I have an aruino mega for piloting a motor driver card, using PWM to control the speed and one pin other pin for controlling the rotation way.
Each time the arduino boot up (by connecting the USB or the 9V) also when I established a serial connection, the motors impulse at full speed for really short time.
The pin out from the arduino are connected directly to the motor board ; Do I need some kine of filter like capacitor, resistor ?
Do I need shielded cables ?
see the picture of the motor card bellow, bought on Ebay
http://www.ebay.com/itm/151020554752?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
see the video here
https://www.youtube.com/watch?v=dwMAibieS8w&feature=youtube_gdata_player
here is the diagramm of the circuit
close picture
The code (really simple)
const int dir1 = 2; // motor 1 direction - white
const int pwm1 = 3; // motor 1 PWM - green
const int dir2 = 4; // motor 2 direction - brown
const int pwm2 = 5; // motor 2 PWM - black
void setup()
{
Serial.begin(9600);
pinMode(dir1, OUTPUT);
pinMode(dir2, OUTPUT);
Serial.println("Speed (0-9) or + - to set direction");
}
void loop()
{
if ( Serial.available()) {
char ch = Serial.read();
if(isDigit(ch))
{
int speed = map(ch, '0', '9', 0, 250);
analogWrite(pwm1, speed);
analogWrite(pwm2, speed);
Serial.println(speed);
}
else if (ch == '+')
{
Serial.println("+");
digitalWrite(dir1,LOW);
digitalWrite(dir2,LOW);
}
else if (ch == '-')
{
Serial.println("-");
digitalWrite(dir1,HIGH);
digitalWrite(dir2,HIGH);
}
}
}
Yes, all ground together
Yes, you need to connect all your grounds together. Always.
It’s a good thing.
code modified and relay added
I had a relay to to cut the power of the motors during the boot
and I coding that
// ARCOS //
//
// constant declaration
int solenoidPin = 6; // relay coil connected to pin 2
unsigned long currenttime; // current time
unsigned long boottime; // system boot up time
const int dir1 = 2; // motor 1 direction - white
const int pwm1 = 3; // motor 1 PWM - green
const int dir2 = 4; // motor 2 direction - brown
const int pwm2 = 5; // motor 2 PWM - black
// setting up the system
void setup()
{
pinMode(solenoidPin, OUTPUT); // relay coil pin is an output
currenttime = millis(); // what time is it ?
boottime = currenttime; // record the time as a boot time
Serial.begin(9600); // set serial connection
pinMode(dir1, OUTPUT); // motor 1 direction pin is an output
pinMode(dir2, OUTPUT); // motor 2 direction pin is an output
Serial.println("Speed (0-9) or + - to set direction"); // print on screen the instructions
}
// main loop
void loop()
{
currenttime = millis();
if(currenttime >= (boottime + 10000)); // if 10 secondes past since the boot ...
{digitalWrite(solenoidPin, HIGH);} // relay activates
if ( Serial.available());
{char ch = Serial.read();
if(isDigit(ch))
{int speed = map(ch, '0', '9', 0, 250);
analogWrite(pwm1, speed);
analogWrite(pwm2, speed);
Serial.println(speed);}
else if (ch == '+')
{Serial.println("+");
digitalWrite(dir1,LOW);
digitalWrite(dir2,LOW);}
else if (ch == '-')
{Serial.println("-");
digitalWrite(dir1,HIGH);
digitalWrite(dir2,HIGH);}
}
}
but that doesnt work, the relay is immediately activation without any delay, and also latching after power down the arduino, until I disconnect one of the solenoid wires !!!!
help!
Do I am the only guy with this problem ?
Somebody experienced this problem with arduino ? yes, how to fix it ?
is it my arduino bad or the motor driver ?
I feel disarmed, disapointed, please help me, any ideas ?
its fix !
I finnally fix it by installing a pull-down resistors (thank odd-bot), I put a 2k2 resistors, see the following schematic
