【Follow me Season 2 Episode 2】Task Summary Post

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【Follow me Season 2 Episode 2】Task Summary Post [Copy link]

This post was last edited by eew_gz8e7C on 2024-10-7 15:30

1. Video Introduction

2. Task Implementation

2.1 Getting Started Task (Required): Build the environment and start the first step Blink / Serial port print Hello EEWorld!

Software Process:

Code:

void setup() {
  // put your setup code here, to run once:
  //配置波特率
  Serial.begin(115200);
  while (!Serial) { }
  //配置LED引脚为输出模式
  //pinMode(102, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  //演示控制板载LED亮灭，并且打印LED状态
  digitalWrite(LED_BUILTIN, LOW);
  printf("LED ON\n");
  delay(1000);
  digitalWrite(LED_BUILTIN, HIGH);
  printf("LED OFF\n");
  delay(1000);
}

Effect display:

blink_print

Implementation process:

【Follow me Season 2 Issue 2】Unboxing + Environment Building + Blink & Serial Printing - DigiKey Technology Zone - Electronic Engineering World - Forum (eeworld.com.cn)

2.2 Basic tasks (must be done): drive 12x8 dot matrix LED; use DAC to generate sine wave; use OPAMP to amplify DAC signal; use ADC to collect and print data to serial port and other interfaces to upload to host computer to display curve

Software Process:

Code:

// LED_MX
#include "Arduino_LED_Matrix.h"  //调用LED_Matrix库

ArduinoLEDMatrix matrix;  //实例化点阵对象

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);  //设置波特率

  matrix.begin();  //点阵使能

  byte frame[8][12] = {
    { 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0 },
    { 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0 },
    { 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0 },
    { 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0 },
    { 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0 },
    { 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 },
    { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
  };  //点阵爱心数据

  matrix.renderBitmap(frame, 8, 12);  //点阵渲染显示
}

void loop() {
  // put your main code here, to run repeatedly:
}

//DAC

#include "analogWave.h" 

analogWave wave(DAC);   // 使用DAC引脚实例化模拟曲线对象wave

float freq = 0.5;  // 设置曲线初始频率

void setup() {
  Serial.begin(115200);  // 串口波特率
  wave.sine(freq);       // 使用模拟曲线对象wave按照初始频率生成正弦波
  wave.amplitude(0.5);
}

void loop() {
  printf("%d\n",analogRead(A4)); // 读取正弦值
  delay(100);
}

//OPAMP

#include "analogWave.h" 
#include <OPAMP.h>
analogWave wave(DAC);   // 使用DAC引脚实例化模拟曲线对象wave

float freq = 1;  // 设置曲线初始频率

void setup() {
  Serial.begin(250000);  // 串口波特率
  OPAMP.begin(OPAMP_SPEED_HIGHSPEED); //设置OPAMP
  wave.sine(freq);       // 使用模拟曲线对象wave按照初始频率生成正弦波
  wave.amplitude(0.4);  //设置正弦曲线幅值为0.4
}

void loop() {
  printf("%d\n",analogRead(A4)); // 读取DAC输出正弦值
  Serial.print(" ");
  printf("%d\n",analogRead(A5)); // 读取OPAMP输出正弦值
  delay(100);
}

Effect display:

LED_MX

DAC

OPAMP

Implementation process:

【Follow me Season 2 Issue 2】Basic Task Dot Matrix + DAC Sine Wave + OPAMP Amplification + Serial Port Printing and Curve Output - DigiKey Technology Zone - Electronic Engineering World - Forum (eeworld.com.cn)

2.3 Advanced Task (Must Do): Connect to the open source smart home platform HA (HomeAssistant) via Wi-Fi using the MQTT protocol

Software Process:

Code:

#include <ArduinoMqttClient.h>
#include <WiFiS3.h>
#include "secrets.h"

//wifi信息
char ssid[] = WIFISSID;    
char pass[] = WIFIPWD;   

//mqtt服务器信息
const char broker[] = BROKER;
const int port = BROKER_PORT;

//mqtt客户端
WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);

//最大重连次数
const int maxTryTimes = 10;

//测试用发送订阅主题
const char sendTopic[]  = "HA/echo";

//测试用接收订阅主题
const char backTopic[]  = "HA/back";

//发送间隔
const long interval = 1000;
unsigned long previousMillis = 0;

int count = 0;

void setup() {
  //初始化串口
  Serial.begin(115200);
  while (!Serial) {
    ; 
  }

  // 连接WIFI
  Serial.print("Attempting to connect to WPA SSID: ");
  Serial.println(ssid);
  while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }

  Serial.println("You're connected to the network");
  Serial.println(WiFi.localIP());


  Serial.print("Attempting to connect to the MQTT broker: ");
  Serial.println(broker);

  int tryTimes=0;

  //连接MQTT服务器
  while (!mqttClient.connect(broker, port)) {
    Serial.print("MQTT connection failed! Error code = ");
    Serial.println(mqttClient.connectError());
    if (tryTimes>maxTryTimes-1)
    {
      printf("MQTT connection failed over %d times",maxTryTimes);
      while(1){};
    }
    delay(500);
    printf("Try more %d times\n",++tryTimes);
  }

  Serial.println("You're connected to the MQTT broker!");
  Serial.println();

  Serial.print("Subscribing to topic: ");
  Serial.println(backTopic);
  Serial.println();

  //订阅主题
  mqttClient.subscribe(backTopic);


  Serial.print("Waiting for messages on topic: ");
  Serial.println(backTopic);
  Serial.println();
}

void loop() {
  // 查看主题消息
  int messageSize = mqttClient.parseMessage();
  if (messageSize) {
    // we received a message, print out the topic and contents
    Serial.print("Received a message with topic '");
    Serial.print(mqttClient.messageTopic());
    Serial.print("', length ");
    Serial.print(messageSize);
    Serial.println(" bytes:");

    // 打印输出主题消息
    while (mqttClient.available()) {
      Serial.print((char)mqttClient.read());
    }
    Serial.println();

    Serial.println();
  }

  unsigned long currentMillis = millis();

  //发送测试消息到主题
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    Serial.print("Sending message to topic: ");
    Serial.println(sendTopic);
    Serial.print("echo ");
    Serial.println(count);

    mqttClient.beginMessage(sendTopic);
    mqttClient.print("echo ");
    mqttClient.print(count);
    mqttClient.endMessage();

    Serial.println();

    count++;
  }
}

Effect display:

MQTT

Implementation process:

【Follow me Season 2 Episode 2】Advanced Task: MQTT protocol access to open source smart home HomeAssistant - DigiKey Technology Zone - Electronic Engineering World Forum (eeworld.com.cn)

2.4 Extended Tasks Upload the light intensity to HA through an external ambient light sensor and display the data on the HA panel + upload the temperature and humidity to HA through an external temperature and humidity sensor and display the data on the HA panel

Software Process:

Code:

//LIGHT

#include "secrets.h"
#include <WiFiS3.h>
#include <ArduinoHA.h>
#include <Wire.h>

#define LIGHT_SENSOR A4

//wifi信息
char ssid[] = WIFISSID;
char pass[] = WIFIPWD;

//mqtt服务器信息
const char broker[] = BROKER;
const int port = BROKER_PORT;

byte mac[] = { 0x00, 0x10, 0xFA, 0x6E, 0x38, 0x4A };
//tcp客户端
WiFiClient client;
//HA虚拟设备配置
HADevice device(mac, sizeof(mac));
//mqtt客户端实例化
HAMqtt mqtt(client, device);

//HA传感器实例化
HASensorNumber lightSensor("LightSensor", HABaseDeviceType::PrecisionP2);

//参考上次更新时间
unsigned long lastUpdateAt = 0;


//光线传感器
void getLightValue(float* const pval) {
  int sensorValue = analogRead(LIGHT_SENSOR);
  *pval = sensorValue/1023.0;
}



void setup() {
  //初始化串口
  Serial.begin(115200);
  while (!Serial) {
    ;
  }

  // 连接WIFI
  Serial.print("Attempting to connect to WPA SSID: ");
  Serial.println(ssid);
  while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }

  Serial.println("You're connected to the network");
  Serial.println(WiFi.localIP());


  Serial.print("Attempting to connect to the MQTT broker: ");
  Serial.println(broker);

  device.setName("亮度");
  device.setSoftwareVersion("1.0.0");


  lightSensor.setIcon("mdi:home");
  lightSensor.setName("亮度");
  lightSensor.setUnitOfMeasurement("%");

  mqtt.begin(BROKER, BROKER_PORT);
}

void loop() {
  mqtt.loop();
  float light;
  if ((millis() - lastUpdateAt) > 1000) {  
    lightSensor.setValue(light*100);
    Serial.print("light:");
    Serial.print(light*100);
    Serial.println("%");
    lastUpdateAt = millis();
  }
}

//TEMP&HUMI

#include "secrets.h"
#include <WiFiS3.h>
#include <ArduinoHA.h>
#include <Wire.h>
#include "AHT20.h"

//wifi信息
char ssid[] = WIFISSID;
char pass[] = WIFIPWD;

//mqtt服务器信息
const char broker[] = BROKER;
const int port = BROKER_PORT;

byte mac[] = { 0x00, 0x10, 0xFA, 0x6E, 0x38, 0x4A };
//tcp客户端
WiFiClient client;
//HA虚拟设备配置
HADevice device(mac, sizeof(mac));
//mqtt客户端实例化
HAMqtt mqtt(client, device);

//HA传感器实例化
HASensorNumber tempSensor("tempSensor", HABaseDeviceType::PrecisionP2);
HASensorNumber humiSensor("humiSensor", HABaseDeviceType::PrecisionP2);

//参考上次更新时间
unsigned long lastUpdateAt = 0;

//温湿度传感器AHT20
AHT20 AHT;



void setup() {
  //初始化串口
  Serial.begin(115200);
  while (!Serial) {
    ;
  }
  AHT.begin();

  // 连接WIFI
  Serial.print("Attempting to connect to WPA SSID: ");
  Serial.println(ssid);
  while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }

  Serial.println("You're connected to the network");
  Serial.println(WiFi.localIP());

  //设置MQTT服务器
  Serial.print("Attempting to connect to the MQTT broker: ");
  Serial.println(broker);

  //设置HA虚拟设备信息
  device.setName("温湿度");
  device.setSoftwareVersion("1.0.0");


  tempSensor.setIcon("mdi:home");
  tempSensor.setName("温度");
  tempSensor.setUnitOfMeasurement("°C");

  humiSensor.setIcon("mdi:home");
  humiSensor.setName("湿度");
  humiSensor.setUnitOfMeasurement("%");

  mqtt.begin(BROKER, BROKER_PORT);
}

void loop() {
  mqtt.loop();
  float humi, temp, light;
  if ((millis() - lastUpdateAt) > 1000) {  
    int ret = AHT.getSensor(&humi, &temp);
    if (ret) {
      tempSensor.setValue(temp);
      humiSensor.setValue(humi * 100);
      Serial.print("humidity: ");
      Serial.print(humi * 100);
      Serial.print("%\t temerature: ");
      Serial.println(temp);
    }
    lastUpdateAt = millis();
  }
}

Effect display:

Implementation
process :

【Follow me Season 2, Issue 2】Extended Task HA Panel Displays Temperature, Humidity, and Illuminance Data - DigiKey Technology Zone - Electronic Engineering World - Forum (eeworld.com.cn)

3. Experience

After work, I was able to learn and master the use of uno r4 wifi through forum activities, and I gained a deep understanding of the use of the open source smart home Home Assistant system. Although I encountered many problems in the process, I solved them all by communicating with forum friends. Thanks to eeworld and Digi-Key for providing the event opportunity. I wish similar events will continue to be better and better.

4. Task Code Summary

https://download.eeworld.com.cn/detail/eew_gz8e7C/634546