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31 May 2011

Andy from the UK was looking to build a simple proof of concept project which would integrate an Arduino and ENC28J60 based ethernet shield (or a Nanode) to connect with his Pachube account to control an RGB LED. [via]

He says:

This article describes a simple application to demonstrate the ENC28J60 EtherShield library. It can be run on a plain Arduino or clone and an ethernet shield based on the ENC28J60 ethernet chip (Note: This is not the same as the official ethernet shield). An alternative is to use the Nanode (see the wiki site at Hackspace) which combines the arduino and the EtherShield into a single compatible board. It also demonstrates the network capability of the board and the control functionality included in the Pachube dashboard application.

Pachube controlled RGB LED – [Link]

31 May 2011

Here’s an open source code project that allows you to program the Arduino core into physically smaller DIP chips, such as the Attiny84, Attiny85 or Attiny2313. [via]

Arduino-tiny: ATtiny core for Arduino – [Link]

31 May 2011

SQKYbeaver posted a linear bench power supply in the project log forum. [via]

i have been working on a linear bench power supply, and have come to the conclusion that the cost of parts will be more than what i cam buy an assembled one for, however i will share what i have come up with so far so that any one interested will be able use what i have started.

DIY bench power supply – [Link]

31 May 2011

Arduino UNO + Google’s ADK tutorial @ – BricoGeek.com – [via]

[few days ago] ADK was presented on Google’s blog, a platform that enables communication between Android and Arduino. The downside was that the development kit costs around 300 €.
Today we bring you a scoop. After seeing different people online who managed to run the ADK on Arduino with a USB Host Shield controlling a servo or LED, we intend to play all the devices included in the kit but in our BricoGeek DIY version, with the products we have available in the store.

Arduino UNO + Google’s ADK tutorial – [Link]

31 May 2011

Fabien wrote a great tutorial on using the Adafruit TFT display with a Netduino. He writes: [via]

AdaFruit recently released a sweet little TFT display that I was dying to hook up to a netduino: the display features a resolution of 128*160 pixels, is capable of showing 18-bit colors and has a microSD card reader on the back of the breakout board. As usual, Limor wrote a nicely detailed Arduino tutorial showing how to connect the display and how to write sketches to drive it.

The Arduino driver relies on the ability of the Atmega168/368 to toggle digital lines extremely fast, which does not work well on the netduino due to the latency introduced by the .Net Micro Framework: even when configured to use hardware SPI, the Arduino driver constantly toggles a data/command output line, rspin below, which would be unbearably slow on the netduino if the same method were applied.

The netduino has one advantage over the Arduino: it has plenty of RAM. So, instead of toggling I/O lines slowly all the time and using next to zero RAM, the netduino driver allocates a 40K buffer corresponding to the resolution of the display in 12-bit depth colors (16 bits per pixel) and leaves the ST7735 in ‘data’ mode upon initialization.

Drawing always happens on the internal buffer first. Then, whenever the actual display needs refreshing, the display I/O operations are performed using hardware SPI, blasting the entire 40K buffer. It may sound crazy but using this method on the netduino is faster than refreshing a single pixel while toggling an I/O line!

Driving an Adafruit TFT Display with a Netduino – [Link]

30 May 2011

voltsandbytes.com writes:

I make a lot of breakout boards that I usually use in my hobby projects. Most are input/output devices but some are microcontroller breakout boards.

Breakout Board Collection – [Link]

30 May 2011

voltsandbytes.com writes:

This microcontroller project is another version of a persistence of vision or POV toy. It has 8 LEDs and it is powered by ATtiny2313 (AVR microcontroller by Atmel) operating at 2 x AA batteries. This is a tiny toy and it can be carried easily inside your pockets.

tinyPOV – Yet Another AVR POV Project – [Link]

30 May 2011

voltsandbytes.com writes:

The LPC1343 is a low power ARM Cortex M3 microcontroller targeted for embedded applications. It has 32KB of flash memory and 8KB of SRAM. On-chip peripherals include I2c, SPI, UART, Timers, Interrupts, ADC, USB, etc. It includes both UART and USB bootloader. Believe me, the USB bootloader is cool.

LPC1343 Breakout Board – [Link]

30 May 2011

voltsandbytes.com writes:

Humidity sensors measure the relative humidity of air. They come in different types – both digital and analog types. The digital types are relatively more expensive than the analog types. The measured relative humidity by digital humidity sensors are commonly sent out using digital serial interfaces like I2C and SPI. Analog humidity sensors are cheaper and they come in two types – capacitive and resistive humidity sensors.

Using Analog Humidity Sensors – [Link]

29 May 2011

www.microsyl.com writes:

I had done a project where the AVR is powered via the main 110Vac line, So I had to find a solution to be able to test my code in real life, I had look to many thing and found very cool opto-isolator, “you must check the datasheet IL717″

AVR ISP Galvanic Isolation – [Link]





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