hello all, I am trying to get a servo to operate via a photocell.
all attempts have failed any advice would be helpful.
I am using the arduino uno and I have a basic sketch but I think its not working.
here it is.
[code] #include <Servo.h>
Servo myservo; // create servo object to control a servo
// a maximum of eight servo objects can be created
int pos = 0; // variable to store the servo position
int dest = 0; // Servo destination depending on photocell reading
int spd = 50; // how fast should the servo move? 50 is quier
int servoPin=0; //havent used this yet
int photocellPin = 0; // the cell and 10K pulldown are connected to a0
int photocellReading; // the analog reading from the analog resistor divider
int state = 0; //Keep track of state so we don't send signal to the servo without readon, better on battery life
int prevstate = 0;
int debug = 0; //Set this to 1 for serial debug output
void setup(void) {
// Serial.begin(9600); //Comment out this line if you don't want debugging enabled
}
void loop(void) {
photocellReading = analogRead(photocellPin); //Query photo cell
debug and Serial.print("Light Reading :");
debug and Serial.print(photocellReading); // the raw analog reading
debug and Serial.print(" | Position: ");
debug and Serial.print(pos);
debug and Serial.print(" | State: ");
//Define the modes based on how bright it is, and set corresponding servo position
if (photocellReading < 400) {
debug and Serial.println("Night");
dest=180;
state=1;
}
else if (photocellReading < 600) {
debug and Serial.println("Dusk");
dest=135;
state=2;
}
else if (photocellReading < 950) {
debug and Serial.println("Day");
dest=85;
state=3;
}
else if (photocellReading < 1023) {
debug and Serial.println("Very Bright Day");
dest=20;
state=4;
}
else {
debug and Serial.println("No reading");
}
if (state != prevstate){ //IF the photocell reading is different from last sample then execute servo controls
debug and Serial.println("State Change");
myservo.attach(9); //Connect to servo
if (pos > dest){ // If the current position is great than the destination then we must subtract
//for(pos = pos; pos>=dest; pos-=1) // Change current position to desired position, one degree at a time.
while (pos > dest)
{
debug and Serial.print("Was :");
debug and Serial.print(pos);
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(spd); // waits 15ms for the servo to reach the position
pos--;
debug and Serial.print(" | Is :");
debug and Serial.println(pos);
}
myservo.detach(); //Detach from Servo
}
else { // If the current position is great than the destination then we must add
myservo.attach(9);
//for(pos = pos; pos <= dest; pos+=1) // goes from 180 degrees to 0 degrees
while (pos < dest)
{
debug and Serial.print("Was :");
debug and Serial.print(pos);
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(spd); // waits 15ms for the servo to reach the position
pos++;
debug and Serial.print(" | Is :");
debug and Serial.println(pos);
}
}
myservo.write(pos); // Doing a write out side of the loop because I had a feeling the last position value was being skipped. I think I'm wrong though
delay(spd);
myservo.detach();
}
prevstate = state; //Remember state so we can compare it again next round
delay(1000); //Optional delay, this probalby needs to be removed when IR receiver code get's added.
}
[/code]
Hope we can help.