Device identification
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Device name: The Pill by Shelly
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Device model: S3SN-0U53X
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Device SSID: ShellyPill-XXXXXXXXXXXXXX
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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, supporting wide variety of digital or analog sensors and low-voltage actuators with external peripheral addons and configurable peripheral modes.
Main features
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Compact design
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USB-C powered (5V)
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Dual connectivity (WiFi & Bluetooth)
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Plug and play: Temperature monitoring (DS18B20/DHT22)
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Advanced peripheral modes - Digital Input/Output; Analog input (Voltage meter);
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External Peripheral Add-ons: SSR Dual-channel, Analog Voltage measurement (0-30V)
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Shelly Gen3 capabilities (Local actions, Schedules, Scripting, Virtual components)
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Bluetooth Gateway for Shelly BLU devices
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3rd party integrations-ready (MQTT, WebSocket, HTTP)
Peripheral modes
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Temperature (DS18B20) - Supporting up to 5 x Temperature probes (DS18B20); + optional 2 Digital IO
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Temperature & Humidity - 1x Temperature & Humidity sensor DHT22 + optional 2 Digital IO
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Analog Input - Analog sensor input (voltmeter) + optional Digital IO. Measured Voltages: 0-2.5 V (default); external Add-on for 0-30V
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Digital Input/Output - configurable for up to 3x Inputs/Outputs ; Digital IO: 3.3 V Logic Levels; Digital input: Active Low (default).
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Solid State Relay Add-on - Peripheral Addon with 2x channels galvanic-isolated outputs (max 30 V / 300 mA) + optional Digitial IO
* Note: Digital I/O can be combined with all modes and setup independently as Input or Output
Use cases
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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 a room, server cabinets, greenhouse, warehouses or other areas where keeping optimal environment condition is necessary, with the supported external sensor DHT22 -
Digital Sensors Readings
Connect simple digital sensors like door reed, motion, water state sensor 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
Analog sensor voltage measuring for popular hobby & industrial analog sensors with 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 like led indicators, small fans, solenoids, valves and etc. with additionally available external SSR Add-on -
External Systems Control
Available Digital Input/Outputs allow switching and reading state of external controllers and systems (3.3V logic level). The optionally available SSR Add-on allows triggering inputs of external controllers (max 30 V / 300 mA).
Main applications
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Residential
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University/college
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Hobby
Integrations
…
Simplified internal schematics
Device electrical interfaces
Power supply
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USB-C power supply: +5 V⎓
Add-on interface
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DC Power Supply: +5 V⎓
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Input/Output 1 - Configurable:
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1-Wire (DS18B20, DHT22)
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Digital Input
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Digital Output
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Analog Input (Voltmeter)
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Input/Output 2 - Configurable:
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Digital Input
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Digital Output
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Input/Output 3 - Configurable:
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Digital Input
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Digital Output
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GND
Connectivity and protocols
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Wi-Fi
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Bluetooth
User interface
Inputs
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One (Control) button
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Press and hold for 5 seconds to enable Device access point and Bluetooth connection.
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Press and hold for 10 seconds to factory reset the Device.
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Outputs
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LED indication
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Blue light: Device is in AP mode. Red light: STA mode is active, but the device is not connected to a Wi-Fi network.
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Yellow light: STA mode is active, and the device is connected to a Wi-Fi network but not connected to the Shelly Cloud, or the Shelly Cloud is disabled.
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Green light: STA mode is active, and the device is connected to both a Wi-Fi network and the Shelly Cloud.
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Purple light: Device is connected to a Zigbee network.
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Flashing Purple light: Device is in Zigbee pairing mode.
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Flashing Red/Blue light: OTA update is in progress.
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Rapid Flashing White light x2: Device is in IR pairing mode.
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Rapid Flashing Green light ×2: Config saved
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Rapid Flashing Red light ×2: Config unsuccessful/ timeout
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Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (HxWxD): | 26 x 19.95 x 8.5 mm / 1.02 x 0.79 x 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) |
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| Voltmeter accuracy: | ±(2% + 5d) |
| Internal-temperature sensor: | No |
| External sensors supported: |
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| Radio | |
| Wi-Fi | |
| Protocol: | 802.11 b/g/n |
| RF band: | 2401 - 2483 МHz |
| 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 МHz |
| Max. RF power: | < 10 dBm |
| Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors |
| Microcontroller unit | |
| CPU: | Shelly ESP32 C3 (ESP-Shelly-C38F) |
| Flash: | 8MB |
| Firmware capabilities | |
| Schedules: | 20 |
| Webhooks (URL actions): | 20 with 5 URLs per hook |
| Scripting: | Yes |
| MQTT: | Yes |
| Encryption: | Yes |
| Other: | Supported Accessories:
Supported add-ons:
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Components and APIs
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This device
Compliance
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The Pill by Shelly multilingual EU declaration of conformity 253 2025-12-11.pdf
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The Pill by Shelly UK PSTI ACT statement of compliance 253 2025-12-11.pdf
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The Pill by Shelly UKCA declaration of conformity 253 2025-12-11.pdf
Printed user guide
Compatible accessories
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Cable adapter - 3.5 mm Jack (included)
