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The Teensy 3.5 is a compact, powerful USB development board built around a 32-bit ARM Cortex-M4 processor running at 120 MHz with a hardware floating-point u...
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The Teensy 3.5 is a compact, powerful USB development board built around a 32-bit ARM Cortex-M4 processor running at 120 MHz with a hardware floating-point unit. With 512 KB of flash, 256 KB of RAM, and 64 digital I/O pins (all 5V tolerant), it packs serious capability into a small form factor.
Features include a built-in SD card slot with native 4-bit SDIO, dual DAC outputs, 27 analogue inputs, and extensive communication interfaces. All Teensy boards ship assembled and fully tested.
Key Features
- 120 MHz Cortex-M4 – With hardware floating-point and DSP extensions
- 512 KB Flash / 256 KB RAM – Ample space for complex projects
- 64 Digital I/O Pins – All 5V tolerant
- 27 Analogue Inputs – High channel count for sensor-heavy projects
- 2× DAC Outputs – Analogue audio and signal generation
- 20 PWM Outputs – For motors, LEDs, and servos
- Built-In SD Card Slot – Native 4-bit SDIO for fast data logging
- USB Device Interface – Configurable as serial, MIDI, audio, keyboard, joystick, and more
- 6 Serial / 3 SPI / 3 I²C – Plus CAN bus and I²S/TDM digital audio
- Real-Time Clock – With optional coin cell backup
Specifications
- Processor – ARM Cortex-M4 (MK64FX512)
- Clock Speed – 120 MHz
- Flash – 512 KB
- RAM – 256 KB
- EEPROM – 4 KB (emulated)
- DMA Channels – 16
- USB – 12 Mbps device
- Dimensions – 2.4 × 0.7 inches (61 × 18 mm)
Ideal For
- Audio and music synthesis projects
- Data logging with SD card
- USB MIDI controllers and HID devices
- Signal processing and sensor arrays
Package Contents
- 1× Teensy 3.5 (assembled and tested)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ARM Cortex-M4
- A 32-bit processor core commonly used inside microcontrollers for running embedded programs. It matters because it gives the micro:bit enough processing power for sensors, Bluetooth, sound, and classroom coding projects.
- CAN bus
- CAN bus is a reliable two-wire communication network originally designed for vehicles and now common in machinery and robotics. It matters when you need multiple controllers or devices to share status and control messages in a noisy electrical environment.
- DAC
- A digital-to-analogue converter turns numbers from the microcontroller into a real analogue voltage. It matters if you want to generate simple waveforms, audio-style signals, or variable control voltages rather than just on/off outputs.
- EEPROM
- A type of non-volatile memory that keeps stored data even when power is turned off. In a sensor module, it can be used to store settings or calibration data so they do not need to be re-entered every time.
- HID
- Human Interface Device is a USB device class used for keyboards, mice, gamepads and similar controls. If a board supports HID over USB, it can act like an input device to a computer without needing a custom driver.
- MIDI
- MIDI is a standard way for electronic instruments, controllers, and software to send musical control messages such as notes, velocity, and timing. If a board supports MIDI, it can be triggered from keyboards, drum pads, sequencers, or other music gear rather than only from buttons or code.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- RAM
- RAM is temporary memory used while a device is running, and its contents are lost when power is removed. A “Run in RAM” mode is useful for testing settings without permanently programming the module, but it may not support every feature.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
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