MicroPython Library

The Soldered ElectrochemicalGasSensor MicroPython library reads this board through the ElectrochemicalGasSensor class in ElectrochemicalGasSensor.py, which uses the helper files ads1115.py and lmp91000.py. Give it an I2C bus, a sensor preset and an address, and it returns the gas concentration in PPM. Its hydrogen sulphide preset, SENSOR_H2S, is written for the SGX-4H2S-100 cell and reads about 2.6 times too low with this board's SGX-4H2S-300 cell, so use a custom SensorConfig with the 460 nA per ppm that the cell's datasheet gives, instead, as Read the gas concentration explains.

Not installed yet? Follow Quick Start before using the functionality pages.

Public sourceSoldered-ElectrochemicalGasSensor-MicroPython-LibraryMicroPython library for the Soldered electrochemical gas sensor breakouts.Pinned reference: commit 623e1e6

Functionality

Each page starts with one verified module example and explains every function the example uses to get that result.

MicroPython exampleRead the gas concentrationStart the board at 0x30 and print the gas concentration in PPM every 2.5 seconds.electrochemical-bridgeBoard.pyMicroPython exampleRead the gas concentration in PPBTalk to the ADC at the module's default address, 0x49, directly and print PPB every 2.5 seconds.electrochemical-singleSensor.pyMicroPython exampleAverage several readingsAverage five readings taken three seconds apart and print the result in PPB.electrochemical-averagedMeasurement.pyMicroPython exampleCalibrate the zero pointAdd a voltage offset so the reading sits at zero in clean air.electrochemical-calibrateSensor.pyMicroPython exampleUse a custom sensor configurationSet the cell sensitivity and the front-end settings yourself.electrochemical-customConfig.pyMicroPython exampleRead two sensorsCreate two sensor objects at two ADC addresses and print both readings in PPB.electrochemical-twoSensors.py