Assembled ATtiny412, new megaAVR ATtiny, 5 I/O pins, DAC, Arduino supportDesigned by Azzy's Electronics in United States of America
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Convenient, minimalist development/breakout board for new ATtiny412 (or 402) Over the past several years, Atmel/Microchip has been releasing parts based on their new "megaavr" architecture. These u...Read More…
Over the past several years, Atmel/Microchip has been releasing parts based on their new "megaavr" architecture. These use the familiar AVR instruction set and open source avr-gcc compiler used with the classic AVR microcontrollers, but with redesigned and more capable on-chip peripherals and highly competitive prices. The best known of these (among hobbyists, at least) is the ATmega4809, used on the Arduino Uno WiFi Rev.2 and Nano Every. However, there is also an extensive line of ATtiny parts based on this new architecture - and now with my megaTinyCore, there is full Arduino IDE support for these.
The ATtiny 412 and 402 are the top-end 8-pin parts from the megaavr ATtiny product lines - unfortunately they don't seem to have 8Kb parts available, at least not yet. These breakout boards come equipped with your choice of 3.3v or 5v regulator (ZLDO1117 or LDL1117 depending on stock) so that it can be supplied with an external supply (minimum 1.3v higher than operating voltage) using the two pins in the lower left corner, an LED (on PA7, Arduino pin 3), and a UPDI programming header (with the 4.7k resistor on the board). There is a 1x6 pin "FTDI"-style serial header on the bottom edge of the board (no auto reset, as there is no separate reset pin). Assembled boards are available with either the ATtiny412 or ATtiny402 mounted.
All pins are broken out, and there are 3 Vcc and 3 Gnd pins available, plus the ones on the Vcc and Gnd headers, so even if you're not using breadboard, you can still easily connect power and ground for multiple external devices.
Board dimensions are 1.1" x 0.85"
The ATtiny402 is the top-end 0-series part in the 8-pin package. The 0-series is intended for low cost applications, and cuts a few features. These are offered as an option for people developing boards that will be produced in large quantities where the cost savings is significant. For hobbyists and one-off projects, the 402 is almost certainly a better deal. The main differences are:
In some of the pictures shown above, the boards are shown with pin header (not included) attached. We recommend:
Unlike other AVR microcontrollers, these new parts are programmed via a "UPDI" singlewire interface instead of the SPI-based ICSP protocol. You can easily use a standard Arduino Nano, Uno, or Pro Mini as a UPDI programmer, this is what we use and recommend - see the instructions here:
The order of the pins on the UPDI header is UPDI-Gnd-Vcc - this means that if the programmer is connected backwards, the board will not be damaged. The 4.7k resistor is on the breakout board; you do not need to (and should not) use another one.
A typical development configuration might have the board connected to a serial port via the 6-pin serial header for serial debug, and to the UPDI programmer via the 3-pin header for uploading new code (as shown in the pictures)
If there is interest, I can offer pre-wired UPDI programmers made from commercial Nanos - let me know if this is something you would be interested in buying.
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