Products/Server Room Monitor
Server Room Monitor
A climate and power monitor built for the server room of the Physics Department at the Federal University of Ceará (UFC). It watches temperature, humidity and the air-conditioning load, and reports everything over MQTT.
- 9 × temperature + humidity
- 3 × AC current
- MQTT + JSON
- Arduino Mega 2560
What it does
Every sensor, around the clock
Climate across the room
Nine DHT11 sensors spread over the room report temperature and humidity. The monitor averages them and leaves out any sensor that fails a reading, so one bad cable doesn't skew the result.
Air-conditioning load
Three clamp-on current sensors (SCT-013) measure what each air conditioner draws, so you can tell at a glance whether a unit has stopped working.
Data you can use anywhere
Readings go out as JSON over MQTT on separate topics for temperature, humidity and current, ready for Home Assistant or any dashboard that speaks MQTT.
Status on the wall
A 20 × 4 LCD rotates through network status, the time (synced over NTP) and the latest readings, so you can check the room without a computer.
How it's built
From the sensors to the dashboard
- 9 × DHT11 · 3 × SCT-013sensors
- Arduino Mega 2560averaging · LCD · NTP
- EthernetW5100 / ENC28J60
- MQTT brokerJSON topics
- Home Assistantor any dashboard
Example message
Temperature readings, published on sensores/ArduinoDHT11AC/Temp:
{
"Temp1": 25.5, …, "Temp9": 26.0,
"MeanValueTemp": 25.8
}The project
Developed between December 2024 and February 2025 together with the department. The full source code and wiring are on GitHub.
It's not for sale, but the same approach works for labs, small data rooms and workshops.
Custom work
Need eyes on your own room?
Sensors, MQTT, dashboards: tell us what you need to watch and we'll build the first working version.