Hello everyone, I'm new here so hope this is the correct way to post a question,
I'm working on a project for my local modelling club to create a model version of the lights and sounds that appear when a UK railway crossing barrier is activated.
I have a delay circuit using a 555 timer which illuminates a amber LED for 6 seconds then turns it off and activates a second circuit that flashes 2 red leds alternately using another 555 timer circuit. (found both of them on here, including a diagram to connect them, thank you to the helpful person who posted them)
but my dilemma now is i need to add in another delay circuit in front of the first, that turns the entire circuit off after 15 seconds until it is triggered again by a passing train (will be optical sensor with a momentary on switch i think).
can anyone help with how to add a longer delay at the beginning of my circuit please? attached is the circuit I got from this site that I used to create my first delay and the alternate flash circuit.
cheers Kevin
I'm working on a project for my local modelling club to create a model version of the lights and sounds that appear when a UK railway crossing barrier is activated.
I have a delay circuit using a 555 timer which illuminates a amber LED for 6 seconds then turns it off and activates a second circuit that flashes 2 red leds alternately using another 555 timer circuit. (found both of them on here, including a diagram to connect them, thank you to the helpful person who posted them)
but my dilemma now is i need to add in another delay circuit in front of the first, that turns the entire circuit off after 15 seconds until it is triggered again by a passing train (will be optical sensor with a momentary on switch i think).
can anyone help with how to add a longer delay at the beginning of my circuit please? attached is the circuit I got from this site that I used to create my first delay and the alternate flash circuit.
cheers Kevin
Attachments
-
8.8 KB Views: 10
Last edited by a moderator: