help adding a second servo code

Projects Programming
1

ok here is what i'm doing. i've made a coding to control one servo to sweep from position 90, being 90 degrees to go to position 174 and back on a single push button. what i'm trying to do is add another servo on a different pin and controlled by the same button, i'm thinking pin 6 and i want that servo to sweep from 90 degrees to 6 degrees, the opposite direction and i've figured out and additional power-source for the additional servo. here is the code for the one servo. any help will be appreciated. thank you.

#include <Servo.h>

int inputPin = 10; // Push button input pin
int btnVal = 0; // Current value of pushbutton
int ledPin = 13; // Pin for white LED
int outputPin = 9; // Servo pin
int servo_pos = 0; // Current servo position
int servo_pos_a = 90; // Position destination a
int servo_pos_b = 174; // Position destination b
int servo_state = 0; // 0 = position a, 1 = position b

Servo mrservo; // create servo object to control the servo

void setup() {
pinMode(inputPin, INPUT); // Push Button
pinMode(ledPin, OUTPUT); // LED
mrservo.attach(outputPin); // attaches the servo on pin 9 to the servo object
Serial.begin(9600);
Serial.println("Starting...");
}

void loop() {
btnVal = digitalRead(inputPin);
if(btnVal == LOW) {
Serial.println("Button: LOW");
if(servo_state) {
Serial.println("Position: a");

} else {
Serial.println("Position: b");
}
}
if(btnVal == HIGH) {
Serial.println("Button: HIGH");
if(servo_state) {
Serial.println("Position: a");
} else {
Serial.println("Position: b");
}
// Move from position a to position b
if(servo_state == 0) {
Serial.print(servo_pos_a); Serial.print(" to "); Serial.println(servo_pos_b);
for(servo_pos = servo_pos_a; servo_pos < servo_pos_b; servo_pos += 3) {
mrservo.write(servo_pos);
digitalWrite(ledPin, HIGH);
delay(15); // waits 15ms for the servo to reach the position
}
servo_state = 1;
} else { // Move from position b to position a
Serial.print(servo_pos_b); Serial.print(" to "); Serial.println(servo_pos_a);
for(servo_pos = servo_pos_b; servo_pos >= servo_pos_a ; servo_pos -= 3) {
mrservo.write(servo_pos);
digitalWrite(ledPin, LOW);
delay(15);
}
servo_state = 0;
}
}
// Separate each cycle's output
Serial.println(); Serial.println();
delay(250);
}

2

You'll need a second instance of the Servo class, mrsservo, attached to the correct pin.

Change the first for loop:

for(int servo_offset = 0; servo_offset < (servo_pos_b - servo_pos_a); servo_offset+=3)
{
   mrservo.write(servo_pos_a + servo_offset);
   mrsservo.write(servo_pos_a - servo_offset);
}

servo_offset will be assigned values 0, 3, 6, 9, ..., 72, 75. mrservo will move to 90, 93, 96, ..., while mrsservo will move to 90, 87, 84, ...

Similar changes to the second for loop will return the servos to their original positions.

Changing the increment to 2, or the end-limit to a multiple of 3, would be required to actually get to the limit value.