0ric1 / Adafruit-sht31-for-PI

Adafruit sht31-d for Raspberry PI

Referance material

• i2c kernel documentation
• Official SHT31 c++ library for Arduino
• SHT31 manufacturer data sheet

Enable i2c on the PI in the usual way

• Run raspi-confid -> select enable i2c

  -- or --

• This is for raspbian jessie, wheezy is different.

• edit /etc/modules and add

• • i2c-bcm2708
• • ic2-dev

• edit /boot/config and add

• • dtparam=i2c_arm=on
• • dtparam=i2c1_baudrate=100000 <- This is default, remove 1 zero for this sht31 implimentation to work.

Prerequisites

This sh131 implimentation depends on i2c dev lib

• sudo apt-get install libi2c-dev

Below is also a good one to have while debugging, but be careful i2cdump from the below cause the sht31 interface to become unstable for me and requires a hard-reset to recover correctly.

• sudo apt-get install i2c-tools

on PI make sure below 2 commands are in /boot/config.txt

• dtparam=i2c_arm=on
• dtparam=i2c1_baudrate=10000

I know we are slowing down the baurate from optimal, but it seems to be the most stable setting in my testing. add another 0 to the above baudrate for max setting, ie dtparam=i2c1_baudrate=100000