Mr chapman Posted November 8, 2023 Share Posted November 8, 2023 Hello. My friend has tasked me with fitting a train tech level crossing. As per the instructions it can be wired to a sensor or an on off switch. My friend tells me the sensor is not cheap. I have fitted a push to make switch on his panel that controls the barrier lights but obviously you have to hold it down. I'm after a cheap little do-dad that will sit between the push to make and power supply so that when pushed it will run the circuit for a few seconds and turn off again. Something based around a 555 timer perhaps? It's been a while... And I don't know what is available these days. Any help would be wizard. Link to post Share on other sites More sharing options...
Nigelcliffe Posted November 8, 2023 Share Posted November 8, 2023 Clearly a 555 timer will do this, just search for a few examples of wiring arrangements. eg, this one-shot example: https://www.dummies.com/article/technology/electronics/general-electronics/electronics-components-555-timer-chip-in-monostable-one-shot-mode-179881/ There are numerous other devices which would do the same, including various things with Ardunio's and the like (but overkill for the job), and there may be ready-built circuits from Amazon/Ebay/China. Of course, if you have to buy some components, pay postage, faff with some prototyping, and a few hours doing it, it could be cheaper to just buy the manufacturer's detector. Whereas if you have a cabinet full of odds and sods of electronics parts and some spare time, it might be a fun thing to build. - Nigel 1 Link to post Share on other sites More sharing options...
RAF96 Posted November 8, 2023 Share Posted November 8, 2023 This is a cheap and simple timer, but he does have other devices that could do the task. https://www.bclstore.co.uk/product-page/one-shot-monostable-timer-variable-1-second-to-120-seconds?utm_campaign=1ef42407-cc25-4d1d-ba3c-6d99073c6815&utm_source=so&utm_medium=mail&cid=7c12c33d-01a7-4503-9fa9-51c3e8c6acdc Link to post Share on other sites More sharing options...
RMweb Gold 5BarVT Posted November 8, 2023 RMweb Gold Share Posted November 8, 2023 There is a MERG pocket money project that does what you want: https://www.merg.org.uk/download/chapter/27 Part 17 describes a signal timer operated from a LDR sensor. You could keep the sensor or replace it with your switch, and use the output to drive the traintech device instead of signal LEDs. Paul. 1 Link to post Share on other sites More sharing options...
RMweb Gold BluenGreyAnorak Posted November 8, 2023 RMweb Gold Share Posted November 8, 2023 I recently bought one of these for a little signalling project that looks like it will do what you want: https://www.ebay.co.uk/itm/295547998481?var=593620316953 Link to post Share on other sites More sharing options...
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