Pcf8574 with telegram bot

Projects Programming
1

Hi need help with the coding.

#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include "PCF8574.h"

// Wifi network station credentials
#define WIFI_SSID "xxx"
#define WIFI_PASSWORD "xxx"
// Telegram BOT Token (Get from Botfather)
#define BOT_TOKEN "xxx"

PCF8574 pcf8574_1(0x20);

const unsigned long BOT_MTBS = 1000; // mean time between scan messages

X509List cert(TELEGRAM_CERTIFICATE_ROOT);
WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);
unsigned long bot_lasttime; // last time messages' scan has been done

const int RelayPins[] = {P0, P1, P2, P3, P4, P5, P6, P7,}; // Array of relay pins
const int NumRelays = sizeof(RelayPins) / sizeof(RelayPins[0]);
int RelayStatus[NumRelays] = {0}; // Array to store relay statuses

void handleNewMessages(int numNewMessages)
{
  Serial.print("handleNewMessages ");
  Serial.println(numNewMessages);

  for (int i = 0; i < numNewMessages; i++)
  {
    String chat_id = bot.messages[i].chat_id;
    String text = bot.messages[i].text;

    String from_name = bot.messages[i].from_name;
    if (from_name == "")
      from_name = "Guest";

    for (int j = 0; j < NumRelays; j++)
    {
      if (text == "/Relay" + String(j) + "on")
      {
        pcf8574_1.digitalWrite(RelayPins[j], HIGH); // turn the Relay on (HIGH is the voltage level)
        RelayStatus[j] = 1;
        bot.sendMessage(chat_id, "Relay " + String(j) + " is ON", "");
      }

      if (text == "/Relay" + String(j) + "off")
      {
        RelayStatus[j] = 0;
        pcf8574_1.digitalWrite(RelayPins[j], LOW); // turn the Relay off (LOW is the voltage level)
        bot.sendMessage(chat_id, "Relay " + String(j) + " is OFF", "");
      }

      if (text == "/status" + String(j))
      {
        if (RelayStatus[j])
        {
          bot.sendMessage(chat_id, "Relay " + String(j) + " is ON", "");
        }
        else
        {
          bot.sendMessage(chat_id, "Relay " + String(j) + " is OFF", "");
        }
      }
    }

    if (text == "/start")
    {
      String welcome = "Welcome to Relay Control, " + from_name + ".\n";
      welcome += "This is Relay switching Bot.\n\n";
      for (int j = 0; j < NumRelays; j++)
      {
        welcome += "/Relay" + String(j) + "on : to switch Relay " + String(j) + " ON\n";
        welcome += "/Relay" + String(j) + "off : to switch Relay " + String(j) + " OFF\n";
        welcome += "/status" + String(j) + " : Returns current status of Relay " + String(j) + "\n\n";
      }
      bot.sendMessage(chat_id, welcome, "Markdown");
    }
  }
}

void setup()
{
  Serial.begin(115200);
  Serial.println();

  for (int i = 0; i < NumRelays; i++)
  {
    pcf8574_1.pinMode(RelayPins[i], OUTPUT); // initialize digital RelayPins as outputs.
    pcf8574_1.digitalWrite(RelayPins[i], LOW); // initialize pins as off (LOW is the voltage level)
  }

  // attempt to connect to Wifi network:
  configTime(0, 0, "pool.ntp.org");      // get UTC time via NTP
  secured_client.setTrustAnchors(&cert); // Add root certificate for api.telegram.org
  Serial.print("Connecting to Wifi SSID ");
  Serial.print(WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.print("\nWiFi connected. IP address: ");
  Serial.println(WiFi.localIP());

  // Check NTP/Time, usually it is instantaneous and you can delete the code below.
  Serial.print("Retrieving time: ");
  time_t now = time(nullptr);
  while (now < 24 * 3600)
  {
    Serial.print(".");
    delay(100);
    now = time(nullptr);
  }
  Serial.println(now);
}

void loop()
{
  if (millis() - bot_lasttime > BOT_MTBS)
  {
    int numNewMessages = bot.getUpdates(bot.last_message_received + 1);

    while (numNewMessages)
    {
      Serial.println("got response");
      handleNewMessages(numNewMessages);
      numNewMessages = bot.getUpdates(bot.last_message_received + 1);
    }

    bot_lasttime = millis();
  }
}

I am using this code but the code is not working.Even if i am getting the response that relay is off but the relay is not turning off.

2

Hi, @suvrajitbiswas
Welcome to the forum.
Thanks for using code tags. :+1:

What is your project supposed to do?
What does your project do?

Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.

Have you written your code in stages?
Have you code that JUST controls the relay(s) that works?
Have you code that JUST communicates with telegram that works?

Thanks.. Tom... :grinning: :+1: :coffee: :australia:

3

My project is supposed to control relay switching. Yes I have done testing in step by step manner. I am no able to control by pcf8574