Add clear version of commit 72f30ad.

extras/ds18b20/ds18b20.h

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+#ifndef DRIVER_DS18B20_H_
+#define DRIVER_DS18B20_H_
+
+typedef struct {
+	uint8_t id;
+    uint8_t major;
+    uint8_t minor;
+} ds_sensor_t;
+
+// Scan all ds18b20 sensors on bus and return its amount.
+// Result are saved in array of ds_sensor_t structure.
+// Cause printf in esp sdk don`t support float,
+// I split result as two number (major, minor).
+uint8_t readDS18B20(uint8_t pin, ds_sensor_t *result);
+
+// This method is just to demonstrate how to read 
+// temperature from single dallas chip.
+float read_single_DS18B20(uint8_t pin);
+
+#endif