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Cheap server room temperature monitoring?
5 projects | reddit.com/r/sysadmin | 10 Feb 2021
If you want to go cheap per-sensor. Here's a tutorial on using an ESP32 (microcontroller w/ wifi) w/ a BME280 (good accuracy Temp/Pressure/Humidity sensor) to push to an MQTT broker. Or if you prefer some sample code in micropython to do the same. The combined cost for both components can be as little as $10 depending on the knock off on amazon. Or ~$30 for legit items from Adafruit.
What are some alternatives?
esphome - ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.
prometheus - The Prometheus monitoring system and time series database.
sysTAMI - the Temperature And Moisture Information system