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RUNNING LINEAR ACTUATOR without feed back 
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Joined: Sat Jan 04, 2014 3:12 am
Posts: 2
Post RUNNING LINEAR ACTUATOR without feed back
Dear all,

I am trying to do single axis solar tracker with linear actuator /rtc/ UNO. I have already done with feedback sensor. Now Here i am trying to without feedback.
Linear actuator specification: 24v , 3.2mm/sec as speed , 600mm stoke.

Desired angle calculation: tracking start from 7am to 18PM, 11hours
Assumed degree: 7AM as -45 deg , 12.30 as 0 degree and 18 pm as 45 degree.
static float slope= 0.00227272727273;
static float intercept=- 102.272727273;

Problem part : calculating actual angle/ calculation for Ton time and convert in to +/-45 degree format.
rate=distance/ time
Ton=600mm/660minute = 10/11 mm each minute
time * 3.2mm/sec = 10mm / 11
time= (25 / 88) sec/minute;
if i wanna run for 2 sec ->(2*88/25)= 7.04 i.e actuator must on for 7 minute;
angle= ((3 * position) / 20) - 45 and
position =((angle + 45) * 20) / 3
since position = 3.2 * time
angle =((96 * time) / 200) - 45.
How can i put time here.
can someone help me coding for calculating Ton time and solve above equation. below i posted my code . I need it has to be modified little bit. i need to implement ton time actuator here.

double Desire_Degree;
unsigned int TS;
static float slope= 0.00227272727273;
static float intercept=- 102.272727273;
static int length;
double Actual_Degree;
static int h;
static int m;
double Actual_postion;
static float ACT_SPEED=3.2;

void setup()
static int time_interval;

void loop()
  //Desire degree calculation
  //Actual anngle calculation
 // length=(TS*3.2);
  length =(0.0151466666667*TS - 381.504);
  Actual_Degree=((3 *length) / 20) - 45;
  Actual_postion=((Actual_Degree + 45) * 20) / 3;
 // actual_deg=((3*length)/200)-45;
  Serial.print("HH-MM: ");
  Serial.print("Desired Degree:");
 Serial.print("Actual Degree:");
 Serial.print("Actual pos:");

void calc_min()

}else if(m==60)

Sat Jan 04, 2014 3:15 am
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Joined: Thu May 24, 2012 12:15 pm
Posts: 722
Post Re: RUNNING LINEAR ACTUATOR without feed back
You may get a better response posting this to the Arduino forums ( as this code is using the Arduino software (and we generally focus on ROBOTC-related questions on these forums).

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Tue Jan 21, 2014 11:30 am
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