Apollo TEMP-1B - Battery Powered Wireless Temperature Sensor for Home Assistant

Introduction

The TEMP-1B fromApollo Automation revolutionizes mobile temperature monitoring by completely freeing it from the constraints of mains power. This self-contained, rechargeable battery version offers up to 6 months' autonomy, while retaining all the advanced features of the TEMP-1 system, including optional external probes (not supplied) and multimodal alerts.

Perfectly suited to temporary installations, isolated areas or nomadic applications, the TEMP-1B excels in monitoring non-powered structures such as basements, garages, recreational vehicles or sheltered outdoor installations. Its "Works With Home Assistant" certification guarantees native ESPHome integration with no compromise on performance, while its open-source design allows complete customization to specific needs.

This solution transforms inaccessible environments into intelligent monitoring points, creating an extended monitoring network without electrical infrastructure, while maintaining the accuracy and responsiveness of a permanently wired system.

This product incorporates an AHT20-F sensor for temperature and humidity measurement. Optional wired probes can be connected to the Jack input of this sensor, e.g. a food probe

Key features

Exceptional autonomy and mobility

• 6-month autonomy: 16340/CR123A rechargeable battery with intelligent energy management
• Optimized sleep modes: 12h sleep configuration for maximum battery life
• Energy monitoring: Real-time battery level and voltage monitoring via Home Assistant
• Free installation: Deploy without power constraints, ideal for isolated areas and temporary applications

Multi-sensor Mobile Monitoring System

• AHT20-F on-board sensor: ambient temperature/humidity measurement with automated temperature compensation
• Optional external hot-swap probes: waterproof DS18B20-compatible 3.5mm jack and high-temperature food-safe NTC probes*
• Specialized monitoring: cellar applications, vehicles, agricultural facilities, event monitoring
• Flexible deployment: easy repositioning as monitoring needs evolve

Intelligent Energy Management and Alerts

• Consumption optimization: Configurable reporting intervals, advanced energy-saving modes
• Visual/audible alerts: RGB LED and piezo buzzer with optimized power management
• Event-driven alarm clock: Instant triggering of critical alerts even in standby mode
• Dual power supply: USB-C for configuration/testing, battery for stand-alone deployment

Advanced wireless connectivity

• Native ESPHome integration: instant Home Assistant auto-discovery, WiFi hotspot configuration
• Long-range communication: WiFi 802.11 b/g/n optimized for installations far from the router
• Intelligent firmware: automatic network reconnection management, error recovery, OTA updates
• Secure local API: local data processing, communication encryption, privacy protection

Technical Features

Mobile and Energy-Efficient Architecture

• Microcontroller: ESP32-C3-MINI-1 with integrated battery consumption optimizations
• Power supply: 16340/CR123A rechargeable battery (not supplied) + USB-C 5V/1A configuration
• Autonomy: 6+ months 12h reporting, up to 1 year in hibernation mode
• Dimensions: 48mm × 30mm × 30mm (integrated battery compartment, compact design)
• Case: reinforced 3D architecture with easy battery access, improved waterproofing

Battery Management and Energy Monitoring

• Recommended battery: 16340/CR123A Li-ion rechargeable (Nitecore, Efest, Olight)
• External charging: Specialized charger required (Nitecore i2/i4 recommended)
• Advanced monitoring: Percentage charge, instantaneous voltage, estimated remaining autonomy
• Battery protection: Deep discharge thresholds, low battery alerts, safe shutdown

Sensor specifications and accuracy

• Main sensor: AHT20-F temperature (-40°C to +80°C, ±0.3°C) and humidity (0-100% RH)
• Compatible probes: waterproof DS18B20 (-55°C to +85°C), food-safe NTC (350°C max)*
• Modular interface: 3.5mm jack, automatic Dallas/Food switching, interchangeable probes
• Calibration: configurable temperature offsets, ESP32 thermal drift compensation

Home Assistant and Ecosystem integration

• Complete entities: Temperature/humidity, battery level, external probes, LED/buzzer controls
• Battery automations: Low-charge alerts, wake-up schedule, economy mode management
• Flexible configuration: variable reporting intervals, custom thresholds, conditional actions
• System accessories: Magnetic support, watertight probes, stainless steel feeder

Deployment and Specialized Applications

• Mobile use cases: Cellar/attic monitoring, recreational vehicles, agricultural installations, event monitoring
• Easy installation: Initial USB-C configuration, stand-alone battery deployment, optional magnetic holder
• Requirements: 16340/CR123A battery + external charger

*More about the probe

The 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 limit of use.
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).