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RUNNING LINEAR ACTUATOR without feed back
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Joined: Sat Jan 04, 2014 3:12 am
Posts: 2
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;
TS=(3600*hour)+(60*minute);
Desire_Degree=(TS*slope)+intercept;

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
or
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.

 Code: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(){   h=7;  m=30;    Serial.begin(9600);  }static int time_interval;void loop(){  calc_min();  //Desire degree calculation  if(h<23)  {  TS=(3600*h)+(60*m);  Desire_Degree=(TS*slope)+intercept;    //Actual anngle calculation  time_interval=(10)/(11*ACT_SPEED)*(25/88); // 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(h);Serial.print(":");Serial.println(m);  Serial.print("Desired Degree:"); Serial.println(Desire_Degree); Serial.print("Actual Degree:"); Serial.println(Actual_Degree); Serial.print("length:"); Serial.println(length); Serial.print("Actual pos:"); Serial.println(Actual_postion);Serial.println(".................................");    }    delay(1000);}void calc_min(){if(m<60){   m=m+5;}else if(m==60){  m=0;h=h+1;}}

Sat Jan 04, 2014 3:15 am

Joined: Thu May 24, 2012 12:15 pm
Posts: 580
Re: RUNNING LINEAR ACTUATOR without feed back
You may get a better response posting this to the Arduino forums (http://forum.arduino.cc/) 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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