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13 Jan 2010

Back in July 2009, we reviewed Protostack’s ATMEGA8 development kit. The heart of the kit was Protostack’s 28 pin AVR board. This week Protostack released a new version of that board and it includes a whole bunch of improvements. You can read the original review here.

This release is the 3rd one to date and includes the following improvements over the one we previously looked at.

  • Addition of power supply block
  • ISP-6 interface is now 2×3 pin instead of 1×6 pin
  • Addition of a section for double row headers and IDC connectors
  • Clearer labeling of power busses

The board is available on its own or as part of an ATMega8 or ATMega168 development kit from www.protostack.com. Pricing starts at $9.60 for a single board.

30 Nov 2009

Display on QVGA 240×320 pixel using AVR small 8 bit microcontroller

Build photo frame with AVR and BL-TFT240320PLUS - [Link]

10 Nov 2009

Peter, from Rossum’s Posterous writes:

Can you make an iPhone out of an AVR? No. Can you get a surprising amount of functionality out of a humble 8 bit processor and a cheap touch LCD? Yes. The iPhone runs more than 30 times faster (417Mhz ARM vs 12Mhz AVR) and has more than 30,000 times as much ram RAM (128M vs 4k) yet this frumpy little device can ape some of the iPhones neater tricks. [via]

8-bit AVR homebrew touch-sensitive handheld – [Link]

4 Nov 2008

This basic hack shows how to burn the bootloader onto the Atmel chips that the Arduino controller uses without the need for an external AVR Writer. Simple soldering skills required, but if you are using an Arduino, you are probably already a soldering pro. [via]

Burning the Bootloader without external AVR-Writer - [Link]

23 Oct 2008

synth-diy.blogspot.com writes:

I decided to make JAREK ZIEMBICKI’s AVRSYN. But there were only the schematics and no board layout so I had to make my own. So I started laying it out on eagle but I got on a deadlock due to the fact that I didn’t want to make a double sided board. I would etch it myself and double sided boards are a BIG pain in the but (vias and such, alignment etc). So I made it on a perfboard. But before that, I decided that it should be made into discrete modules. One for the microchip, one for the D2A (an R2R resistor ladder type) , one for the midi interface, one for the power supply and one for the switch multiplexer.

AVR Synth Part 1 – [Link] – Part 2 – [Link- Part 3 – [Link- Part 4 – [Link]  - Part 5 – [Link]

10 Oct 2008

How to connect a Nokia LCD to a AVR-Controller. he Display (which is used in Nokia 6100, 7210, 6610, 7250 and 6220) has a resolution of 132×132 pixel @4096 Colors. The visible area is about 3cm x 3cm in size. It can be found cheap at *bay.

Controlling a Nokia 6100 Display with an Atmel-AVR – [Link]

8 Oct 2008

Rob writes that he’s created a custom Arduino AVR library for EAGLE that lets you easily integrate Atmel’s ATMEGA168 and ATMEGA8 microcontrollers into your designs. You can download this library from the link below. [via]

Arduino AVR library for EAGLE - [Link]

4 Oct 2008

This project makes firmware upgrades easy: The target has an Infrared receiver and the data is sent via IR. The IR transmitter is based on AVR-USB.The host-side consist of host-program for Win32 PC using Libusb-Win32, device based on ATmega8 using firmware-only USB driver by Objective Development and infrared hardware unit.Host program was compiled using Lazarus Freepascal. Device firmware was compiled using WinAVR (AVR-GCC).The implementation uses custom device class, required simple inf file and libusb driver on PC. [via]

Atmel AVR Infrared Downloader - [Link]

29 Sep 2008

This device monitors household power usage and logs it to an SD card. A simple analog front-end amplifies the signals from voltage and current detectors and an ATmega168 microcontroller computes the power consumption using the formula P=V*I. The voltage and current are each sampled at 9615 Hz so the integration should be fairly accurate even for highly non-sinusoidal loads such as computers or fluorescent bulbs. A graphical LCD shows the power usage as a strip chart and can also act as an oscilloscope to display the voltage and current waveforms. The current is amplified in three stages (1x, 10x, and 100x) so that different gains can be used giving accurate readings for both high and low power usage. [via]

An AVR-based power usage logger - [Link]

25 Sep 2008

MightyOhm writes:

As I mentioned earlier this week, I recently “lost” an ATmega168 due to flashing the configuration fuses to disable the RESET pin, without realizing that this makes the device impossible to reflash with SPI. This is particularly frustrating because the device is still 100% functional, just completely deaf to ordinary serial programmers. The only way to recover the device is using what Atmel calls “High Voltage Parallel Programming Mode” which very few programmers support, most importantly, not the USBtinyISP I otherwise love.

Fortunately, my trusty Arduino came to the rescue – I created an Arduino-based AVR programmer that uses the high voltage programming mode and can fix pesky fuses like RSTDISBL.

The Arduino has just enough IO to implement the entire HV protocol plus a “go” button. So far I have only implemented setting LFUSE and HFUSE in software, but there is no reason why the code couldn’t be extended to support chip erase and programming the entire flash as well.


Arduino-based AVR High Voltage Programmer - [Link]





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