lf-ds18b20

A reusable, interrupt-safe DS18B20 1-Wire temperature sensor driver library for the Raspberry Pi Pico / Pico 2 (RP2040 and RP2350 microcontrollers) using the Pico C SDK.

Features

• Interrupt-Safe Bit-Banging: Temporarily disables interrupts during the exact data-sampling phase of the 1-Wire protocol to prevent multicore scheduling and timer interrupts from corrupting communications.
• Maxim 1-Wire CRC-8 Checking: Validates the scratchpad data on read to guarantee temperature values are free from transmission noise.
• Decoupled & Standalone: Zero external dependencies other than standard Pico SDK packages, making it ready to be integrated into larger projects or used by itself.

Pinout & Connections

Make sure to place a 4.7\text{k}\Omega pull-up resistor between the DS18B20 data pin and the 3.3\text{V} line.

DS18B20 Pin	Pico GPIO Pin	Description
VCC	3V3 OUT	3.3V Power supply
GND	GND	Ground connection
DQ (Data)	GP2	1-Wire Data line (Default in example)

Standalone Compilation

To compile the standalone example project:

mkdir build
cd build
cmake -DPICO_PLATFORM=rp2350 -DPICO_BOARD=pico2 ..
make

Flash the generated ds18b20_example.uf2 binary to your Pico 2.

Integrating as a Submodule / Subdirectory

You can drop this repository into your project directory (e.g. under drivers/lf-ds18b20) and add it to your root CMakeLists.txt:

add_subdirectory(drivers/lf-ds18b20)

target_link_libraries(my_project_name
    lf_ds18b20
)

This registers the static library target lf_ds18b20 and handles header include paths automatically.