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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 (read the building documentation for details).


Build edubuzzer.gif

Part list

Partname Amount Position on PCB Bauteilsortiment known bugs
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
Piezo beeper 1 U3 S7
2x16 Pol, RM 2.00 1 U1 C5 needs 2x6 pin socket
RFM12B Radio module 1 U1 K8
28 PIN DIP Socket 1 IC4 D9
ATMEGA328P 1 IC4 -
10 uF Capacitor (elko) 1 C4 E0
22 pF Capacitor (ceramic) 2 C1, C2 A2
100 nF Capacitor (ceramic) 1 C3 C2 imprint unter loch
16 Mhz Crystal 1 CRYSTAL1 L0
9V battery clip 1 JP3 T3 imprint should say +/- not J3 ;)
FTDI connector 1 JP4 B6
Resistor 100 ohm 1 R10 N1 nicht bestücken! (R10)
Resistor 10K ohm 1 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 SW5 S9 connect over cable!