Love FLORA but want a bite-sized version? Look no further, GEMMA is a tiny wearable platform board with a lot of might in a 1" diameter package. Powered by a Attiny85 and programmable with an Arduino IDE over USB, you'll be able to realize any wearable project!／喜歡 FLORA 但想要一口大小的版本？ 不要再觀望，GEMMA 是一款微型可穿戴平台板，在 1" 直徑的封裝中具有很多功能。由 Attiny85 提供支持並通過 USB 使用 Arduino IDE 進行編程，您將能夠實現任何可穿戴項目！

We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. Perfect for when you don't want to give up your Flora and you aren't willing to take apart the project you worked so hard to design. It's our lowest-cost sewable controller!

　　NEW In version 2! On March 4, 2015 we released Version 2, which is physically and code-wise identical but has changed the Mini-B connection for a Micro-B USB connector and adds a much-requested On-Off switch!／新版本 2！ 2015 年 3 月 4 日，我們發布了第 2 版，它在物理和代碼方面完全相同，但更改了 Mini-B 連接，用於 Micro-B USB 連接器，並添加了一個非常需要的開關！

The Attiny85 is a fun processor because despite being so small, it has 8K of flash, and 5 I/O pins, including analog inputs and PWM 'analog' outputs. We designed a USB bootloader so you can plug it into any computer and reprogram it over a USB port just like an Arduino (it uses 2 of the 5 I/O pins, leaving you with 3). In fact we even made some simple modifications to the Arduino IDE so that it works like a mini-Flora. Perfect for small & simple projects the GEMMA will be your go-to wearable electronics platform.／Attiny85 是一個有趣的處理器，因為儘管它很小，但它有 8K 閃存和 5 個 I/O 引腳，包括模擬輸入和 PWM“模擬”輸出。 我們設計了一個 USB 引導加載程序，因此您可以將它插入任何計算機並通過 USB 端口對其重新編程，就像 Arduino 一樣（它使用 5 個 I/O 引腳中的 2 個，剩下 3 個）。 事實上，我們甚至對 Arduino IDE 進行了一些簡單的修改，使其像迷你 Flora 一樣工作。 GEMMA 非常適合小型和簡單的項目，將成為您首選的可穿戴電子平台。

　　Even though you can program GEMMA using the Arduino IDE, it's not a fully 100% Arduino-compatible. There are some things you trade off for such a small and low cost microcontroller!／儘管您可以使用 Arduino IDE 對 GEMMA 進行編程，但它並非完全 100% 兼容 Arduino。 對於如此小巧且低成本的微控制器，您需要權衡一些東西！

• GEMMA does not have a Serial port connection for debugging so the serial port monitor will not be able to send/receive data／GEMMA 沒有用於調試的串口連接，因此串口監視器將無法發送/接收數據
• Some computers' USB v3 ports don't recognize the GEMMAs bootloader. Simply use a USB v2 port or a USB hub in between

Here are some useful specifications!

• Super small, only 1.1" / 28mm diameter and 0.28" / 7mm thick.
• Easy-to-sew or solder pads for embedding in your wearable project
• Low cost enough, you can use one for every weekend project
• ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM
• Internal oscillator runs at 8MHz
• Ultra low power, draws only 9 mA while running
• USB bootloader with a nice LED indicator looks just like a USBtinyISP so you can program it with the Arduino IDE (with a few simple config modifications)
• Micro-USB jack for power and/or USB uploading, you can put it in a box or tape it up and use any USB cable for when you want to reprogram.
• We really worked hard on the bootloader process to make it rugged and foolproof
• ~5.25K bytes available for use (2.75K taken for the bootloader)
• On-board 3.3V power regulator with 150mA output capability and ultra-low dropout. Up to 16V input, reverse-polarity protection, thermal and current-limit protection.
• Power with either USB or external output (such as a battery) - it'll automatically switch over／使用 USB 或外部輸出（例如電池）供電 - 它會自動切換
• On-board green power LED and red pin #1 LED
• Reset button for entering the bootloader or restarting the program.
• 3 GPIO - The 3 independent IO pins have 1 analog input and 2 PWM output as well.
• Hardware I2C capability for breakout & sensor interfacing.

Technical Details