SKU: TH2097
Simplify multi-sensor temperature monitoring with the Adafruit DS18B20 Chainable Temperature Sensor Extender. Designed for clean 1-Wire deployments, this breakout makes it easy to connect and daisy-chain multiple DS18B20 temperature sensors using STEMMA JST PH 2mm connectors with no messy breadboard wiring required.
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Simplify multi-sensor temperature monitoring with the Adafruit DS18B20 Chainable Temperature Sensor Extender. Designed for clean 1-Wire deployments, this breakout makes it easy to connect and daisy-chain multiple DS18B20 temperature sensors using STEMMA JST PH 2mm connectors with no messy breadboard wiring required.
While DS18B20 sensors can be wired directly to a microcontroller, this extender adds structure, modularity, and easier debugging to your setup. Each board features screw terminals for quick connection of TO-92 or waterproof probe-style DS18B20 sensors, along with dual JST PH connectors that allow seamless chaining between multiple extender boards.
An onboard 4.7KΩ pull-up resistor supports standard 1-Wire operation and can be disabled by cutting a trace if your system already includes a pull-up elsewhere. A buffered red signal LED provides visual confirmation of 1-Wire data activity when it blinks, data is being transmitted.
Technical details for Adafruit DS18B20 Chainable Temperature Sensor Extender.
| Specification | Details |
|---|---|
| Supported Sensor | DS18B20 (TO-92 or Waterproof Probe Type) |
| Interface Protocol | 1-Wire |
| Input Voltage (Vin) | 3.3V to 5V (Must match microcontroller logic level) |
| Pull-Up Resistor | Onboard 4.7KΩ (Disable via trace-cut PU jumper) |
| STEMMA Connectors | 2 × JST PH 2mm 3-Pin (Chainable) |
| Terminal Block | 3-Pin Screw Terminal (V+, Signal, GND) |
| Signal Indicator | Red LED (Buffered 1-Wire activity indicator, disable via jumper) |
| Power Indicator | Green LED (Power ON indicator, disable via jumper) |
| Logic Compatibility | Compatible with 3.3V and 5V systems (Arduino, ESP32, Raspberry Pi, RP2040) |
| Chaining Support | Yes – Multiple boards can be daisy-chained via JST PH ports |
| Pin / Interface | Description |
|---|---|
| V+ | Power supply for the connected DS18B20 sensor (match microcontroller logic voltage: 3.3V or 5V). |
| Signal | 1-Wire data line connection between DS18B20 and microcontroller. |
| GND | Common ground reference for power and data. |
| Vin (STEMMA) | Power input via JST PH 2mm connector (Red wire). Supply same voltage as system logic. |
| Sig (STEMMA) | 1-Wire signal output to microcontroller via JST PH connector (White wire). |
| GND (STEMMA) | Common ground via JST PH connector (Black wire). |
| PU Jumper | Controls onboard 4.7KΩ pull-up resistor. Cut trace to disable pull-up. |
| SIG LED Jumper | Disables red 1-Wire activity LED when trace is cut. |
| ON LED Jumper | Disables green power LED when trace is cut. |
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