Project Name:$-$

ADC$\_$Compare$\_$ANO$\_$AN$3$

Description:$-$ This program reads the Analog voltage from the potentiometers on inputs $"$AN$0($RA$0)"$ and $"$AN$3($RA$3).$ If the input voltage on pin AN$0$ is greater thanor equal to AN$3$ then the LED connected to pin RB$0$ is turned ON$,$ otherwise it is turned off.

Instructions:$-$

$1.$ Create a macro name for the LED:$-$

E$.$g$.\backslash$#define LED RB$0$

$2.$ Create a macro name for ON and OFF:$-$

E$.$g$.\backslash$#define ON $1$

$\backslash$#define OFF $0$

$3.$ Use the macros listed above in your program.

$4.$ Setup RB$0$ pin as a Digital Output.

$5.$ Setup AN$0/$RA$0$ pin and AN$3/$RA$3$ pin as Analog inputs.

$6.$ Setup the ADC as follows $($see ADCONO $\backslash$& ADCON$1$ registers on pages $114/115$ of the PIC$16$F$188$ Datasheet$)$:$-$

ADCON$0$

$-$ Setup "ADCS $\backslash (<mn>1</mn>$: $0>\backslash )"$ bits to select the internal RC oscillator

$-$ Setup $"$CHS$<mn>2</mn>$:$0>"$ to select Channel $0($i$.$e$.$ RA$3/$AN$3)$

$-$ Setup "ADON" bit to turn on A$/$D module

ADCON$1$

$-$ Setup "ADFM" bit to select Left Justified result

$-$ Setup "ADCS$2"$ bit as disabled

$-$ Setup $"$VCFG $\backslash (<mn>1</mn>$: $0>\backslash )"$ bits to use AVDD and AVss

$7.$ Create two $8-$bit variables called "adc$\_$val$0"$ and "adc$\_$val$3"$ to store the value of the two ADC results from each channel $($i$.$e$.$ Channel $0$ and Channel $3).$

$8.$ Inside a continuous loop, call a function $($explained below$)$ twice in succession that returns the ADC value for channel $0$ and channel $3$ into the variables "adc$\_$val$0"$ and "adc val$3"$ respectively. If the voltage on AN$0($RA$0)$ is greater than or equal to AN$3($RA $\backslash (\backslash$overline$\{3\}\backslash ))$ then turn on the LED connected to RB$0,$ othwerwise turn off the LED.

$9.$ Create a function with the following function header:$-$

unsigned char get$\_$adc$\_$val$($unsigned char channel$)$

where,

channel equals ADC Channel number

unsigned char equals the $8-$bit result retuned from the $\backslash ($ A D C $\backslash )$

$-$ Inside the function do the following:$-$

$-$ Set the channel using the C statement $\backslash (\backslash$rightarrow $\backslash )$ ADCON$0$bits.CHS $\backslash (=$x x $\backslash )$;

$-$ Insert a $10$uSec delay to allow the ADC to switch channel $\backslash (\backslash$rightarrow $\backslash )\_\_$delay$\_$us$($xx$)$;

$-$ Start the ADC Conversion.

$-$ Wait for the ADC conversion to finish.

$-$ Return the ADC result from the function.

$10.$ Add comments to your code $($marks lost for no comments$).$

$11.$ Ensure all code is properly indented $($i$.$e$.$ marks lost for no indentation$).$

Inputs:$-2($i$.$e$.$ AN$0($RA$0),$ AN$3($RA$3))$

Outputs:$-1($i$.$e RB$0)$