Add ADC for LDR to change brightness on ambient light.

3 files changed, 59 insertions, 27 deletions

diff --git a/conf.h b/conf.h
index 4f5f5b3..cbf5468 100755
--- a/conf.h
+++ b/conf.h
@@ -14,7 +14,7 @@
 // Use internal crystal at 8MHz

 #define _XTAL_FREQ 20000000

 

-//#define DEBUG 1

+#define DEBUG 1

 

 // Define baud rate of 9600

 #define Baud_rate 9600

@@ -36,4 +36,7 @@
 #define INCR RE2

 

 //Define Buzz

-#define BEEP RD1
\ No newline at end of file
+#define BEEP RD1

+

+//Define LDR

+#define LDR RA0
\ No newline at end of file
diff --git a/main.c b/main.c
index 87a53d0..72f3761 100755
--- a/main.c
+++ b/main.c
@@ -12,7 +12,21 @@
 #include "term.h"                          //Declarations for Escape codes

 #endif

 

+unsigned int Adc_Read(unsigned int channel) {

+    ADFM = 1;   // results right justified

+    ADCS0 = 1;  //conversion speed = 64*Tosc

+    ADCS1 = 1;

+    ADCS2 = 1;

+    ADCON0bits.CHS = channel;

+    ADON = 1;   // Turn on ADC

+    __delay_ms(1);

+    GO_DONE = 1;

+    while(ADCON0bits.GO_DONE == 1);

+    return((ADRESH << 8) + ADRESL); // ex 1024

+}

+

 int main() {

+    TRISA0 = 0x01; // RA is input (ADC)

     TRISC = 0x00; // Set PORTC as outputs

     PORTC = 0x00; // Set all PORTC pins LOW

 

@@ -30,7 +44,7 @@ int main() {
 

     I2C_Master_Init(100000); // Init I2C Master with 100KHz Clock

 #ifdef DEBUG

-    UART_send_string(CURSOR(13, 24)); // Set cursor at line 12, column 23

+    UART_send_string(CURSOR(13, 23)); // Set cursor at line 13, column 23

     UART_send_string(GREEN); // Set Green

     UART_send_string("I2C Module Initialized and active\r\n");

     UART_send_string(CLRATTR); // No color

@@ -38,7 +52,7 @@ int main() {
 

     Lcd_Init();

 #ifdef DEBUG

-    UART_send_string(CURSOR(14, 24)); // Set cursor at line 12, column 23

+    UART_send_string(CURSOR(14, 23)); // Set cursor at line 14, column 23

     UART_send_string(GREEN); // Set Green

     UART_send_string("LCD Module Initialized and active\r\n");

     UART_send_string(CLRATTR); // No color

@@ -52,7 +66,6 @@ int main() {
     display_Lcd_Layout();

 

     // Set an initial date time

-    //Set_Time_Date();

     //Set_Time();

     //Set_Date();

     //Set_DayOfWeek();

@@ -70,40 +83,40 @@ int main() {
 #ifdef VFD

     Vfd_Set_Brightness(3); //Max brightness 3 - minimum

 #endif

-    

+

     while (1) {

 

         // Set time and date variables from DS3231

-#ifdef DEBUG

-        UART_send_string("Updating current date time from DS3231\r\n");

-#endif

+        //#ifdef DEBUG

+        //        UART_send_string("Updating current date time from DS3231\r\n");

+        //#endif

         Update_Current_Date_Time();

 

         // Read temp

-#ifdef DEBUG

-        UART_send_string("Reading Alarms and Temperature");

-#endif

+        //#ifdef DEBUG

+        //        UART_send_string("Reading Alarms and Temperature");

+        //#endif

         Read_Alarms_Temp();

 

         // Get Alarm Status

         Get_Alarm_Status();

 

         // Separate the int timedate variables into chars

-#ifdef DEBUG

-        UART_send_string("Formatting chars");

-#endif

+        //#ifdef DEBUG

+        //        UART_send_string("Formatting chars");

+        //#endif

         format_DateTimeChars();

 

         // Format temperature

-#ifdef DEBUG

-        UART_send_string("Formating temperature");

-#endif

+        //#ifdef DEBUG

+        //        UART_send_string("Formating temperature");

+        //#endif

         format_Temperature();

 

         // Determine day of the week

-#ifdef DEBUG

-        UART_send_string("Determining day of week");

-#endif

+        //#ifdef DEBUG

+        //        UART_send_string("Determining day of week");

+        //#endif

         getWeekDay(dayOfWeek);

 

         // Enter loop and update display if sec changes from DS3231

@@ -114,6 +127,14 @@ int main() {
             // Set temp_sec to current sec from DS3231

             sec_chg = sec;

 

+            // Get current LDR reading

+            ldr = Adc_Read(0);

+

+            if (ldr_chg != ldr) {

+                Vfd_Set_Brightness(1024 / ldr);

+                ldr_chg = ldr;

+            }

+

 #ifdef DEBUG

             UART_send_string(CURSOR(19, 1));

             sprintf(buf, "%sTIME:%s\t%02d:%02d:%02d\r\n", YELLOW, CLRATTR,

@@ -130,8 +151,9 @@ int main() {
             sprintf(buf, "%sWKDAY:%s\t%d\t\t%sDAY:%s\t%s\r\n", YELLOW, CLRATTR,

                     dayOfWeek, YELLOW, CLRATTR, weekday);

             UART_send_string(buf);

-            sprintf(buf, "%sTEMP:\t%s%c%c%c.%c%cC%s", YELLOW, CLRATTR,

-                    temp_sign, temp_2, temp_1, temp_0, 0xB0, CLRATTR);

+            sprintf(buf, "%sTEMP:\t%s%c%c%c.%c%cC%s\t\t%sLDR:%s\t\%d\r\n",

+                    YELLOW, CLRATTR, temp_sign, temp_2, temp_1, temp_0, 0xB0,

+                    CLRATTR, YELLOW, CLRATTR, ldr);

             UART_send_string(buf);

 #endif

         }

diff --git a/main.h b/main.h
index aaec162..0b0ce43 100755
--- a/main.h
+++ b/main.h
@@ -1,9 +1,13 @@
+// Initialize variable for LDR

+unsigned int ldr = 0;

+unsigned int ldr_chg = 0;

+

 // Initialize variables for date time and alarms

-unsigned int sec = 30;

-unsigned int min = 42;

-unsigned int hour = 21;

+unsigned int sec = 0;

+unsigned int min = 45;

+unsigned int hour = 16;

 unsigned int dayOfWeek = 1;

-unsigned int date = 27;

+unsigned int date = 28;

 unsigned int month = 7;

 unsigned int year = 19;

 unsigned int century = 20;

@@ -40,6 +44,9 @@ unsigned char alarm2_min_0, alarm2_min_1, alarm2_hour_0, alarm2_hour_1;
 char buf[40];

 #endif

 

+// Get ADC value

+unsigned int Adc_Read(unsigned int);

+

 // Format unsigned int to unsigned chars

 void format_DateTimeChars(void);