- on Microcontrollers
- Published in issue 3/2008 on page 64
Cheap, DIY and with CAN!
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.
3 March 2008
The copper track layout of PCB # 070786-I has been modified in the relay area to ensure electrically safe copper track/component wire distances when 230 VAC loads are used on the relay contacts.
The PCB modifications do not affect the circuit operation or functionality as described in the article.
PCBs sold separately as well as contained in the kit supplied for this project, are suitable for use with 230 V loads within the constraints mentioned in the article. Updated PCB artwork files are available under "Downloads".
R1 = 8-pin SIL array 4 x 4kΩ7*
R2 = 8-pin SIL array 4 x 10kΩ*
R3 = 8-pin SIL array 4 x 330Ω*
R4,R5 = 8-pin SIL array 4 x 220Ω*
R6 = 220
R7 = 390
R8 = 120
R9 = 8-pin SIL array 4 x 2kΩ2*
R10 = 8-pin SIL array 4 x 1kΩ*
R11 = 33
P1 = 10kΩ preset
* see text
C1,C6,C7 = 10µF 25V radial
C2,C4 = 22pF
C3,C5 = 100nF
D1-D5,D8,D9,D12,D13 = 3mm LED
D6,D7,D10,D11 = 1N4001
B1 = B80C1500 (round case; 80Vpiv @ 1.5Ap)
T1-T8 = BC547
IC1 = TLP620-4
IC2 = 7805
IC3 = MCP2515-I/P
IC4 = MCP2551-I/P
Re1-Re4 = 12V relay, SPDT, e.g. Omron G5LE-1
X1 = 20MHz quartz crystal
K1,K4,K9 = 2-way PCB screw terminal block, lead pitch 5mm
K5 = 14-way boxheader
K6 = AC/DC low-V adapter socket, PCB mount, e.g. CUI Inc. # PJ-002B (Digikey # CP-002B-ND) or Cliff Electronic Components # DC10B (Farnell # 224960)
K7,K8,K10,K11 = 3-way PCB screw terminal block, lead pitch 5mm
ECIO = ECIO-40P processor module (Elektor Shop)
LCD1 = LCD, alphanumerical, 2x16 characters, e.g. Displaytech 162
JP1 = 3-way SIL pinheader with jumperPCB, order code 070786-1 (updated copper track layout)