Original Arduino Micro without Headers - A000093
🤖🌟 Arduino A000093 - Micro without headers
Original Arduino Micro Development Board (No Headers) — a compact, breadboard-friendly microcontroller board based on the renowned ATmega32U4 MCU. It’s ideal for embedded electronics, compact prototypes, and USB-enabled interactive projects.
📊 INFOGRAPHIC OVERVIEW — Arduino Micro without Headers (A000093)
Arduino Micro (A000093) | 🧠 Microcontroller | ATmega32U4 8-bit AVR | | ⚡ Clock Speed | 16 MHz | | 💾 Flash Memory | 32 KB (4 KB used by bootloader) | | 🧠 SRAM | 2.5 KB | | 📦 EEPROM | 1 KB | | 📡 USB Support | Native USB (HID + Serial) | | 🔢 I/O Pins | 20 (7 PWM, 12 Analog) | | 🔌 Operating Voltage | 5 V | | 🔋 Power | USB or 7–12 V via Vin | | 📏 Dimensions | 48 × 18 mm | | 📦 Headers | Not Pre-Soldered(DIY)
🧠 1️⃣ Core Heart — ATmega32U4 MCU
The board uses the ATmega32U4 microcontroller from the AVR family — the same chip used in Arduino Micro — but in a headerless form so you can directly solder custom connectors or wires to it for built-in projects.
Key Features
✔ Native USB support — no USB-to-serial chip needed
✔ Appears as mouse, keyboard, joystick, or MIDI device
✔ Ideal for HID projects or compact embedded builds🧩 2️⃣ Size & Form Factor
| Feature | Specification |
|---|---|
| Board Size | 48 × 18 mm |
| Weight | ~13 g |
| Header Style | No headers pre-soldered (DIY choose header type) |
| Breadboard-Friendly | ✔ Yes |
Small footprint makes it great for compact devices and breadboard layouts without bulky connectors.
🔌 3️⃣ Connectivity & I/O
✔ 20 Digital I/O Pins — lots of flexibility
✔ 7 PWM Outputs — for motor and LED control
✔ 12 Analog Inputs — sensors & analog reads
✔ UART, SPI, I²C — communication protocols
✔ Micro-USB port — for power and programming
Because it’s header-less, you can solder the exact type of pins, wires, or connectors you need for a custom embedded design.
💡 4️⃣ Power Options
✔ Powered directly from USB
✔ Powered from external 7–12 V (via Vin pin)
✔ Operating logic voltage: 5 V
The recommended input voltage is 7–12 V — going above this might overheat the regulator.
🧠 5️⃣ Built-in USB Capabilities
One big advantage of this board (shared with other “Micro” boards) is native USB support:
✔ Acts as a keyboard
✔ Acts as a mouse
✔ Acts as a game controller
✔ Acts as a serial COM port to the host computer
This makes it great for interactive devices and HID projects without extra USB adapter chips.
🛠️ 6️⃣ Why Choose the Headerless Version?
✔ Customize pin connectors for your project
✔ Low profile in embedded designs
✔ Solder right into PCBs or custom boards
✔ Ideal for robotics, wearables, and compact IoT devices
Many makers prefer to solder right-angle headers, female sockets, or wire leads depending on their project’s mechanical design.
🧠 7️⃣ Programming & Ecosystem
✔ Works with Arduino IDE
✔ Can be programmed via USB directly
✔ Uses the Arduino Micro board profile in IDE
✔ Compatible with most Arduino libraries for I/O, HID, and communication
Because it’s an official Arduino product, it enjoys full ecosystem support, tutorials, and community libraries.
📌 8️⃣ Ideal Use Cases
✅ Custom embedded controllers
✅ Compact robotics brains
✅ USB HID devices (keyboard, mouse, gamepad)
✅ Wearables & sensor nodes
✅ Breadboard rapid prototyping
✅ Space-constrained IoT modules
🆚 9️⃣ Micro vs Headered Version
| Feature | Micro (No Headers) | Micro (With Headers) |
|---|---|---|
| Header-ready | ❌ | ✔ |
| Custom connections | ✔ | Limited |
| Breadboard plug-in | ❌ (requires headers) | ✔ |
| Suited for custom PCBs | ✔ | Less ideal |
The headerless version is perfect when you want fine-grain control over connectors and wiring.
📌 Summary
The Original Arduino Micro without Headers (A000093) is an official microcontroller board built around the ATmega32U4. Its compact, headerless design lets you customize connectors and embed it cleanly into projects. With native USB support and plenty of I/O, it’s great for interactive devices, compact robotics, and embedded systems.
