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May 15, 2008
Delphi / C
Dallas Personal Roboitcs Group (www.dprg.org)
UTA BSCSE 1985
Computer Graphics / Embedded Computing / Robotics
about 4 years ago
Yeah, Everything has to be just right for communication to work. Maybe someone can answer this question: Does SF still sell anything that is shipped with firmware that with receive factory default firmware fob messages? This is real handy start point. From there if you want to change FOB firmware you can, but can always reload factory firmware and verify your FOB is working.
Good Question. SF used to sell a MiRF? module that shipped with firmware that would receive default fob firmware messages. One of their nRF2401 modules would plug into it and blink LEDs and send serial data to terminal to let you know everything worked.
From there careful modification to programs to “keep things working” On FOB, I had no debug facility so I would write data chip EEPROM and read out with programmer.
When programming FOBs I use a male 6 pin header friction fit into holes on fob. To keep the radio chip power within spec (3.6 volts and below), I pulled the +5 pin from the header making it a 5 pin header. The coin cell provides power for the Tiny24 while it is being programmed. The I/O on the 24L01+ is 5 volt tolerant, its power supply pins are not.
about 6 years ago
If there is a rev 2 on this board, would be super sweet if there were at least pads for a crystal. Nice to not be limited to 9600 baud using microcontroller RC osc. Then the Mega168 could talk say 115,200 baud to host through FTDI chip – very handy when you really start using power of NRF24L01.
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