/ Freq_Meter

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Ammeter_Code.cpp

Committer:
thomasosullivan
Date:
2020-04-01
Revision:
3:b6e887e4ac75
Parent:
0:7f4ed364f7ea

File content as of revision 3:b6e887e4ac75:

/*
the ammeter reads the voltage accross the shunt resister that is a set value
this is used to calculate the current in the circuit
a value for current will be printed in mA on the LCD screen

*/


//Case x:
lcd.locate(0.0)
lcd.printf("Current: "); 


AnalogIn vo(A5);  //reads the voltage across rshunt

double vout= (3.3*vo)/4095; //converts from bits in the analog read
double rshunt = 0.01;       //set value for rshunt
int i;                      // declares a integer for i


i = vout/rshunt;           // equation to find i

if i<= 0.5{ 

ifinal= i*1000; //converts into amps to mA
lcd.locate(0,1);
lcd.printf(".3f mA", ifinal);
    }
else {
lcd.locate(0,1);
lcd.printf("out of range");
}
//if and else staments here are based in if the i that has been found is within the parameters