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Applications of RF transmitters based on 2262-type chips (datasheet) are innumerable. You can find it in most remote controlled things on the market - toy cars, light switches. This one in particular came from a fog machine and was used to trigger it remotely.
Recently I needed a way to remotely tell a robot to start and stop doing a simple task, and this thing seemed a perfect solution for this - use Lock button to stop and Unlock to start.
RF transmitters and receivers come in several flavors, most commonly 315, 433, 868 and 915MHz. To determine which one I had, I had to crack it open:
Now we got to read it somehow... Luckily for me, you can buy receivers for any frequency in China by boatloads and dirt cheap. That's what I did!
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Except that when I tried to read the code for those buttons there was something unexpected in my terminal window...
2 buttons yield the same code |
Checking the layout, my suspicions that 2 buttons are just connected to the same input were confirmed:
That's how this works: any button pressed will connect 12V to the whole circuit: VCC pin and some address pins of 2262 IC and red LED thus sending one of 3^12 address codes possible.
What you need to make 2 buttons work is separate them and make each of them send 12V to different address pins and VCC.
Time to whip out your trusty scalpel 8-)
Aand that's the result:
You can see that in order to separately provide VCC to chip, I used 2 diodes.
Now I have a fully functional remote control:
Was it worth the hassle? Hell yeah, knowledge about how things work never hurt anyone. Hope someone will find this article at least educational, and maybe even practical!
Comments
please send layout file
ReplyDeletePlease provide me layout file or gerber file
ReplyDelete