Timeline for Arduino: Reliable and practical way to connect an I²C device (1 m away)
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Oct 6, 2016 at 8:20 | vote | accept | AnoE | ||
| S Oct 5, 2016 at 6:22 | history | suggested | Peter Mortensen | CC BY-SA 3.0 |
Copy edited (e.g. ref. <http://english.stackexchange.com/questions/15953>). Removed historical information (e.g. ref. <http://meta.stackexchange.com/a/230693> and <http://meta.stackoverflow.com/questions/266164>). Removed meta information (this belongs in comments).
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| Oct 5, 2016 at 5:32 | review | Suggested edits | |||
| S Oct 5, 2016 at 6:22 | |||||
| Oct 4, 2016 at 23:57 | history | tweeted | twitter.com/StackElectronix/status/783456048275419136 | ||
| Oct 4, 2016 at 22:42 | history | edited | AnoE | CC BY-SA 3.0 |
added 138 characters in body
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| Oct 4, 2016 at 15:18 | comment | added | infixed | When I had a longish run I2C via a PIC processor, the issue was crosstalk between the clock and data lines. Certainly selecting the twisted pairs right can reduce that. But another thing was that the PIC I2C module had an option bit to limit rise/fall times. That reduced crosstalk immensely. I have no idea if your processor has such an option | |
| Oct 4, 2016 at 11:33 | answer | added | FiddyOhm | timeline score: 23 | |
| Oct 4, 2016 at 10:53 | history | edited | AnoE | CC BY-SA 3.0 |
added 141 characters in body
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| Oct 4, 2016 at 10:01 | comment | added | Arsenal | Things that work for 100 or 1000 times and then suddenly stop working can very well be a software problem (race conditions which might be even in you most trivial code). | |
| Oct 4, 2016 at 9:35 | comment | added | user98663 | Random thought: Are you running SCL and SDA together in a single twisted pair? It might be worth rigging up your connections so that you have ... (GND+SDA), (VCC+VCC), (GND+SCL), (INT+GND). Theory being that you might get spurious edges due to close coupling. | |
| Oct 4, 2016 at 9:30 | comment | added | Vladimir Cravero | Exactly, your clock frequency is key. I would not expect any particular problem for 1m cables, even at 400kHz. We regularily do this at work with three twisted cables, SDA, SCL and ground, no shield a lot of coupling and not an issue, and length is about 1m. Also reducing your pullup resistors to something like 1k might help. | |
| Oct 4, 2016 at 9:27 | comment | added | user98663 | What frequency are you running your I2C at? Have you tried slowing it down? What VCC voltage have you got at the far end of the cable? What are you doing with the cable shield? | |
| Oct 4, 2016 at 9:19 | history | asked | AnoE | CC BY-SA 3.0 |