Lesson 1--Microduino "LED and a Breadboard"

Objective Using Microduino to control a LED. Actually you can learn to how to use the Micrduino's I/O port. This is a basic skill you should master and for further study. Equipment Microduino-Core Microduino-Core is a 8-bit microcontroller development board based on Atmel ATmega328P, ATmega168PA series, and is an open source, compatible with Arduino UNO controller module. Detailed information, please refer to http://wiki.microduino.net/index.php?title=Microduino-Core Microduino-FT232R Download program module, connect with Microduino-Core or Microduino-Core+ directly and communicate with PC. It uses MicUSB as the download port. And it has the same size with a dollar coin. Download line with most smart phones usb data cable is the same, convenient and practical Detailed information, please refer to http://wiki.microduino.net/index.php?title=Microduino-FT232R Other hardware equipment Breadboard Jumper one box Breadboard one piece LED Light-emitting diodes one 220ohm resistor one USB Data cable one Breadboard In the vertical direction，5 points connected together and 25 points connected together in a horizontal direction. Some bread has 50 points connected together, so make sure connection format before you use it, in order to avoid generating erroneous results. The next two rows of points 50 have more usage, one row as GDN, the other row as VCC. Please refer to the following picture. Resistor and LED Limiting resistor is used to prevent LED burned. Usually red and green LED voltage is 1.8 ~ 2.4V, blue and white is 2.8 ~ 4.2V, 3mmLED rated current is 1 ~ 10mA, 5mmLED rated current is 5 ~ 25mA, and 10mmLED rated current is 25 ~ 100mA. According to R = U / I to the calculated resistance. Usually hundreds of ohm should be ok. Experimental schematic There are two connection methods, one is that led cathode connects to GND, anode connects to Microduino digital I/O port 13, which is the high light led. The other method ist that led cathode connected Microduino digital I/O port 13, anode connects to VCC, so that low-level light led. Program 采用delay()函数： int led = 13;//定义引脚 void setup() { pinMode(led, OUTPUT); //定义microduino数字13脚为输出 } void loop() { digitalWrite(led, HIGH); //数据13口输出高，若接法是高电平点亮则点亮，反之则熄灭 delay(1000); // 延时1s digitalWrite(led, LOW); //数据13口输出低，若接法是高电平点亮则熄灭，反之则点亮 delay(1000); // 延时1s } 采用milles()：返回自Microduino板开始运行当前程序的毫秒数 int ledPin=13; #define TIME 1000 long time1=0,time2=0; void setup() { pinMode(ledPin,OUTPUT); } void loop() { if(millis()<time2+TIME) { digitalWrite(ledPin,HIGH); time1=millis(); } else { digitalWrite(ledPin,LOW); if(millis()>time1+TIME) time2=millis(); } } 采用millis()比delay()函数效果更好，占用资源少，对系统拖延较少。 程序下载方法 选择控制板型号，本次实验使用的是Microduino-Core(ATmega328P@16M，5V)。在工具下的板卡中进行选择。328有两种，如何判断自己的板卡是哪种，可通过0电阻的接法来判断。 选择COM端口，每个人电脑上匹配的串口都不一样，选好就可以。COM端口可在电脑属性中的设备管理器里面有个COM端口，也可以双击通过端口设置的高级来改变COM端口。 编译下载 结果 程序下载后，可看到led每隔1s闪烁一次。 视频