Using Grove Servo with SIM800C GSM Module

[account6042]

Hello, I am trying to make a weather station powered by two solar cells that follow the sun with two grove servomotors, but it does not work. I determined that the problem is that the servomotors do not work at all when the gsm module is connected, but separately they work just fine. What is the problem?

#include <NeoSWSerial.h>
#include "LowPower.h"
#include "DHT20.h"
#include "U8g2lib.h"
#include "Seeed_BMP280.h"
#include "Servo.h"
Servo servoA;
Servo servoB;

int leftL;
int leftR;
int rightL;
int rightR;
int waittime = 50;
int resetThreshold =100;
int lightlevel = 0;
const int analogInPin = A4;
uint8_t count = 0;
int BatteryValue = 0;
float outputValue = 0;
int button_state = 0;
int value = 0;


bool sendTemperature = false;
bool sendHumidity = false;
bool sendPressure = false;
bool sendAltitude = false;
bool sendBatV = false;
bool sendLight = false;
bool sleepon = false;  // Flag for sleep mode
bool previousSleepState = false;
 // Flag to turn off sleep mode
NeoSWSerial sim800(8, 7); // RX, TX

void setup() {
  sim800.begin(9600); // SIM800C baud rate
  delay(1000);
   sim800.println("AT+CMGF=1"); 
    delay(500);
    sim800.println("AT+CNMI=1,2,0,0,0"); 


 


  
   servoA.attach(3);
  servoB.attach(2);
  servoA.write(60);
  servoB.write(60); 
}

void loop() {
  if (sim800.available()) {
      String receivedMessage = sim800.readStringUntil('\n');
      receivedMessage.trim();
      processReceivedSMS(receivedMessage);
    }




    leftL = analogRead(A0);
  leftR = analogRead(A1) ;
  rightL =analogRead(A3);
  rightR = analogRead(A2);
  lightlevel = (leftR + leftL + rightL + rightR) / 4;
  

  if (lightlevel < resetThreshold) {
    while (servoA.read() != 60 || servoB.read() != 60) {
      if (servoA.read() >60) {
        servoA.write(servoA.read() - 1);
      } 
      else {
        servoA.write(servoA.read() + 1);
      }

      if ( servoB.read() > 60) {
        servoB.write(servoB.read() - 1);
      } 
      else {
        servoB.write(servoB.read() + 1);
      }

      delay(waittime);
    }

   // while (lightlevel < resetThreshold) {
   //   delay(waittime);
    //  leftL = analogRead(A1);
    //  leftR = analogRead(A2) - 80;
   //   value = map(analogRead(A4),800, 1023, 0, 1023); 
    //   rightL = value;
   //   rightR = analogRead(A3);
   //   lightlevel = (leftR + leftL + rightL + rightR) / 4;
   //   monitorButtonAndDisplay();
      
    }
  
  else
  {
  while (abs(leftL - leftR) > 2000|| abs(rightL - rightR) > 2000)
   {
    if (leftL > leftR) {
      servoA.write(servoA.read() + 1);
       if(servoA.read() > 100 ) {servoA.write(servoA.read() - 1);}
    } else {
      servoA.write(servoA.read() - 1);
      if(servoA.read() < 20 ) {servoA.write(servoA.read() +1); }
    }

    if (rightL > rightR) {
      servoB.write(servoB.read() + 1);
      if(servoB.read() > 100 ) {servoB.write(servoB.read() - 1);}
    } else {
      servoB.write(servoB.read() - 1);
      if(servoB.read() < 20 ) {servoB.write(servoB.read()  +1); }
    }

    delay(waittime);
    leftL = analogRead(A0);
    leftR = analogRead(A1) ; 
    rightL = analogRead(A3);
    rightR = analogRead(A2);
 
  
  }
  }
  
}
void processReceivedSMS(String smsContent) {
  sendTemperature = false;
  sendHumidity = false;
  sendPressure = false;
  sendAltitude = false;
  sendLight = false;
  sendBatV = false;
  if (smsContent.indexOf("SendTemperature") != -1) 
  {
    sendTemperature = true;
  }
  if (smsContent.indexOf("SendHumidity") != -1)
   {
    sendHumidity = true;
  }
  if (smsContent.indexOf("SendPressure") != -1) {
    sendPressure = true;
  }
  
  if (smsContent.indexOf("SleepOn") != -1) {
    sleepon = true; // Set sleep mode flag
  
  }

  if (smsContent.indexOf("SleepOff") != -1) {
     // Set flag to turn off sleep mode
    sleepon = false;
    
  }
  if (smsContent.indexOf("SendLight") != -1)
   {
    sendLight = true;
  }
  if (smsContent.indexOf("SendAltitude") != -1)
   {
    sendAltitude = true;
  }
  if (smsContent.indexOf("sendBat") != -1)
   {
    sendBatV = true;
  }
  if (sendTemperature || sendHumidity || sendPressure ||  sendLight || sendAltitude || sendBatV) {
    String response = F("Sensor Readings:\n");
  
    if (sendTemperature) {
      response += F("Temperature:C\n");
    }
    if (sendHumidity) {
      response += F("Humidity:%\n");
    }
    if (sendPressure) {
      response += F("Pressure: atm\n");
    }
    if(sendLight)
    {
      response += F("Lightlevel: \n");
    }
    if(sendAltitude)
    {
      response += F("Altitude: m") ;
    }
    if(sendBatV)
    {
      response += F("Bat Voltage: V\n");
    }
   

    sim800.println("AT+CMGF=1"); 
    delay(500);
    sim800.print("AT+CMGS=\"+40752189030\"\r"); 
    sim800.println();
    delay(500);

     if (previousSleepState != sleepon) { 
        previousSleepState = sleepon;
         String statusMessage = " ";
         
        if (sleepon) {
            statusMessage = F("STATUS:OFFLINE\n");
        } else {
            statusMessage = F("STATUS:ONLINE\n");
        }
        delay(1000);
        sim800.println(statusMessage);
         sim800.write(char(26));
        
     }
       sim800.println(response);
       sim800.write(char(26)); 



    if(sleepon == true)
    {
      delay(500);
      
      LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); 
      
    }
  }
}