HSC2011/Hardware: Unterschied zwischen den Versionen

(10 dazwischenliegende Versionen von 2 Benutzern werden nicht angezeigt)

Zeile 1:

~~== Specification ==~~

< [[HSC2011]]

~~Nodes are supposed to be equipped with:~~

== Hardware Specification ==

* RF transceiver

An EduBuzzer contains an ATMega328 connected to:

* 4 buttons~~, labelled with digits, letters,~~ colours (~~probably~~ red / blue / green / yelow~~) and symbols (playstation style?~~)

* ~~a LED for each button in~~ matching ~~colour~~

* 4 buttons in distinct colours (red / blue / green / yelow)

* 4 LEDs matching the buttons

* an RGB LED

* a buzzer

* 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.

== PCB ==

[[Datei:build_edubuzzer.gif|thumb]]

The PCBs are described as Eagle files in [[HSC2011/Download instructions|the project repository]] in the <tt>hardware</tt> directory in <tt>buzzer.{brd,sch}</tt>. 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 <tt>hardware/arduino_schield.sch</tt>, which can be reproduced on an Arduino prototyping shield or a custom shield described in <tt>hardware/arduino_schield.brd</tt>. Those devices won't fit in the cases, apart from that, are fully usable as well.

For further information, read the [[HSC2011/Building your own EduBuzzer#The main board|building documentation]].

~~For ease of development, they also get a serial interface.~~

== Part list==

~~== Implementation ==~~

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 [[Bauteilsortiment|in the metalab's parts repository]].

~~Both for development and for the final version~~ (~~as far as we know now~~)~~, an ATMega168 is used~~; ~~for development~~, ~~encased in an Arduino, which also binds~~ the ~~RX/TX pins~~ to ~~a USB serial interface.~~

{|border="1" cellpadding="5" cellspacing="0" style="text-align:left;"

! Partname !! Amount !! Position on PCB !! [[Bauteilsortiment]] !! notes

|- style="background:#ccc;"

| LED 5mm BLUE || 1 || D1 || -

|-

| LED 5mm GREEN || 1 || D2 || G4

|- style="background:#ccc;"

| LED 5mm YELLOW || 1 || D3 || -

|-

| LED 5mm RED || 1 || D4 || H4

|- style="background:#ccc;"

| Pushbutton || 4 || SW1, SW2, SW3, SW4 || E9

|-

| LF50CV || 1 (0) || VREG1 || G6

|- style="background:#ccc;"

| 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

~~As an RF module~~, ~~RFM12B and ZigBee~~ style ~~devices are being considered.~~

|- style="background:#ccc;"

| 28 PIN DIP Socket || 1 (0) || IC4 || D9

|-

| ATMEGA328P || 1 (0) || IC4 || -

|- style="background:#ccc;"

| 10 uF Capacitor (elko) || 1 || C4 || E0

|-

| 22 pF Capacitor (ceramic) || 2 (0) || C1, C2 || A2

|- style="background:#ccc;"

| 100 nF Capacitor (ceramic) || 1 (0) || C3 || C2 || imprint under hole

|-

| 16 Mhz Crystal || 1|| CRYSTAL1 || L0

|- style="background:#ccc;"

| 9V battery clip || 1 (0) || JP3 || T3 || imprint should say +/- not J3 ;)

|-

| 6x100mil 90° jumper header || 1 (0) || JP4 || B6 || FTDI connector

|- style="background:#ccc;"

| 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

|- style="background:#ccc;"

| 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

|- style="background:#ccc;"

| Resistor 4K7 ohm || 1 || R8 || -

|-

| RGB LED 5mm || 1 || D5 || -

|- style="background:#ccc;"

| Switch MIYAMA MS 245 || 1 (0) || SW5 || S9 || connect over cable!

|}

~~The wiring is defined in an eagle file in our yet-to-be-set-up SVN repository.~~

== Enclosure ==

~~=== RFM12B ===~~

The enclosure design is documented [[HSC2011/Enclosure|on its own page]].

A little very unprofessional test showed that with the current configuration (through-hole mounted RFM12B with the wire antennae bent to the opposite direction of the pins) with a sender at the whateverlab solder stations a receiver starts losing 6-long packets some steps outside the metalab door front and in the library. Even without further optimization, that should be sufficient for typical class rooms.

[[Kategorie:HSC2011]]