ESP8266 Community Forum

- Sun Dec 03, 2017 12:37 pm #72273 This is interesting/frustrating. I had an example using a single I2C BME280 at ranges of 6', 15', and sporadically 50' in a previous post.
http://www.esp8266.com/viewtopic.php?p=72098#p72098

When I added multiple I2C busses, I still got these different ranges to work.
http://www.esp8266.com/viewtopic.php?p=72115#p72115

Now I have tried adjusting the communication speed and I can't get anything more than 6' cable to work. I can't even go back to my old code, so I'm assuming I changed something in the ESP that's persistent now.

- Sun Dec 03, 2017 1:12 pm #72274 This is where I tell the programmer (at work) to get a digital scope and see what the waveform looks like. At both ends.

- Sun Dec 03, 2017 1:30 pm #72275 As a hobbyist I don't have a scope unfortunately. Best I can do is use an Arduino sketch.

- Sun Dec 03, 2017 1:56 pm #72278

Now I have tried adjusting the communication speed and I can't get anything more than 6' cable to work. I can't even go back to my old code, so I'm assuming I changed something in the ESP that's persistent now.

which is not possible as i2c is pure software implementation on esp8266