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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== | ||