The Pill By Shelly

The Pill by Shelly

The Pill by Shelly with cable.jpg

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, supporting wide variety of digital or analog sensors and low-voltage actuators with external peripheral addons and configurable peripheral modes.

Main features

  • Compact design

  • USB-C powered (5V)

  • Dual connectivity (WiFi & 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 x Temperature probes (DS18B20); + optional 2 Digital IO

  • Temperature & Humidity - 1x 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 3x Inputs/Outputs ; Digital IO: 3.3 V Logic Levels; Digital input: Active Low (default).

  • 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

  • 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

  • Residential

  • University/college

  • Hobby

 

Integrations

…

Simplified internal schematics

the-pill-internal-schematics.png

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 (Access Point) enabled and Wi-Fi disabled:
      1 second ON / 1 second OFF

    • Wi-Fi enabled, but not connected to a Wi-Fi network:
      1 second ON / 3 seconds OFF

    • Connected to a Wi-Fi network:
      Constantly ON

    • Cloud is 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 second OFF

    • Button pressed and held for 5 seconds:
      ½ second ON / ½ second OFF

    • Button presses and held for 10 seconds:
      ¼ second ON / ¼ second OFF

The list above starts with the initial device status and the lowest priority. Every next state cancels the previous one.

 

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)

  • 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 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
(Depends on local conditions)

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:

  • Cable adapter - 3.5mm Jack (incl. in the package)

  • Spliter 1 to 5 - 3.5mm Jack

  • Temeprature sensor DS18B20 - 3.5mm jack

Supported add-ons:

  • 5-terminal Add-on

  • SSR Add-on

  • Analog 0-30V Add-on

 

Components and APIs

Compliance

The Pill by Shelly multilingual EU declaration of conformity 253 2025-12-11.pdf

The Pill by Shelly UK PSTI ACT statement of compliance 253 2025-12-11.pdf

The Pill by Shelly UKCA declaration of conformity 253 2025-12-11.pdf

Printed user guide

The Pill by Shelly multilingual printed user and safety guide.pdf

Installation guides