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===MCU===
 
===MCU===
  
[http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1031/LN775/PF216839 STM32F100C8T6]
+
[http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00088500.pdf STM32F030F4P6]
  
 
Reasons:
 
Reasons:
  
* Cheap
+
* Cheap (€.9 at 10+ pieces)
* Powerful (up to 24MHz), Cortex-M3
+
* Powerful (up to 24MHz), Cortex-M0
* Lots of GPIOs
+
* Built-in clock adequate
* Small (LQFP48)
+
* Easy to use package (TSSOP20)
 
* 3.3V levels
 
* 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:
 
Alternatives:
  
* STM32F0xx
+
* STM32F100C8 (faster, a bit more expensive)
 
* Freescale Cortex-M0
 
* Freescale Cortex-M0
 
* MSP430G2553
 
* MSP430G2553

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