Article

Vision System for Small Microcontrollers

Few pixels -- clear sight

The originality of the vision system described in this article lies in the method developed for acquiring video images — a method that is entirely compatible with the low calculating power of the microcontroller used and the slow sampling speed offered by its built-in analogue/digital converter.

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Materials

090334-PCB.pdf

090334-11.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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The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Download Gerber file: 090334-1-V11

Extra info / Update

Technical characteristics

* PIC16F690 microcontroller
* 18 × 16 pixel B&W video image
* 4 grey levels
* LED illumination
* Relay control
* Image comparison
* Movement detection
* Serial link
* Constructional difficulty: medium

Components

The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.

Download the BOM list

Component list

Resistors (5%, 0.25W)
R1 = 75Ohm
R2 = 680kOhm
R3,R4,R5 = 4.7kOhm
R6 = 10kOhm
R7, R8, R17 = 1kOhm
R9–R12 = 470Ohm
R13 = 680Ohm
R14, R16 = 47kOhm
R15 = 1.5kOhm
Capacitors
C1 = 470µF 25V radial electrolytic, 10mm diam.
C2,C3,C5–C10 = 100nF, polyester (MKT), lead pitch 0.2 in.
C11–C15 = 1µF 16V, radial electrolytic, 5mm diam.
C4 = 220µF 25V, radial electrolytic, 8mm diam.
Semiconductor
D1, D2 = 1N4004
D3 = BAT48, Schottky diode, DO-35 case
D4 = LED, red, low current, 3mm
D5 = LED, green, low current, 3mm
D10 = LED, yellow, low current, 3mm
D6–D9 = infrared LED, QED222 (e.g. Farnell # 1652526)
D11 = 1N4148
IC1 = 7805, TO-220 case
IC2 = C-MOS IR camera module (CCIR*) e.g. Conrad Electronics # C-Cam-01 150001
IC3 = LM1881N/NOPB, DIP-8 case (e.g. Farnell # 1564700)
IC4 = MAX232N, PDIP-16 case
IC5 = PIC16F690-I/P, DIP-20 case (e.g. Farnell # 1103406)
Miscellaneous
RE1 = Relay, Multicomp type HRM1-S DC5V (e.g. Farnell # 9479937)
JP1–JP5 = 2-pin pinheader with jumper, 0.1 in. lead pitch
K1 = power supply connector, 2.1mm, horizontal, PCB mount
K2 = RCA (phono) connector, PCB mount
K3 = 6-pin pinheader, 0.1 in. lead pitch
K4, K5 = 3-way PCB screw terminal block, 5mm lead pitch
K6 = 9 way sub-D socket (female), horizontal, PCB mount
S1,S2 = pushbutton, e.g. Tyco Electronics type FSM4JH (Farnell # 1555982)
Sockets for IC3, IC4 and IC5 (8-pin, 16-pin, 20-pin respectively)
PCB, Elektor # 090334-1)