The SHT30 I2C Temperature an Humidity Sensor

Introduction

The SHT30 is a temperature and humidity sensor for the I2C bus. Typical accuracy for temperature is +- 0.1 °C and +- 1.5% relative humidity. Sensirion, the company behind the SHT30 supplies a series of documents including the data sheet, several application notes and sample code, written in C STM32F10x microcontroller. You can find it at https://www.sensirion.com/en/download-center/humidity-sensors/digital-humidity-sensors-for-various-applications.

There is also a SHT30 driver written for MicroPython on the ESP8266 but unfortunately it did not work on the ESP32 out of the box and it implements only a small subset of the SHT30's functions. I therefore developed a driver called sht3x translating the Sensirion code into MicroPython.

Here is a list of functions, their command codes and if they are implemented in the SHT30 driver:

Function	Repeatability	measurement per s	Clock Stretching	Command Code	Implemented in SHT30 driver
Single shot data acquisition	High		enabled	0x2C06	no
	Medium			0x2C0D	no
	Low			0x2C10	no
	High		disabled	0x2400	yes
	Medium			0x240B	no
	Low			0x2416	no
Continuous data acquisition	High	0.5	disabled
	Medium
	Low
	High	1
	Medium
	Low
	High	2
	Medium
	Low
	High	4
	Medium
	Low
	High	10
	Medium
	Low

-- Uli Raich - 2020-05-22

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Topic revision: r1 - 2020-05-22 - UliRaich