ATtiny88 or 828 on a simple breakout board. Arduino compatible.Designed by Azzy's Electronics, Ships from United States of America
This is a simple development board for the Atmel ATtiny88 and ATTiny828. It provides an ISP header for programming via ISP as well as decoupling capacitors, a voltage regulator, and a PTC fuse prot...Read More…
This is a simple development board for the Atmel ATtiny88 and ATTiny828. It provides an ISP header for programming via ISP as well as decoupling capacitors, a voltage regulator, and a PTC fuse protecting the external power supply from a short. For the ATtiny828, bootloader support is provided, and it can be programmed over serial via the 6-pin FTDI header; a jumper can be used to enable or disable auto reset. It can be used as a standalone board with female dupont jumpers or header, and the pins pointing up, or with breadboard (using two breadboards next to each other, as the board is too wide for a single piece of breadboard), by mounting the pins pointing down. For ease of connection without breadboard, five Vcc and Gnd pins are provided, instead of just one. These parts no not support an external crystal.
Using the ATTinyCore Universal core available from my Github at https://github.com/SpenceKonde/ATTinyCore, the ATtiny88 and 828 can be used with the Arduino IDE. The ATtiny828 supports Optiboot, which is supplied pre-loaded, allowing it to be programmed with a serial adapter (like an Arduino Pro Mini); both the ATtiny88 and ATtiny828 can be programmed with any ISP programmer (USBAsp recommended).
There are two versions of this board available - the new Rev. B version (2" x 1.65" outline) and the old version (2" x 2" outline). The old version board uses a single layout that supports the 88, 828, or an atmega328p; this made for a confusing layout, and the new versions only apply to a single family of microcontrollers - this also allowed for the board outline to be shrunk.
This board is sold ASSEMBLED, but without pins (as shown), with fuses set for 8mhz operation and - in the case of the Tiny828 - pre-loaded with the Optiboot bootloader.
The ATtiny88 is a pared-down version of the popular ATmega x8 line, and as such is has a great many similarities with those popular ATmega product lines, including the fully functional on-chip SPI and I2C (while most ATtinies have either a USI, or slave-only I2C). The biggest claim to fame of the ATtiny88 is that it is very cheap in quantity, making these boards well suited to prototyping of cost-sensitive designs.
The ATtiny828 has more advanced features than the ATtiny88, with the all important hardware serial port, as well as 28 different single-ended ADC channels (one on every pin!). Because of the hardware serial and hardware bootloader support, it is fully compatible with Optiboot, which fits into 512 bytes of flash on this chip, minimizing space consumed for the bootloader. All ATtiny828 boards ship with Optiboot preloaded.
Note that the internal oscillator on the 828 runs significantly faster at voltages higher than 4v, enough so that UART communication will not work without recalibrating the internal oscillator. The bootloader supplied with 5v boards compensates for this for the purposes of code upload, but this may still need to be addressed in user code. Be sure to use an appropriate voltage serial adapter for programming.
A CH340G-based serial adapter is available as an option. This will be supplied with a 6-pin cable as shown, and the voltage of the adapter will match the voltage of the board (3.3V or 5V only). These are mass-production, no-frills commercial adapters. They break out the pins necessary for programming one of these breakout boards, or an Arduino Pro Mini or similar - Vcc, Gnd, TX, RX, DTR and CTS.
Note that the ATtiny88 does not have hardware serial support, and no bootloader for that is supplied - it must be programmed using an ISP programmer.
For a fancier CH340G adapter which breaks out all pins, check out my own CH340G-based design.
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I build projects with Arduino (ATtinies almost exclusively, never anything bigger than a '328p) and Espruino (often both working together), and I make a lot of circuit boards for these projects. Particularly after using my ATtiny-prototyping board for my own projects, I realized that these would be useful to other people, and decided to start selling them here on Tindie.
Strip Board, Protoboard, prototyping board, solderable breadboard - whatever you want to call it - it has been a mainstay in electronics prototyping for decades, and hasn't changed much in the interim (not even in production quality, as they're still often single-sided and/or manufactured from low-grade phenolic resin instead of FR4). My prototyping board creations bring these into the modern era, offering a combination of 0.1" through-hole prototyping areas (consisting of groups of 2, 3 or 4 pins connected together, like solderable breadboard) and pads for common surface mount packages connected to through-holes for easy soldering. To handle projects of all sizes, I offer prototyping board as large as 4" x 4", down to less than an inch square in my Mini Protoboard line. Unlike most commercial prototyping board, these boards are made to the same quality standards as real PCBs. Through-holes are plated, and the boards are double sided. These are offered in both generic versions, and ones tailored to specific microcontrollers, like the Tiny84/85, or microcontroller boards, like the Espruino Pico, Arduino Pro Mini, and the wildly popular ESP8266.
ATtiny breakout boards:
I love the ATtiny lineup, particularly some of the less popular ones, like the incredibly full-featured ATtiny841, ATtiny1634, and ATtiny828. Breakout boards for these that had the features I wanted were not readily available - so I made my own. I've since expanded my product line to include breakout boards for the ATtiny861, ATtiny167, and ATtiny88 - and all of these are available both as bare boards and assembled. In addition to designing the hardware I also maintain [ATtinyCore Universal](https://github.com/SpenceKonde/ATTinyCore), which enables Arduino support for all these ATtiny's and more.
I also sell a number of other boards to fill what I felt were gaps in the market, including a breakout board for the popular LoRa/LoRaWAN modules from Microchip (the RN2483 and 2903), which has become one of my top selling items. I also sell MOSFET drivers and breakout boards for logic level MOSFETs operating at logic levels of 2.5v and lower - while a great number of MOSFETs are available that operate with very low gate voltages, these are almost invariably SMD parts which are difficult to use without a properly designed breakout board.