Apollo TEMP-1 Temperature Sensor

Measure temperature where it really matters with the Apollo TEMP-1

Standard temperature sensors only measure the surrounding air, but the Apollo TEMP-1 takes temperature measurement to a new level. This compact sensor hub is specifically designed to connect an external temperature probe, allowing you to easily and accurately take measurements in hard-to-reach places. For example, instantly measure the temperature in your freezer, refrigerator, hot tub, aquarium, BBQ, underfloor heating, or other places where standard sensors fall short.

Choose your version: constant USB-C power or flexible battery

The TEMP-1 is available as:

• USB-C version : continuous voltage, ideal for fixed locations such as in the meter cupboard or near equipment.
• Battery version : Powered by a rechargeable RC-CR123A or 16340 battery, suitable for mobile, wireless applications.

Caution: To prevent damage, use only rechargeable batteries of the correct type. (Battery not included.)

Choose your own measurement strategy

For optimal measurement accuracy, always use the TEMP-1 with one of the optional external temperature probes, temperature sensors, or probes. You can choose:

• Waterproof, flat cable temperature probe : ideal for running along the seals of a freezer door, or for use in an aquarium or water pipe.
• Food-safe stainless steel temperature probe : perfect for precise core measurements in barbecues, ovens, or smokers.

The 3.5 mm jack allows you to connect various probes, giving you flexibility for any conceivable application.

Accuracy

The TEMP-1 also includes an internal AHT20-F sensor for basic temperature and humidity measurements. However, using an external temperature probe provides the most reliable readings, as the internal sensor can be slightly affected by heat from the ESP chip. Thanks to smart power-saving sleep settings, the temperature sensor can still measure very accurately while running on battery power without heat buildup.

Direct notifications and full smart integration

• Bright RGB LED and buzzer : visual and acoustic notifications when, for example, the freezer or refrigerator temperature is too high.
• Home Assistant and Homey ready : fully locally connected via ESPHome, without cloud.
• Flexible mounting : optional magnetic holder for quick placement on metal, e.g. refrigerator or BBQ.

Example automation

Mount the TEMP-1 to the side of your freezer (this is easy to do without screws or adhesives using the magnetic TEMP-1 Holder ) and place the flat temperature sensor between the frozen items. Set the following in Home Assistant:

If the temperature rises above -15°C, the RGB LED will turn red and you'll receive an alarm on your phone. This prevents unnoticed defrosting in the event of a power outage or malfunction.

Technical specifications

• Connectivity : Wi-Fi, Bluetooth (ESP32-C3-Mini)
• Connection : 3.5 mm jack for external temperature sensors/probes (DS18B20 or NTC)
• Built-in sensor : AHT20-F temperature and humidity sensor
• Power : USB-C (5V) or 1x RC-CR123A/16340 battery (not included)
• Extras : RGB LED, Piezo buzzer
• Dimensions : 40 x 32 x 13 mm

Please note: Probe, USB-C cable/adapter and batteries not included.

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