The Pill by Shelly

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.

It includes Shelly Gen3 functionality, acts as a gateway for Shelly BLU devices, and works with popular Home Automation systems such as Home Assistant. No more installation hassle, just plug it in and let it work.

The Pill by Shelly adds control and automation where others can't fit, linking your sensors and peripherals with smart minimalistic precision. Powered by USB-C (cable required) and designed for low-voltage use, it brings automation, monitoring, and Bluetooth Gateway functionality in the smallest possible form.

It supports a wide variety of digital or analog sensors and low-voltage actuators with external peripheral addons and configurable peripheral modes, or use a plug and play external temperature sensor (DS18B20) or temperature & humidity sensor (DHT22). The Pill uses Micro-USB on one end for accessory/sensor interfacing and USB-C for power in, and comes with a micro-USB to 3.5mm jack cable for interfacing with 3.5mm accessories. A terminal-block accessory is required for interfacing with your own sensors.

Peripheral modes include:

• Temperature (DS18B20) - Supporting up to 5x Temperature probes (DS18B20); + optional 2 Digital IO
• Temperature & Humidity - Temperature & Humidity sensor DHT22 + optional 2 Digital IO
  • Requires terminal block accessory
• Analog Input - Analog sensor input (voltmeter) + optional Digital IO
  • Measured Voltages: 0-2.5 V (default)
  • Use external add-on for 0-30V
  • Requires terminal block accessory
• Digital Input/Output - configurable for up to 3x Inputs/Outputs
  • Digital IO: 3.3 V Logic Levels
  • Digital input: Active Low (default)
  • Requires terminal block accessory
• Solid State Relay Add-on - Peripheral add-on (coming soon!) with 2x channels galvanic-isolated outputs (max 30 V / 300 mA) + optional Digital IO

*Digital I/O can be combined with all modes and setup independently as Input or Output

Key features include:

• Extremely small and lightweight device - mount it inside enclosures, behind panels, or integrate it within other devices
• Multiple input/output types support - take advantage of up to three independently configurable logic-level inputs or outputs and voltage ranges for versatile integration
• Analog Sensors Monitoring - connect 0-5V analog sensors for accurate readings of light, soil moisture, and other environmental parameters to enhance automation capabilities with an external add-on
• Bridging Peripherals to Home Automations - enable The Pill by Shelly to connect peripheral devices to your automation platform and expand system behaviour and control. Works with Home Assistant!
• Plug-and-Play Temperature Monitoring - simplify temperature and humidity sensing for DS18B20 and DHT22 sensors without complex wiring or hubs
• Acts as a Bluetooth Gateway - use The Pill by Shelly as additional gateway device for all Shelly BLU series devices
• DC Loads Control (accessory required) - Control two independent DC loads up to 30V/300mA using the external SSR add-on for reliable low-voltage switching in automation setups
• Peripheral Add-on Compatibility - expand The Pill by Shelly’s integration and control capabilities with peripheral add-ons for digital inputs, outputs, and analog sensing
• USB-C power design - save power and enable low-voltage environmental monitoring with a compact design suitable for always-on deployment
• A versatile device - use it as a standalone solution or as part of a larger system on third-party platforms

Features

• Dual connectivity: Wi-Fi and Bluetooth for versatile communication
• USB-C powered for safe and easy 5 V installation in any environment
• Built-in Bluetooth Gateway for nearby device communication
• Shelly Gen3 functionality with local actions, scripting, and virtual components for full automation control
• Sensor reader for temperature, humidity, and environmental data with cloud logging and statistics
• Advanced automation and integration via MQTT, WebSocket, HTTP, and virtual devices
• Expandable design through add-ons for digital I/O, analog sensing, and high-accuracy voltage measurement
• Configurable peripheral modes supporting a broad range of external modules and extensions
• High-accuracy analog measurement for reading DC voltages up to 30 V with the external add-on
• Three configurable digital IOs for direct logic-level control and system interfacing

Specifications

Size (H x W x D)	26 x 19.95 x 8.5 mm
Weight	3 g
Shell material	Plastic
Shell colour	White
Ambient working temperature	-20 to 40 °C
Humidity	30% - 70% RH
Power supply	5 V⎓ (from USB-C port)
Power consumption	< 1 W
Input circuits ratings
Digital inputs triggering voltage	Active LOW; Trigger low: < 0.83 V Trigger high: > 2.48 V
Digital inputs max. voltage	3.3 V
Output circuits ratings
Max. switching voltage	3.3 V (logic-level)
Max. switching current	20 mA
Sensors, meters
Voltmeter (DC)	0 V - 2.5 V (Built-in) 0 V - 30 V (Requires external add-on)
Voltmeter accuracy	±(2% + 5d)
Internal-temperature sensor	No
External sensors supported	Single DHT22 Up to five DS18B20 (with optional splitter)
Wi-Fi
Protocol	802.11 b/g/n
RF band	2401 - 2483 MHz
Max. RF power	< 20 dBm
Range	Up to 30m indoors and 50m outdoors (Depends on local conditions)
Bluetooth
Protocol	BLE 4.2
RF band	2402 - 2480 MHz
Max. RF power	< 10 dBm
Range	Up to 10m indoors and 30m outdoors (Depends on local conditions)
Microcontroller
CPU	Shelly ESP32 C3 (ESP-Shelly-C38F)
Flash	8 MB
Schedules	20
Webhooks (URL actions)	20 with 5 URLs per hook
Scripting	Yes
MQTT	Yes
Encryption	Yes
Other
Supported accessories	Cable adapter - 3.5 mm Jack (incl. in the package) Splitter 1 to 5 - 3.5 mm Jack Temperature sensor DS18B20 - 3.5 mm Jack
Supported add-ons	5-terminal Add-on SSR Add-on (coming soon!) Analog 0-30V Add-on (coming soon!)

Resources

• Shelly Product Documentation
• Printed User Guide (as found within the package)
• Declaration of Conformity
• Device Identification
  • Device name: The Pill by Shelly
  • Device number: S3SN-0U53X
  • Device SSID: ShellyPill-XXXXXXXXXXXXXX
  • Bluetooth ID: 0x1829
• EAN: 3800238073558

Handy Shelly Resources

• Shelly Cloud
• Shelly App
  • Apple App Store
  • Google Play
  • Huawei AppGallery
• Home Assistant Shelly Integration
• Shelly Community Forum
• Shelly Facebook Support Group
• Shelly Knowledgebase
• Shelly Device Finder (easy-to-use software to find Shelly devices in the local network)
• Shelly Developer API

Package Contents

• 1x The Pill by Shelly
• 1x Cable adapter - 3.5mm Jack