convert adc value in to multiples

[asthra123]

dear sir,
how can we convert an input voltage 0-5 volts to 0-500 (measuring parameter) and show in to windows foam (visual c#).
i am using pic16f877 programmed in assembly ...
i can receive the actual input voltage (0-5) from uart (RS232) in windows foam in visual c#.how to show the multiples of 10 or 100 ?
please help me.
seby

 

[jayanth.devarayanadurga]

volt = volt * 5 / 1023; //for 10 bit adc

//The above gives 5V for 5V


//If 5V has to be represented as 500 then you have to multiply by 100


volt = volt * 500 / 1023;

//if volt is 1023 (1023 raw adc value = 5V) then
//1023 * 500 / 1023 = 500

 

[Venkadesh_M]

data = ADC_value*500/1023; don forget multiply divide sequence

(this is for 10 bit adc.. put( ( 2^number_of_bits ) - 1 ) in 1023s place for various bit lengths....

 

[FvM]

Microcontroller datasheets (e.g. from Microchip) keeps pretending that an ADC LSB is Vref/1024 rather than Vref/1023.

 

[ravikumar001]

In assembly you not sent a raw bit, it may cause receive problem because it send control char too for certain ADC value.

you need to divide into 3 char such as 0011 1111 1111 send as adc::123;

in c# read char 1,2,3 separately by ref of adc:: and ;

and finally can convert actual value by simple math functions.

 

[Venkadesh_M]

Microcontroller datasheets (e.g. from Microchip) keeps pretending that an ADC LSB is Vref/1024 rather than Vref/1023.

but the value 3FF (10bit)
is 1023 isnt it?

 

[asthra123]

thanks
i can solve this problem
seby