I have an electric gate and control and have hard wired it into my house programmed to a momentary push button for open and close. I want to set this up on an automatic timer to open the gate at a specific time and close at a specific time. The momentary function is critical as if I hold the button too long, the gate will cycle again. all I need is a timer controlled by seconds to break and make the circuitry for this to work. I have purchased many timers and cannot find the one that does this job effectively. any help or suggestions will be welcome.
Thanks
34ford454

 

hi ford.
I guess you have considered the 555 timer, set as a Monostable, to give a fixed one shot period.??

E

 

Yes like Eric says, the first thing that comes to my mind is to use a standard timer that turns lights on and off. Use the AC power from the timer to activate a relay that triggers a 555 timer. The 555 activates another relay for a short duration to replace the momentary pushbutton. There are other ways of doing this but I'm suggesting relays to isolate the AC for safety and not care about the voltage across the pushbutton.

 

Try a 555 Timer pcb like this....


https://www.ebay.co.uk/itm/NE555-DC...923140&hash=item442d26258a:g:OJ8AAOSwF8Fb6nyq

 

If you are looking for something a bit more industrial there are plenty of "timer relay" modules about also:
https://www.aliexpress.com/af/timer...relay&catId=0&initiative_id=SB_20191218015840
These will typically stay on for a preset time once activated before releasing.

 

thanks for the information. I will order a 555 timer.

 

Try a 555 Timer pcb like this....
https://www.ebay.co.uk/itm/NE555-DC...923140&hash=item442d26258a:g:OJ8AAOSwF8Fb6nyq

The description of that says it generates a time delay.
Not clear if it can do a one-shot without modifying the circuit board.

 

Here is a simple monostable from a relay, wall wart, and a standard 120VAC timer. Relay contacts in parallel with your pushbutton. Adjust the value of the capacitor for a particular relay to set the ON time.

Ken