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

Introduction

The TEMP-1 from Apollo Automation redefines smart temperature monitoring by combining embedded 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 critical applications where energy reliability is paramount. Its open-source approach ensures complete transparency with access to YAML files, 3D plans, and active community support via Discord. This philosophy allows for advanced customization while maintaining a plug-and-play configuration for Home Assistant users.

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

Key Features

Multi-Sensor Monitoring System

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

Connectivity and Configuration

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

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 format for discreet installation)
• Case: 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)
• Embedded precision: ±0.3°C (calibration offset 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 magnet attachment on metal surfaces (optional)
• External Probes: Waterproof 20cm/1.5m, food-grade stainless steel 1m (sold separately) *
• Limitations: Indoor use only, ventilation required, probes sold separately

*More Information About the Probe

The food-grade probe is designed to withstand temperatures up to 350°C. However, to ensure measurement reliability, it has been tested in an oven up to approximately 200°C (400°F), which is the recommended usage limit.

The probe contains an internal resistance and its accuracy is optimal around 93°C (200°F). The further the measured temperature is from this value, the more the accuracy decreases. This is why its use is recommended up to 204°C (400°F).