC. Did you make the output adjustment?A 12v transformer with a variable voltage reducer set to 5.5v