I am trying to use a lot (>30) of I2C sensors (all with the same address) connected to an ESP32 (or something similar) without the use of a mux. One solution I have found so far is an LTC4316 from Linear that can do I2C/SMBus address translation. The problem with this solution is that it requires t…

One solution I have found so far is an LTC4316 from Linear that can do I2C/SMBus address translation. The problem with this solution is that it requires the setting of address values via resistors and it is expensive. Why is an address translator OK but and I2C multiplexer is not? This solution…

horace: what are the I2C devices? do they have an address pin(s)? if so you could change the I2C address using digital IO pins also have a look at the TCA9545A I2C switch horace, we plan on using MMA8451 accelerometers. Yes this sensor has an address pin, but I only have 2 addresses to choose…

pylon, Our devices will be spread out over a linear distance of 300ft. With the LTC4316, I could put one of each I2C sensor and connect all devices to the same 2 wires. With the mux I would have to run many wires over great distances. One installation of these sensors could easily be 1000 units. Th…

you could use a digital IO pin to select the I2C device address see [Łukasz Kidziński] Multiple I2C sensors with the same address sensors, i2c, multiplexer asked by Łukasz Kidziński on 08:26PM - 04 Jan 17 UTC for a large numb…

pylon, Our devices will be spread out over a linear distance of 300ft. With the LTC4316, I could put one of each I2C sensor and connect all devices to the same 2 wires. With the mux I would have to run many wires over great distances. I2C is the wrong technology to cover a distance of 100m. You n…

Hi pylon You are absolutely right, standard I2C cannot support these kinds of distances. I plan on solving the distance problem with NXP PCA9615 differential I2C bus extenders. Even if I am only able to go 100 ft using the PCA9615, that is still good. I also agree with you on the number of devices…

have you considered using wireless such as Lora for communication? if you do a web search for lora crop monitoring or similar you will get plenty of links

What was the dollar quote for a commercial system? How much are you prepared to spend on a DIY system?

You are absolutely right, standard I2C cannot support these kinds of distances. I plan on solving the distance problem with NXP PCA9615 differential I2C bus extenders. Even if I am only able to go 100 ft using the PCA9615, that is still good. The PCA9615 might give you 3m which is way below the 3…

Custom Address Translation for I2C Sensors

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horace July 31, 2018, 5:21am 2

what are the I2C devices?
do they have an address pin(s)?
if so you could change the I2C address using digital IO pins

also have a look at the TCA9545A I2C switch

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Custom Address Translation for I2C Sensors

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