DS18B20 driver for ESP8266.
Full featured DS18B20 digital thermometer driver.
Before you can get the temperature from DS18B20 you have to call
esp_ds18b20_init. You need to call it only once unless you change the GPIO
pin setup somewhere else in your code.
To find device(s) on the OneWire bus you can use esp_ds18b20_search which
will give you linked list of esp_ow_device devices.
It's up to the user to release memory allocated for the linked list with
library provided helper function esp_ds18b20_free_list when it's not needed
anymore.
Most of the operations with the DS18B20 library is based on passing pointers
to the esp_ow_device structure which has pointer to esp_ds18b20_st
status structure. The esp_ds18b20_st keeps track of last scratch pad read
the last temperature conversion.
esp_ow_device *device;
esp_ds18b20_st *st = device->custom;
If you already know the ROM address of your device you can use
esp_ds18b20_new_dev:
uint8_t rom[8] = {0x28, 0x1D, 0x39, 0x31, 0x2, 0x0, 0x0, 0xF0}
esp_ow_dev *device = esp_ds18b20_new_dev(rom);
With DS18B20 temperature measurement takes between 94 and 750ms depending on resolution. You don't want to block the CPU for that long waiting for example using some kind of delay. That's why library is using event bus (esp_eb) to emmit events when the temperature conversion is ready to read. Check example program to see how it should be done.
See driver documentation in esp_ds18b20.h header file for more details.