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Forum Index : Microcontroller and PC projects : I2C addresses and CCS811

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geodav
Newbie

Joined: 09/05/2014
Location: Australia
Posts: 12
Posted: 02:32am 19 Mar 2020
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Hi Gurus, have  been using the amazing Airquality monitor by Goeff Graham.

question: how would the I2C address change if 2 slave CCS811 modules were to be linked up to the same micromite in Goeff.S mmbasic touch screen program as published by Silicon chip Jan 2020 ?

Obviously I dont understand I2C that well as its my first use.

regards
George
 
CircuitGizmos

Guru

Joined: 08/09/2011
Location: United States
Posts: 1427
Posted: 02:12pm 19 Mar 2020
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The CCS811 responds to two different I2C addresses based on a pin on the chip. Pin 1, named ADDR, is the selection pin that allows two alternate addresses to be selected:

If ADDR is low (0) the 7 bit I²C address for the chip is 0x5A (90 decimal)

If ADDR is high (1) the 7 bit I²C address for the chip is 0x5B (91 decimal)
Micromites and Maximites! - Beginning Maximite
 
geodav
Newbie

Joined: 09/05/2014
Location: Australia
Posts: 12
Posted: 11:05pm 19 Mar 2020
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Thanks for that CG,  I shall follow this protocol you outlined.
 
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