“I lost one in the carpet and I’m hoping to find it before the vacuum does.”
The super small ATtiny10 is a high-performance, low-power 8-bit MCU that combines 1KB of Flash memory, 32B SRAM, four general purpose I/O lines, 16 general purpose working registers, a 16-bit timer/counter with two PWM channels, internal and external interrupts, a programmable watchdog timer with internal oscillator, an internal calibrated oscillator, a four-channel A/D converter, and four software selectable power saving modes. The device operates between 1.8-5.5V.
But what really makes this chip stand out is its minuscule size. Because of this, the ATtiny10 doesn’t use the normal in-system programming port like its much larger siblings. Instead, this particular AVR employs a Tiny Programming Interface (TPI), which only requires power, ground, data, clock and a reset pin. Connecting these pins to the proper programming header is fairly straightforward, and with the right layout, you can cram everything into a breakout board that’s tinier than a typical 8-pin DIP.
Well, this is exactly what Dan Watson has done. The Maker has created a mini breakout board for the ATtiny10 that’s so small, you’ll lose it. “Literally,” he adds, “I lost one in the carpet and I’m hoping to find it before the vacuum does.”
The PCB itself is 0.25” x 0.325″ and uses 0.050″ header pins. The breakout could actually be made smaller, but turns out, Watson ran into the minimum PCB size limit on OSHPark. Despite its form factor, he was able to include a 100nF bypass capacitor, a power LED and a user LED on pin PB1 — that pin is also the clock pin for the programming interface, so it flashes when the board is being programmed.
Admittedly the board was a bit difficult to use and program, and is “certainly not breadboard compatible due to the small pitch headers.” To overcome this issue, Watson built a small landing pad for it, which adapts the 0.050″ headers to 0.1” headers. The landing pad has a 6-pin TPI programming connector, which enables the ATtiny10 to be configured using the Atmel-ICE development tool.
In any case, Watson is now the proud owner of a shrunken-down board that can fit pretty much anywhere. And since you can do plenty of things with 1KB, it’ll be interesting to see what the Maker comes up with. Some possible ideas include designing a pint-sized drone, building a swarm of cybernetic bats, showing off your fine soldering skills to friends, making digital fireflies, or simply incorporating it into a project’s PCB by adding 0.050” male headers to the board. Intrigued? Head over to the project’s page here.