I have found that the I2C interface of Linkit Assist 2502 have no pull-up resistance, may be you can try to soldering two 4.7K resistances between the I2C interface and 2.8V power.
I have found that the I2C interface of Linkit Assist 2502 have no pull-up resistance, may be you can try to soldering two 4.7K resistances between the I2C interface and 2.8V power.