Device identification
- Device name: The Pill by Shelly
- Device model: S3SN-0U53X
- Device SSID: ShellyPill-XXXXXXXXXXXXXX
- Bluetooth ID: 0x1829
Short description
The Pill by Shelly is a compact multi-purpose low-voltage Wi-Fi & Bluetooth device, powered by only 5V via USB-C. The small form factor allows it to fit conveniently into any space-constraint environment.
The device is ready to use for temperature monitoring with plug-and-play compatibility with external temperature sensors (DS18B20) or temperature & humidity (DHT22). Additionally, it supports a wide variety of digital or analog sensors and low-voltage actuators with external peripheral add-ons and configurable peripheral modes.
Main features
- Compact design
- USB-C powered (5V)
- Dual connectivity (Wi-Fi & Bluetooth)
- Plug and play: Temperature monitoring (DS18B20/DHT22)
- Advanced peripheral modes – Digital Input/Output; Analog input (Voltage meter)
- External Peripheral Add-ons: SSR Dual-channel, Analog Voltage measurement (0–30V)
- Shelly Gen3 capabilities (Local actions, Schedules, Scripting, Virtual components)
- Bluetooth Gateway for Shelly BLU devices
- 3rd party integrations-ready (MQTT, WebSocket, HTTP)
Peripheral modes
- Temperature (DS18B20) – Supporting up to 5 × Temperature probes (DS18B20); + optional 2 Digital IO
- Temperature & Humidity – 1× Temperature & Humidity sensor DHT22; + optional 2 Digital IO
- Analog Input – Analog sensor input (voltmeter); + optional Digital IO. Measured Voltages: 0–2.5 V (default); external Add-on for 0–30V
- Digital Input/Output – Configurable for up to 3× Inputs/Outputs; Digital IO: 3.3 V Logic Levels; Digital input: Active Low (default)
- Solid State Relay Add-on – Peripheral Addon with 2× channels galvanic-isolated outputs (max 30 V / 300 mA); + optional Digital IO
Note: Digital I/O can be combined with all modes and set up independently as Input or Output.
Use cases
Water Temperature Monitoring
Track temperature of pools, aquariums, water tanks, and reservoirs with simultaneous monitoring of up to five temperature points using external temperature sensor probes (DS18B20).Temperature and Humidity Monitoring
Monitor temperature and humidity in rooms, server cabinets, greenhouses, warehouses, or other areas where maintaining optimal environmental conditions is essential, using the supported external sensor DHT22.Digital Sensors Readings
Connect simple digital sensors like door reed switches, motion detectors, or water state sensors to your home automation system.DC Voltage Monitoring – External Add-on available
Monitor DC voltages up to 30 V with the external Analog 0–30 V Add-on, suitable for tracking voltage across various battery systems (3.7 V, 12 V, 24 V) or other DC power lines.Analog Sensor Measurements – External Add-on available
Measure analog sensor voltages for popular hobby and industrial analog sensors using the available Analog 0–30 V Add-on.Control DC Loads – External Add-on available
Dual-channel control for small DC loads up to 30 V / 300 mA (e.g., LED indicators, small fans, solenoids, valves), with the additional SSR Add-on.External Systems Control
Available Digital Input/Outputs allow switching and reading the state of external controllers and systems (3.3V logic level). The optionally available SSR Add-on enables triggering inputs of external controllers (max 30 V / 300 mA).
Main applications
- Residential
- University/College
- Hobby
Integrations
...
Simplified internal schematics
Device electrical interfaces
Power supply
- USB-C power supply: +5 V⎓
Add-on interface
- DC Power Supply: +5 V⎓
- Input/Output 1 – Configurable:
- 1-Wire (DS18B20, DHT22)
- Digital Input
- Digital Output
- Analog Input (Voltmeter)
- Input/Output 2 – Configurable:
- Digital Input
- Digital Output
- Input/Output 3 – Configurable:
- Digital Input
- Digital Output
- GND
Connectivity and protocols
- Wi-Fi
- Bluetooth
User interface
Inputs
- One (Control) button
- Press and hold for 5 seconds to enable Device access point and Bluetooth connection.
- Press and hold for 10 seconds to factory reset the device.
Outputs
- LED (monocolor) indication:
- AP enabled and Wi-Fi disabled: 1 second ON / 1 second OFF
- Wi-Fi enabled but not connected: 1 second ON / 3 seconds OFF
- Connected to Wi-Fi network: Constantly ON
- Cloud enabled but not connected: 1 second ON / 5 seconds OFF
- Connected to Shelly Cloud: Constantly ON
- OTA (Over the Air Update): ½ sec ON / ½ sec OFF
- Button pressed and held for 5 seconds: ½ sec ON / ½ sec OFF
- Button pressed and held for 10 seconds: ¼ sec ON / ¼ sec OFF
Note: The list starts with the initial device status and lowest priority. Each subsequent state cancels the previous one.
Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (H×W×D) | 26 × 19.95 × 8.5 mm / 1.02 × 0.79 × 0.34 inch |
| Weight | 3 g / 0.11 oz |
| Shell material | Plastic |
| Shell color | White |
| Environmental | |
| Ambient working temperature | -20 to 40 °C / -5 to 105 °F |
| Humidity | 30 % – 70 % RH |
| Electrical | |
| Power supply | 5 V⎓ (from USB Type-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 Addon) |
| Voltmeter accuracy | ±(2% + 5d) |
| Internal temperature sensor | No |
| External sensors supported | single DHT22 up to five DS18B20 |
| Radio | |
| Wi-Fi | |
| Protocol | 802.11 b/g/n |
| RF band | 2401 – 2483 MHz |
| Max. RF power | < 20 dBm |
| Range | Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (depends on local conditions) |
| Bluetooth | |
| Protocol | BLE 4.2 |
| RF band | 2402 – 2480 MHz |
| Max. RF power | < 10 dBm |
| Range | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors (depends on local conditions) |
| Microcontroller unit | |
| CPU | Shelly ESP32 C3 (ESP-Shelly-C38F) |
| Flash | 8 MB |
| Firmware capabilities | |
| Schedules | 20 |
| Webhooks (URL actions) | 20 with 5 URLs per hook |
| Scripting | Yes |
| MQTT | Yes |
| Encryption | Yes |
| Other | Supported Accessories: - Cable adapter – 3.5mm Jack (included in package) - Splitter 1 to 5 – 3.5mm Jack - Temperature sensor DS18B20 – 3.5mm jack Supported add-ons: - 5-terminal Add-on - SSR Add-on - Analog 0–30V Add-on |
Components and APIs
- This device
- All Shelly devices and services
Compliance
- The Pill by Shelly multilingual EU declaration of conformity
- The Pill by Shelly UK PSTI ACT statement of compliance
- The Pill by Shelly UKCA declaration of conformity
Printed user guide
Installation guides
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