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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]

23 Sep 2008

I guess the most popular microcontrollers now a days in Bangladesh are ATmega8 and ATmega32. These microcontrollers have inverted reset, that does not work with the second circuit. So I am posting a circuit specially for these sort of noninverted IC. If your AVRs reset pin in datasheet have a bar on the name of it. ( Reset ) (or has a circle outsidethe pin of it), then this programmer is suitable for you. In the circuit diagram I have already shown the pin out of the BC 547 ic.

Simplification of the LancOs’s SI Prog – [Link]

5 Sep 2008

This is for those of you that want a quick prototyping system that will plug into a breadboard without taking up too much space. It will mount at a 90 degree angle to the breadboard like a video card on a computer motherboard.

  • AVR Studio Compatible
  • Atmel ATMEGA168 AVR
  • 16MHz Crystal
  • VCC, 5V, and 3V Power Supplies
  • ICSP, 1-wire Debug
  • ~$15 In Parts

QuickAVR part 1 – [Link]

Quick AVR part 2 – [Link]

Quick AVR part 3 – [Link]

30 Aug 2008

If you’ve ever bent the pin on a microcontroller while trying to insert it into a DIP programming socket, you’re not alone. Aligning those crazy pins again and again, while intermittently prying them out of the programming socket and then inserting your freshly burned chip into a target circuit, can lead to a long and sleepless night. Luckily, there is a cure for the bent pin nightmare. And this prescription costs less than $35.

A Rapid AVR Prototype Programmer – [Link]

13 Aug 2008

Nowadays, USB is the most popular connection connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, “use a USB to Serial adaptor to connect your AVR ISP with your PC”. Yes, that could be a solution but it would cost me more money than a singe FT232BM chip because I had to include an USB to RS232 adaptor and a power supply for my programmer.

USB AVR In-System-Programmer – [Link]





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