Jee Labs Talk

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1. lordmundi
   

   I have an I2C device which has example code for the arduino. The arduino code uses the Wire library, which from my understanding, has an assumption that the devices are hooked up on pins 4 and 5 of the arduino.

   My question is this: is there any way I can use this arduino code on the Jeenode? For example, can I somehow map the pins on the jeenode to pins 4 and 5 of an Arduino and then run the code? If so, how do I do this?

   I ultimately want to run this using the Ports library but I'm having trouble and just wanted to try out the author's code to verify the I2C is indeed working.

   FG

   Posted 25/07/2010 02:50:27

2. stef007
   

   Arduino digital pin 4 == JeeNode Port 1 DIO

   Arduino digital pin 5 == JeeNode Port 2 DIO

   See jeenode v4 spec:

   Posted 25/07/2010 07:31:21

3. lordmundi
   

   thanks so much... and just happened to be reading a different forum post and saw this!!!

   http://news.jeelabs.org/2010/03/15/software-and-hardware-i2c/

   man... I search a lot... i don't understand why I seem to be stumbling upon this information rather than finding it in my searches!!!

   anyways, this is great. If I can ever figure out the voltage issue you helped me with on another post, this little "Port 0" conversion that JC has added will let me run unmodified Arduino code!

   Thanks!

   FG

   Posted 25/07/2010 14:42:38

4. lordmundi
   

   bah... problem. i thought this fixed my issue... but the I2C pins on Arduino are not digital pins 4 and 5... they are analog in 4 and 5, which I don't see listed on the jeenode spec.

   so, i'm guessing the pins used for Arduino (analog 4 and 5), don't exist on the jeenode? if so, bummer... was really hoping to use some unmodified Arduino code on the jeenode.

   Posted 25/07/2010 21:16:08

5. stef007
   

   Arduino analog pin 4 == JeeNode PSI/SDA

   Arduino analog pin 5 == JeeNode PSI/SCL

   Since you are talking about hardware I2C on the Arduino, you should use the hardware I2C lines on the JeeNode which are located on the PSI connector. I don't think you should have to rewrite anything in your Arduino code.

   Posted 25/07/2010 22:19:30

6. lordmundi
   

   aha... thank you so much... this in fact does let me run the code I want... i have just verified that. perhaps that mapping should go in that spec as well.

   now, just need to figure out to how to rewrite this code to use the ports library. I'm guessing, based off of the post I mentioned above, that I can probably just reference port 0 and work as normal. We'll see how it goes!

   Thanks so much for your help!

   FG

   Posted 26/07/2010 01:06:10