Bad quality shield bought on eBay

Category : Arduino, Electronics

I was looking for some cheap shields for my Arduino board, and stumbled across a very inexpensive proto shield. A well known seller with good reputation had it laying around for only 7,65 $, so it couldn’t be that bad.

Well, after a couple of weeks it arrived in the mail. And here are a few things I noticed:


Looks like it’s rusted and kind of old?


Not even close to nice solderings…


Some plastic is melted off? šŸ˜›

Well, its not worth that much and it actually works, but for how long?

Whats most annoying is how the seller can say that its Quality and New!

 

DHT11 Library for Arduino 1.0

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Category : Arduino, Electronics

DHT11 is a cheap and easy to use temperature and humidity sensor. But since it’s digital and only uses one pin there is a great library for it!

Of course it has some problems compiling on Arduino 1.0 and the one I found on the arduino.cc playground had problems. So I modified it, and put both the library and the example in a nice and easy to unzip package. The example sends data on serial back to the pc, so it looks like this when posting results:

Credit goes to the arduino playground for the library and example code.

Download Arduino DHT11 Sensor Library

NetDuino a rather interesting board

Category : Electronics

I just came over this Arduino clone if I may say, it’s called NetDuino It looks almost the same as the Duemilanove board. Anyhow, you program it in Visual Studio C# Express using the .NET Micro Framework.

Netduino is an open source electronics platform using the .NET Micro Framework.
Featuring a 32-bit microcontroller and a rich development environment.
Suitable for engineers and hobbyists alike.

Netduino is an open source electronics platform using the .NET Micro Framework.
Featuring a 32-bit microcontroller and a rich development environment.
Suitable for engineers and hobbyists alike.

Specifications are:

Atmel 32-bit microcontroller
Speed: 48MHz, ARM7
Code Storage: 128 KB
RAM: 60 KB

all 20 digital and analog pins: GPIO
digital pins 0-1: UART 1 RX, TX
digital pins 2-3: UART 2 RX, TX
digital pins 5-6: PWM, PWM
digital pins 7-8: UART 2 RTS, CTS
digital pins 9-10: PWM, PWM
digital pins 11-13: SPI MOSI, MISO, SPCK
analog pins 4-5: I2C SDA, SCL

And for only 34,95 USD it’s very interesting šŸ™‚