Purpose:
This project based on the DS18B20 - ESP32 one Wire Bus Application video and blog ESP32 one Wire Bus Application – DS18B20 section article, to use ESP32 to send the temperature of DS18B20 to Node-RED through the serial port. Three modes are designed in the code, DS18B20_ON, DS18B20_OFF and Node-RED modes.
Fundamental:
Node-RED 是 IBM 以 Node.js 為基礎，開發出來的視覺化 IOT 開發工具
透過「流程圖」方式的操作,透過 Node-RED 完成許多後端才能做的事情.
YouTube Demo:
透過「流程圖」方式的操作,透過 Node-RED 完成許多後端才能做的事情.
一、Install Node-RED (Windows下)
1. Go to Node.js ：https://nodejs.org/en/，download recommended file.
2.Install (node-v18.17.1-x64.msi，檔案不大，大約30MB)
3.Verify Node.Js and NPM version
4.Input npm install -g --unsafe-perm node-red Install Node-RED
5. Key-In node-red start node-red service
6.打開瀏覽器，網址列輸入 http://127.0.0.1:1880/，就可以打開 Node-RED，左邊是一些功能流程的節點，每個節點都有各自的功能，中間的區域就是讓我們透過這些節點組成流程圖。
ESP32 Code Introduction:
#include <OneWire.h>
#include <DallasTemperature.h>
#include <BluetoothSerial.h>
//--------- Flag structure --------------------------------------
typedef struct _vFlag
{
uint8_t BTFlag = 0;
uint8_t DC_Flag = 0;
uint8_t CANFlag = 0;
uint8_t I2C_Flag = 0;
uint8_t BMP180Flag = 0;
uint8_t DS18B20Flag = 0;
uint8_t JSONFlag = 0;
uint8_t LEDFlag = 1;
uint8_t sensor_Flag = 0;
uint8_t sensor1_Flag = 0;
uint8_t initial_Flag = 0;
uint8_t FunctionFlag = 3;
uint8_t SendFlag = 0;
uint8_t BMPCnt = 0;
} vFlag;
vFlag *flag_Ptr;
vFlag flag;
//----- DS18B20 ------------------
#define DQ_Pin 4
OneWire oneWire(DQ_Pin);
DallasTemperature sensors(&oneWire);
byte data[12]; // buffer for data
byte address[8]; // 64 bit device address
#define LED_BUILTIN 2
BluetoothSerial SerialBT;
//----------uart--------------
#define LINE_BUFFER_LENGTH 64
//--------- uart structure --------------------------------------
typedef struct _vUart
{
char c;
int lineIndex = 0;
int line1Index = 0;
int BTlineIndex = 0;
bool lineIsComment;
bool lineSemiColon;
//char *line;
char line[128];
//char line1[128];
char BTline[20];
//char R_line[20];
//char L_line[20];
String inputString;
String BTinputString;
String S1inputString;
int V[16];
char ctemp[30];
char I2C_Data[80];
int DC_Spped = 50;
float Voltage[16];
int Buffer[128];
int StartCnt = 0;
int ReadCnt = 0;
int sensorValue = 0;
} vUart;
vUart *Uart_Ptr;
vUart Uart;
//-------------------------------------------------
void setup()
{
Serial.begin(9600);
Serial.println(F("init"));
pinMode(LED_BUILTIN, OUTPUT);
SerialBT.begin("BT_BS18B20");// BTName
if (oneWire.search(address))
{
Serial.println("Slave device found!");
Serial.print("Device Address = ");
Serial.println(address[0]);
}
else
{
Serial.println("Slave device not found!");
}
//-----DS-----------
sensors.begin();
}
//-----------------------------------------
void loop()
{
Serial.print(F("Main at core:"));
Serial.println(xPortGetCoreID());
while(1)
{
if(flag.LEDFlag == 1)
{
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
vTaskDelay(300);
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
vTaskDelay(300);
}
while (Serial.available() > 0)
{
Uart.c = Serial.read();
if ((Uart.c == '\n') || (Uart.c == '\r'))
{ // End of line reached
if (Uart.lineIndex > 0)
{ // Line is complete. Then execute!
Uart.line[Uart.lineIndex] = '\0'; // Terminate string
processCommand(Uart.line); // do something with the command
SerialBT.println(Uart.line);
Uart.lineIndex = 0;
Uart.inputString = "";
}
else
{
// Empty or comment line. Skip block.
}
Uart.lineIsComment = false;
Uart.lineSemiColon = false;
Serial.println(F("ok>"));
}
else
{
//Serial.println( c );
if ((Uart.lineIsComment) || (Uart.lineSemiColon))
{
if (Uart.c == ')')
Uart.lineIsComment = false; // End of comment. Resume line.
}
else
{
if (Uart.c == '/')
{ // Block delete not supported. Ignore character.
}
else if (Uart.c == '~')
{ // Enable comments flag and ignore all characters until ')' or EOL.
Uart.lineIsComment = true;
}
else if (Uart.c == ';')
{
Uart.lineSemiColon = true;
}
else if (Uart.lineIndex >= LINE_BUFFER_LENGTH - 1)
{
Serial.println("ERROR - lineBuffer overflow");
Uart.lineIsComment = false;
Uart.lineSemiColon = false;
}
else if (Uart.c >= 'a' && Uart.c <= 'z')
{ // Upcase lowercase
Uart.line[Uart.lineIndex] = Uart.c - 'a' + 'A';
Uart.lineIndex = Uart.lineIndex + 1;
Uart.inputString += (char)(Uart.c - 'a' + 'A');
}
else
{
Uart.line[Uart.lineIndex] = Uart.c;
Uart.lineIndex = Uart.lineIndex + 1;
Uart.inputString += Uart.c;
}
}
}
} //while (Serial.available() > 0)
while (SerialBT.available())
{
String BTdata = SerialBT.readString();
Serial.println(BTdata);
BTprocessCommand(BTdata);
}//while (BT.available())
if(flag.DS18B20Flag == 1)
{
vDS18B20Task();
}
if(flag.DS18B20Flag == 2)
{
vNodeRedTask();
}
}
}
//-------------------------------------
void BTprocessCommand(String data)
{
}
//----------------------------------------
void processCommand(char *data)
{
int len, xlen, ylen, zlen, alen;
int tempDIO;
String stemp;
len = Uart.inputString.length();
//---------------------------------------
if (strstr(data, "VER") != NULL)
{
Serial.println(F("ESP32_20230710"));
}
if (strstr(data, "DS18B20_ON") != NULL)
{
flag.DS18B20Flag = 1;
Serial.println(F("DS18B20_ON"));
}
if (strstr(data, "NODE-RED") != NULL)
{
flag.DS18B20Flag = 2;
Serial.println(F("NODE-RED"));
}
if (strstr(data, "DS18B20_OFF") != NULL)
{
flag.DS18B20Flag = 0;
Serial.println(F("DS18B20_OFF"));
}
}
//-----------------------------------------
//-------------------------------------------
void vNodeRedTask()
{
//Serial.print("Temperatures --> ");
sensors.requestTemperatures();
Serial.println(sensors.getTempCByIndex(0));
}
//-------------------------------------------
void vDS18B20Task()
{
Serial.print("Temperatures --> ");
sensors.requestTemperatures();
Serial.println(sensors.getTempCByIndex(0));
}
//-------------------------------------------
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