Mastering ADC Functions on the Nuvoton Microcontroller Board: A Comprehensive Guide

In this tutorial, you'll discover how to utilize the Analog-to-Digital Converter (ADC) and its functionalities on the Nuvoton Microcontroller Board. Various sensors in electronics, such as MQ gas sensors and the ADXL335 Accelerometer, output analog signals. By employing ADCs, these sensors can be interfaced with a microcontroller unit. By the end of this guide, you will be equipped to integrate any analog sensor with a Nuvoton board, enabling you to read and process sensor data effectively.


Project Overview: Using a Potentiometer with the Nuvoton MS51FB9AE Development Board

In this project, we will use a potentiometer as a variable analog input and the Nuvoton MS51FB9AE Development Board to demonstrate ADC functionality.

Nuvoton MS51FB9AE Development Board Introduction

The Nuvoton MS51FB9AE is an 8-bit high-performance microcontroller based on the 1T 8051 architecture, running up to 24 MHz. It features 16 KB of flash memory, 1 KB of SRAM, and 4 KB of loader ROM for in-system programming (ISP). The board is equipped with a wealth of peripherals, including:

- 2 UART sets

- 1 I²C set

- 1 SPI set

- 18 GPIO pins

- 8 channels of 12-bit ADC

- Watchdog Timer

- Window Watchdog Timer

- 6 PWM channels (16-bit each)

Let's dive into interfacing a potentiometer with the Nuvoton ADC.

Hardware Requirements

For this project, you'll need:

- Nuvoton MS51FB9AE microcontroller-based development board

- Nu-Link Programmer

- Character LCD 16x2

- 1k ohm resistor

- 10k ohm potentiometer

- Breadboard

- Jumper wires

Software Requirements

To write and upload the code for the Nuvoton MS51FB9AE module, you'll need Keil software.

Connections

LCD Connections:

- RS: P04

- EN: P03

- D4: P01

- D3: P00

- D2: P10

- D1: P11

Connect the Nu-Link programmer to the board via USB from your PC to upload the code. The potentiometer, acting as a voltage divider, is connected to the analog input 0 (AN0), which corresponds to Pin P1.7.

Schematic Overview

In the schematic, Port P0 is designated for LCD connections. The programming interface connection is shown on the far left. The potentiometer's voltage division is sensed by the analog input 0 (AN0).

Code Implementation

Using Keil for this project, you'll need the LCD and MS51FB9AE libraries for proper debugging. Download the 16x2 LCD Library and MS51 library, then add `lcd.c`, `lcd.h`, and `ms51.h` files to your main Keil project.

Output

After uploading the code successfully, start the input supply and vary the potentiometer connected to the ADC pin. The ADC value and corresponding voltage will be displayed on the LCD. The ADC value ranges from 0 to 4096 (for a 12-bit ADC). By calibrating further, you can achieve more precise readings according to your requirements.

Conclusion

Using this method, you can effectively integrate the Nuvoton microcontroller with various analog sensors. This foundational knowledge allows you to build sophisticated projects with the Nuvoton development board, exploring applications from simple sensors to complex industrial systems. The Nuvoton modules are versatile and can be used in diverse applications such as thermostats, Bluetooth speakers, infrared sensing, battery chargers, and IoT devices. For industrial applications, they are suitable for rail safety devices, infrared astronomy, optical power meters, and large-scale IoT projects.

For a wide range of electronic components and Nuvoton microcontrollers, visit Campus Component -Electronic Component Suppliers, your go-to online store for electronics.




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