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    Using I2C is a good idea but on an ESP-01 because there are only two lines there is a possibility that an I2C device may put the ESP into "flash mode". If you are using an I2C device that write to the microprocessor then there is a higher chance of this happening. HOWEVER there is only a small chance of it happening, it will depend on you hardware and devices, etc (i.e. it probably won't happen, but...) Commented Sep 14, 2017 at 12:18