Description

Stepper motor control x bluetooth and app

In this tutorial we will see a circuit, which controls a stepper motor, with an application made in app inventor, using bluetooth, and the hc-05 module and arduino.

Electronic components

Arduino mini pro

The Arduino Pro Mini is a microcontroller board based on the ATmega328 .

It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, an integrated resonator, a reset button, and holes for mounting pin headers. A six-pin header can be connected to an FTDI cable or a Sparkfun breakout board to provide USB power and communication to the board.

The Arduino Pro Mini is designed for semi-permanent installation on objects or exhibits. The board comes without pre-mounted headers, allowing the use of various types of connectors or direct soldering of wires. The pin layout is compatible with the Arduino Mini.

There are two versions of the Pro Mini. One runs at 3.3V and 8 MHz, the other at 5V and 16 MHz.

hc-05 modules

Works as a bluetooth master and slave device

Configurable via AT commands

Bluetooth V2.0+EDR

Operating frequency: 2.4 GHz ISM band

Modulation: GFSK (Gaussian Frequency Shift Keying)

Transmit power: <=4dBm, Class 2

Sensitivity: <=-84dBm @ 0.1% BER

Security: Authentication and encryption

Bluetooth profiles: Bluetooth serial port.

Distance of up to 10 meters in optimal conditions

Operating Voltage: 3.6 VDC to 6 VDC

Current Consumption: 30 mA to 50 mA

Chip: BC417143

Version or firmware: 3.0-20170609

Default Baud: 38400

Supported baud rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200.

Interface: Serial TTL

Antenna: Integrated into the PCB

Security: Authentication and encryption (Default password: 0000 or 1234)

Working temperature (Max): 75°C

Working temperature (Min): -20°C

Dimensions: 4.4 x 1.6 x 0.7 cm

Stepper motor 28BYJ-48

The parameters of this stepper motor are:

Model: 28BYJ-48 – 5V

Nominal voltage: 5V (or 12V, value indicated on the back).

Number of phases: 4.

Speed reducer: 1/64

Step angle: 5.625° / 64

Frequency: 100Hz

DC resistance: 50Ω ±7% (25°C)

Frequency with traction: > 600Hz

Non-traction frequency: > 1000Hz

Traction torque: >34.3mN.m (120Hz)

Self-positioning torque: >34.3mN.m

Torque with friction: 600-1200 gf.cm

Torque drag: 300 gf.cm

Insulation resistance > 10MΩ (500V)

Electrical insulation: 600VAC/1mA/1s

Insulation grade: A

Temperature rise: < 40K (120Hz)

Noise: < 35dB (120Hz, no load, 10cm)

ULN2003APG

Main specifications:

500 mA nominal collector current (single output)

50V output (there is a version that supports 100V output)

Includes output flyback diodes

TTL and 5-V CMOS logic compatible inputs

Female pins

Male pins

A socket for arduino mini pro

A 100 nF ceramic disc capacitor

90 degree female pins

PCB

Download gerber file –> pcb stepper motor bluetooth

Application

Download app and source file app inventor–> https://rogerbit.com/wprb/wp-content/uploads/2022/10/app-motor-paso-a-paso-bluetooth.zip

Code

Source code

C/C++

#define pin2  2
#define pin3  3
#define pin4  4
#define pin5  5
#define retardo 2   

char caracter;
String cadena; 
float pasos = 0;
int datos_serial = 0;

void setup() {
  pinMode(pin2, OUTPUT);
  pinMode(pin3, OUTPUT); 
  pinMode(pin4, OUTPUT); 
  pinMode(pin5, OUTPUT);
  Serial.begin(57600); //Velocidad del módulo bluetooth
}

void loop() {
  while (Serial.available()) {  
    delay(3);                  
    char c = Serial.read(); 
    cadena += c;        
  }
 
  if (cadena.length() >0) { 
  
   Serial.println(cadena.toInt());  
    datos_serial = cadena.toInt();
    
  }
  while(datos_serial>pasos){
             
         atras();
         delayMicroseconds(40);
         pasos = pasos + 1;
    
  }
 while(datos_serial<pasos){
         
          adelante();
          delayMicroseconds(40);
          pasos = pasos - 1;
    
  }
  
  if (cadena == "SET"){
    pasos = 0;
    datos_serial = 0;
    }
 
  cadena=""; 
}
void paso1(){
  digitalWrite(pin2, HIGH); 
  digitalWrite(pin3, HIGH); 
  digitalWrite(pin4, LOW); 
  digitalWrite(pin5, LOW); 
}
void paso2(){
  digitalWrite(pin2, LOW); 
  digitalWrite(pin3, HIGH);
  digitalWrite(pin4, HIGH); 
  digitalWrite(pin5, LOW); 
}
void paso3(){
  digitalWrite(pin2, LOW); 
  digitalWrite(pin3, LOW); 
  digitalWrite(pin4, HIGH);
  digitalWrite(pin5, HIGH); 
}
void paso4(){
  digitalWrite(pin2, HIGH); 
  digitalWrite(pin3, LOW); 
  digitalWrite(pin4, LOW); 
  digitalWrite(pin5, HIGH); 
}
void pasoApagado(){
  digitalWrite(pin2, LOW); 
  digitalWrite(pin3, LOW); 
  digitalWrite(pin4, LOW); 
  digitalWrite(pin5, LOW); 
}


void adelante(){
  paso1();
  delay(retardo);
  paso2();
  delay(retardo);
  paso3();
  delay(retardo);
  paso4();
  delay(retardo);
}

void atras(){
  paso3();
  delay(retardo);
  paso2();
  delay(retardo);
  paso1();
  delay(retardo);
  paso4();
  delay(retardo);
}

Jul 20,2024

318 views

Stepper motor control x bluetooth and app

In this tutorial we will see a circuit, which controls a stepper motor, with an application made in app inventor, using bluetooth

318

Published: Jul 20,2024

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