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==Hardware== | ==Hardware== | ||
| + | |||
| + | bare PCB, no container (yet) | ||
===MCU=== | ===MCU=== | ||
| + | |||
| + | [http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1031/LN775/PF216839 STM32F100C8T6] | ||
| + | |||
| + | Reasons: | ||
| + | |||
| + | * Cheap | ||
| + | * Powerful (up to 24MHz), Cortex-M3 | ||
| + | * Lots of GPIOs | ||
| + | * Small (LQFP48) | ||
| + | * 3.3V levels | ||
| + | |||
| + | Alternatives: | ||
| + | |||
| + | * STM32F0xx | ||
| + | * 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=== | ||
| + | |||
| + | 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?=== | ===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 | ||
==BOM== | ==BOM== | ||
Version vom 12. Februar 2014, 03:32 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
