Fingerprint Sensor AS608 - A Beginner's Guide
One touch can replace keys. This project uses an optical fingerprint sensor to enroll users and then grant access with a quick scan.
read tutorial →The Teensy 3.6 without headers is one of the most capable boards in the Teensy 3.x line. It gives you more speed, more memory, more buses, and more I/O for bigger robotics, audio, USB host, and data-heavy projects.
With its 180 MHz ARM Cortex-M4, larger RAM and Flash, USB host support, and native SD features, it is a strong fit when a compact board still needs serious embedded power.
| Product | Best for | Core / Speed | Main edge |
|---|---|---|---|
| Teensy 3.5 without headers | More I/O with easier 5V digital interfacing | 32-bit Cortex-M4 / 120 MHz | More I/O and 5V-tolerant digital inputs |
| Teensy 3.6 without headers | Bigger legacy builds, audio, USB host | 32-bit Cortex-M4 / 180 MHz | Legacy high-end 3.x board with USB host |
| Teensy 4.0 | Fast DSP, displays, robotics, compact high-speed work | 32-bit Cortex-M7 / 600 MHz | Very high speed in a tiny footprint |
| Teensy 4.1 Development Board | Large systems, Ethernet, SD, memory expansion | 32-bit Cortex-M7 / 600 MHz | Most I/O, SD, Ethernet, memory expansion |
Choose it for advanced robots, polyphonic or effect-heavy audio devices, USB host tools, large LED and display systems, and projects that need more buses and RAM than smaller boards.
Pair it with the Audio Adapter Board for Teensy 3.x, a microSD setup, sensors, and header pins or sockets that match your build style.
Useful add-ons include audio hardware, CAN transceivers, displays, microSD storage, and sensor modules that benefit from multiple I2C, SPI, and serial ports.
| Product | Teensy 3.6 without headers |
|---|---|
| Main MCU | ARM Cortex-M4 |
| Clock Speed | 180 MHz |
| Memory | 1 MB Flash, 256 KB RAM, 4 KB EEPROM |
| USB | USB device 12 Mbit/sec, USB host 480 Mbit/sec |
| I/O Pins | 64 digital I/O, 22 PWM |
| Analog | 25 analog inputs, 2 analog outputs, 11 touch inputs |
| Communication | 6 Serial, 3 SPI, 4 I2C, 2 CAN |
| Storage | Native SDIO SD card support |
| Logic Notes | 3.3V-only signals; not 5V tolerant |
Teensy 3.6 is a 3.3V-only board. Do not drive its digital pins above 3.3V. It offers many extra signals beyond the breadboard edge pins, which is useful for dense custom builds.
Official technical specs · Pinout reference · Schematic reference · Teensyduino setup
1 × Teensy 3.6 board without headers
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One touch can replace keys. This project uses an optical fingerprint sensor to enroll users and then grant access with a quick scan.
read tutorial →Wire a joystick to your Arduino, read X/Y, then print UP / DOWN / LEFT / RIGHT to the serial monitor.
read tutorial →Bench-test a 43 A motor driver before wiring the full project. Catches weak power, mis-pinning, and dead boards before they cost you time.
read tutorial →Coming from UNO and the Pico won't show a COM port? Here's the BOOTSEL trick, the driver fix, and the first sketch that actually works.
read tutorial →Share what you built. Photos, BOM, what worked, what didn't.
view thread →Symptom + what you tried + clear photo = answers within hours.
view thread →Brownout reset when adding a sensor? Notes on supply decoupling and GPIO checks.
view thread →Upload failing on your first Uno? Driver, COM port, board match — checklist inside.
view thread →