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Home › Magazines › 2005 › July › PIC PWM Controller

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PIC PWM Controller

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Published in issue 345, July 2005

PIC PWM Controller
An efficient and economical method to control the power into a load (for example the speed of a motor or the temperature of a heating element) is to use PWM (Pulse Width Modulation). But things are a little bit more involved of we want an accurate adjustment from 0 to 100 % and an indication of the power.
A little 8-pin microcontroller can do these tasks easily: generating a PWM signal and indicating the power via a 4017.

Components

Relevant websites

Free downloads

Relevant products

Resistors:

R1 = 100k

R2,R3 = 4k7

R4 = 220

Capacitors:

C1 = 2200µF 25V

C2 = 10µF 25V

C3-C6 = 100nF

Semiconductors:

D1 = 1N5408

D2 = 1N4148

D3-D7 = LED, 3mm, green

D8-D12 = LED, 3mm, red

T1 = IRFZ34N

T2 = BS170

IC1 = 78L05

IC2 = PIC 12C508-I/P

IC3 = CD 4017

Miscellaneous:

K1,K2 = 2-way PCB terminal block, lead pitch 5mm

S1,S2 = pushbutton, 1 make contact, DTS6

F1 = 2 AT (time lag) fuse with PCB mount holder

Heatsink type SK104 (Fischer)

PCB, ref. 050056-1

PIC source and hex code, ref. 050056-11

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 
PDF Article (050056-UK.pdf)
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PCB layout (050056-PCB.pdf)
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Order from Elektor 
PCB, bare
050056-1
 

Order from Eurocircuits 

PCB, bare
 

Free downloads 

050056-11.zip

Free download
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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