HSC2011/Hardware: Unterschied zwischen den Versionen
Chrysn (Diskussion | Beiträge) (range tested) |
Chrysn (Diskussion | Beiträge) (defined serial interface, RF module; linked repository) |
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| Zeile 10: | Zeile 10: | ||
* a 1-wire interface for authentication buttons (iButton) | * a 1-wire interface for authentication buttons (iButton) | ||
| − | For ease of development, they also get a serial interface. | + | For ease of development, they also get a serial interface ("FTDI cable" -- power supply + RX/TX + reset, also for flashing using a boot loader). |
== Implementation == | == Implementation == | ||
| − | Both for development and for the final version (as far as we know now), an | + | Both for development and for the final version (as far as we know now), an ATMega328 is used; for development, encased in an Arduino, which also binds the RX/TX pins to a USB serial interface. |
| − | As an RF module, RFM12B | + | As an RF module, RFM12B is used. |
| − | The wiring is defined in an eagle file in | + | The wiring is defined in an eagle file [http://github.com/Metalab/hsc2011/tree/master/hardware in the project repository]. |
=== RFM12B === | === RFM12B === | ||
Version vom 31. März 2011, 21:44 Uhr
Specification
Nodes are supposed to be equipped with:
- RF transceiver
- 4 buttons, labelled with digits, letters, colours (probably red / blue / green / yelow) and symbols (playstation style?)
- a LED for each button in matching colour
- an RGB LED
- a buzzer
- a 1-wire interface for authentication buttons (iButton)
For ease of development, they also get a serial interface ("FTDI cable" -- power supply + RX/TX + reset, also for flashing using a boot loader).
Implementation
Both for development and for the final version (as far as we know now), an ATMega328 is used; for development, encased in an Arduino, which also binds the RX/TX pins to a USB serial interface.
As an RF module, RFM12B is used.
The wiring is defined in an eagle file in the project repository.
RFM12B
A little very unprofessional test showed that with the current configuration (through-hole mounted RFM12B with the wire antennae bent to the opposite direction of the pins) with a sender at the whateverlab solder stations a receiver starts losing 6-long packets some steps outside the metalab door front and in the library. Even without further optimization, that should be sufficient for typical class rooms.
