Differenze tra le versioni di "Arduino, ESP and 1wire thermometers"
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Riga 18: | Riga 18: | ||
[[File: TO-92_Front_with_Pin_Numbers.png|200px]] | [[File: TO-92_Front_with_Pin_Numbers.png|200px]] | ||
− | GND -> GND | + | 1 is GND -> GND |
+ | 2 is DATA -> GPIO02 on ESP | ||
+ | 3 is 3v3 -> +3V3 | ||
+ | |||
+ | The circuit also needs a 4.7K resistor between DATA e 3v3. | ||
+ | |||
+ | === Software === | ||
+ | |||
+ | Here is the source code. | ||
+ | <source lang=C> | ||
+ | #include <DallasTemperature.h> | ||
+ | |||
+ | const int led=13; | ||
+ | |||
+ | #define ONE_WIRE_BUS 2 // DS18B20 pin | ||
+ | OneWire oneWire(ONE_WIRE_BUS); | ||
+ | DallasTemperature DS18B20(&oneWire); | ||
+ | |||
+ | void setup(void){ | ||
+ | Serial.begin(115200); | ||
+ | pinMode(led, OUTPUT); | ||
+ | digitalWrite(led, 0); | ||
+ | } | ||
+ | |||
+ | void loop(void){ | ||
+ | float temp; | ||
+ | DS18B20.requestTemperatures(); | ||
+ | temp = DS18B20.getTempCByIndex(0); | ||
+ | Serial.print("Temperature: "); | ||
+ | Serial.println(temp); | ||
+ | |||
+ | delay(1000); | ||
+ | } | ||
+ | </source> |
Versione delle 09:19, 27 giu 2016
This is a simple sketch to read the current temperature from a DS18B10/DS18B20 1 wire thermometer.
I have successfully tested this program on an ESP-12 (ESP8266) using the Arduino IDE.
hardware wiring
This project uses a "console cable" (but any USB to TTL converter is okay). Using an Adafruit like cable:
Black -> GROUND While -> TXD on ESP Green -> RXD on ESP
DO NOT CONNECT THE RED PIN TO YOUR ESP! The red pin is +5V while ESP need +3V3 so either you have a step-down circuit to convert 5V to 3.3V or you'll need another power source of the right voltage for yout ESP.
The connection to the DS18B10 is simple:
1 is GND -> GND 2 is DATA -> GPIO02 on ESP 3 is 3v3 -> +3V3
The circuit also needs a 4.7K resistor between DATA e 3v3.
Software
Here is the source code.
#include <DallasTemperature.h>
const int led=13;
#define ONE_WIRE_BUS 2 // DS18B20 pin
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
void setup(void){
Serial.begin(115200);
pinMode(led, OUTPUT);
digitalWrite(led, 0);
}
void loop(void){
float temp;
DS18B20.requestTemperatures();
temp = DS18B20.getTempCByIndex(0);
Serial.print("Temperature: ");
Serial.println(temp);
delay(1000);
}