Interfacing IR Sensor with Nuvoton Board

Let’s begin to interface IR sensors with Nuvoton.

Hardware Requirements:

For this project, we will use the below components-

• Nuvoton MS51FB9AE microcontroller-based development board

• Nu-Link Programmer

• Character LCD 16x2

• 1k resistor

• IR Sensor

• Breadboard

• Few Jumper wires

Software requirement:

To write a code for Nuvoton MS51FB9AE module we would require Keil software.

Connections:

For LCD related connection:

RS - P04

EN - P03

D4 - P01

D3 - P00

D2 - P10

D1 - P11

Connect the Nu-Link programmer to the board through USB from your PC to upload code.. The Input from IR Sensor is sensed by the analog input 0 (AN0), Pin P1.7 which is Analog input channel 0 is used to interface IR sensor.

Code:

As we are using Keil for this project you would be requiring a powerful LCD and MS51FB9AE library for proper debugging the Output from our IR sensor, Download 16x2 LCD Library for Nuvoton MS51FB9AE from here and download MS51 library here.

After downloading just add lcd.c and lcd.h and ms51.h files in your main KeilMS51FB9AE project.

#include "ms51.h"

#include "SFR_Macro.h"

#include "Function_define.h"

#include "Common.h"

#include "Delay.h"

#include "lcd.h"

#define bit_to_voltage_ratio 0.001220703125 // 5.0V divided by 4096 For 12-Bit ADC

void setup (void);

unsignedintADC_read(void);

float voltage;

charstr_voltage[20];

void main(void){

intadc_data;

setup(); 

lcd_com (0x01);

while(1){

lcd_com (0x01);

lcd_com (0x80);

lcd_puts("ADC Data: ");

adc_data = ADC_read();

lcd_print_number(adc_data);

voltage = adc_data * bit_to_voltage_ratio;

sprintf(str_voltage, "Volt: %0.2fV", voltage);

lcd_com(0xC0);

lcd_puts(str_voltage); 

 Timer0_Delay1ms(500);

 }

 }

void setup (void){

Set_All_GPIO_Quasi_Mode;

lcd_init();

 Enable_ADC_AIN0;

lcd_com (0x80);

LCD_ScrollMessage("Welcome to CampusComponent");

lcd_com (0x80);

lcd_puts("IR sensor Interfacing");

lcd_com (0xC0);

lcd_puts ("With MS51FB9AEmcu");

 Timer3_Delay100ms(5);

}

unsignedintADC_read(void){

register unsigned intadc_value = 0x0000;

clr_ADCF;

set_ADCS; 

while(ADCF == 0);

adc_value = ADCRH;

adc_value<<= 4;

adc_value |= ADCRL;

returnadc_value;

}

Output:

After successfully uploading of the code, 

Start the Input supply and place any object within the range i.e. 20cm infront of the IR Sensor, the voltage given to the ADC pin will show some change and we can notice the ADC value and Analog voltage displayed on the LCD.

When there is no object present in the line of sight of IR Sensor the LCD will show the ADC value of 4096, and when the object is present this value will start to drop, as you move the object close to the IR Sensor you can see a major drop in the ADC data value. From this we can detect any object and also how far the object is present from the Device.

 By further calibration you can achieve more accurate values and you work with it as per your requirements.

Conclusion:

Using above process you can make Nuvoton and IRmodule work as per your application. There are many high end industrial projects you can build and explore using Nuvoton. There are different modules from Nuvoton which comes with more addon functionality and hardware peripherals which are available at Campus Component.

The Nuvoton module can be used in varied applications such as Thermostat, Bluetooth Speaker, Infrared Sensing, Battery charger, Small IoT appliances. In terms industrial projects we can use Nuvoton Module to build Rail safety devices, Infrared Astronomy, optical power meters and Large scale IoT project.

If you are looking for electronic components and different microcontrollers from Nuvoton, reach out Campus Component today!