Using LCD display
This example illustrates the use of an alphanumeric LCD display. The function libraries simplify this program, which means that the effort made to create software pays off in the end. A message written in two lines appears on the display: mikroElektronika LCD example Two seconds later, the message in the second line is changed and displays voltage present on the A/D converter input (the RA2 pin). For example: mikroElektronika voltage:3.141V In true device, the current temperature or some other measured value can be displayed instead of voltage. In order to make this example work properly, it is necessary to tick off the following libraries in the Library Manager prior to compiling:/*Header******************************************************/ // LCD module connections sbit LCD_RS at RB4_bit; sbit LCD_EN at RB5_bit; sbit LCD_D4 at RB0_bit; sbit LCD_D5 at RB1_bit; sbit LCD_D6 at RB2_bit; sbit LCD_D7 at RB3_bit; sbit LCD_RS_Direction at TRISB4_bit; sbit LCD_EN_Direction at TRISB5_bit; sbit LCD_D4_Direction at TRISB0_bit; sbit LCD_D5_Direction at TRISB1_bit; sbit LCD_D6_Direction at TRISB2_bit; sbit LCD_D7_Direction at TRISB3_bit; // End LCD module connections unsigned char ch; // unsigned int adc_rd; // Declare variables char *text; // long tlong; // void main() { INTCON = 0; // All interrupts disabled ANSEL = 0x04; // Pin RA2 is configured as an analog input TRISA = 0x04; ANSELH = 0; // Rest of pins are configured as digital Lcd_Init(); // LCD display initialization Lcd_Cmd(_LCD_CURSOR_OFF); // LCD command (cursor off) Lcd_Cmd(_LCD_CLEAR); // LCD command (clear LCD) text = "mikroElektronika"; // Define the first message Lcd_Out(1,1,text); // Write the first message in the first line text = "LCD example"; // Define the second message Lcd_Out(2,1,text); // Define the first message ADCON1 = 0x82; // A/D voltage reference is VCC TRISA = 0xFF; // All port A pins are configured as inputs Delay_ms(2000); text = "voltage:"; // Define the third message while (1) { adc_rd = ADC_Read(2); // A/D conversion. Pin RA2 is an input. Lcd_Out(2,1,text); // Write result in the second line tlong = (long)adc_rd * 5000; // Convert the result in millivolts tlong = tlong / 1023; // 0..1023 -> 0-5000mV ch = tlong / 1000; // Extract volts (thousands of millivolts) // from result Lcd_Chr(2,9,48+ch); // Write result in ASCII format Lcd_Chr_CP('.'); ch = (tlong / 100) % 10; // Extract hundreds of millivolts Lcd_Chr_CP(48+ch); // Write result in ASCII format ch = (tlong / 10) % 10; // Extract tens of millivolts Lcd_Chr_CP(48+ch); // Write result in ASCII format ch = tlong % 10; // Extract digits for millivolts Lcd_Chr_CP(48+ch); // Write result in ASCII format Lcd_Chr_CP('V'); Delay_ms(1); } }