Learning RC5 Control Decorder

build a low-cost remote volume control

The unit described is intended to be used with any Philips RC5 remote control to enable up/down remote control of a motor driven potentiometer.A special feature of the design is that it is truly universal in that it can be programmed to respond to any two specific keys on any Philips RC5 compatible remote control.This is achieved simply by shorting two pins on the unit during power-up. The unit will then indicate PROG mode by flashing the relevant LEDs, and learn the system address and volume UP/DOWN commands as they are pressed on the chosen remote control. The resulting information is stored in non-volatile memory for retention after power-down.

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Materials

000081-PCB.pdf

000081-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Download Gerber file: 000081-1.zip

Component list

Resistors:
R1,R2,R3 = 1 k-ohm
R4,R6,R8-R11 = 100 k-ohm
R5 = 10 ohm
R7 = 100 ohm
Capacitors:
C1,C4,C6,C7 = 100nF
C2,C3,C5 = 22µ F 16V radial
Semiconductors:
D1,D2,D3 = low current LED
IC1 = AT90S2343-10PC, Publishers order code: 000081-41
IC2 = L272M
Miscellaneous:
JP1 = 2-pin pinheader with jumper.
K1 = 10-way SIL pin header for board edge mounting.
IC3 (not on board) 36 kHz centre frequency IR receiver/demodulator, e.g., IS1U60 (Sharp) SFH506-36, SFH5110-36, SFH5110 (Siemens).
PCB, Publishers order code 000081-1.
Disk, project source code and Hex file, order code 000081-11