Joe Ferner, I’m trying to add more I2C ports on Arduino Uno. Can it be used create an I2C Slave from an Arduino board? Wouldn’t it be possible to fix the original Wire library to be as robust as this one? Right now I’m using it to communicate with a SparkFun compass and 6DOF IMU. I kept the API as close to the stock hardware TWI interface so that you can switch it in and out (only two initialization lines have to change). I created something similar a couple months ago. Things like this always seem to appear at the right 🙂 I feel this may be very useful to me in the next few months.

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You can follow any responses to this entry through the RSS 2.0 feed. I’ve found using 2.2k resistors to be good. Of course, you still need pull-up resistors on the two lines. For the SoftI2CMaster library, I wanted it to be very tolerant, even lazy, about bus problems and also have more tunable timing to let you slow the bus down. If there is any noise or other bus problems, the Wire library will currently lock up. This is because the Wire library assumes a perfect bus. Because the I2C cable was longer than a few feet, the normal Wire library that BlinkM_funcs.h uses to communicate with BlinkMs couldn’t be used. It’s still a work in progress, but it can write data pretty successfully and do it over longer cables than normal.įor the VIMBY/Scion Hackerspace Challenge, I created an array of BlinkM MaxM-powered accent lights for the device we made. Get it here: SoftI2CMaster.h, SoftI2CMaster.cpp. Shares his latest knoledge about I2C:Įver wanted to use any pair of pins for I2C on Arduino, not just the dedicated pins on Analog 4 & 5? Me too, so I made a quick little Arduino library called “SoftI2CMaster”, available in the “blinkm-projects” Googlecode repository.

Arduing wire library