Hi guys, Im new here and i was wondering if you guys knew how many servos an arduino can use at 1 time.
**Thank you so much **
Thank you so much
I used 3 servos in v12. I
The code I used worked for 3 servos in v12 with pins 5, 6 and 9
// Begin Robot Code
int micVal;
int cdsVal;
int irLval; // Left IR
int irCval; // Center IR
int irRval; // Right IR
int i; // Generic Counter
int x; // Generic Counter
int PLval; // Pulse Width for Left Servo
int PRval; // Pulse Width for Right Servo
int cntr; // Generic Counter Used for Determining amt. of Object Detections
int counter; // Generic Counter
int clrpth; // amt. of Milliseconds Of Unobstructed Path
int objdet; // Time an Object was Detected
int task; // Routine to Follow for Clearest Path
int pwm; // Pulse Width for Pan Servo
boolean add; // Whether to Increment or Decrement PW Value for Pan Servo
int distance; // Distance to Object Detected via Ultrasonic Ranger
int oldDistance; // Previous Distance Value Read from Ultrasonic Ranger
float scale = 1.9866666666666666666666666666667; // Not Currently Used
int LeftPin = 6; // Left Servo
int RightPin = 9; // Right Servo
int PiezoPin = 11; // Piezo
int PingServoPin = 5; // Pan Servo
int irLPin = 0; // Analog 0; Left IR
int irCPin = 1; // Analog 1; Center IR
int irRPin = 2; // Analog 2; Right IR
int ultraSoundSignal = 7; // Ultrasound signal pin
int val = 0; // Used for Ultrasonic Ranger
int ultrasoundValue = 0; // Raw Distance Val
int oldUltrasoundValue; // Not used
int pulseCount; // Generic Counter
int timecount = 0; // Echo counter
int ledPin = 13; // LED connected to digital pin 13
#define BAUD 9600
#define CmConstant 1/29.034
void setup() {
Serial.begin(9600);
pinMode(PiezoPin, OUTPUT);
pinMode(ledPin, OUTPUT);
pinMode(LeftPin, OUTPUT);
pinMode(RightPin, OUTPUT);
pinMode(PingServoPin, OUTPUT);
pinMode(irLPin, INPUT);
pinMode(irCPin, INPUT);
pinMode(irRPin, INPUT);
for(i = 0; i < 500; i++) {
digitalWrite(PiezoPin, HIGH);
delayMicroseconds(1000);
digitalWrite(PiezoPin, LOW);
delayMicroseconds(1000);
}
for(i = 0; i < 20; i++) {
digitalWrite(PingServoPin, HIGH);
delayMicroseconds(655 * 2);
digitalWrite(PingServoPin, LOW);
delay(20);
}
ultrasoundValue = 600;
i = 0;
}
void loop()
{
//Scan();
Look();
Go();
}
void Look() {
irLval = analogRead(irLPin);
irCval = analogRead(irCPin);
irRval = analogRead(irRPin);
//if(counter > 10) {
//counter = 0;
//readPing();
//}
if(irLval > 200) {
PLval = 850;
PRval = 820;
x = 5;
cntr = cntr + 1;
clrpth = 0;
objdet = millis();
}
else if(irCval > 200) {
PLval = 850;
PRval = 820;
x = 10;
cntr = cntr + 1;
clrpth = 0;
objdet = millis();
}
else if(irRval > 200) {
PLval = 650;
PRval = 620;
x = 5;
cntr = cntr + 1;
clrpth = 0;
objdet = millis();
}
else {
x = 1;
PLval = 850;
PRval = 620;
counter = counter + 1;
clrpth = (millis() - objdet);
if(add == true) {
pwm = pwm + 50;
}
else if(add == false) {
pwm = pwm - 50;
}
if(pwm < 400) {
pwm = 400;
add = true;
}
if(pwm > 950) {
pwm = 950;
add = false;
}
digitalWrite(PingServoPin, HIGH);
delayMicroseconds(pwm * 2);
digitalWrite(PingServoPin, LOW);
delay(20);
readPing();
if(ultrasoundValue < 500) {
cntr = cntr + 1;
switch(pwm) {
case 400:
x = 7;
PLval = 650;
PRval = 650;
Go();
break;
case 500:
x = 10;
PLval = 650;
PRval = 650;
Go();
break;
case 600:
x = 14;
PLval = 850;
PRval = 850;
Go();
break;
case 700:
x = 10;
PLval = 850;
PRval = 850;
Go();
break;
case 950:
x = 7;
PLval = 850;
PRval = 850;
Go();
break;
}
}
}
//Serial.print("clrpth: ");
//Serial.println(clrpth);
//Serial.print("objdet: ");
//Serial.println(objdet);
//Serial.print("cntr: ");
//Serial.println(cntr);
if(cntr > 25 && clrpth < 2000) {
clrpth = 0;
cntr = 0;
Scan();
}
}
void Go() {
for(i = 0; i < x; i++) {
digitalWrite(LeftPin, HIGH);
delayMicroseconds(PLval * 2);
digitalWrite(LeftPin, LOW);
digitalWrite(RightPin, HIGH);
delayMicroseconds(PRval * 2);
digitalWrite(RightPin, LOW);
delay(20);
}
}
void readPing() { // Get Distance from Ultrasonic Ranger
timecount = 0;
val = 0;
pinMode(ultraSoundSignal, OUTPUT); // Switch signalpin to output
/* Send low-high-low pulse to activate the trigger pulse of the sensor
* -------------------------------------------------------------------
/
digitalWrite(ultraSoundSignal, LOW); // Send low pulse
delayMicroseconds(2); // Wait for 2 microseconds
digitalWrite(ultraSoundSignal, HIGH); // Send high pulse
delayMicroseconds(5); // Wait for 5 microseconds
digitalWrite(ultraSoundSignal, LOW); // Holdoff
/ Listening for echo pulse
* -------------------------------------------------------------------
/
pinMode(ultraSoundSignal, INPUT); // Switch signalpin to input
val = digitalRead(ultraSoundSignal); // Append signal value to val
while(val == LOW) { // Loop until pin reads a high value
val = digitalRead(ultraSoundSignal);
}
while(val == HIGH) { // Loop until pin reads a high value
val = digitalRead(ultraSoundSignal);
timecount = timecount +1; // Count echo pulse time
}
/ Writing out values to the serial port
* -------------------------------------------------------------------
/
ultrasoundValue = timecount; // Append echo pulse time to ultrasoundValue
//serialWrite(‘A’); // Example identifier for the sensor
//printInteger(ultrasoundValue);
//serialWrite(10);
//serialWrite(13);
/ Lite up LED if any value is passed by the echo pulse
* -------------------------------------------------------------------
*/
if(timecount > 0){
digitalWrite(ledPin, HIGH);
}
}
void Scan() { // Scan for the Clearest Path
oldDistance = 30;
task = 0;
for(i = 1; i < 5; i++) {
switch(i) {
case 1:
//Serial.println(“Pos. 1”);
pwm = 1125; /// incr. by 100 from 1085
break;
case 2:
//Serial.println(“Pos. 2”);
pwm = 850; //// increased by 100 from 850
break;
case 3:
//Serial.println(“Pos. 3”);
pwm = 400;
break;
case 4:
//Serial.println(“Pos. 4”);
pwm = 235;
break;
}
for(pulseCount = 0; pulseCount < 20; pulseCount++) { // Adjust Pan Servo and Read USR
digitalWrite(PingServoPin, HIGH);
delayMicroseconds(pwm * 2);
digitalWrite(PingServoPin, LOW);
readPing();
delay(20);
}
distance = ((float)ultrasoundValue * CmConstant); // Calculate Distance in Cm
if(distance > oldDistance) { // If the Newest distance is longer, replace previous reading with it
oldDistance = distance;
task = i; // Set task equal to Pan Servo Position
}
}
//Serial.print("Task: ");
//Serial.println(task);
//Serial.print("distance: ");
//Serial.println(distance);
//Serial.print("oldDistance: ");
//Serial.println(oldDistance);
distance = 50; // Prevents Scan from Looping
switch(task) { // Determine which task should be carried out
case 0: // Center was clearest
x = 28;
PLval = (850);
PRval = (850);
Go();
break;
case 1: // 90 degrees Left was Clearest
x = 14;
PLval = (650);
PRval = (650);
Go();
break;
case 2: // 45 degrees left
x = 7;
PLval = (650);
PRval = (650);
Go();
break;
case 3: // 45 degrees right
x = 7;
PLval = (850);
PRval = (850);
Go();
break;
case 4: // 90 degrees right
x = 14;
PLval = (850);
PRval = (850);
Go();
break;
}
}
// End Robot Code
$20 servo driver
I have been using this for quite a while now with great results… It’s only 20 bucks, comes with it’s own resonator and is I2C.
how would i use this? i am
how would i use this? i am an absolute beginner and i sorta dont understand what a driver is and how it can be used.