# 3-Way Temperature Sensor

An Atmega-based instrument for monitoring the temperatures of three devices at the same time.

2026-10-04
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Switchboard Tech Services


![3-Way Temperature Sensor](https://switchboardtechservices.com/media/assets/2026/10/7b20672d33c043e5bc9828dfa0bd98c6.jpg)

This was a project I undertook to experiment with creating a complete prototype using my electronics skills. I 3D-printed the housing and lined the back with magnets so it could adhere to the metal surfaces of the units being measured.

This project filled a practical need: it could simultaneously monitor three items, identify when one was overheating, and graph their temperature histories.

It worked fine on its first power-up.

## Instrument specifications

- **Measurement channels:** Three devices measured simultaneously
- **Controller:** Atmega microcontroller
- **Display:** LCD showing the current temperature for each channel
- **Recorded values:** Current, high, and average temperature for each individual device
- **Purpose:** Monitoring equipment and other items for signs of overheating
- **Construction:** Enclosed electronic instrument with probe connections, indicator lights, power switch, and battery power

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Canonical URL: https://switchboardtechservices.com/updates/3-way-thermometer/

Language: en-us

Content type: update

Author: Switchboard Tech Services

Published: 2026-10-04T14:27:56+00:00

Modified: 2026-10-04T14:37:30+00:00

Description: This three-way temperature sensor was built to detect overheating by recording current, high, and average temperatures for three individually monitored devices.