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[[Datei:Moderator-Raspberry-Side.png|gerahmt|Raspberry Pi-to-nRF24L01+-Module Adapter]] | |||
==Who== | ==Who== |
Version vom 12. Februar 2014, 04:07 Uhr
What
A voting device, similar to edubuzzer but with the design-goal of being super-cheap.
Hardware
bare PCB, no container (yet)
MCU
Reasons:
- Cheap
- Powerful (up to 24MHz), Cortex-M3
- Lots of GPIOs
- Small (LQFP48)
- 3.3V levels
Alternatives:
- STM32F0xx
- Freescale Cortex-M0
- MSP430G2553
- RFD22301 (probably far too expensive, but it includes the RF stuff)
- ATmega328P @ 3.3V, 8MHz
RF
nRF24L01+ module
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, …)
- 433MHz RF wireless transmitter module (one-way only!)
- 802.11b/g/n (CC3000, HF-LPB, …)
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
BOM
Table here..
Basestation
RaspberryPi
NRF shield
Who
Overflo
anlumo