From f8a22ef73eb409d460cf4c4c5948b97ca41026a9 Mon Sep 17 00:00:00 2001
From: William Harrington <kb0iic@berzerkula.org>
Date: Sun, 28 Jul 2019 16:46:34 -0500
Subject: Add ADC for LDR to change brightness on ambient light.

---
 conf.h |  7 +++++--
 main.c | 64 +++++++++++++++++++++++++++++++++++++++++++---------------------
 main.h | 15 +++++++++++----
 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);
 
-- 
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