Print Page - WeatherShield - I2C address change possible?

Title: WeatherShield - I2C address change possible?
Post by: syrinxtech on February 05, 2016, 12:59:10 PM

Does anyone know if you can change the I2C address of the SI7021 chip? Unfortunately I have another board that also uses 0x40. From reading the SI7021.cpp file I saw a line that set the I2C address to 0x40. Can I change it there or is it set in firmware? Or, is there an option on the WeatherShield board to change this address?

Title: Re: WeatherShield - I2C address change possible?
Post by: emjay on February 05, 2016, 01:35:36 PM

Nope, fixed in hardware - https://www.silabs.com/Support%20Documents/TechnicalDocs/Si7021-A20.pdf (https://www.silabs.com/Support%20Documents/TechnicalDocs/Si7021-A20.pdf)

Title: Re: WeatherShield - I2C address change possible?
Post by: syrinxtech on February 05, 2016, 02:10:28 PM

Thanks @emjay.

It should be a crime to create an I2C device that has a hardcoded physical address.

Lucky for me my other board is hackable to change it's I2C address or I would have to swap out the WeatherShield.

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Hardware support => General topics => Topic started by: syrinxtech on February 05, 2016, 12:59:10 PM