Help with a pan+tilt flow and arduino ino to add a relay

General
1

I have gone brain dead...I have a nod-red flow and an arduino iso that I DID NOT WRITE but am trying to add a simple relay to them to switch cameras output to my system. The bad thing is I did it many weeks ago and it all worked...However my SD card crashed on the PI3b+ and I had not backed it up.(yes,my bad) I did try to recover but after a week I gave up and rebuilt all.So I now have a working PI and all new Flow and arduino code But I can't get the relay to work now...I have loaded the Flow and code below (I Hope) for someone to take a look and give me some pointers. I noted in the code lines I added. all work but the relay.Thank you
Ron.

ARDUINO CODE

 /*
 * Node-RED + MQTT + ESP8266 + PTZ servo kit (Pan-Tilt)
 * How to move pan-tilt system with Node-RED - MQTT and ESP8266
 * - Use Node-RED UI Dashboard to move Pan and Tilt servos
 * - Node-RED sequencer : scan Pan and tilt 
 * - Node-RED reset position to 90°/90°
 * 
 * Comment déplacer le système pan-tilt avec Node-RED - MQTT et ESP8266
 * - Utilisez le tableau de bord Node-RED UI pour dĂ©placer les servos Pan et Tilt
 * - SĂ©quenceur Node-RED: balayage panoramique (Pan) et inclinaison (Tilt)
 * - Reset des positions depuis Node-RED (90°/90°)
 * - Tutoriel complet
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Licence : MIT
 * Copyright (C) 2017 : www.projetsdiy.fr and www.diyprojects.io
 */
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Servo.h> 
Servo pan; 
Servo tilt;

// Paramètre WiFi, MQTT - WiFi, MQTT parameters
const char* ssid = "my ssid";                // WiFi SSID
const char* password = "my password";        // WiFi Password
const char* mqtt_server = "192.168.0.5";  // IP Broker MQTT
const char* topic_pan = "servo/pan";          // Topic MQTT pour servo Pan - Topic MQTT for Pan servor
const char* topic_tilt = "servo/tilt";        // Topic MQTT pour servo Tilt - Topic MQTT for Tilt servor
//ron added two lines
const char* topic_cam1 =" cam1";
const char* topic_cam2 = "cam2";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

void setup() {

  Serial.begin(115200);
  //ron added 1 line
  pinMode(D1,OUTPUT);
  pan.attach(D2);
  tilt.attach(D3);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
 String string;
 // Affiche le topic entrant - display incoming Topic
 Serial.print("Message arrived [");
 Serial.print(topic);
 Serial.print("] ");
 // décode le message - decode payload message
 for (int i = 0; i < length; i++) {
 string+=((char)payload[i]); 
 }
 // Affiche le message entrant - display incoming message
 Serial.print(string);
 Serial.print(" toInt ");
 // Conversion de la position en entier - convert position as an Integer
 int pos = string.toInt(); 
 Serial.println(pos);

 // Détermine quel servo doit être bougé - Determines which servo should be moved
 if ( strcmp(topic, topic_pan) == 0 ) {
 Serial.print("Move Pan to ");
 Serial.println(pos);
 pan.write(pos); 
 }
 if ( strcmp(topic, topic_tilt) == 0 ) {
 Serial.print("Move Tilt to ");
 Serial.println(pos);
 tilt.write(pos); 
 }
 //ron added 4 lines
 if ((char)payload[0] == '1'){
  digitalWrite(D1, HIGH);
 }
 if ((char)payload[0] == '2'){
 digitalWrite(D1, LOW);
 
 delay(15); 
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP8266Client")) {
      Serial.println("connected");
      client.subscribe(topic_pan); 
      client.subscribe(topic_tilt);
      //ron added 2 lines
      client.subscribe(topic_cam1);
      client.subscribe(topic_cam2); 
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}
void loop() {   
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  delay(100);
}

NODE-RED FLOW

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        "id": "4fc50ee3e29bd9b2",
        "type": "tab",
        "label": "P+T",
        "disabled": false,
        "info": ""
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        "id": "34545562.076d7a",
        "type": "mqtt out",
        "z": "4fc50ee3e29bd9b2",
        "name": "",
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        "qos": "1",
        "retain": "false",
        "respTopic": "",
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        "broker": "ceed5755.206c58",
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        "order": 4,
        "width": 6,
        "height": 1,
        "passthru": true,
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        "min": 0,
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        "label": "position ",
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        "wires": []
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    {
        "id": "3a393dcd.afa272",
        "type": "comment",
        "z": "4fc50ee3e29bd9b2",
        "name": "ESP8266 MQTT Pan Tilt PTZ Control Servo",
        "info": "",
        "x": 390,
        "y": 900,
        "wires": []
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        "id": "4316c9.3c84a938",
        "type": "mqtt out",
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        "topic": "servo/tilt",
        "qos": "1",
        "retain": "false",
        "respTopic": "",
        "contentType": "",
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        "expiry": "",
        "broker": "ceed5755.206c58",
        "x": 640,
        "y": 400,
        "wires": []
    },
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        "id": "9087f6a0.b7e938",
        "type": "ui_slider",
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        "name": "",
        "label": "Tilt",
        "group": "9c59c1e2.8235f",
        "order": 5,
        "width": 6,
        "height": 1,
        "passthru": true,
        "topic": "",
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        "wires": [
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        "order": 7,
        "width": 6,
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        "gtype": "donut",
        "title": "Tilt servo position ",
        "label": "position ",
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        "wires": []
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        "group": "9c59c1e2.8235f",
        "order": 1,
        "width": 0,
        "height": 0,
        "passthru": false,
        "label": "Reset",
        "tooltip": "",
        "color": "",
        "bgcolor": "",
        "icon": "fa-undo",
        "payload": "",
        "payloadType": "str",
        "topic": "",
        "topicType": "str",
        "x": 90,
        "y": 500,
        "wires": [
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                "743cd12b.d31b5"
            ]
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        "type": "mqtt out",
        "z": "4fc50ee3e29bd9b2",
        "name": "",
        "topic": "servo/tilt",
        "qos": "1",
        "retain": "false",
        "respTopic": "",
        "contentType": "",
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        "correl": "",
        "expiry": "",
        "broker": "ceed5755.206c58",
        "x": 480,
        "y": 520,
        "wires": []
    },
    {
        "id": "743cd12b.d31b5",
        "type": "function",
        "z": "4fc50ee3e29bd9b2",
        "name": "Pan (90°) - Tilt(90°)",
        "func": "msg.payload = 90;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 270,
        "y": 540,
        "wires": [
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        "name": "www.projetsdiy.fr | www.diyprojects.io",
        "info": "# Version française \nwww.projetsdiy.fr\n\n# English version\nwww.diyprojects.io",
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        "order": 2,
        "width": 6,
        "height": 1,
        "label": "Scan Pan",
        "color": "",
        "icon": "",
        "payload": "-10",
        "payloadType": "num",
        "topic": "",
        "x": 140,
        "y": 120,
        "wires": [
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        "outputs": 1,
        "noerr": 0,
        "x": 330,
        "y": 120,
        "wires": [
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        "type": "delay",
        "z": "4fc50ee3e29bd9b2",
        "name": "",
        "pauseType": "delay",
        "timeout": "500",
        "timeoutUnits": "milliseconds",
        "rate": "1",
        "nbRateUnits": "1",
        "rateUnits": "second",
        "randomFirst": "1",
        "randomLast": "5",
        "randomUnits": "seconds",
        "drop": false,
        "x": 500,
        "y": 120,
        "wires": [
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    },
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        "passthru": false,
        "label": "Scan Tilt",
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        "timeout": "500",
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        "nbRateUnits": "1",
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        "label": "cam2",
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        "type": "mqtt-broker",
        "broker": "localhost",
        "port": "1883",
        "clientid": "",
        "usetls": false,
        "compatmode": true,
        "keepalive": "60",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "willTopic": "",
        "willQos": "0",
        "willPayload": ""
    },
    {
        "id": "9c59c1e2.8235f",
        "type": "ui_group",
        "name": "PTZ Servo Control",
        "tab": "84e11c13.a96e9",
        "order": 2,
        "disp": true,
        "width": "12",
        "collapse": false
    },
    {
        "id": "84e11c13.a96e9",
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]
2

Please go back and edit your post so as to properly format both codes. Thanks.

Use the </> icon in the editor and place the code in-between the triple backticks.

image

3

Hello Gunner
Ok I think I did that now. Thanks for the tip. Ron.

4

Delete this from the end your node-red code. The last character should be a ] this will make is easier for someone to copy-paste into their own NR for testing.

As for your issue... do you have any coding experience with either Arduino or Node-Red?

I don't think anyone will write your Arduino code for you... but you should be able to Google and read through some MQTT how-too web pages to understand a clearer way to publish and subscribe to topics so as to make them easier to interpret on the Arduino side.

I would suggest adding in some print statements so you can track what your code is seeing (in the incoming subscriptions) and doing

5

Is this the example you followed the first time?

Why not follow it again?

1 Like
6

I guess you didn't read all the first post yes I have a lot experience with both node-red and arduino. I did what I need to do a couple weeks ago but I can't seem to get it back as I had it before I had lost all my files on the crashed SD card. I had many examples I used over several years but alas they are all gone. a better question would have been do I have any experience with this forum, Then no I don't I have not needed to ask for help before. I did not expect for someone to write my code just point out what I am not doing right. But thank you for the tips on using the forum. Ron.

7

Sir I did follow the the code but it does not include a relay now does it .I said the pan and tilt all work just not the added relay.

8

How about adding a serial print in the IF statements doing the digitalWrite(D1,HIGH) and LOW so you can see if it is getting to that area in the arduino code?

9

because I see what I am sending in the node-red debug window when I click the cam1 or 2 button from a second pc from the node-red dashboard. you mean in the arduino serial mon.? I'll try it. Thanks.

10

Yes, put some debugging in the arduino code so you can follow/see what is happening there.

11

Yes I read it... all I saw is that you didn't write the code you want modified. If you have experience, then just modify it :stuck_out_tongue:

Yes I could do it, but I am not going to rewrite some 3rd party code for another 2nd party post, particularly here as it is little to do with NR and mostly about Arduino coding.

What I did do is suggest you add in some tracking code (print statements), as did @zenofmud, so you can better follow what that other code is doing... thus determine best how to modify it yourself.

I also recommend using the same format of topic/sub topic for your relay as is for your servos. Keeping consistent makes for easier coding.

I have something like this in my current Arduino/MQTT tests (NOT complete code, just snippets from my own specific use case)

// Once connected, publish an announcement...
      client.publish("test/led", "0");
      // ... and subscribe
      client.subscribe("test/led");
      client.subscribe("test/time"); // Arduino code not currently using this
      client.subscribe("test/CPU"); // Arduino code not currently using this
      client.subscribe("test/relay");

// Interprets and processes incoming aubscriptions
void callback(char* topic, byte* payload, unsigned int length) {

  if (strncmp(topic, "test/relay", strlen("test/relay")) == 0) {
    Serial.print("RELAY Command Detected!");
    uint8_t relayValue = payload[0] - '0';  // Get payload of relay sub after stripping closing character
    digitalWrite(14, relayValue);
  }

  if (strncmp(topic, "test/led", strlen("test/led")) == 0) {
    Serial.print("LED Command Detected!");
    uint8_t LEDValue = payload[0] - '0';  // Get payload of LED sub after stripping closing character
    digitalWrite(2, !LEDValue);
  }

  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}
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