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< HSC2011

Hardware Specification

An EduBuzzer contains an ATMega328 connected to:

  • 4 buttons in distinct colours (red / blue / green / yelow)
  • 4 LEDs matching the buttons
  • an RGB LED
  • a piezo buzzer
  • a 1-wire interface for authentication buttons (iButton)
  • an RF transceiver (RFM12B 868MHz model)
  • a 9V block battery and a power switch

For ease of development and as to make an EduBuzzer expandable to an EduBuzzer base station, a serial line is exposed for connection with an "FTDI cable" -- power supply, RX/TX, reset button. Thus, the devices can be flashed using a bootloader.

The design takes care to stay compatible with the Arduino even if not Arduino is used in the final version. Thus, prototypes can be built on Arduino shields as well.


Build edubuzzer.gif

The PCBs are described as Eagle files in the project repository in the hardware directory in buzzer.{brd,sch}. It is routed on two sides and has three big holes for mounting inside the EduBuzzer.

For prototypes based on an Arduino, a reduced wiring scheme is described in hardware/arduino_schield.sch, which can be reproduced on an Arduino prototyping shield or a custom shield described in hardware/arduino_schield.brd. Those devices won't fit in the cases, apart from that, are fully usable as well.

For further information, read the building documentation.

Part list

This describes all the electronic parts required for completing the buzzer shield. Parts not needed in combination with an Arduino have their count as the second one in the Amount column. The Bauteilsortiment column refers to where you can find them in the metalab's parts repository.

Partname Amount Position on PCB Bauteilsortiment notes
LED 5mm BLUE 1 D1 -
LED 5mm GREEN 1 D2 G4
LED 5mm YELLOW 1 D3 -
LED 5mm RED 1 D4 H4
Pushbutton 4 SW1, SW2, SW3, SW4 E9
LF50CV 1 (0) VREG1 G6
Piezo beeper 1 U3 S7
2x16 Pol, RM 2.00 1 U1 C5 cut down to 2x6 pin socket
RFM12B Radio module 1 U1 K8 solder antenna to the big hole next to the letters 'M1' on the back side
28 PIN DIP Socket 1 (0) IC4 D9
ATMEGA328P 1 (0) IC4 -
10 uF Capacitor (elko) 1 C4 E0
22 pF Capacitor (ceramic) 2 (0) C1, C2 A2
100 nF Capacitor (ceramic) 1 (0) C3 C2 imprint under hole
16 Mhz Crystal 1 CRYSTAL1 L0
9V battery clip 1 (0) JP3 T3 imprint should say +/- not J3 ;)
6x100mil 90° jumper header 1 (0) JP4 B6 FTDI connector
Resistor 100 ohm 1 (0) R10 N1 do not place! (for Arduino reset behavior compatibility)
Resistor 10K ohm 1 (0) P9 P3 desc should be R9 not P9
Resistor 1K ohm 7 R5, R6, R7, R11, R12, R13 O2
Resistor 680 ohm 4 R1,R2,R3,R4 ? am plan noch als 1k eingezeichnet
Resistor 4K7 ohm 1 R8 -
RGB LED 5mm 1 D5 -
Switch MIYAMA MS 245 1 (0) SW5 S9 connect over cable!


The enclosure design is documented on its own page.