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(Die Seite wurde neu angelegt: „==What== A voting device, similar to edubuzzer but with the design-goal of being super-cheap. ==Hardware== ===MCU=== ===RF=== ===Display?=== ===Buttons=…“)
 
(new MCU)
 
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==Hardware==
==Hardware==
bare PCB, no container (yet)


===MCU===
===MCU===
[http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00088500.pdf STM32F030F4P6]
Reasons:
* Cheap (€.9 at 10+ pieces)
* Powerful (up to 24MHz), Cortex-M0
* Built-in clock adequate
* Easy to use package (TSSOP20)
* 3.3V levels
[http://at.mouser.com/ProductDetail/STMicroelectronics/STM32F030F4P6/?qs=%2fha2pyFadujR%2fWSfahMbfiqiWxswwapRJ1bzZ2a6qLp0xVcIZiSvQA%3d%3d Mouser-Link]
Four caps needed: 100nF+4.7µF for VDD, 10nF+1µF for VDDA.
Alternatives:
* STM32F100C8 (faster, a bit more expensive)
* Freescale Cortex-M0
* MSP430G2553
* [https://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=48872 RFD22301] (probably far too expensive, but it includes the RF stuff)
* ATmega328P @ 3.3V, 8MHz


===RF===
===RF===
[http://www.aliexpress.com/item/NRF24L01-wireless-module-2-4-G-wireless-communication-module/659713224.html nRF24L01+ module]
[https://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo some info for using them with Arduinos]
Reasons:
* Cheap
* Small
* Relatively low-power
* Easy to use
* Lot of libraries for it
* Supports point-to-point, broadcasts and multiple channels
* Special module versions available with ranges of up to 1100m
* Uses 3.3V levels
There are a lot of modules with that chip available. Most of them use a 2x4pin 0.1" connector with a standard pinout. There are also much smaller SMD modules available, but these are more expensive and do not seem to have a standard pinout or layout.
Alternatives:
* Bluetooth 4.0 Low Energy (nRF8001, BLE113-A, CC2541, …)
* [http://www.aliexpress.com/item/50-pairs-433Mhz-RF-transmitter-and-receiver-link-kit-Remote-control-for-Arduino-ARM-MCU/1633899814.html 433MHz RF wireless transmitter module] (one-way only!)
* 802.11b/g/n ([http://www.adafruit.com/products/1469 CC3000], [http://www.aliexpress.com/item/USR-WIFI232-G-WIFI-HF-LPB/1190265571.html HF-LPB], …)


===Display?===
===Display?===
Nokia 5110 display
Reasons:
* Cheap
* Small
* Low-power
* Lot of libraries for it
* Can mount directly to the PCB, no expensive/rare connector required
* Uses 3.3V levels
Alternatives:
* Just some status LEDs (takes a lot of power)
* [http://www.sharpmemorylcd.com/1-28-inch-memory-lcd.html Sharp Memory Display]
* Liquid Crystal display without a backlight
* Two flipdot-dots?


===Buttons===
===Buttons===
5x5mm button
Reasons:
* Cheap
* Large enough for humans to handle
Alternatives:
too many to list


===Leds===
===Leds===
None
Reasons:
* LEDs require a lot of power
* Not a lot of expressiveness with them
===Power===
Coin Cell: CR2032, 3V
Reasons:
* Cheap
* Low self-discharge
Unsolved problems:
* Does not deliver a lot of power (~0.1mA per spec)
* Not a lot of capacity
Alternatives:
* AA battery (large, but cheap and easily available — only delivers 1-1.5V though)
* 2xAA battery for 2-3V (very large!)
* Lithium Polymer Battery (like the one used in the Magic Shifter)
* Solar Panel
===Other Stuff===
* [http://www.aliexpress.com/item/Free-Shipping-Wholesale-100-Original-3V-micro-vibration-motor-Mobile-Vibrator-Coin-Motor-Flat-10mm-x/1640402236.html Vibrator]
* [http://www.aliexpress.com/item/100pcs-lot-27mm-Piezoelectric-Ceramic-pieces-Copper-Buzzer-Film-Gasket/1563222762.html Buzzer]
==BOM==
Table here..




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NRF shield
NRF shield
 
[[Datei:Moderator-Raspberry-Side.png|gerahmt|Raspberry Pi-to-nRF24L01+-Module Adapter]]
 


==Who==
==Who==

Aktuelle Version vom 18. Februar 2014, 01:02 Uhr

What

A voting device, similar to edubuzzer but with the design-goal of being super-cheap.


Hardware

bare PCB, no container (yet)

MCU

STM32F030F4P6

Reasons:

  • Cheap (€.9 at 10+ pieces)
  • Powerful (up to 24MHz), Cortex-M0
  • Built-in clock adequate
  • Easy to use package (TSSOP20)
  • 3.3V levels

Mouser-Link

Four caps needed: 100nF+4.7µF for VDD, 10nF+1µF for VDDA.

Alternatives:

  • STM32F100C8 (faster, a bit more expensive)
  • Freescale Cortex-M0
  • MSP430G2553
  • RFD22301 (probably far too expensive, but it includes the RF stuff)
  • ATmega328P @ 3.3V, 8MHz

RF

nRF24L01+ module

some info for using them with Arduinos

Reasons:

  • Cheap
  • Small
  • Relatively low-power
  • Easy to use
  • Lot of libraries for it
  • Supports point-to-point, broadcasts and multiple channels
  • Special module versions available with ranges of up to 1100m
  • Uses 3.3V levels

There are a lot of modules with that chip available. Most of them use a 2x4pin 0.1" connector with a standard pinout. There are also much smaller SMD modules available, but these are more expensive and do not seem to have a standard pinout or layout.

Alternatives:

Display?

Nokia 5110 display

Reasons:

  • Cheap
  • Small
  • Low-power
  • Lot of libraries for it
  • Can mount directly to the PCB, no expensive/rare connector required
  • Uses 3.3V levels

Alternatives:

  • Just some status LEDs (takes a lot of power)
  • Sharp Memory Display
  • Liquid Crystal display without a backlight
  • Two flipdot-dots?

Buttons

5x5mm button

Reasons:

  • Cheap
  • Large enough for humans to handle

Alternatives:

too many to list

Leds

None

Reasons:

  • LEDs require a lot of power
  • Not a lot of expressiveness with them

Power

Coin Cell: CR2032, 3V

Reasons:

  • Cheap
  • Low self-discharge

Unsolved problems:

  • Does not deliver a lot of power (~0.1mA per spec)
  • Not a lot of capacity

Alternatives:

  • AA battery (large, but cheap and easily available — only delivers 1-1.5V though)
  • 2xAA battery for 2-3V (very large!)
  • Lithium Polymer Battery (like the one used in the Magic Shifter)
  • Solar Panel


Other Stuff

BOM

Table here..



Basestation

RaspberryPi

NRF shield

Raspberry Pi-to-nRF24L01+-Module Adapter

Who

Overflo

anlumo

Abgerufen von „https://metalab.at/alpakaparty/index.php?title=Moderator&oldid=53151“