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https://github.com/rsc1975/micropython-sht30
SHT30 sensor driver in pure python based on I2C bus
https://github.com/rsc1975/micropython-sht30
Last synced: about 1 month ago
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SHT30 sensor driver in pure python based on I2C bus
- Host: GitHub
- URL: https://github.com/rsc1975/micropython-sht30
- Owner: rsc1975
- License: apache-2.0
- Created: 2017-01-03T16:54:24.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2019-06-07T19:03:06.000Z (over 5 years ago)
- Last Synced: 2024-04-22T13:30:45.026Z (8 months ago)
- Language: Python
- Size: 21.5 KB
- Stars: 42
- Watchers: 4
- Forks: 26
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-micropython - micropython-sht30 - Driver for SHT30 temperature and humidity sensor. (Libraries / Sensors)
- awesome-mpython - micropython-sht30 - Driver for SHT30 temperature and humidity sensor. (精选驱动库 / 传感器)
README
#SHT30 Sensor driver in micropython
Micropython driver for [SHT30 Shield](https://www.wemos.cc/product/sht30-shield.html) for [Wemos D1 Mini (and PRO)](https://www.wemos.cc/product/d1-mini-pro.html).
The driver has been tested on Wemos D1 mini PRO, but It should work on whatever other micropython board, if anyone find problems in other boards, please open an issue and We'll see.
##Motivation
The SHT30 shield for ESP8266 board Wemos D1 Mini has an Arduino driver but not a micropython one.
##References:
* [Sensor Datasheet](https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Sensirion_Humidity_Sensors_SHT3x_Datasheet_digital.pdf)
* [Arduino driver](https://github.com/wemos/WEMOS_SHT3x_Arduino_Library)
* [SHT30 C Code Examples](https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/11_Sample_Codes_Software/Humidity_Sensors/Sensirion_Humidity_Sensors_SHT3x_Sample_Code_V2.pdf) from sensor manufacturer
##Examples of use:
###How to get the temperature and relative humidity:
The `measure()` method returns a tuple with the temperature in celsius grades and the relative humidity in percentage.
If the measurement cannot be performed then an exception is raised (`SHT30Error`)
```python
from sht30 import SHT30
sensor = SHT30()
temperature, humidity = sensor.measure()
print('Temperature:', temperature, 'ºC, RH:', humidity, '%')
```
There is another method, `measure_int()`, that returns 4 integer values, **no floating point operation is done**, designed
for environments that doesn't support floating point operations, the four values are:
Temperature (integer part), Temperature (decimal part), RH (integer part), RH (decimal part)
For intance, if the `measure()` method returns `(21.5623, 32.0712)` the `measure_int()` method would return: `(24, 56, 32, 7)` The decimal
part is limited to 2 decimal digits.
```python
t_int, t_dec, h_int, h_dec = sensor.measure_int()
print('Temperature: %i.%02i °C, RH: %i.%02i %%' % (t_int, t_dec, h_int, h_dec))
```
Both methods allow a `raw` param that when It's `True` returns the sensor measurement as-is, It's a `bytearray(6)` with the format defined in the sensor datasheet document.
```python
raw_measure = sensor.measure(raw=True)
print('Sensor measurement', raw_measure)
```
###Check if shield is connected
```python
from sht30 import SHT30
sensor = SHT30()
print('Is connected:', sensor.is_present())
```
###Read sensor status
Check the [Sensor Datasheet](https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Sensirion_Humidity_Sensors_SHT3x_Datasheet_digital.pdf) for further info about sensor status register
```python
from sht30 import SHT30
sensor = SHT30()
print('Status register:', bin(sensor.status()))
print('Single bit check, HEATER_MASK:', bool(sensor.status() & SHT30.HEATER_MASK))
#The status register can be cleared with
sensor.clear_status()
```
###Reset the sensor
The driver allows a soft reset of the sensor
```python
from sht30 import SHT30
sensor = SHT30()
sensor.reset()
```
###Error management
When the driver cannot access to the measurement an exception `SHT30Error` is raised
```python
from sht30 import SHT30
sensor = SHT30()
try:
t, h = sensor.measure()
except SHT30Error as ex:
print('Error:', ex)
```