ㄆㄜㄊㄧㄡㄙˋ: 11月 2014

2014年11月24日星期一

MPU6050 創意專題分享 - 多功能交通載具輔助系統

這是一份關於使用 MPU6050 所做的一個課堂上的專題報告，是利用 Arduino 取得 MPU6050 的六軸資料，利用互補濾波器去除加速度高頻雜訊與角速度的低頻影響，再經過運算得到腳踏車在轉彎時的角度數據。其中一軸的加速度用來控制煞車燈，另外運算所得的角度值作為腳踏車傾倒與方向燈的判別。

2014年11月17日星期一

使用 Arduino UNO / Duemilnova 燒錄 Arduino bootloader

網頁最後修改時間：2018/02/07

在網路上蒐一下 Arduino bootloader，可以找到下面這一段描述：

What is a Bootloader?

Atmel AVRs are great little ICs, but they can be a bit tricky to program. You need a special programmer and some fancy .hex files, and its not very beginner friendly. The Arduino has largely done away with these issues. They’ve put a .hex file on their AVR chips that allows you to program the board over the serial port, meaning all you need to program your Arduino is a USB cable.

The bootloader is basically a .hex file that runs when you turn on the board. It is very similar to the BIOS that runs on your PC. It does two things. First, it looks around to see if the computer is trying to program it. If it is, it grabs the program from the computer and uploads it into the ICs memory (in a specific location so as not to overwrite the bootloader). That is why when you try to upload code, the Arduino IDE resets the chip. This basically turns the IC off and back on again so the bootloader can start running again. If the computer isn’t trying to upload code, it tells the chip to run the code that’s already stored in memory. Once it locates and runs your program, the Arduino continuously loops through the program and does so as long as the board has power.