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Environment Sensors: Difference between revisions
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In order to create the ideal environment for your cultivar, it is essential to be able to accurately measure temperature, humidity, pH, and light intensity. When providing additional Co<sub>2</sub>, a Co<sub>2</sub> sensor is also crucial. The sensors available to the consumer broadly fall into three categories: cheap and generic, DIY sensors for microcontrollers, and expensive "professional" devices. The cheap and generic devices can yield good results but aren't very accurate. Sensors to be used with microcontrollers are equally cheap but much more accurate with the caveat that they require a little electronics knowledge to use. Finally, "professional" devices are very accurate but much more expensive than other options. Generally speaking, the more accurate your sensors are the better growth (and yield) you will be able to achieve.
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A number of grow controllers based on microcontrollers or linux are available online.
There is a wide range of generic [[Temperature and Humidity|humidity and temperature]] sensors that are cheaply available. Some connect to a smartphone via Bluetooth and provide a graph of data while others incorporate a small LCD to display current readings.▼
* [https://github.com/thecannawiki/ESP32EnvironmentController ESP32EnvironmentController] Based on ESP32. Supports humidity, temperature, VPD and Co<sub><big>2</big></sub>
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* [https://github.com/supergreenlab/SuperGreenOS SupergreenOS] Based on espressif ESP32. No longer maintained
<li style="display: inline-block;"> [[File:Square sensor.png|thumb|none|300px]] </li>▼
== Humidity and Temperature ==
<li style="display: inline-block;"> [[File:Round humidity sensor.png|thumb|none|300px]] </li>▼
▲There is a wide range of generic [[Temperature and Humidity|humidity and temperature]] sensors that are cheaply available and provide reasonable accuracy.
▲<div align='center'><ul>
▲<li style="display: inline-block;"> [[File:Round humidity sensor.png|thumb|none|
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<p align='center'>Some generic examples</p>More accurate DIY sensors include the BME280 or BME680.
[[File:BME280.png|center|thumb|300x300px|BME280]]
DHT11 and DHT22 are often used to measure temp and humidity but the accuracy of humidity measurements in these sensors is too low to be useful for cultivation.
== Light ==
See [[Light#Measuring_light_intensity|Measuring light intensity]]
== Carbon Dioxide (Co2) ==
Many generic sensors are not accurate for measuring co2 as they also pick up other volatile compounds, however, the SGP30 sensor is accurate for those willing to take the DIY route.
[[File:Sgp30.png|center|frameless|275x275px|SGP30]]
== pH ==
When mixing concentrated liquid nutrients with water it's important to ensure the nutrient mix has the correct pH before applying it to the cultivar so that it can make use of the nutrients (see: nutrient lockout). There is no shortage of generic digital meters to choose from, however, many cheap digital meters are inaccurate and
== Total dissolved solids (TDS) ==
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