Nice little 12V remote control receiver

I'm not surprised the kinetic transmitter doesn't work. I designed a wireless control system a few years back & the MD of the company insisted I use Enocean low-energy modules (he had seen at a trade show) in place of the Telit/Zigbee etc. I was used to. Enocean were quite early in the battery-less space, using kinetic switches, solar cells, Seebeck generators etc. in their (expensive) transmitters. According to blurb on their website, they had to develop a special, new protocol using very short packets with esoteric error correction to meet the demands for very low power. I imagine these mass-market devices will have had to follow a similar path..

Gordo

I got some similar modules on aliexpress. Bring your own box as they are just the bare boards. They are even more tiny as they use a mosfet rather than a relay. Works on 3.6v to 24v it claims, although I imagine 24v would toast the regulator before too long, but perfect for usb powered lights. Fitted nicely in a base of an led neon flamingo.

Denis Looby

Try an eBay search for 12V 433MHz (or whatever frequency is normal locally).

Big Clive

see e.g., http://ww1.microchip.com/downloads/en/DeviceDoc/micrf219.pdf "The crystal frequency is calculated by REFOSC=RF Carrier/(32+1.1/12)). The local oscillator is low-side injection… that is, the frequency is below the RF carrier frequency[…] See Figure 7."

Does anyone have a link for buying this?

Thanks Clive, nice video, some of the similar devices on Ebay show the chip as an SA921V, I haven't gone looking for it though.

Rob Googe

That's really common. The ultra low capacity cells are very light.

Big Clive

One of favorite Raspberry Pi applications is using it learn and send 433 Mhz remote codes. theres a python app called rpi-rf that uses rf modules to identify and recreate most rf data. Obviously not as easy as a cheap uiversal remote but way more powerful since its unlimited in the conditions which devices are controlled. I fell short of my goal to also determine on/off states of devices.

Jim

I just opened a cheap NiMh AA cell with 200mAh (!) that was included in some garden lights. There was a plastic spacer so they did not need to fill it fully. I can't believe someone actually engineered that to lower the capacity and the cost. 🤣

just_noXi

So glad you explained the programming for these. I have bought several, and either they came preprogramed the way i needed, or i fumbled around and got it to work by sheer luck.

Paul Malloy

They're very functional. Not much to go wrong.

Big Clive

It's a metric CSA of 0.6mm, so theoretically about 18AWG? https://www.rapidonline.com/equipment-hookup-wires?&Attributes={%22Conductor%20Stranding%22:[%221%2F0.6mm%22]}

Big Clive

No. I accidentally called it the Kink Palculator once and decided to go with it.

Big Clive

Has it always been called the “kink palculator”?

Matt Hessinger

You have a bit of a fetish for flashing lamps Michael 😄, your designs are very smart, do you sell the lamps when you have completed them?

The Tinkering Shed

They don't all work exactly alike, we use the Larco Ultrasmall, it's 433mhz but it will only recognise Larco rolling codes, most of the other mainstream manufacturers use the same method, it forces you to buy their replacement remotes or recievers when one item fails. We use them on door operators for DDA access, mainly for people with mobility needs. The cheaper chinesium units will take *most* codes as long as the frequency matches.

The Tinkering Shed

Is there a standard protocol for these things?

Raven Luni

There are also clones of this design, eg https://datasheet.lcsc.com/szlcsc/2012211239_VIBRATION-VI590R_C968713.pdf mentions this specific crystal value (pinout looks very similar to RF83)

JD

The pinout resembles RF83C decoder, it can run in 433MHz (https://datasheet.lcsc.com/szlcsc/HopeRF-Micro-electronics-RF83L_C132240.pdf - see sample schematic on page 3). Pin 6 should connect to ground in this case as well

JD

I have the dumber version (the one the silk screen is meant for) switching the diesel engine heater in my pickup, 5 yrs now never had a problem with, same tiny box though.

Coil B

Hi Clive just a quick question , what is the AWG of the solid core wire you use for your led lamp projects like the snow drop lamp . thank you chris

Does that lamp have a "Flash" function? Oh?

Michael Thompson