About the article

IR Multi-Position Switch

IR Multi-Position Switch
This multi-position switch is operated by the IR transmitter with HT12R described elsewhere in the issue.The signal transmitted by the transmitter enters the circuit through infrared detector IC4. At the output the demodulated signal is available, that via R2 and T1 is routed to the input of IC1 (decoder type HT12D). Like the encoder IC, this IC has already been described in Elektor Electronics on multiple occasions and we will therefore not describe it again here. On the PCB the address lines of IC1 are by default connected with a thin trace to ground. The default address is therefore zero. By cutting the trace with a sharp knife the corresponding address input can be made logic high.This change of address is only necessary if multiple transmitters are active in the same house.
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1 = 47Ohm
R2,R3,R6 = 100kOhm
R4 = 51kOhm 1
R5 = 1kOhm 5
R7-10 = 10kOhm
C1 = 220µ F 16V radial
C2 = 100nF
C3 = 47µ F 10V radial
C4 = 1µ F 10V radial
D1,D2,D3 = 1N4148
D4 = LED, red, high-efficiency
T1 = BC557
T2,T2 = BC547B
IC1 = HT12D (Holtek)
IC2 = 78L05
IC3 = 4017
IC4 = SFH506-40 or equivalent
Re1,Re2 = 12-V relay, e.g., Siemens V23057-B0002-A101
K1,K2 = 2-way PCB terminal block, lead pitch 7.5mm
PCB, available from The PCBShop
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