ATTiny88 breakout boards, Arduino compatible, with bootloader.

We are out of stock on bare 828 boards, and I am unsure if demand warrants another round of production

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. Both of these boards now support the Optiboot bootloader - the ATtiny828 uses the hardware serial port, while the ATtiny88 uses software serial, allowing them 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).

The boards offered for sale for the Tiny88 are the Rev. D boards with no known defects other than the silkscreen being less artfully arranged than in my later designs.

All boards are sold pre-bootloaded with Optiboot. If you want to upload via ISP without using the bootloader, with ATtiny88 boards, you can just upload via ISP. For ATtiny828, you should do Burn Bootloader with the "no bootloader" option selected first.

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.

Bare Board available here

ATtiny88

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. Although it does not have a hardware serial port, software serial works - that's what the version of Optiboot used on these uses.

Features

• 8k Flash, 64b EEPROM, 512k SRAM
• 28 GPIO pins (27 excluding reset)
• Hardware SPI Master/Slave (works with normal SPI library)
• Hardware I2C Master/Slave (works with normal Wire library)
• Two PWM outputs (both on timer1, a 16-bit timer).
• 8 analog inputs
• PCINT on every pin
• on-chip analog comparator
• 8mhz (internal), up to 12mhz (external clock).
• Cheaper than the ATtiny85 or ATtiny84 in quantity.
• Assembled in the USA.

Pin header required (we do not install pin header - either we would have to charge significantly more for shipping, or the pins get mangled in transport. The following would be appropriate (not included unlesss you get the addon pin options):

• 1 piece 2x3 0.1" pin header, SMD or Through-hole (for ISP programming)
• 2 piece 1x19 0.1" pin header
• 1 external power connector on 0.1" centers (optional)
• 1 piece 1x6 0.1" pin header, recommend 90 deg angled (FTDI header - option if using neither serial nor bootloader)
• 1 piece 1x2 0.1" pin header (for jumper to enable reset; optional

Optional Serial Adapter

We are currently out of serial adapters, and I've straight up lost patience with the ones on the market! ~we will be assembling a BUNCH of my new and improved ones, with even more advanced ones coming by year end~ The new batch had problems discovered only after assembling a ton of em, and three more advanced designs recently failed testing in their initial revision.