Node-RED + MQTT + ESP32 LED Control
Node-RED UI介面 控制ESP32 Build in LED
1.ON , 2. OFF , 3. FLASH , 4. Timer ON 5 SEC
1) ESP32 Arduino 程式
#include <WiFi.h>
#include <PubSubClient.h>
#include <SPI.h>
#define BUILTIN_LED 2
// Update these with values suitable for your network.
//const char *ssid = "PTS-2F";
//const char *pass = "PTS6662594";
//const char *ssid = "WBR-2200";
//const char *pass = "0226452362";
const char *ssid = "74170287";
const char *pass = "24063173";
//const char *ssid = "yourSSID"; // change according to your Network - cannot be longer than 32 characters!
//const char *pass = "yourPASSWORD"; // change according to your Network
#define MQTTid "" //id of this mqtt client
#define MQTTip "broker.mqtt-dashboard.com" //ip address or hostname of the mqtt broker
#define MQTTport 1883 //port of the mqtt broker
#define MQTTuser "alex9ufo" //username of this mqtt client
#define MQTTpsw "alex1234" //password of this mqtt client
//#define MQTTuser "your_username" //username of this mqtt client
//#define MQTTpsw "your_password" //password of this mqtt client
#define MQTTpubQos 2 //qos of publish (see README)
#define MQTTsubQos 1 //qos of subscribe
//Variables
long lastMsg = 0;
char jsonChar[100];
String IDNo_buf="";
bool Flash = false; //true
bool Timer = false; //true
int Count= 0;
//=============================================================================
boolean pendingDisconnect = false;
void mqttConnectedCb(); // on connect callback
void mqttDisconnectedCb(); // on disconnect callback
void mqttDataCb(char* topic, byte* payload, unsigned int length); // on new message callback
WiFiClient wclient;
PubSubClient client(MQTTip, MQTTport, mqttDataCb, wclient);
//=============================================================================
void mqttConnectedCb() {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("alex9ufo/led/led_event/json", jsonChar, MQTTpubQos, true); // true means retain
// ... and resubscribe
client.subscribe("alex9ufo/led/led_event", MQTTsubQos);
}
//=============================================================================
void mqttDisconnectedCb() {
Serial.println("disconnected");
}
//=============================================================================
void mqttDataCb(char* topic, byte* payload, unsigned int length) {
/*
you can convert payload to a C string appending a null terminator to it;
this is possible when the message (including protocol overhead) doesn't
exceeds the MQTT_MAX_PACKET_SIZE defined in the library header.
you can consider safe to do so when the length of topic plus the length of
message doesn't exceeds 115 characters
*/
char* message = (char *) payload;
message[length] = 0;
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
Serial.println(message);
String s = message;
s.trim();
// Switch on the LED if an 1 was received as first character
if (s == "OFF") {
digitalWrite(BUILTIN_LED, LOW); // Turn the LED on (Note that LOW is the voltage level
// but actually the LED is on; this is because
Serial.println("Received OFF , Send LOW TO BuildIn_LED");
Flash = false;
Timer = false;
}
if (s == "ON") {
digitalWrite(BUILTIN_LED, HIGH); // Turn the LED off (Note that HIGH is the voltage level
// but actually the LED is on; this is because
Serial.println("Received ON , Send HIGH TO BuildIn_LED");
Flash = false;
Timer = false;
}
if (s == "FLASH") {
digitalWrite(BUILTIN_LED, HIGH); // Turn the LED off (Note that HIGH is the voltage level
// but actually the LED is on; this is because
Serial.println("Received FLASH , Flashing BuildIn_LED ");
Flash = true;
Timer = false;
} //if (message[0] == '2')
if (s == "TIMER") {
digitalWrite(BUILTIN_LED, HIGH); // Turn the LED off (Note that HIGH is the voltage level
// but actually the LED is on; this is because
Serial.println("Received TIMER , BuildIn_LED ON 5 SEC");
Flash = false;
Timer = true;
Count= 10;
} //if (message[0] == '2')
}
//======================================================
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
//======================================================
void setup() {
Serial.begin(115200);
setup_wifi();
pinMode(BUILTIN_LED, OUTPUT);
Serial.println(F("Booting...."));
}
//======================================================
void process_mqtt() {
if (WiFi.status() == WL_CONNECTED) {
if (client.connected()) {
client.loop();
} else {
// client id, client username, client password, last will topic, last will qos, last will retain, last will message
if (client.connect(MQTTid, MQTTuser, MQTTpsw, MQTTid "/status", 2, true, "0")) {
pendingDisconnect = false;
mqttConnectedCb();
}
}
} else {
if (client.connected())
client.disconnect();
}
if (!client.connected() && !pendingDisconnect) {
pendingDisconnect = true;
mqttDisconnectedCb();
}
}
//======================================================
void loop() {
process_mqtt();
if (Flash)
{
digitalWrite(BUILTIN_LED, !digitalRead(BUILTIN_LED));
delay(500);
}
if (Timer)
{
digitalWrite(BUILTIN_LED, HIGH);
delay(500);
Count=Count-1;
if (Count == 0 ){
Timer=false;
digitalWrite(BUILTIN_LED, LOW);
}
}
} //Loop
//======================================================
下載程式點
http://www.mediafire.com/file/c3alg5x86lmdnx7/ESP32_MQTT_LED.ino/file
PubSubClient.h 程式庫下載點
2) Node-RED 程式
http://127.0.0.1:1880
http://127.0.0.1:1880/ui
程式下載點
http://www.mediafire.com/file/b6haw3ovwy0apxs/flows_ESP32_LED.json/file
3) LINE 程式修改 發行權杖
msg.headers = {'content-type':'application/x-www-form-urlencoded','Authorization':'Bearer A4wwPNh2WqB7dlfeQyyIAwtggn1kfZSI5LkkCdia1gB'};
msg.payload = {"message":msg.payload};
return msg;
上面的紅字 需改成自己的發行權杖
請參考 https://alex9ufoexploer.blogspot.com/2020/10/line-notify.html
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