Merging two codes for PZEM004T and DHT 22

[khoih]

Sorry for misunderstanding. But IMHO, I still think that you have to fix your loop() and remove the unwanted delay().

The delay() function must be used only when it’s absolutely necessary, as it’s a waste of CPU power (unless we use it as a CPU cooler ). It can create problem when we are least expected.
You can see the effect of it on the system, especially on software timers in:

Hardware Timer Interrupt

Dear @mikekgr, Have a look at example, ISR_Timer_Complex, written for specially for Blynkers, where you can use the same syntax as BlynkTimer and the library is specially written to replace software timers. You can use it if absolutely necessary for mission-critical tasks. In this example, an LED is toggled every 5000ms by an ISR-based timer. [https://github.com/khoih-prog/ESP8266TimerInterrupt/tree/master/examples/ISR_Timer_Complex] You can see the terminal output like this: Starting ESP826…

Unless you’re using a preemptive multi-tasking OS, the delay() monopolizes the CPU power, yet doing nothing. It deprives all other tasks the neccessary execution to perform normally. You can try a longer delay() in the loop() and see its unwanted effect, such as Blynk disconnection, etc…

Anyway, hereafter is the suggested code to merge DHT into PZEM:

#define USE_BLYNK_WM      0       // https://github.com/khoih-prog/Blynk_WM

#include <ArduinoOTA.h>

#if USE_BLYNK_WM
#include <BlynkSimpleEsp8266_WM.h>
#else
#include <BlynkSimpleEsp8266.h>
#endif

//#include <SimpleTimer.h>
#include <ModbusMaster.h>
#include <ESP8266WiFi.h>
#include "settingsPZEM.h"

#include <DHT.h>

#include <SoftwareSerial.h>  //  ( NODEMCU ESP8266 )
SoftwareSerial pzem(D5,D6);  // (RX,TX) connect to TX,RX of PZEM for NodeMCU
//SoftwareSerial pzem(D7,D8);  // (RX,TX) connect to TX,RX of PZEM
#include <ModbusMaster.h>
ModbusMaster node;

BlynkTimer timer;

#if !USE_BLYNK_WM
//WiFi data
char ssid[]   = "****";           //WiFi Credential
char pass[]   = "****";           //WiFi Password
char server[] = "****";           //Blynk local server IP address
int port      = 8080;             //Blynk local port

char auth[]   = "****";           //PZEM-004v3 Auth code for Blynk Local Server
#endif


double U_PR, I_PR,  P_PR,  PPR, PR_F, PR_PF, PR_alarm;
uint8_t result;  uint16_t data[6];

#define UPDATE_INTERVAL_MS      5000

// Use 0 or 1 when you don't need to debug with many messages
#define DEBUG_LOOP              2

#define MODBUS_ID               1

#define DHTTYPE     DHT11     // DHT 11
//#define DHTTYPE     DHT22   // DHT 22, AM2302, AM2321
//#define DHTTYPE     DHT21   // DHT 21, AM2301

#define DHTPIN        D2        // Using pin D2 for DHTxx

DHT dht(DHTPIN, DHTTYPE);

// Change according to your Blynk App design 
#define vPIN_VOLTAGE              V0
#define vPIN_CURRENT_USAGE        V1
#define vPIN_ACTIVE_POWER         V2
#define vPIN_ACTIVE_ENERGY        V3
#define vPIN_FREQUENCY            V4
#define vPIN_POWER_FACTOR         V5
#define vPIN_OVER_POWER_ALARM     V6

#define DHT_TEMP                  V7
#define DHT_HUMIDITY              V8 

float humidDHT;
float tempDHT;

// This function sends Arduino's up time every second to Virtual Pin (5).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void readSensor()
{
  float h  = dht.readHumidity();
  float t  = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
 
  if (isnan(h) || isnan(t)) 
  {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  humidDHT  = h;
  tempDHT   = t;
}

void updateBlynk() 
{
  getPZEM();

  readSensor();
 
  Blynk.virtualWrite(vPIN_VOLTAGE,               U_PR);
  Blynk.virtualWrite(vPIN_CURRENT_USAGE,         I_PR);
  Blynk.virtualWrite(vPIN_ACTIVE_POWER,          P_PR);
  Blynk.virtualWrite(vPIN_ACTIVE_ENERGY,         PPR);
  Blynk.virtualWrite(vPIN_FREQUENCY,             PR_F);
  Blynk.virtualWrite(vPIN_POWER_FACTOR,          PR_PF);
  Blynk.virtualWrite(vPIN_OVER_POWER_ALARM,      PR_alarm);

  Blynk.virtualWrite(DHT_TEMP, tempDHT);
  Blynk.virtualWrite(DHT_HUMIDITY, humidDHT);
}

uint8_t getPZEM()
{
  result = node.readInputRegisters(0x0000, 10);
  
  if (result == node.ku8MBSuccess)  
  {
    U_PR      = (node.getResponseBuffer(0x00)/10.0f);
    I_PR      = (node.getResponseBuffer(0x01)/1000.000f);
    P_PR      = (node.getResponseBuffer(0x03)/10.0f);
    PPR       = (node.getResponseBuffer(0x05)/1000.0f);
    PR_F      = (node.getResponseBuffer(0x07)/10.0f);
    PR_PF     = (node.getResponseBuffer(0x08)/100.0f);
    PR_alarm  = (node.getResponseBuffer(0x09));

    #if (DEBUG_LOOP > 0)
    Serial.print("U_PR:     "); Serial.println(U_PR);   // V
    Serial.print("I_PR:     "); Serial.println(I_PR,3); //  A
    Serial.print("P_PR:     "); Serial.println(P_PR);   //  W 
    Serial.print("PPR:      "); Serial.println(PPR,3);  // kWh
    Serial.print("PR_F:     "); Serial.println(PR_F);   // Hz
    Serial.print("PR_PF:    "); Serial.println(PR_PF);  
    Serial.print("PR_alarm: "); Serial.println(PR_alarm,0);
    Serial.println("====================================================");
    #endif   
  }
  #if (DEBUG_LOOP > 0)
  else
    Serial.println("PZEM: can't get data");
  #endif
  
  return result;
}

void setup()
{
  Serial.begin(115200); 
  Serial.println("\nStart serial"); 
  pzem.begin(9600); 
  Serial.println("Start PZEM serial");
  node.begin(MODBUS_ID, pzem);  
  Serial.println("Start PZEM"); // 1 = ID MODBUS

  dht.begin();
  Serial.println("Started DHT");
  
  #if USE_BLYNK_WM
    Blynk.begin();
  #else
    WiFi.begin(ssid, pass);
    
    #if USE_LOCAL_SERVER
      Blynk.config(auth, server, BLYNK_HARDWARE_PORT);
    #else
      Blynk.config(auth);
    #endif
    
    Blynk.connect();
    if ( Blynk.connected())
      Serial.println("Connected to Blynk");   
  #endif
    
  ArduinoOTA.setHostname(OTA_HOSTNAME);
  ArduinoOTA.begin();
  
  timer.setInterval(UPDATE_INTERVAL_MS, updateBlynk);
}

void loop()
{
  Blynk.run();  
  timer.run();
  ArduinoOTA.handle();
}

Certainly, you can do it your way, and use this as an example how to merge.

Good luck again,