HSC2011/Hardware: Unterschied zwischen den Versionen

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(defined serial interface, RF module; linked repository)
(Implementation: clifford measured send time)
Zeile 23: Zeile 23:
  
 
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.
 
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.
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Experiments showed that sending a login packet takes about 10ms.
  
 
[[Kategorie:HSC2011]]
 
[[Kategorie:HSC2011]]

Version vom 1. April 2011, 20:58 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.

Experiments showed that sending a login packet takes about 10ms.