Node-RED UI人機介面 控制LED並將LED狀態 展示於UI的Text 與Gauge上
利用 Node-RED UI人機介面控制 Esp8266(ESP32) 內建LED,
Node-RED UI(輸入) 送出MQTT 發行的訊息 ,Esp8266(ESP32)訂閱MQTT 訊息解讀MQTT的訊息,控制LED ON/OFF/Flash .
Esp8266(ESP32)將LED ON/OFF/Flash的訊息發行到MQTT . Node-RED UI去訂閱MQTT 訊息,並解讀MQTT的訊息,將LED訊息顯示在UI的Text 與 Gauge上.
==============ESP8266(ESP32)程式=======================
/*
Many thanks to nikxha from the ESP8266 or WEMOSD1 forum
*/
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
//const char *ssid = "PTS-2F";
//const char *pass = "PTS6662594";
const char *ssid = "74170287";
const char *pass = "24063173";
//const char *ssid = "alex9ufo";
//const char *pass = "alex9981";
//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 "alex9981" //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
#define BUILTIN_LED 2 // Arduino standard is GPIO13 but lolin nodeMCU is 2
//Variables
long lastMsg = 0;
char jsonChar[100];
bool Flash = false; //true
char LEDStatus =10; // LED Status 0:off , 1:on , 2:Flash
bool mqtt_pub = false; //true
String LED_StBuf="";
//=============================================================================
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/outTopic/RFID/json", jsonChar, MQTTpubQos, true); // true means retain
// ... and resubscribe
client.subscribe("alex9ufo/inTopic", 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;
//String message;
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
Serial.println(message);
String message1;
for (int i = 0; i < length; i++) {
message1 = message1 + (char)payload[i]; //Conver *byte to String
}
//=============================================
if(message1 == "#on")
{
digitalWrite(BUILTIN_LED,LOW);
Flash = false;
LEDStatus =1;
} //LED on
//=============================================
if(message1 == "#off")
{
digitalWrite(BUILTIN_LED,HIGH);
Flash = false;
LEDStatus =0;
} //LED off
//=============================================
if(message1== "#flash") {
Flash = true;
digitalWrite(BUILTIN_LED, HIGH);
LEDStatus =2;
} // if(message== "#flashLED")
}
//======================================================
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);
}
//======================================================
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();
long now = millis();
if (Flash)
{
digitalWrite(BUILTIN_LED, !digitalRead(BUILTIN_LED));
delay(500);
}
//=========================================
if (now - lastMsg > 6000) {
lastMsg = now;
LED_StBuf="";
if (LEDStatus ==1)
{
LED_StBuf="#onLED";
mqtt_pub = true;
}
else if (LEDStatus ==0)
{
LED_StBuf="#offLED";
mqtt_pub = true;
}
else if (LEDStatus ==2)
{
LED_StBuf="#flashLED";
mqtt_pub = true;
}
else
{
LED_StBuf="";
mqtt_pub = false;
}
if (mqtt_pub == true)
{
// Convert data to JSON string
String json =
"{\"LED_Status\":\"" + LED_StBuf + "\"}";
// Convert JSON string to character array
json.toCharArray(jsonChar, json.length()+1);
if (client.connected()) {
Serial.print("Publish message: ");
Serial.println(json);
// Publish JSON character array to MQTT topic
client.publish("alex9ufo/outTopic",jsonChar);
}
} // if (mqtt_pub == true)
} //if (now - lastMsg > 6000)
} //Loop
//======================================================
==============Node-RED程式========
[{"id":"115e0d36.7a7f03","type":"switch","z":"c2a1bdb4.b5abd","name":"","property":"payload","propertyType":"msg","rules":[{"t":"cont","v":"#onLED","vt":"str"},{"t":"cont","v":"#offLED","vt":"str"},{"t":"cont","v":"#flashLED","vt":"str"}],"checkall":"true","repair":false,"outputs":3,"x":230,"y":360,"wires":[["f604e09f.858b9","10194fe8.69862"],["1e8d531b.fff50d","483195f4.1582ec"],["e3e49b4a.431128","8ce7c6fb.370d18"]]},{"id":"314565fd.ffae8a","type":"debug","z":"c2a1bdb4.b5abd","name":"","active":true,"tosidebar":true,"console":false,"complete":"false","x":670,"y":260,"wires":[]},{"id":"399977ad.848d28","type":"debug","z":"c2a1bdb4.b5abd","name":"","active":true,"console":"false","complete":"false","x":670,"y":420,"wires":[]},{"id":"82b84307.0e453","type":"mqtt out","z":"c2a1bdb4.b5abd","name":"MQTT_pub","topic":"alex9ufo/inTopic","qos":"","retain":"","broker":"40bf4d5e.0395f4","x":630,"y":200,"wires":[]},{"id":"2cedadb4.d43fa2","type":"mqtt in","z":"c2a1bdb4.b5abd","name":"MQTT_sub","topic":"alex9ufo/outTopic","qos":"2","broker":"40bf4d5e.0395f4","x":80,"y":420,"wires":[["ea9b5561.7180f8","115e0d36.7a7f03"]]},{"id":"2aee0421.3a9eac","type":"switch","z":"c2a1bdb4.b5abd","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"#on","vt":"str"},{"t":"eq","v":"#off","vt":"str"},{"t":"eq","v":"#flash","vt":"str"}],"checkall":"true","repair":false,"outputs":3,"x":270,"y":220,"wires":[["6f1e9ac9.184a14"],["2b83bdbb.ddb752"],["3e483b6d.875494"]]},{"id":"6f1e9ac9.184a14","type":"function","z":"c2a1bdb4.b5abd","name":"#on","func":"msg.payload =\"#on\";\nreturn msg;\n","outputs":1,"noerr":0,"x":430,"y":180,"wires":[["82b84307.0e453","314565fd.ffae8a"]]},{"id":"2b83bdbb.ddb752","type":"function","z":"c2a1bdb4.b5abd","name":"#off","func":"msg.payload =\"#off\";\nreturn msg;\n","outputs":1,"noerr":0,"x":430,"y":220,"wires":[["82b84307.0e453","314565fd.ffae8a"]]},{"id":"1e8d531b.fff50d","type":"function","z":"c2a1bdb4.b5abd","name":"#off","func":"msg.payload =\"LED@off\";\nreturn msg;\n","outputs":1,"noerr":0,"x":450,"y":360,"wires":[["399977ad.848d28","33293e07.4d5d52"]]},{"id":"f604e09f.858b9","type":"function","z":"c2a1bdb4.b5abd","name":"#on","func":"msg.payload =\"LED@on\";\nreturn msg;\n","outputs":1,"noerr":0,"x":450,"y":320,"wires":[["33293e07.4d5d52","399977ad.848d28"]]},{"id":"28323aef.0d3836","type":"ui_gauge","z":"c2a1bdb4.b5abd","name":"","group":"385a9af3.d72756","order":0,"width":0,"height":0,"gtype":"gage","title":"Gauge","label":"units","format":"{{value}}","min":0,"max":10,"colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":650,"y":520,"wires":[]},{"id":"33293e07.4d5d52","type":"ui_text","z":"c2a1bdb4.b5abd","group":"385a9af3.d72756","order":0,"width":0,"height":0,"name":"","label":"text","format":"{{msg.payload}}","layout":"row-center","x":630,"y":360,"wires":[]},{"id":"10194fe8.69862","type":"function","z":"c2a1bdb4.b5abd","name":"#on","func":"msg.payload =\"10\";\nreturn msg;\n","outputs":1,"noerr":0,"x":490,"y":480,"wires":[["28323aef.0d3836"]]},{"id":"483195f4.1582ec","type":"function","z":"c2a1bdb4.b5abd","name":"#off","func":"msg.payload =\"0\";\nreturn msg;\n","outputs":1,"noerr":0,"x":490,"y":520,"wires":[["28323aef.0d3836"]]},{"id":"ee87dd36.57b85","type":"ui_button","z":"c2a1bdb4.b5abd","name":"","group":"385a9af3.d72756","order":0,"width":0,"height":0,"passthru":false,"label":"OFF_LED","color":"black","bgcolor":"","icon":"fa-circle-o","payload":"#off","payloadType":"str","topic":"","x":80,"y":220,"wires":[["2aee0421.3a9eac"]]},{"id":"1963c7fc.004458","type":"ui_button","z":"c2a1bdb4.b5abd","name":"","group":"385a9af3.d72756","order":0,"width":0,"height":0,"passthru":false,"label":"ON_LED","color":"white","bgcolor":"","icon":"fa-circle","payload":"#on","payloadType":"str","topic":"","x":80,"y":180,"wires":[["2aee0421.3a9eac"]]},{"id":"3488e387.a47c8c","type":"ui_button","z":"c2a1bdb4.b5abd","name":"","group":"385a9af3.d72756","order":0,"width":0,"height":0,"passthru":false,"label":"Flash_LED","color":"red","bgcolor":"","icon":"fa-circle-o","payload":"#flash","payloadType":"str","topic":"","x":90,"y":260,"wires":[["2aee0421.3a9eac"]]},{"id":"3e483b6d.875494","type":"function","z":"c2a1bdb4.b5abd","name":"#flash","func":"msg.payload =\"#flash\";\nreturn msg;\n","outputs":1,"noerr":0,"x":430,"y":260,"wires":[["82b84307.0e453","314565fd.ffae8a"]]},{"id":"e3e49b4a.431128","type":"function","z":"c2a1bdb4.b5abd","name":"#flash","func":"msg.payload =\"LED@flash\";\nreturn msg;\n","outputs":1,"noerr":0,"x":450,"y":400,"wires":[["33293e07.4d5d52","399977ad.848d28"]]},{"id":"8ce7c6fb.370d18","type":"function","z":"c2a1bdb4.b5abd","name":"#flash","func":"msg.payload =\"5\";\nreturn msg;\n","outputs":1,"noerr":0,"x":490,"y":560,"wires":[["28323aef.0d3836"]]},{"id":"ea9b5561.7180f8","type":"debug","z":"c2a1bdb4.b5abd","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":270,"y":500,"wires":[]},{"id":"40bf4d5e.0395f4","type":"mqtt-broker","broker":"broker.mqtt-dashboard.com","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":15,"cleansession":true,"birthQos":"0","willQos":"0"},{"id":"385a9af3.d72756","type":"ui_group","z":"","name":"Default","tab":"33a2f8d4.7049d8","disp":true,"width":"6","collapse":false},{"id":"33a2f8d4.7049d8","type":"ui_tab","z":"","name":"ESP8266_LED","icon":"dashboard"}]
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