The Yam remote control switches seem to be very common on eBay and are surprisingly cheap for what you get. The insides seem relatively acceptable give or take a bit of poor track clearance between mains connections.
The circuitry is pretty much text-book for the application with a small microcontroller doing the decoding and relay control while a discrete RF receiver module based on an LM358 converts the received signal to a level the processor can deal with.
Here's a general eBay search link for this type of unit, but note that most are intended for 220-240V use.
http://www.ebay.com/sch/i.html?_odkw=wireless+lamp+remote+control&_sop=15&LH_BIN=1&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR4.TRC2.A0.H0.Xwireless+lamp+remote+control+receiver.TRS0&_nkw=wireless+lamp+remote+control+receiver&_sacat=0
The circuitry looks like it could be hacked to power it from an external 12V DC supply quite easily as long as it is not an electrically noisy supply.
The unit is only really intended for low current loads like light fittings, but again is open to technical modification with things like external solid state relays. (Treat low voltage side as being live at full mains voltage.)
I'm not sure if there is different coding between units. So I've just ordered a couple more to find out.....
If you enjoy the videos on this channel you can help support it with a dollar for coffee, cookies and random electronic modules at https://www.patreon.com/bigclive
The circuitry is pretty much text-book for the application with a small microcontroller doing the decoding and relay control while a discrete RF receiver module based on an LM358 converts the received signal to a level the processor can deal with.
Here's a general eBay search link for this type of unit, but note that most are intended for 220-240V use.
http://www.ebay.com/sch/i.html?_odkw=wireless+lamp+remote+control&_sop=15&LH_BIN=1&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR4.TRC2.A0.H0.Xwireless+lamp+remote+control+receiver.TRS0&_nkw=wireless+lamp+remote+control+receiver&_sacat=0
The circuitry looks like it could be hacked to power it from an external 12V DC supply quite easily as long as it is not an electrically noisy supply.
The unit is only really intended for low current loads like light fittings, but again is open to technical modification with things like external solid state relays. (Treat low voltage side as being live at full mains voltage.)
I'm not sure if there is different coding between units. So I've just ordered a couple more to find out.....
If you enjoy the videos on this channel you can help support it with a dollar for coffee, cookies and random electronic modules at https://www.patreon.com/bigclive
Hi there! Is it possible to clone the remote from the set so that it can also be used with an additional remote control? Is it a rolling code or a special fixed code? Thank you
Hi Clive I've just obtained the latest latest version of this device the YAM-803. Almost all the components are now surface-mount types. When I first tested it I was alarmed to find that it consumes about 27W (@245v) on standby! Changing C1 to 680nF (0.68uF) reduces the consumption to about 12.3W and everything works as intended. I finally settled on supplying the DC 12volts via a separate switch mode power supply, of course omitting C1. I simply connected the 12v to the 0.0v and the +ve to one of the 680 ohm resistors, there was no need to disconnect the 12v zenners.. Standby is now just under 1/2 W. As this module is mainly designed for remote controlled lighting circuits, channel 1 is designed to default to ON after a power cut.
Can't believe I stumbled on this. I bought a "traffic light" from aliexpress which had this controller inside. When you turn the power on and off, it will cycle through 1 relay each start.
So, when you turn off and on, green light. Off and on again, yellow…. so on. How cool!
Could you tell me what its RF Frequency 433 mhz or 315 mhz ?
what's the rf frequency?
Hello Clive, it might be fun to look at the signal from the RF module to the microcontroller on an oscilloscope.
My unit failed after 5.5 years. The article made diagnosis and repair a " walk in the park." Great little gadget
Nice work 🙂 Cheers
Why waste time showing these products.. i have three if these installed.
They are absolute rubbish.
Unreliable in operation, interference generators.
Typical cheap chinese junk.
I'm trying to find a replacement remote for my light fitting which obviously has something like this built in. My remote is 433.92MHz frequency – is it likely to be uniquely coded to my light fitting or can I just buy a generic replacement?
Can you please share the link for the bench tester as I am unable to find the same
I have one of these that worked until I had to turn mains off and on.Anyone know how to reset the control do the remote will pair with the light? Thanks
I presume the contacts aren’t clean but switching 240v live supply?