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| /* Project: Unit 02 - LCD | |
| Code: unit_02_05_temp_LM35.c | |
| Objective: In this project, the design of a digital thermometer is described. | |
| An analog temperature sensor (LM35DZ) is used to sense the temperature, | |
| and the temperature is displayed on an LCD:) | |
| The output voltage is given by | |
| LM35 is connected to PIC's channel A/D AN2 | |
| RE0: Temperature sensor LM35 | |
| Vo = 10 mV/°C | |
| Thus, for example, at 20°C, the output voltage is 200 mV, | |
| at 25°C it is 250 mV, and so on. | |
| LIB Note: Select on Library Manager the LCD library for mokroC PRO for PIC:) | |
| > ADC | |
| > LCD | |
| > Conversions | |
| > C_String | |
| Author: mikroelektronica, edited by J3 | |
| PIC Lessons: How to Start to Program PIC 18 - Step-by-step for Beginners! | |
| Hardware: Development Boards (OPTIONS): | |
| PicGenios: PIC18F4520 chip ( https://loja.microgenios.com.br/produto/kit-picgenios-pic18f4520-com-gravador-usb-microicd-licen-a-compilador-mikroc-pro-for-pic/23507 ) | |
| EasyPIC™ 7: PIC18F45K22 chip ( https://www.microchip.com/Developmenttools/ProductDetails/TMIK013 ) | |
| Software: Development Programmer/Debugger: | |
| PICkit™ 2 ( http://ww1.microchip.com/downloads/en/DeviceDoc/PICkit%202%20v2.61.00%20Setup%20A.zip ) | |
| mikroProg suite for PIC ( https://www.mikroe.com/blog/mikroprog-suite-for-pic-version-2-3-1-released ) | |
| The LCD is connected to the microcontroller as follows: | |
| easyPIC v7 board: microgenios board: | |
| Microcontroller LCD Microcontroller LCD | |
| =============== === =============== === | |
| RB0 D4 RB4 D4 | |
| RB1 D5 RB5 D5 | |
| RB2 D6 RB6 D6 | |
| RB3 D7 RB7 D7 | |
| RB4 E RE1 E | |
| RB5 R/S RE2 R/S | |
| GND RW GND RW | |
| PDL: is a free-format English-like text that describes the flow of control and data in a | |
| program. PDL is not a programming language. It is a collection of some keywords that enable | |
| a programmer to describe the operation of a program in a stepwise and logical manner: | |
| BEGIN | |
| Choose the board to work with (easyPIC or microgenios) | |
| Configure LCD module connections | |
| Configure PORTB as digital outputs | |
| Initialize the LCD | |
| Clear the LCD | |
| Set cursor off | |
| DO FOREVER | |
| Read temperature from channel 2 | |
| Convert reading into millivolts | |
| Divide by 10 to find the temperature in Degrees C | |
| Convert temperature into string | |
| Clear display | |
| Display Heading “Temperature” | |
| Display the temperature | |
| Wait 1s | |
| ENDDO | |
| END | |
| Date: Nov 2019 | |
| */ | |
| // PIC18F45K22 - easyPIC v7 Board | |
| // 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 | |
| // picMicrogenios board | |
| sbit LCD_RS at LATE2_bit; | |
| sbit LCD_EN at LATE1_bit; | |
| sbit LCD_D4 at LATD4_bit; | |
| sbit LCD_D5 at LATD5_bit; | |
| sbit LCD_D6 at LATD6_bit; | |
| sbit LCD_D7 at LATD7_bit; | |
| sbit LCD_RS_Direction at TRISE2_bit; | |
| sbit LCD_EN_Direction at TRISE1_bit; | |
| sbit LCD_D4_Direction at TRISD4_bit; | |
| sbit LCD_D5_Direction at TRISD5_bit; | |
| sbit LCD_D6_Direction at TRISD6_bit; | |
| sbit LCD_D7_Direction at TRISD7_bit; | |
| // End LCD module connections | |
| // Loop variable | |
| void main(){ | |
| unsigned char txt[14]; | |
| unsigned int temp; | |
| float mV; | |
| // For PIC18F45K22 | |
| #ifdef P18F45K22 | |
| ANSELB = 0; // Config all the PORTB's pins as digital | |
| #else // For PIC18F4520 | |
| ADCON1 |= 0X0F; // Config all ADC's pins as digital | |
| #endif | |
| Lcd_Init(); // Initialize LCD | |
| Lcd_Cmd(_LCD_CLEAR); // Clear display | |
| Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off | |
| // Do forever | |
| for(;;) | |
| { | |
| temp = ADc_Read(2); // Read from channel 2 | |
| mV = temp * 5000.0/1024.0; // Convert to mV | |
| mV = mV/10.0; // mV is now the Degrees C | |
| floatToStr(mV, txt); // Convert to string | |
| Lcd_cmd(_LCD_CLEAR); // Clear LCD | |
| Lcd_out(1,1,"Temperature"); // Display heading | |
| Lcd_Out(2,1,Txt); // Display temperature | |
| Delay_ms(1000); // Wait 1 s and repeat} | |
| } | |
| } |
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