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3

This is to be expected. I²C is an open drain bus i.e. NO active pull-ups, intended for short range low speed on board interconnection between devices. "As I mentioned I’m a newbie so I don’t know what pull ups are." I did answer "Why is the I2C sensitivity different than the GPIO pins", but unless you have the requisite background you ...


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First start by finding the I2C address of your sensor. Here's an explanation of how to do that: https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c (look under the section "Testing I2C"). Once you have the address, try the following Python code: import time import smbus address = 0x38 #Put your device's address ...


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The initial answer: It sounds like your solenoids are emitting electromagnetic interference (EMI); i.e. the solenoids are the source of the interference, the i2c circuitry is the victim. Your first step should be to remediate the source, rather than the victim. I can't give you much in the way of specific advice because you didn't provide a schematic, nor a ...


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Ten of these dual-UART add-ons would solve this: CJMCU-752 They're I2C or SPI (selected via a jumper) with selectable I2C address as well. Here's what to put in /boot/config.txt to get one I2C version working (with the i2c/spi pin wired to vcc) using address 0x4d which has the IRQ connected to the RPI GPIO pin 24:- # Set the dual-UART I2C WCMCU-752 IRQ pin ...


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