Grégory Ester
About the article

Educational Expansion Board

With handy general-purpose peripheral functions

Educational Expansion Board

This expansion card, which is designed to be used with the Elektor ATM18 board, should come in handy for all sorts of projects. The combination provides a platform that is very suitable for both rapid prototyping and educational use.Due to its suitability for educational applications, we have dubbed this board ‘EduCard’.

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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.

Extra info / Update
* 2 temperature sensors on I2C bus
* 2 DACs with SPI interface
* RC5 sensor
* Matrix keypad
* 7-segment LED display
* 8 digital inputs
* Real-time clock
* Potentiometer
* 5-V supply voltage
Download the BOM list
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.
Component list
R2–R9 = 10kOhm
R18,R19 = 2.2kOhm
R20 = 56Ohm
R1,R21–R28 = 1kOhm
R10–R17 = 150Ohm
R31–R38 = 470Ohm
R29 = 100 Ohm
R30 = 4.7kOhm
P1 = 10k horizontal, trimpot
C1 = 100?F 16V radial
C2–C6,C8,C9,C11 = 100nF
C7 = 22pF trimmer or 22pF capacitor
C10 = 470?F 25V radial
D1 = LED, low current, green
LD1 = 7-segment display, Avago type HDSP-315L
D2,D3 = BAT85, Schottky diode
D4 = 1N4001
IC1 = PCF8583
IC2,IC3 = PCF8574
IC4,IC5 = MCP4921
IC6,IC7 = DS18S20+
IC8 = 7805
X1 = 32.768kHz quartz crystal
CR2032 Lithium button cell, 3 V
S–S16 = pushbutton, PCB mount, push to make, e.g. SPNO-B3S series (Omron), Farnell # 118-1016
K2,K8,K9 = PCB solder pins or 2-way PCB terminal block
K1 = 2-pin pinheader, lead pitch 0.1’’ (2.54mm)
K3,K4,K7 = 5-pin socket strip, lead pitch 0.1’’ (2.54mm)
K6 = 4-pin socket strip, lead pitch 0.1’’ (2.54mm)
K5 = 16-pin socket strip, lead pitch 0.1’’ (2.54mm)
K10 = PCB mounting for CR2032 cell
K11-K12 = DC buzzer, 5 V/4 kHz
K13-K14-K15 = TSOP2236 or equivalent
K16 = 6-pin socket strip, lead pitch 0.1’’ (2.54mm)
JP1–JP15 = 2-pin pinheader with jumper, lead pitch 0.1’’ (2.54mm)
3 pcs 8-pin DIL IC socket
2 pcs x 16- pin DIL IC socket
PCB, # 100742-1

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