Good day. I'm new to Arduino but I'm working on a project where I need to get my Arduino master to send step data to my slave for it to move in said direction, but even though the data sort of comes through serially, I can't get my motor to move. I have 2 pieces of code but I don't know where I'm going wrong or might have gone wrong. I was hoping to share an image too but it's not coming through. please forgive any mistakes.
// Wire Master Writer
#include <Wire.h>
void setup() {
Wire.begin(); // join i2c bus (address optional for master)
Serial.begin(9600);
}
byte x = 0;
char c;
void loop() {
while(Serial.available()>0){
c=Serial.read();
Wire.beginTransmission(8); // transmit to device #8
Wire.write(c);
Wire.endTransmission(); // stop transmitting
}
x;
delay(500);
}
----------------------------------------------------------------------------------------
// Wire Slave Receiver
#include <Wire.h>
#include <Stepper.h>
int stepsPerRevolution=360;
int motSpeed=10;
int StepsPerMillimeterX = 5.0;
int Loc_int;
Stepper stepper_X_axis (stepsPerRevolution,8,9,10,11);
void setup() {
Wire.begin(8); // join i2c bus with address #8
Wire.onReceive(receiveEvent); // register event
Serial.begin(9600); // start serial for output
stepper_X_axis.setSpeed(motSpeed);
}
void loop() {
stepper_X_axis.step(stepsPerRevolution);
delay(100);
}
// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany) {
while (Wire.available()){
char x = Wire.read(); // receive byte as an integer
Serial.println(x); // print the integer
int Loc_Int =x ;
Serial.println(Loc_Int);
//stepper_X_axis.step(stepsPerRevolution);
}
//delay(500);
}
1. Upload the simple sketches into Master and Slave to see that the Master can detect the presence of Slave and the Slave receives 7 (for example) from Master and shows on its Serial monitor. Do not forget to connect 2x4.7k pull-up resisters with signal wires of the I2C bus. Also, connect the GND-wire between the UNOs. The connection should be like Fig-1.
Figure-1:
2.Master Sketch:
#include <Wire.h>
char y;
void setup()
{
Wire.begin();
Serial.begin(9600);
//-----------------
Wire.beginTransmission(8);
byte busStatus = Wire.endTransmission();
if (busStatus != 0)
{
Serial.print("Slave is not found.");
while (1); //wait for ever
}
Serial.println("Slave is found.");
}
void loop()
{
while (Serial.available() == 0)
{
; //wait until data comes from SM1
}
y = Serial.read();
Wire.beginTransmission(8);
Wire.write(y);
Wire.endTransmission();
}
3.Slave Sketch:
#include <Wire.h>
char y;
volatile bool flag = false;
void setup()
{
Wire.begin(8);
Wire.onReceive(receiveEvent); // register event
Serial.begin(9600);
}
void loop()
{
if(flag == true)
{
Serial.println(y);
flag = false;
}
}
void receiveEvent(int howMany)
{
y = Wire.read(); // receive byte as an integer
flag = true;
}
4. Open Serial Monitor at the Master side with No line ending option. 5. Check that the message "Slave is found." has appeared on the OutputBox of the Serial Monitor (Fig-2).
6. Open Serial Monitor for the Slave. 7. Enter 7 in the InputBox of the Serial Monitor of Master and then click on the Send button. 8. Check that 7 has appeared on SM2. 9. Now add your motor related codes with the above functional sketches.
