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Microprocessor Controlled Light Dimmer

with pushbutton control

Microprocessor Controlled Light Dimmer
Microprocessor Controlled Light Dimmer
This easy to construct light dimmer is controlled by a PIC controller and can handle a maximum current of 6 A. Three pushbuttons ensure extremely user-friendly operation.The light dimmer described here can be split into two parts. The light dimmer proper follows the familiar recipe. It is an analogue circuit, which uses a triac for phase control of the mains voltage. This is hardly a surprise. A little more striking is the fact that this dimmer circuit is not controlled with a simple potentiometer but with a programmed PIC16F84 processor. The processor is operated with the aid of three pushbuttons: a combined on/off button, an up and a down button.
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Materials

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

Component list

Resistors:
R1,R2,R12 = 33 k-ohm
R3 = 120 ohm
R4 = 2.7 k-ohm
R5,R13 = 470 k-ohm
R6 = 47 ohm
R7 = 330 ohm
R8 = 470 ohm
R9 = 39 ohm
R10 = 100 k-ohm 1 W
R11 = 10 k-ohm
Capacitors:
C1,C2 = 27 pF
C3 = 0.47µ F 400 V (Class X2)
C4 = 47 nF 400 V (Class X2)
C5 =10 nF 400 V (Class X2)
C6,C7= 100 nF
C8 = 22µ F 16 V radial
Semiconductors:
D1 = zener diode 9.1V 500mW
D2-D9 = 1N4007
T1,T2 = BC337
Tri1 = TIC226D
IC1 = PIC16F84-04, programmed, order code 000117-41
IC2 = MOC3021
IC3 = 7805
IC4 = 74HCT14
IC5 = 4N25
Miscellaneous:
S1,S2,S3 = pushbutton with make contact, safety Class 2
X1 =4 MHz quartz crystal
K1,K2 = 2-way PCB terminal block, lead pitch 7.5 mm
Case: e.g. Bopla (Conrad-Electronics order code 52 22 52-11)
PCB, order code 000117-1
Project disk (PIC source code files), order code 000117-11

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