IR switch with PWM

• Dimensions: 25x23mm (a bit smaller than 1in squared)
• Made for 12V DC
• Low standby power
• Switch current: 5A, more with heatsink
• For resistive loads (LEDs) only
• PWM capable for brightness control
• 38kHz IR receiver
• Can be 'taught' any IR code - requires firmware recompilation
• Firmware includes a 'scan' mode to capture any IR code and send data to a computer

You can find it on tindie.com

The IR-codes used in the demo-code were derived from a small and cheap IR remote (NEC protocol) that is currently available at Adafruit.

The output of the captured data looks like this:

#define ir_code_1 {\                                                                             
801,\                                                                                            
214,\                                                                                            
50,\                                                                                             
[...some more data...]                                                                                            
0}\

1) Transfer to 'IR_codes.h' and set a unique name instead of 'ir_code_1', e.g. new_code.

2) Add that unique name to

#define NUMBER_OF_IR_CODES 5    // does not include the repeat-code, which I don't consider as a "full" code.

const uint16_t PROGMEM IRsignals[NUMBER_OF_IR_CODES][NUMPULSES] = {
    vol_up,
    vol_down,
    arrow_up,
    arrow_down,
    new_code};

3) Update 'IR_receiver.hpp'

// all elements EXCEPT (REPEAT_CODE, MISMATCH and NOT_SURE_YET) must be in the same
// order (if present at all) as in the PROGMEM array IRsignals! These 3 special elements
// must ALWAYS be there.
typedef enum {
    VOL_UP,
    VOL_DOWN,
    ARROW_UP,
    ARROW_DOWN,
    NEW_CODE,
    // DO NOT EDIT THESE LAST 3!
    REPEAT_CODE = 66,
    MISMATCH = 77,        // only returned if something goes terribly wrong
    NOT_SURE_YET = 99    // this should NEVER be returned as a result
} IR_code_t;

4) Recompile the firmware. I use Code::Blocks, but there's also a simple 'compile.sh' script.

5) Reprogram the ATtiny85.

Check for new IR data with 'IR_available()', retrieve the received IR code with 'eval_IR_code()'. Once you have the identifier of that code in a varialbe, just use a switch-statement to process. The demo-code does just that. That way you can easily identify and use IR-remote buttons by name and write human-readable code.

To have a look behind the scenes, uncomment '//#define DEBUG' in 'IR_receiver.hpp' and the board will print measured vs. stored data until it finds a match.

If you get too many false readings, try playing with the FUZZINESS number. Higher values allow for more deviation from the stored reference.

Use the onboard LED (connected to SCK) as an indicator that IR data is being received or recognized. It will also blink when sending out serial data.

12V LED strip controller, remote switch for Halloween props (yes, a bit late...)