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How to convert hex bytes from ADS 7825 to decimal and print them on seven segment?

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Nikunj Tanna

Nikunj Tanna

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Hi,

I've got a 16 bit output from ADS 7825, which is 16 bit adc. I've 6-seven segment displays. Now I want this 2 byte adc output on 7-segment.

So can anyone tell me how do i conversion of this hex bytes to decimal and then print them on seven segment??? The output is signed int. I am using ATMEGA 128 and codevision avr compiler..

NIKS
 

Re: ADS 7825 help

you have 16 bit ADC so your range is 0-FFFF (0-65535) so you need only 5 digit 7-segment display

to display it
1> convert the hex code to decimal
2> break this in to individual fig (e.g. 12345 to 1,2,3,4,5) and save it in different reg.
3> write code to interface 5 digit 7-seg. display in MUX fashion
4> convert the decimal code to 7-segment code (also depends on Commom cathod or common anode)
5> display it


EnJoy
:D
 

Re: ADS 7825 help

Actually, I've to display the voltage value on 7-segment. So the decimal value, I am getting from hex will be multiplied by the unit voltage.

I mean it will be multiplied by 5V/32768 and resulting in voltage which will be float value.

So I am asking how to display that.
I hope you got my question..

NIKS
 

Re: ADS 7825 help

Hello,

I still didn't get any idea on how to get decimal value. ADS 7825 gives a 2's complement output in 16 bit. I get that hex integer byte. Now I need to display the voltage value that is applied at analog input to 7 segment. So for that i need the value of that hex integer in decimal and then i'll multiply it with 5v/2^16 to get voltage value. I've tried a lot example and previous posts of this forum but I didn't get what i want. Please help me if anyone knows.

One question apart from this, Does ADS7825 gives signed output? I am getting negative values when i display it using printf in decimal. Nothing written about this in datasheet..

NIKS
 

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