eDIY - Displaying items by tag: Electronics

Saturday, 15 February 2014 20:38

Wireless Router Remote Control Car

This is my first RC car control by an Arduino and a wirless router running OpenWRT. There are many OpenWRT supported routers, I'm using a TP-Link TL-MR3020 3G/4G Wireless N Router for this project since it is very slim, low power consumption and it is cheap.

RC car features

A webcam, the car can be driven without line of sight
A horn so that you can honk at people.
LED Headlights attached to the front of the car
Two wheel drive motor
Windows GUI application or web interface
Future Additions: Control by a smartphone (Android & IOS)

Published in Projects

Tuesday, 05 November 2013 20:36

Sharp GP2Y0A21红外线测距传感器

Sharp GP2Y0A21是一颗红外线测距传感器，易于使用，价钱廉宜，且低功耗。规格如下：

距离测量范围：10至80cm（4“到32”）
工作电压：4.5V至5.5V
输出类型：模拟电压
平均功耗：35mA
峰值功耗：约200mA
允许的最大角度：> 40°
更新频率/周期：25 Hz/40毫秒

Published in 电子与电脑

Sunday, 03 November 2013 17:49

Sharp GP2Y0A21 IR distance sensors

Sharp GP2Y0A21 is an infra-red distance measuring sensor unit, it is extremely effective, easy to use, very affordable and has low power consumption. specification as follow:

Distance measuring range: 10 to 80cm (4" to 32")
Operating voltage: 4.5V to 5.5V
Output type: Analog voltage
Average power consumption : 35 mA
Peak power consumption : about 200 mA
Output voltage differential over distance range: 1.9V
Maximum allowable Angle : > 40 °
The frequency of updates/cycle : 25 Hz/40 ms

Published in Blog

Tuesday, 22 October 2013 23:35

Programming Arduino with an AVRISP MKII programmer

Burning sketches to the Arduino board with an AVRISP MKII programmer without using the bootloader. This allows you to use the full program space (flash) of the chip on the Arduino board. So with an ATmega328, you will get 32KB instead of 30KB of space. It also avoids the bootloader delay when you power or reset your board.

Published in Tutorials

Tuesday, 15 October 2013 23:27

Arduino通过74HC595扩展IO

74HC595是一个价格廉宜的8位移位寄存器，通过3个数据引脚（STCP, SHCP, DS），可以控制几乎无限量的输出。

DS是一个串行数据输入端，每当时钟输入（SHCP）上升沿到来时，DS引脚当前电平值在移位寄存器中会移一位，连续进行8次同样的动作，就可以完成全部（Q0至Q7）移位。最后当STCP（Latch）上升沿到来时，移位寄存器的值将会被锁定在存储器里，并从Q0至Q7引脚输出。

Arduino UNO只有14+6个数字输出，如果需要更多的输出，其中之一的方法就是通过74HC595来取得更多的输出。

Published in 电子与电脑

Wednesday, 25 September 2013 18:40

Using 74HC595 Shift Registers with Arduino

The 74HC595 is a very handy IC used in many microcontroller projects, it is a 8-bit serial-in, serial/parallel-out shift register with output latches.

Data is shifted on the positive-going transitions of the shift register clock input (SHCP). The data in each register is transferred to the storage register on a positive-going transition of the storage register clock input (STCP).

The shift register has a serial input (DS) and a serial standard output (Q7S) for cascading. Data in the storage register appears at the output whenever the output enable input (OE) is LOW.

This is incredibly helpful if you need more digital outputs then the 14+6 that the ATmega328 on the Arduino Uno provides, with only 3 data pins, you can control an almost unlimited amount of outputs.

Upon completion of this tutorial, you should be able to controlling the 74HC595 as below:

Using 74HC595 Shift Registers with Arduino
Daisy chaining 74HC595 shift registers
Different ways (binary, decimal, hex) to hold the data using an array
Using bitshift, bitwrite operators
Direct port access for faster manipulation of the IO pins

Published in Blog

Saturday, 17 August 2013 16:51

Minimal Arduino with 8MHz internal clock

Build your own DIY Arduino board with only one passive component, it is very easy and simple. This is probably the most minimal ATmega328 based Arduino.

Part list

ATmega328
28 pins IC socket
10K resistor
Strip board

Published in Projects

Sunday, 04 August 2013 22:49

SalMonDuino: A simpletest ATMega328 Arduino

This is a tutorial shows you how to build your own Arduino, I name it as SalMonDuino which is derive from my name (SM Ching). SalMonDuino is an modified version of original post written by Serisman, features include: