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esp32-ds18b20-ledc
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Update README.

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David Antliff 6 years ago
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@ -9,9 +9,7 @@ This is an example application for the Maxim Integrated DS18B20 Programmable Res
It supports a single or multiple devices on the same 1-Wire bus. It supports a single or multiple devices on the same 1-Wire bus.
It is written and tested for v3.0 of the [ESP-IDF](https://github.com/espressif/esp-idf) environment, using the xtensa-esp32-elf toolchain (gcc version 5.2.0, crosstool-ng-1.22.0-80-g6c4433a). It is written and tested for v3.3 of the [ESP-IDF](https://github.com/espressif/esp-idf) environment, using the xtensa-esp32-elf toolchain (gcc version 5.2.0, crosstool-ng-1.22.0-80-g6c4433a).
Support for ESP-IDF v2.1 is available on the [ESP-IDF_v2.1](https://github.com/DavidAntliff/esp32-ds18b20-example/tree/ESP-IDF_v2.1) branch.
Ensure that submodules are cloned: Ensure that submodules are cloned:
@ -20,14 +18,9 @@ Ensure that submodules are cloned:
Build the application with: Build the application with:
$ cd esp32-ds18b20-example $ cd esp32-ds18b20-example
$ make menuconfig # set your serial configuration and the 1-Wire GPIO - see below $ idf.py menuconfig # set your serial configuration and the 1-Wire GPIO - see below
$ make flash monitor $ idf.py build
$ idf.py -p (PORT) flash monitor
For version 3.2 or newer of ESP-IDF, you can build with the CMake build system:
$ $IDF_PATH/tools/idf.py menuconfig # set your serial configuration and the 1-Wire GPIO - see below
$ $IDF_PATH/tools/idf.py build
$ $IDF_PATH/tools/idf.py flash monitor
The program should detect your connected devices and periodically obtain temperature readings from them, displaying them on the console. The program should detect your connected devices and periodically obtain temperature readings from them, displaying them on the console.
@ -42,7 +35,7 @@ This application makes use of the following components (included as submodules):
To run this example, connect one or more DS18B20 devices to a single GPIO on the ESP32. Use the recommended pull-up resistor of 4.7 KOhms, connected to the 3.3V supply. To run this example, connect one or more DS18B20 devices to a single GPIO on the ESP32. Use the recommended pull-up resistor of 4.7 KOhms, connected to the 3.3V supply.
`make menuconfig` can be used to set the 1-Wire GPIO. `idf.py menuconfig` can be used to set the 1-Wire GPIO.
If you have several devices and see occasional CRC errors, consider using a 2.2 kOhm pull-up resistor instead. Also consider adding decoupling capacitors between the sensor supply voltage and ground, as close to each sensor as possible. If you have several devices and see occasional CRC errors, consider using a 2.2 kOhm pull-up resistor instead. Also consider adding decoupling capacitors between the sensor supply voltage and ground, as close to each sensor as possible.

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