HELP!

Other Hardware Robotics
1

I am currently using a breadboard with 2 servos connected and an arduino with the servos connected too. I also have a hc-sro4 connected to the arduino and need help coding. Whenever i run the servos sometimes they don't work. and even if they do work, they run backwards after executing my commands to them

2

Hi,
We need more info! how are the servos connected how are you powering them, not from the arduino I hope! it can't supply the current they need, a seperate 6v is needed.

Let us see your schematic (or a good clear photo) and code, THEN we can help.

Regards

Mel.

3

Thanks for responding.

My 2 servos are have GND and Power connected to the breadboard, but have the signal wires connected to ports 9 & 10 on the arduino. The HC-SR04 sensor has GND and Power on the arduino and also has Trig and Echo connected to ports 4 & 2 respectively.

Regards, HOWDOESITNOTWORK.

4

Code:

#include <Servo.h>
#define trigPin 4
#define echoPin 2
Servo servo1;
Servo servo2;

void setup() {
Serial.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
servo1.attach(9);
servo2.attach(10);
int pos1 = 0;
}

void loop() {
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(2);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) / 29.1;
if (distance < 10) {
for (int pos1 = 0; pos1 < 180; pos1 += 1) {
servo2.write(pos1);
delay(15);
}
}
}

5

Always power servos from a separate power supply, capable of 1 ampere per servo. Connect the grounds.

6

Hi,
Your code looks OK, but why the Serial.begin? So where is the problem, again how are you powering the servos?

Here's the code I use on one of my bots:

------------------------------------------------------------------
long scanner(long cm)
{
	const int pingPin=2, EchoPin=3;
	long duration;

	// The SRF005 is triggered by a HIGH pulse of 2 or more microseconds.
	// Give a short LOW pulse before to ensure a clean HIGH pulse:
	pinMode(pingPin, OUTPUT);
	pinMode(EchoPin, INPUT);  

	digitalWrite(pingPin, LOW);
	delayMicroseconds(2);
	digitalWrite(pingPin, HIGH);
	delayMicroseconds(2);
	digitalWrite(pingPin, LOW); 
	duration = pulseIn(EchoPin, HIGH);
	delay(100);

	// convert the time into a distance
	// inches = microsecondsToInches(duration);
	cm = microsecondsToCentimeters(duration);
	return (cm);
}
//------------------------------------------------------------------
long microsecondsToCentimeters(long microseconds)
{
	// The speed of sound is 340 m/s or 29 microseconds per centimetre.
	// The ping travels out and back, so to find the distance of the
	// object we take half of the distance travelled.
	return microseconds / 29 / 2;
}

Hope it helps, regards

Mel.