AntzyP @ instructables.com writes:
What’s with mint boxes and electronics? Beats me, but they are somehow made for each other. I had built ladyada’s USBtinyISP v1.0 circuit on a breadboard which I used every other day. It worked sporadically(and never at hour of need), used up half of my breadboard and looked ugly. So I decided to try my hand at home PCB fabrication and build it in, of course, a tiny tic-tac box. Since I was a beginner, the circuit is easy and single-sided and uses crystal instead of ceramic oscillator.
Tic-Tac USBtinyISP Programmer - [Link]
JeonLab @ instructables.com writes:
For relatively small (less number of pins than ATmega328) projects, ATtiny series, ATtiny45 or Attiny85 are good choice in terms of its physical size (8-DIP or 8-SOIC) and low power consumption. There are many ways to program it. One of the popular device is USBtinyISP and DASA. Both of them work very well with WinAVR (AVRdude).
ATtiny programmer using Arduino ISP - [Link]
Pedantite built his own Little Wire AVR programmer/tool:
The Attiny 85 has a neat feature that I had overlooked until I built this in that it has a built in PLL that lets you run the system off the internal RC oscillator at around 16Mhz. Many other AVR’s lack that PLL, and can only run at 8Mhz maximum without an external crystal.
Little Wire AVR-ISP - [Link]
USBTiny-MkII SLIM programmer (AVRISP-MKII clone) supports all Attiny, Atmega, and Xmega µcontrollers. It has three programming interfaces: ISP, PDI, and TPI. It works with AvrStudio or AvrDude. Small convenient board, contains double direction voltage translator for all interfaces and working from 1,2V, jumper for target chip voltage selection 5V or 3,3V (LDO stabilizer), and status LEDs. The heart of the device is a AT90USB162 controller with hardware USB, so it can provide fast programming speeds.
USBTiny-MkII SLIM programmer - [Link]
LadyAda some time ago build a low-cost AVR ISP. In μC.net there was a further development of the project under the name “AVR ISP Stick” or “People’s Programmer” I take up the project and develop it further with the permission of Ada.
AVR ISP Stick - [Link]
We use an Arduino to program other ATmega without bootloader . This technique allows you to use all flash memory for code and make boards using new ATmega, cheaper than those with bootloader.
The qualities that have made the success of Arduino are undoubtedly the open-source software, many libraries, a good hardware and a virtually infinite Reference that explains each possible use of the platform.
But if we use Arduino for a specific use, we can integrate it into a specific circuit and program the micro in a way that performs a single firmware. We may so remove the bootloader and leave to the firmware the entire program memory.
The ATmega328 has 32 Kbytes of flash, that when the chip is mounted on Arduino are not all available, as a portion is reserved to the bootloader, the purpose of which is to communicate with the IDE Arduino to load programs (sketch) to be performed. The same bootloader, on each power on or reset of Arduino, verifies the presence of a sketch in flash memory and executes it. The bootloader occupies a space of 512 bytes, in the case of Arduino UNO.
Arduino ISP and stand-alone circuits - [Link]
This is a very basic Atmega328 development kit It includes:
- Atmega 328 8 bit microcontroller with 20 MHz crystal resonator
- PCB board with place for external components
- Power circuit that allows powering Atmega directly(2.7-5.5 V), or through a L7805 voltage regulator(8-35 V). L7805 circuit includes a thermal fuse.
- 10 pin ISP connection for programming.
Atmega328 Development Kit Guide - [Link]
Since this is a well working low budget AVR ISP progammer (by Thomas Fischl), I offer a compact single-sided THT-SMD combined layout. The circuit is identical to the official programmer, so the original firmware can be used with this board. This programmer is supported by avrdude. One of the main features is that the low speed USB protocol stack is realized directly with the used AVR controller, which makes this programmer a low budget one, about 5EUR material costs. Notice however that this programmer cannot be used with 3V3 systems without an additional level shifter.
Alternative board for USBasp AVR ISP programmer - [Link]
Picked up one of these IC test clips on eBay for a few quid.
The idea is that you clip it to a chip on a circuit board so you have easy access to the connections for use with test probes.
I’ve got a different use for it though. If you develop a circuit using an Atmega chip (like, say, a circuit you developed with an Arduino but have now moved to a custom board), reprogramming the chip is fiddly. The best way to make your circuit easily re-programmable is to build an ISP header onto your board – it’s just a 6-pin connector that lets you blast new programming onto the chip without removing it from the circuit.
DIY Atmega programming clip - [Link]