Absolute value with 10bit ADC readings

[davefromnj]

Hello All,

I would like to take the absolute value of 2 unsigned 10bit adc readings. All I want is to see if the difference between these 2 10bit ADC readings is greater than 10.

I know about underflowing with subtraction, and that apparently you cannot use Abs() with unsigned variables.

IS THERE ANY WAY TO DO THIS IN A LESS CONVOLUTED MANNER?

So to find out if Delta ADC1-ADC2 is > 10. I am going to use the
following code:

unsigned long int adcvalue1;
unsigned long int adcvalue2;
unsigned long int result;
unsigned int holdingvariable_a;
unsigned int holdingvariable_b;

if (adcvalue1 > adcvalue2)
{
holdingvariable_a = adcvalue1;
holdingvariable_b = adcvalue2;
}

else
{
holdingvariable_a = adcvalue2;
holdingvariable_b = adcvalue1;
}

result = holdingvariable_a - holdingvariable_b;

if (result > 10)
{
perform an event.
}

else
{
perform a different event.
}

[Ken Johnson]

if ( a > b )
delta = a - b;
else delta = b - a;

Ken