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  • Author Author: doorknob
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Getting started with Gertduino -  Are you serial?

doorknob

Yes indeed, I'm super serial right now. Or is that supposed to be 'super cereal'?


I carefully followed the instructions for disabling login via the Pi's serial port. Then I disabled the Pi's boot messages (out to the serial port), shut down the system, set the jumpers to connect the Pi's serial transmit line to the Gertduino's serial receive line (and vice-versa), powered up the system (it booted up just fine, yay!), installed the minicom terminal emulator, installed the scrot screen capture utility, brought up the LXDE graphical environment, started minicom at 9600 bps over port /dev/ttyAMA0, started the arduino IDE, loaded, compiled, then uploaded the simple sample serial program Serial_startup.ino to the Gertduino, and this was the result: 

 

image

 

(I also tested keying into minicom and watching it echoed back, so both directions seem to be working.)

 

To set up the jumpers to let the Pi talk to the Gertduino, you need to hook them up in a criss-cross pattern. I used a hand wire-wrap tool and two short, pre-stripped lengths of #30 Kynar wire to make the connections. Here's a blurry photo (sorry) showing the jumpers:

 

image

 

I hereby declare phase 1 of my phased approach to getting the two boards talking a success. Phase 2 will involve a Python program talking to an Arduino program.

 

But before I go there, here's a really artistic photo showing the Gertduino's blue LEDs brightly lit up to celebrate the achievement:



image

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  • I also have followed these steps:

    arefully followed the instructions for disabling login via the Pi's serial port. Then I disabled the Pi's boot messages (out to the serial port), shut down the system, set the jumpers to connect the Pi's serial transmit line to the Gertduino's serial receive line (and vice-versa), powered up the system (it booted up just fine, yay!), installed the minicom terminal emulator,


    I just can't remember if i did it manually, or if i used Gordon's script. Either way, it is complete.  I use minico to connect to the arduino (pi - 328 using the crossed wires) but all i get is gibberish in the window. Anything I Might be missing?

  • in reply to wegunterjr

    Receiving gibberish through serial communications often is a symptom of a bit rate mismatch between the sender and the receiver.

     

    I am away from my system at the moment, but IIRC both ends of the link were set for 9600 bps. Is that what you have set up?

  • in reply to doorknob

    I am trying it again, but I am pretty confident I was using 9600 for each (the arduino code, and the minicom tool) 

    minicom -b 9600 -o -D /dev/ttyAMA0

     

    I am hoping I can get this working, so that I can finish up my final. I plan to use the raspberry pi/gertduino combination to run a planned path that I have figured out in the raspberry pi.  Just a little frustrated that my outcome is not going quite as well as yours....

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  • in reply to doorknob

    I am trying it again, but I am pretty confident I was using 9600 for each (the arduino code, and the minicom tool) 

    minicom -b 9600 -o -D /dev/ttyAMA0

     

    I am hoping I can get this working, so that I can finish up my final. I plan to use the raspberry pi/gertduino combination to run a planned path that I have figured out in the raspberry pi.  Just a little frustrated that my outcome is not going quite as well as yours....

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