INA168: INA168

5volt is expected output voltage but i am getting 0.005Voltage at output side . I had changed input voltage but still getting voltage gain of 1.

#include<LiquidCrystal.h>
#include<Wire.h>
#include<EEPROM.h>

 LiquidCrystal lcd(12,11,5,4,3,2);
  int count = 0; // This variable is counting impulses
  int  p0 = 1;
  int a=0;
   
  float USOC=100;
  int addr = 0;
  
   float SOC = 100; // SOC 100 means battery charge level 100 percent
  void setup()
  {
      lcd.begin(16,2);
      pinMode(p0,INPUT); // Input from UJT output for impulse output.
  }

void loop() 
  {
      lcd.setCursor(0,1);
    lcd.clear();
    int input = digitalRead(p0);
     while (input == 1)
     {
       if (input == 0)
       {   
      
      if (a==0)
      {
      
      count += 1; // Count variable is counting impulses
     float countp = count*100/5781.23;/*Countp variable indicates how much battery get discharge where 5781.23 is total number of impulse we will get when our battery will fully discharged which is calculated by battery Charge when battery is fully charged .*/
     SOC = SOC - countp; // this is the rest of battery charge
     a=1;
     
      }
       }
     }
      if(a==1)
      {
        a=0;
      }  
     
    lcd.print("SOC: "); 
    lcd.print(SOC);
    lcd.setCursor(0,2);
    lcd.print(count);
    delay(100);
 
  }
  

Tarun Ti.pptx

My Vr1 voltage is variable ranging from 3mv to 40mv  and I want output in rang of 3voltage  to 10voltage this voltage output should be linear  with the help of INA168.

- I required above results because We are Engineering students and we are making a Electrical ATV (ALL -TERRAIN-VEHICLE) and we have a battery of 48v, 144Ah and one Induction motor for wheel . Now we had made our ATV.

- But problem is When our vehicle runs on a  track  current through DC battery is upto 153A(From motor power we had calculated it).

- We want to know that how much our battery get discharge while running . So I take taping from current shunt this is the input for INA168 and output of INA168 is we expect in range of 3v to 10v (linear) so that my SOC (state of charge )Circuit will work .

- Attachment here is this power train diagram of our ATV and in orange colour outline is the main area and  my SOC circuit is connected to current shunt  which consist INA168 , UJT, Capacitor  .

Use of each SOC component -

INA168 - To amplify voltage across shunt as our our requirement as data given . We had measured voltage across shunt ranging from 3mv to

                  50mv  and we want voltage output ranging from 3v to 10v (linear ).

UJT(Unijunction Transistor ) - this is acting as a ujt-relaxation-oscillator for coulomb counting method for current measurement .

out put of UJT is impulses due to capacitor get discharge when capacitor get charged upto a contant voltage and UJT get triggered and we get impulse at UJT outputside . From Arduino uno we calculate impulse and calculate actual current flowing through the circuit .

- Capacitor charged upto a constant voltage if current flowing through the main power traing changes then distance between impulse vary

 because as current increases  capacitor charges faster and get discharge faster so we get impulse faster and we know charge of capacitor    

Q = C * V.  Q is constant because  C is constant and V is constant ,V is constant because UJT triggering voltage is constant .

- I had  attached my simulation file which is done on Proteus simulation software .

- I had also attached my arduino program file . In this arduino  I had write programme  .

- We don't know about shunt resistance but voltage across it we had measured as above through multimeter.

- Sir now all things I had given to you but this all depend upon INA168 which is not amplifing according my requirement . Please help .

Sincerely,

Tarun Singhal

This is the power train of our ATV.

Sir , I need your one more help that I have given you all the details of my ATV power train and I want to measure how much our battery get discharged when our ATV is running and during running condition current through battery is varying if I use INA 240 across Shunt resistor in Power train and for counting pulses  i am using my UJT Relaxation OSCILLATION circuit .

Sir , I think  you have got all the idea what i am trying to do So according to you what should I do .