Apollo TEMP-1 - USB-C Connected Temperature Sensor for Home Assistant

Introduction

The TEMP-1 fromApollo Automation redefines intelligent temperature monitoring by combining on-board sensors and external probes in a compact USB-C-powered format. This revolutionary solution, certified "Works With Home Assistant", integrates natively via ESPHome for local control without cloud dependency.

Designed for permanent installations requiring continuous monitoring, the TEMP-1 USB-C excels in mission-critical applications where energy reliability is paramount. Its open-source approach guarantees total transparency, with access to YAML files, 3D drawings and active community support via Discord. This philosophy enables extensive customization while maintaining plug-and-play configuration for Home Assistant users.

The device transforms traditional monitoring into a multimodal alert system, combining measurement accuracy and automated reactivity to create an intelligent, scalable home monitoring ecosystem.

The product features an AHT20-F sensor for temperature and humidity measurement. Optional wired probes can be connected to this sensor's Jack input, for example a food probe

Key features

Multi-Sensor Monitoring System

• AHT20-F on-board sensor: simultaneous temperature/humidity measurement with dust protection
• External probe interface: 3.5mm jack compatible with waterproof DS18B20 and food-grade NTC probes*
• High-temperature monitoring: food-grade stainless steel probe up to 350°C for professional culinary applications *
• Submersible measurement: 20cm and 1.5m flat waterproof probes for refrigerators, swimming pools and aquariums

Intelligent Alert System

• Programmable RGB LED: customizable visual signaling (colors, patterns, intensity)
• Musical piezo buzzer: RTTTL sound alerts with complex melodies and volume control
• Real-time notifications: Automatic triggering on configurable temperature thresholds
• Automation integration: Home Assistant actions based on sensor readings

Connectivity and configuration

• Native ESPHome integration: Instant Home Assistant auto-discovery without manual configuration
• Pre-flashed firmware: Immediate deployment via built-in WiFi hotspot (192.168.4.1)
• OTA updates: Firmware upgrades over-the-air via ESPHome Device Builder
• Local API: Local data processing, confidentiality respected, no cloud required

Technical specifications

Hardware architecture

• Microcontroller: high-performance ESP32-C3-MINI-1 with integrated WiFi/Bluetooth
• Power supply: USB-C 5V DC, consumption ≤5W for continuous operation
• Connectivity: WiFi 802.11 b/g/n, Bluetooth support, native ESPHome API
• Dimensions: 48mm × 30mm × 14mm (compact size, discreet installation)
• Housing: Professional 3D design with optimized ventilation, STL files available

Sensor specifications

• Main sensor: AHT20-F temperature (-40°C to +80°C) and humidity (0-100% RH)
• On-board accuracy: ±0.3°C (offset calibration recommended for ESP32 thermal)
• Compatible probes: DS18B20 (-55°C to +85°C, ±0.5°C), food-grade NTC (up to 350°C )*
• Probe interface: 3.5mm jack, automatic Dallas/Food switching, hot-swap supported

Home Assistant integration

• Exposed entities: Ambient temperature/humidity, probe temperature, LED/buzzer control
• Advanced configuration: Temperature offsets, min/max thresholds, probe type selection
• Automations: Event triggers, conditional actions, custom alerts
• Compatibility: ESPHome, optional MQTT, Bluetooth proxy for network extension

Accessories and Options

• Magnetic support: Neodymium magnets for attachment to metal surfaces (optional)
• External probes: Waterproof 20cm/1.5m, stainless steel food-safe 1m (sold separately) *
• Limitations: Indoor use only, ventilation required, probes sold separately

*More information about the probe

The optional food probe is designed to withstand temperatures of up to 350°C. However, to ensure reliable measurements, it has been oven-tested up to around 200°C (400°F), the recommended operating limit.

The probe contains an internal resistor and is most accurate around 93°C (200°F). The further the measured temperature deviates from this value, the lower the accuracy. For this reason, its use is recommended up to 204°C (400°F).