I've got a project I'm working on here:
I've hooked a servo to a set of louvers that are to open and close depending on input from a temp sensor. I got it all hooked up, but due to space restrictions I was limited in servo placement. Now I found that the servo spins the wrong way! How can I make it rotate the opposite direction?
Here is the code I'm currently using:
// Controlling a servo position using a temperature sensor
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>
// edited 5-12-2010 by Will Lyon to include base setting for servo if voltage not detected on pin 7
// edited again 7-4-2010 by crenn to simplify the code a little
// edited yet again 7-5-2010 by crenn to add features
#include <Servo.h>
Servo myservo; // create servo object to control a servo
//Constants
const unsigned char CONTROL = 7; // digital pin used to detect if the system is on or off
const unsigned char temps = 0; // analogue pin used to connect the temp sensor
const unsigned char MAX_VAL = 10;
//Main global varibles
char trigger = 0; // varible used to store the control pin value
unsigned int val; // variable to read the value from the analog pin
unsigned int updateAvgtemp(){
static int history[MAX_VAL]={0};
static unsigned char lastHist=0;
static unsigned char numHist=0;
unsigned int temp=0;
unsigned char counter=0;
unsigned char arcount=0;
history[lastHist] = analogRead(temps);
if(numHist<MAX_VAL)
++numHist;
arcount=lastHist;
++lastHist;
if(lastHist>=MAX_VAL)
lastHist=0;
temp=0;
counter=0;
do{
temp+=history[arcount];
arcount--;
if(arcount>MAX_VAL)
arcount=(MAX_VAL-1);
counter++;
}while(counter < numHist);
return (temp/numHist);
}
void setup()
{
pinMode (CONTROL, INPUT); // sets the control pin to input
myservo.attach(9); // attaches the servo on pin 9 to the servo object
digitalWrite(CONTROL, LOW); // ensure internal pullup resistor is disabled.
}
void loop()
{
trigger = digitalRead(CONTROL); // read input of pin CONTROL and store it
if (trigger == HIGH){ // reads if pin CONTROL, if true, do this:
val = updateAvgtemp(); // read the value of the temp sensor (value with range of 1024)
val = map(val, 350, 700, 5, 175); // scale it to use it with the servo (value between 75 and 105)
myservo.write(val); // sets the servo position according to the scaled value
}
else {
myservo.write(50); // sets servo position to 50 if above statment is false
}
delay(125); // wait 25ms for the servo to move to it's new position and also 100ms until it gets the new value
}
could I just swap the (5, 175) to (175, 5) in the val=map section? :-/
