Servo control with nano and hc06

Official Hardware Nano Family Nano 33 IoT
1

hello, I want to control a servo motor using an arduino nano connected with an HC-06 module. I manage to connect with my android and I use an application with a slider to move the servo between 0° and 180°. the problem is that when i vary the slider, the servo moves from left to right a few degrees and returns to its initial position at 90°. Here is the code I used:

#include<SoftwareSerial.h>
#include<Servo.h>
Servo x;
int bttx=2;    //tx of bluetooth module is connected to pin 9 of arduino
int btrx=3;    //rx of bluetooth module is connected to pin 10 of arduino
SoftwareSerial bluetooth(bttx,btrx);
void setup()
{
  x.attach(9);        // servo is connected to pin 11 of arduino
  Serial.begin(9600);
  bluetooth.begin(9600);
}
void loop()
{
  if(bluetooth.available()>0)    //if bluetooth module is transmitting data
  {
    int pos=bluetooth.read(); // store the data in pos variable
    Serial.println(pos);
    x.write(pos);             //move servo head to the given position
  }
}

Screenshot_2022-11-11-12-52-34-619_com.keuwl.arduinobluetooth
Screenshot_2022-11-11-12-52-34-619_com.keuwl.arduinobluetooth2340×1080 162 KB

2

First, check the system by sending known ASCII Coded positional values (like: 65 degrees, 75 degrees, etc.) from Android Phone and then switch over to the Slider. This is know the cause of the problem that you have reported.

3

Thank you for answering.
if I add this line
x.write(10);
at the beginning of the void loop, the servo is positioned correctly. How can I make my application send data in ASCII? can I "translate" to ASCII in my code?