eDOT：基于 Arduino 的精密时钟与气象站，内置红外遥控

组件与物料

必要工具与设备

• Flashforge Dreamer 3D 打印机

应用与在线服务

• Arduino IDE

项目详解

eDOT 简介

eDOT 是一款基于 Arduino 的精密时钟与气象站，内置红外接收器和自动亮度调节。设计易于扩展，可加装 Wi-Fi 模块等额外硬件。得益于六块 8x8 点阵 LED 显示屏，可展示内部传感器数据、自定义滚动消息或来自互联网的无线信息（RSS 等）。功耗极低，设计简洁优雅，结合玻璃面板与 3D 打印外壳。项目持续开发中，后续会更新。

3D 打印部件下载：Thingiverse

更多项目请访问我的 YouTube 频道：https://www.youtube.com/channel/UCbIomyFKzBiLHqEb2xv9GHQ

物料清单 (BOM)

• 1× 3D 打印左半身
• 1× 3D 打印右半身
• 1× 3D 打印左盖
• 1× 3D 打印右盖
• 2× 3D 打印脚垫
• 12× 3D 打印显示屏支架
• 1× 磨砂玻璃 240×75×5 mm
• 1× 橙色滤光片
• 6× Adafruit 8x8 点阵显示屏 Luckylight M1603095 (白光)
• 6× MAX7219 驱动板
• 1× USB 引出板
• 1× BME280 引出板
• 1× DS3231 芯片
• 1× IR 接收器 IRM-56384
• 1× 光敏电阻 LDR-07
• 1× ATMEGA328PU (Arduino 定制板)
• 6× OMRON 12mm 轻触开关

eDOTcore PCB

终于拿到 eDOT 控制板的首批原型。

前往 eDOTcore 项目页面

代码

eDOT：多功能精密气象站与时钟 Arduino

// eDOT: Versatile precision weather station and clock
// HISTORY
// 11/12/2105 Added measurement calibration coefficients
// 09/06/2016 Added automatic display brightness
// 09/06/2016 Added task scheduler
// 07/08/2016 Added eDOT splashscreen

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Max72xxPanel.h>
#include <Average.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#include "RTClib.h"
#include <EasyScheduler.h>

Adafruit_BME280 bme; // I2C
RTC_DS3231 rtc;

int pinCS = 10; // CS 接此引脚，DIN 接 MOSI，CLK 接 SCK (cf https://arduino.cc/en/Reference/SPI)
int numberOfHorizontalDisplays = 7;
int numberOfVerticalDisplays = 1;
Max72xxPanel matrix = Max72xxPanel(pinCS, numberOfHorizontalDisplays, numberOfVerticalDisplays);

#define TEMPERATURE 0
#define HUMIDITY 1
#define PRESSURE 2
#define TIME 3
#define DAY 4
#define DATE 5

float temp, tempavg; char tempf[8];
float hum, humavg; char humf[8];
float press, pressavg; char pressf[8];
int screen = 0;
long previousLEDMillis = 0;
long LEDInterval = 5000;
int screenMax = 5;
bool screenChanged = true;
float lightsens, screenBrt = 0, lightsensavg;

Average<float> avetemp(60);
Average<float> avehum(60);
Average<float> avepress(60);
Average<float> avelightsens(40);

// 校准系数
float temp_o = -1.70, temp_s = 1.0, temp_lin;
float hum_o = 2.45, hum_s = 1.0, hum_lin;
float press_o = 0.0, press_s = 1.0, press_lin;

// 亮度传感器修正
float brt_o = -4, brt_s = 1.35;

Schedular Task1;
Schedular Task2;

void setup() {
  Task1.start();
  Task2.start();
  Wire.begin();
  bme.begin(0x76);
  matrix.setIntensity(screenBrt); // 亮度 0-15

  // 设置显示屏旋转方向
  for (int i = 0; i <= 7; i++) matrix.setRotation(i, 1);
  /* matrix.setRotation(8, 1);
     matrix.setRotation(9, 1); */

  rtc.begin();
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // rtc.adjust(DateTime(2016, 02, 28, 16, 44, 0));
  // Serial.begin(9600);

  // eDOT 启动动画
  matrix.fillScreen(0);
  matrix.write();
  matrix.setCursor(12, 0);
  matrix.print("eDOT");
  for (screenBrt = 0; screenBrt <= 15; screenBrt++) {
    delay(25);
    matrix.setIntensity(screenBrt);
    matrix.write();
  }
  delay(250);
  for (screenBrt = 15; screenBrt >= 0; screenBrt--) {
    delay(50);
    matrix.setIntensity(screenBrt);
    matrix.write();
  }
  delay(500);
  matrix.fillScreen(0);
  matrix.write();
  delay(1000);
}

void loop() {
  Task1.check(acq1, 500);
  Task2.check(acq2, 20);
}

void acq1() {
  // 数据采集与平均
  temp = bme.readTemperature();
  avetemp.push(temp);
  tempavg = avetemp.mean();

  hum = bme.readHumidity();
  avehum.push(hum);
  humavg = avehum.mean();

  press = bme.readPressure();
  avepress.push(press);
  pressavg = avepress.mean();

  DateTime now = rtc.now();
  outSec = now.second();
  outMin = now.minute();
  outHour = now.hour();
  outday = now.day();
  outmonth = now.month();
  outyear = now.year() - 2000;
  dow = now.dayOfTheWeek();
}

void acq2() {
  lightsens = analogRead(A3);
  avelightsens.push(lightsens);
  lightsensavg = avelightsens.mean();
  screenBrt = constrain(((lightsensavg / 1023.0 * 15) * brt_s + brt_o), 0, 15);
  matrix.setIntensity(screenBrt);

  // 数据线性化
  temp_lin = tempavg * temp_s + temp_o;
  hum_lin = humavg * hum_s + hum_o;
  press_lin = pressavg * press_s + press_o;

  unsigned long currentLEDMillis = millis();
  if (currentLEDMillis - previousLEDMillis > LEDInterval) {
    previousLEDMillis = currentLEDMillis;
    screen++;
    if (screen > screenMax) screen = 0;
    screenChanged = true;
  }

  // if (screenChanged) { screenChanged = false; ... }
  switch (screen) {
    case TEMPERATURE:
      dtostrf(temp_lin, 4, 2, tempf);
      matrix.setCursor(6, 0);
      matrix.setTextSize(1);
      matrix.setTextColor(255);
      matrix.print(tempf);
      matrix.drawRect(37, 0, 2, 2, 255); // 度符号
      matrix.setCursor(40, 0);
      matrix.print("C");
      matrix.write();
      matrix.fillScreen(0);
      break;
    case HUMIDITY:
      dtostrf(hum_lin, 4, 2, humf);
      matrix.setCursor(6, 0);
      matrix.setTextSize(1);
      matrix.setTextColor(255);
      matrix.print(humf);
      matrix.setCursor(37, 0);
      matrix.print("%");
      matrix.write();
      matrix.fillScreen(0);
      break;
    case PRESSURE:
      dtostrf(press_lin, 6, 0, pressf);
      matrix.setCursor(0, 0);
      matrix.setTextSize(1);
      matrix.setTextColor(255);
      matrix.print(pressf);
      matrix.setCursor(37, 0);
      matrix.print("Pa");
      matrix.write();
      matrix.fillScreen(0);
      break;
    case TIME:
      matrix.setCursor(0, 0);
      matrix.setTextSize(1);
      matrix.setTextColor(255);
      if (outHour < 10) matrix.print("0");
      matrix.print(outHour);
      matrix.print(":");
      if (outMin < 10) matrix.print("0");
      matrix.print(outMin);
      matrix.print(":");
      if (outSec < 10) matrix.print("0");
      matrix.print(outSec);
      matrix.write();
      matrix.fillScreen(0);
      break;
    case DATE:
      matrix.setCursor(0, 0);
      matrix.setTextSize(1);
      matrix.setTextColor(255);
      if (outday < 10) matrix.print("0");
      matrix.print(outday);
      matrix.print("/");
      if (outmonth < 10) matrix.print("0");
      matrix.print(outmonth);
      matrix.print("/");
      matrix.print(outyear);
      matrix.write();
      matrix.fillScreen(0);
      break;
    case DAY:
      matrix.setCursor(15, 0);
      matrix.setTextSize(1);
      matrix.setTextColor(255);
      matrix.print(daysOfTheWeek[dow]);
      matrix.write();
      matrix.fillScreen(0);
      break;
  }
}