基于PIC16F877A单片机的智能灯光

// CONFIG #pragma config FOSC = XT // Oscillator Selection bits (XT oscillator) #pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled) #pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled) #pragma config BOREN = OFF // Brown-out Reset Enable bit (BOR disabled) #pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming) #pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off) #pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control) #pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off) #include <xc.h> #include "ee302lcd.h" // Include LCD header file #include <stdio.h> // Include Standard I/O header file #include "I2C_EE302.h" #define GREEN_LED RC0 // Define RC0 as GREEN_LED #define RED_LED RC1 // Define RC1 as RED_LED #define KEY1 RB2 //label RB2 as key1 #define KEY2 RB3 //label RB3 as key2 unsigned char outString[5]; //character array for LCD string unsigned char outString2[5]; //存放光照阈值 用于显示 int adc_value, volts, decivolts; //used to store the conversion of ADC value to volts and decivolts. int light; //value of light threshold int int_num; char flag=0; //串口发送 void transmit_string (char *p) { while (*p != '\0') //While string does not equal Null character //do the following. { while (!TXIF); //Wait until TXREG empty. TXREG = *p; //Load TXREG with character from string pointed to p++; // by p, then increment p. } } void do_adc(void) { __delay_us(30); //Acqusition time delay set to 30us (>19.7us) GO_nDONE=1; //Start ADC conversion while(GO_nDONE)continue; //Wait until conversion finishes adc_value = ADRESH; //Pass ADRESH value to adc_value variable sprintf(outString,"%d",ADRESH); Lcd8_Clear(); //clear LCD Lcd8_Write_String(outString); } //设置光照阈值 当测到的光照大于阈值时，亮灯 用两个按键设置+和- void set_threshold(void) { if(KEY1==0) { __delay_ms(100); if(KEY1==0) light+=10; } if(KEY2==0) { __delay_ms(100); if(KEY2==0) light-=10; } } //根据AD的值和阈值 判断要不要开灯 再将阈值显示到LCD 并将其存入到EEPROM中 void jugle(void) { if(adc_value>=light) //如果光照太强 那么关灯 GREEN_LED=0; else //光照太弱 开灯 GREEN_LED=1; sprintf(outString2,"%d",light); Lcd8_Set_Cursor(2,0); // select line 2 of LCD Lcd8_Write_String(outString2); write_ext_eeprom(0x00, 0x01, light); //store the data to eeprom transmit_string(outString); //将测到的光照强度通过串口打印出去 } void main(void) { i2c_init(); //do i2c intialisation, TRISC modified here Lcd8_Init(); // Required initialisation of LCD to 8-bit mode TRISC=0x00; // Ensure LEDs are set as outputs RC0, RC1 TRISB=0x0C; // Set PORTB bit 2 3 as input for switch PORTB=0X0C; //enable internal pull up OPTION_REG=0X00; //turn on pull up in port B //iic TRISC |= 0x18; // RC6 and RC7 must be configured as inputs to enable the UART // RC4 and RC3 high from I2C_init TRISA=0x04; // Set PORTA bit 3 as input for AN2 ADCON0 = 0b01010001; // ADCS1:ADCS0 set to 0:1 for Tosc x8 (Fosc/8) // Channel 2 // ADC On ADCON1 = 0b00000010; // Left justified result // ADCS2 = 0 for Tosc x8 (Fosc/8) // RA2/AN2 selected as analog input // Vref+ : Vdd Vref- : Vss // AN7, AN6 and AN5 selected for Digital I/O for LCD //USART TRISC |= 0xC0; // RC6 and RC7 must be configured as inputs to enable the UART TXSTA = 0x24; // Set TXEN and BRGH RCSTA = 0x80; // Enable serial port by setting SPEN bit SPBRG = 0x19; // Select 9600 baud rate. //TIMER1 T1CON = 0x11; //enables timer1, sets it to internal clock, sets prescaler to x2 //(this was done to half frequency of LED's to correct value) TMR1H = 0xEC; //set 60535 --->65535-60535=5000. TMR1L = 0x77; //5000*2us = 10ms INTCON = 0xC0; //enables global interrupts and peripherial interrupts TMR1IE = 1; //enables timer1 interrupt TMR1IF = 0; //clear Timer 1 interrupt flag light=read_ext_eeprom(0x00, 0x01); // Read byte at address 0x0001 on EEPROM while(1) { if(flag==1) { flag=0; do_adc(); jugle(); } set_threshold(); } } void __interrupt() isr() { //interrupt service routine if (TMR1IF == 1) //Check if Timer1 Interrupt? { TMR1IF=0; //resets timer1 interrupt flag TMR1H = 0xEC; //Pre-load Timer1 so it is not counting from 0. TMR1L = 0x77; //sets timer to 3035 -> 65535 - 3035 = 62500 //62500*2us = 0.125s) -> on/off = 4Hz flag=1; } }