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➜ Electronics
➜ Microprocessors
➜ I2C hanging problem - 2 Arduino's and an 3.3V I2C Sensor TMP102
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I2C hanging problem - 2 Arduino's and an 3.3V I2C Sensor TMP102
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| Posted by
| Ppl4world
(1 post) Bio
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| Date
| Sat 02 Jun 2012 07:17 AM (UTC) Amended on Sat 02 Jun 2012 07:18 AM (UTC) by Ppl4world
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| Message
| Hi, I was wondering if you or anyone has successfully connected 2 Ardunos AND a I2C 3.3 V sensor (e.g TMP102)
I can connect and communicate (using the Wire library) without problem 2 Arduinos (2 Uno's or 1 Uno and 1 Ethernet) or 1 Arduino with 5 Sensors. However whenever I try to connect 2 Arduino and 1 sensor the program hangs immediately (as observed via the printout in the serial-window stopping immediately upon connection)
I have tried with and without 4.7kO pull-ups.
All wires are very short, so capacitance should not be an issue.
I have tried in Master/Slave and Master/Master configurations.
I am Wire.read() the TMP102 temperature once per second so sampling should not be an issue
Even when the second Arduino has no communication code (like Wire.receive, etc) running. Simply connecting it's A4/A5 lines hangs the code on the first Arduino.
Any hints? I have banged my head against this for a while and searcher around and found "multiple Arduinos" and "multiple I2C sensors" but not "2 Arduinos and 1 (or more) sensors).
Thanks so much for any hint or advice, I'm truly at a loss here!
peter | | Top |
|
| Posted by
| Nick Gammon
Australia (23,070 posts) Bio
Forum Administrator |
| Date
| Reply #1 on Sat 02 Jun 2012 09:17 AM (UTC) |
| Message
| Looks like this is a cross-post to:
http://arduino.cc/forum/index.php?topic=108324
This has now been resolved. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
|
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