Shelly The Pill USB-C Wi-Fi & Bluetooth Smart Sensor Hub for IoT
The Pill by Shelly is an ultra-compact USB-C (5V) powered Wi-Fi and Bluetooth device that connects to various sensors and low-voltage peripherals for monitoring and control of temperature, humidity, voltage, and digital I/O. Measuring just 26 × 20 × 8.5 mm and weighing only 3 grams, this tiny powerhouse transforms standard sensors into smart, connected devices without the need for a proprietary hub or subscription. Perfect for home automation, greenhouse monitoring, aquarium temperature tracking, and server cabinet environmental control, The Pill brings professional-grade IoT capabilities to spaces where other devices simply won't fit.
Why You'll Love The Pill by Shelly
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Ultra-Compact Design: At just 26 × 20 × 8.5 mm and 3 grams, it fits anywhere - distribution boards, enclosures, server racks, or DIY projects
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Plug-and-Play Sensor Support: Ready to use with external temperature sensors (DS18B20) or temperature & humidity sensors (DHT22) via simple 3.5mm jack connection
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Dual Connectivity: Built-in Wi-Fi 802.11 b/g/n and Bluetooth BLE 4.2 for flexible integration with your smart home ecosystem
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Bluetooth Gateway Functionality: Acts as a gateway for Shelly BLU devices and works with popular Home Automation systems such as Home Assistant
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Shelly Gen3 Functionality: Advanced automation with local actions, scripting, virtual components, MQTT, WebSocket, and HTTP integration
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Expandable & Configurable: Support for analog sensors, digital I/O, and add-ons including solid-state relays and voltage measurement up to 30V
Smart Temperature & Humidity Monitoring
The device is ready to use for temperature monitoring with plug-and-play compatibility with external temperature sensors (DS18B20) or temperature & humidity (DHT22). Connect up to five DS18B20 temperature sensors simultaneously using the optional splitter accessory. Monitor your fish tank, pool water temperature, greenhouse climate, server room conditions, or track environmental data across multiple points. Real-time readings sync to the Shelly Smart Control app with cloud logging and statistics for long-term analysis.
Advanced Automation & Integration
The Pill supports a wide range of peripheral modes and external add-ons, making it one of the most versatile compact IoT hubs available. Configure digital inputs and outputs for button triggers, motion detection, or relay control. Use the built-in voltmeter (0-2.5V) or add the external analog module to measure DC voltages up to 30V - ideal for monitoring battery levels in off-grid systems or low-voltage power supplies. Integrate seamlessly with Home Assistant, MQTT brokers, or any automation platform supporting HTTP and WebSocket protocols.
Key Technical Capabilities
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Processor: ESP32-C3 (ESP-Shelly-C38F) with 8 MB embedded flash
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Power: 5V DC via USB-C port, power consumption <1W (peaks up to 5W)
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Operating Environment: -20°C to 40°C (-5°F to 105°F), 30% to 70% RH
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Connectivity: Wi-Fi 802.11 b/g/n (2401-2483 MHz), Bluetooth BLE 4.2 (2402-2480 MHz)
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I/O Logic Level: 3.3V DC, digital outputs max current 20mA
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Voltmeter Accuracy: ±(2% + 5d)
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External Sensors: One DHT22 or up to five DS18B20
What's in the Box
- The Pill by Shelly (main device)
- USB-C to 3.5mm jack female adapter cable
- Quick start guide
Note: USB-C power cable and sensors sold separately. Compatible with DS18B20 and DHT22 sensors available as optional accessories.
Full Specifications
| Model |
The Pill by Shelly (S3SN-0U53X) |
| Dimensions |
26 × 19.95 × 8.5 mm (1.02 × 0.79 × 0.34 in) |
| Weight |
3 g (0.11 oz) |
| Power Supply |
5V DC via USB-C port |
| Power Consumption |
<1W (peaks up to 5W) |
| Operating Temperature |
-20°C to 40°C (-5°F to 105°F) |
| Operating Humidity |
30% to 70% RH |
| Wi-Fi |
802.11 b/g/n (2401-2483 MHz) |
| Bluetooth |
BLE 4.2 (2402-2480 MHz) |
| Processor |
ESP32-C3 (ESP-Shelly-C38F) with 8MB Flash |
| I/O Logic Level |
3.3V DC |
| Digital Outputs |
3.3V DC / Max current 20mA |
| Digital Inputs |
Active LOW (Low: <0.83V, High >2.48V) |
| Built-in Voltmeter |
0-2.5V DC (0-30V DC with external add-on) |
| Voltmeter Accuracy |
±(2% + 5d) |
| Supported Sensors |
One DHT22 or up to five DS18B20 |
| Configurable GPIOs |
3 configurable digital I/Os |
| Connectivity |
USB-C (power), Micro-USB output (GPIO connector for sensors) |
Specifications are sourced from the manufacturer product page and may be updated.