HSC2011/Hardware
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Version vom 2. Mai 2011, 15:12 Uhr von Chrysn (Diskussion | Beiträge) (restructuring, part 1 (headings))
< 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 (read the building documentation for details).
PCB
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 | |
| LF50CV | 1 | VREG1 | G6 | |
| 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! |
