Shelly The Pill - compact USB-C module for sensors (WiFi Bluetooth)

The Pill by Shelly – The automation "pill" that fits where other modules can't

 

Simple Integration

The Pill by Shelly is an extremely compact low-voltage device with Wi-Fi and Bluetooth, powered by a safe 5V via USB-C. It serves as an intelligent bridge between the world of sensors/peripherals and your automation – for monitoring temperature, humidity, DC voltage, and working with digital inputs/outputs.

Thanks to its miniature dimensions, it can be easily integrated into distribution boards, enclosures, panels, server racks, or DIY projects. Check out other Shelly products.

 

Main Benefits for Smart Homes and "Makers"

• Dual Connectivity: Wi-Fi + Bluetooth for quick pairing and stable operation
• Bluetooth Gateway: Ideal as an additional gateway for nearby Shelly BLU devices
• Plug & Play Measurement: DS18B20 (temperature) or DHT22 (temperature + humidity)
• Shelly Gen3 Features: Local actions, schedules, scripting, and virtual components
• Open Integration: MQTT, WebSocket, HTTP, and virtual devices
• Expandability: Add-ons for I/O, analog measurements, and precise measuring up to 30 V DC

Peripheral Modes – Choose According to Your Use Case

• Temperature (DS18B20): Up to 5× temperature probes + optional 2× digital I/O
• Temperature & Humidity (DHT22): 1× DHT22 + optional 2× digital I/O
• Analog Input (Voltmeter): 0–2.5 V built-in; up to 0–30 V with an external add-on
• Digital Inputs/Outputs: Up to 3× configurable I/O (3.3 V logic levels), input active LOW (default)
• SSR Add-on: 2× galvanically isolated outputs (max 30 V / 300 mA) + optional digital I/O

Note: Digital I/O can be combined with all modes and set independently as Input or Output.

 

Practical Scenarios Where The Pill Shines

• Water Temperature Monitoring: Pools, aquariums, storage tanks – up to 5 measurement points simultaneously (DS18B20)
• Room/Greenhouse Climate: Measuring temperature and humidity, automation of ventilation or heating
• DC Voltage Measurement up to 30 V: 3.7 V / 12 V / 24 V batteries, UPS, and other DC distribution (with add-on)
• Reading Digital Sensors: Reed contacts, motion, water levels – connect them to your automations
• Controlling DC Loads: 2 channels up to 30 V / 300 mA via SSR add-on (LEDs, small fans, valves…)

Technical Specifications of The Pill by Shelly:

• Name: The Pill by Shelly, Model: S3SN-0U53X
• SSID: ShellyPill-XXXXXXXXXXXXXX
• Bluetooth ID: 0x1829
• Power Supply: 5 V⎓ (USB-C)
• Power Consumption: < 1 W (depends on the number of connected sensors), with one DS18B20 temperature sensor it is 0.2 W
• Dimensions (H×W×D) and Weight: 26 × 19.95 × 8.5 mm, 3 g
• Operating Temperature: −20 to 40 °C
• Operating Humidity: 30% – 70% RH
• Digital Inputs: Active LOW; Trigger low < 0.83 V / Trigger high > 2.48 V; max input voltage 3.3 V
• Digital Outputs: 3.3 V logic level; max switching current 20 mA
• Voltmeter: 0–2.5 V (built-in) / 0–30 V (external add-on); accuracy ±(2% + 5d)
• Supported External Sensors: 1× DHT22; up to 5× DS18B20
• Wi-Fi: 802.11 b/g/n (2.4 GHz)
• Bluetooth: BLE 4.2
• MCU: Shelly ESP32-C3; Flash: 8 MB
• FW Features: Schedules (20), Webhooks (20; 5 URLs/hook), Scripting, MQTT, Encryption
• Included Accessories: Adapter cable micro USB – 3.5 mm jack
• Supported Add-ons: 5-terminal Add-on, SSR Add-on, Analog 0–30 V Add-on