I am new and love robots but since i am a beginner i am running into confusion. I bought a 2 wheel chasis car with 2 dc motors, an xbee motor shield found here
i have 2 wires for each dc motor, for the left wheel the 2 wires go into B- and B+, and for the 2 wires coming from the right wheel i plugged them into A+, and A- . I connected the xbee pro modules in XCTU.
The problem is when I use serial moniter from the arduino software and have my rc car plugged in through a usb to the computer it works fine when i send commands, but when i unplug it from my computer, and use an xbee transmitter only hooked up to my computer and other xbee on the motor shield and use xctu and send for example an w command which moves it forward nothing happens, the light flashes on the motor shield so i know they are communicating but the dc motors dont turn please help.
Here is the code
int lmt1=11,lmt2=12,rmt1=8,rmt2=9; //set your motor output pins left motor terminals and right motor terminals
int value; // declaring variable used in serial communication
void setup() // main function executes only once
{
pinMode(lmt1,OUTPUT);
pinMode(lmt2,OUTPUT);
pinMode(rmt1,OUTPUT);
pinMode(rmt2,OUTPUT);
Serial.begin(9600); // serial communication begins baud rate is 9600
}
void loop()
{
value=Serial.read(); //it will read the data recieved by xbee
switch(value) // will activate the case according to the value
{
case ‘w’: // pressing w from keyboard activates this case and robot moves forward
Serial.println(“Robot moves forward”);
fwd();
break; // restart the loop function
case ‘d’: // pressing d from keyboard activates this case and robot turns right
Serial.println(“Robot turns right”);
right();
break;
case ‘a’: // pressing a from keyboard activates this case and robot turns left
Serial.println(“Robot turns left”);
left();
break;
case ‘s’: // pressing s from keyboard activates this case and robot stops
Serial.println(“Robot stops”);
Stop();
break;
case ‘z’: // pressing z from keyboard activates this case and robot moves back
Serial.println(“Robot moves back”);
back();
break;
}
}
void Stop() // function details
{
digitalWrite(lmt1,LOW); // logic to stop all motor signal 0 volt
digitalWrite(lmt2,LOW);
digitalWrite(rmt1,LOW);
digitalWrite(rmt2,LOW);
}
void left()
{
digitalWrite(lmt1,LOW); // logic to move left. Right motor moves forward and left motor backwards
digitalWrite(lmt2,HIGH);
digitalWrite(rmt1,HIGH);
digitalWrite(rmt2,LOW);
}
void right() // logic to move right. Left motor moves forward and right motor backwards
{
digitalWrite(lmt1,HIGH);
digitalWrite(lmt2,LOW);
digitalWrite(rmt1,LOW);
digitalWrite(rmt2,HIGH);
}
void fwd() // logic to move forward. both motor moves forward
{
digitalWrite(lmt1,HIGH);
digitalWrite(lmt2,LOW);
digitalWrite(rmt1,HIGH);
digitalWrite(rmt2,LOW);
}
void back() // logic to move Backwards. both motor moves backwards
{
digitalWrite(lmt1,LOW);
digitalWrite(lmt2,HIGH);
digitalWrite(rmt1,LOW);
digitalWrite(rmt2,HIGH);
}