Introduction
On the verge of producing a first series of xSpectre´s spectrometer, which should be version 0.80, this post lists all the sensors and accessories that the model should be able to carry.
DFRobot
Gravity: Analog CH4 Gas Sensor (MQ4) For Arduino, and how to hook up Arduino Project Hub: Gas Analyser Using Arduino.
SEEED technology
Water level sensor at USD 79.
The Grove - SCD30 is a 3-in-1 Arduino sensor that can measure CO2, temperature, and humidity.
Grove - Carbon Dioxide Sensor(MH-Z16), including scientific reported project on soil breathing project. At Aliexpress you can get 10 at 360 USD, which is about 1/3 of the price of the SEEEDstudie MH-Z16 sensor in Sweden.
Building an IoT project
With the SenseCAP S2110 controller and S2100 data logger, you can easily turn the CO2 Grove into a LoRaWAN® sensor. Seeed not only helps you with prototyping but also offers you the possibility to expand your project with the SenseCAP series of robust industrial sensors, should be possible to add soil moisture (yes), temperature (yes), methane (maybe) and ground water level (maybe).
The IP66 housing, Bluetooth configuration, compatibility with the global LoRaWAN® network, built-in 19 Ah battery, and powerful support from APP make the SenseCAP S210x the best choice for industrial applications. The series includes sensors for soil moisture, air temperature and humidity, light intensity, CO2, EC, and an 8-in-1 weather station. Try the latest SenseCAP S210x for your next successful industrial project.
IoT into the wild
IoT into the Wild Hackster
Wireless Monitoring System for GHGs emissions in Paddy Field, centered around a Gravity: Analog CH4 Gas Sensor (MQ4) For Arduino.
Sensoterra
https://www.sensoterra.com
Other inspirations
https://blog.quickbird.uk/ec-and-ph-sensors-for-arduino-98bb70c756b9