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2.1 KiB
2.1 KiB
ESP32-DS18B20
Introduction
This is a ESP32-compatible C library for the Maxim Integrated DS18B20 Programmable Resolution 1-Wire Digital Thermometer device.
It supports multiple devices on the same 1-Wire bus.
It is written and tested for the ESP-IDF environment, using the xtensa-esp32-elf toolchain (gcc version 5.2.0).
Features
This library includes:
- External power supply mode (parasitic mode not yet supported).
- Static (stack-based) or dynamic (malloc-based) memory model.
- No globals - support any number of 1-Wire buses simultaneously.
- 1-Wire device detection and validation, including search for multiple devices on a single bus.
- Addressing optimisation for a single (solo) device on a bus.
- 1-Wire bus operations including multi-byte read and write operations.
- CRC checks on ROM code and temperature data.
- Programmable temperature measurement resolution (9, 10, 11 or 12-bit resolution).
- Temperature conversion and retrieval.
Documentation
Automatically generated API documentation (doxygen) is available here.
Source Code
The source is available from GitHub.
License
The code in this project is licensed under the MIT license - see LICENSE for details.
Links
- DS18B20 Datasheet
- 1-Wire Communication Through Software
- 1-Wire Search Algorithm
- Espressif IoT Development Framework for ESP32
Acknowledgements
Parts of this code are based on references provided to the public domain by Maxim Integrated.
"1-Wire" is a registered trademark of Maxim Integrated.
Roadmap
The following features are anticipated but not yet implemented:
- Simultaneous temperature conversion from multiple devices on the same bus - concurrency.
- Alarm support.
- EEPROM support.
- Parasitic power support.
- FreeRTOS event-based example.