SteamyTea Posted October 19, 2019 Share Posted October 19, 2019 2 hours ago, ProDave said: Thereafter you leave the receiver powered What happens if you don't. Link to comment Share on other sites More sharing options...
ProDave Posted October 19, 2019 Share Posted October 19, 2019 18 minutes ago, SteamyTea said: What happens if you don't. Then whatever you are trying to switch / indicate won't work. Link to comment Share on other sites More sharing options...
SteamyTea Posted October 19, 2019 Share Posted October 19, 2019 So the receiver looses the code set on the transmitter. Bit of a problem when sensing power, unless it has a relatively large back up battery. Link to comment Share on other sites More sharing options...
ProDave Posted October 19, 2019 Share Posted October 19, 2019 No it remembers the code, sorry if I did not make that clear. The point was the receiver has to remain powered when you are expecting the transmitter to activate and turn it on. Link to comment Share on other sites More sharing options...
Onoff Posted October 19, 2019 Share Posted October 19, 2019 6 hours ago, ProDave said: This is the transmitter unit I used https://www.ebay.co.uk/itm/433Mhz-Wireless-Transmitter-EV1527-Learning-Code-Encoded-for-Arduino-AVR/292030436727?hash=item43fe5ed577:g:QwkAAOSwB-1YpWii You simply choose a code with the jumpers, then when you apply 5V dc, it transmits. This is the receiver. https://www.ebay.co.uk/itm/1-Channel-Wireless-Relay-433MHz-RF-Remote-Control-Switch-Receiver-SRD-DC12V-10A/192470066162?hash=item2cd01c23f2:g:uJAAAOSwSfNal7~H This runs from a 12V dc supply. The first time you use it, you turn your transmitter on and then press the button on this module, that teaches it your chosen code. Thereafter you leave the receiver powered, and whenever your transmitter is turned on, this receiver module energises it's changeover relay that you can use to switch anything. There are plenty of other variations on this theme available. Bloody Hell that's a steal! I'd not looked at the actual links before. So the Tx can run off say a 9V battery as it's 5-12vdc? Turn it on with the NC contacts in the relay when mains is lost and it'll start transmitting. The house end...a 12V wall wart to power it? The pcb relay powering something this: https://www.ebay.co.uk/itm/2PCS-SFM-27-DC-3-24V-90DB-Intermittent-Beep-Alarm-Electronic-Buzzer-Sounder-FJ/143366277288?epid=0&hash=item21614bc8a8:g:GNUAAOSwSwNbTblp All very cheap and doable at this rate. Link to comment Share on other sites More sharing options...
ProDave Posted October 19, 2019 Share Posted October 19, 2019 Yes the price of some of these modules from China, it is not worth turning the soldering iron on to try and make your own. I have ordered a little 12V power supply to complete my project. Total cost of all parts still under £5 This is the 12V power supply I have ordered https://www.ebay.co.uk/itm/AC-DC-converter-power-supply-module-adapter-110V-220V-230V-to-12V-4RKUS/143262160732?hash=item215b17175c:g:ZAUAAOSwEB5c2nVv Link to comment Share on other sites More sharing options...
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