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TEENSY 3.2 Development Board

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The Teensy 3.2 is a development board that has a 32-bit ARM Cortex M4 microcontroller that runs at 72MHz that can be programmed using the Arduino software.

 

Teensy 3.2 Pinout Configuration

Pin Category

Pin Name

Details

Power

VIN, 3.3V, Analog GND, GND

VIN – Supply voltage pin when using an external power source (3.6V to 6.0V)

3.3V – Regulated output voltage from the on-board regulator (250mA max.)

Analog GND – Acts as GND for the ADC and DAC, can be connected to GND

GND – Ground pins

Analog Pins

A0 – A9, A14

Pins A0 – A9 and A14 can act as analog inputs with 13-bit resolution

Input/output pins

D0 – D23

24 I/O pins breadboard friendly

Serial

TX1, RX1

TX2, RX2

TX3, RX3

3 serial ports

External interrupts

D0 – D23

All digital pins have interrupt capability

PWM

D3 – D6

D9 –D10

22 PWM pins total

SPI

DIN, DOUT, SCK, CS

SPI port

Inbuilt LED

D13

LED to act as a general-purpose GPIO indicator

I2C

SCL0, SDA0

Inter-Integrated Circuit communication port

CAN

TX, RX

CAN bus ports

Touch sensing

D0 – D1

D15 – D19

D22 – D23

Can be used for capacitive touch sensing

 

Teensy 3.2 Technical Specifications

Microcontroller

MK20DX256

Operating voltage

3.3V

Recommended input voltage for VIN pin

3.6V to 6.0V

Analog inputs

21

Digital I/O pins

34

DC source/sink from I/O pins

10mA

Flash memory

256KB

SRAM

64KB

EEPROM

2KB

Frequency (clock speed)

72MHz

Communication

I2C, SPI, UART, CAN, USB

 

Other Teensy Boards: Teensy LC, Teensy 3.6, Teensy 3.5

Other Development Boards: Arduino, STM32, ESP12, ESP31, Raspberry Pi, ESP8266

 

Teensy 3.2 vs Arduino Uno

Name

Arduino Uno

Teensy 3.2

Processor

ATMega328P

MK20DX256

Operating/input voltage

5V

3.3V

CPU speed

16MHz

72MHz

Analog pins

8

21

Digital IO/PWM

14

34

EEPROM/SRAM(KB)

1/2

2/64

Flash

32K

256K

USB Connector

Mini

Micro

UART

1

3

SPI

1

1

I2C

1

1

 

Understanding Teensy 3.2 Development Board

The Teensy 3.2 is a 32-bit Arduino compatible development board that aims to bring ARM Cortex processing power into a breadboard friendly package for hobbyist use. The 3.2 is the smallest board in the Teensy family of microcontrollers but it does not lack in performance, outperforming the similarly sized Arduino Nano in most aspects.

 

Powering your Teensy 3.2: 

There are three ways of powering your Teensy 3.2 development board:

  • Using the built-in USB micro connector.
  • Supplying a voltage of 3.6V to 6V from an external supply, possibly a 5V regulator. This method is recommended.
  • Supplying 3.3V directly to the 3.3V pin. This method is not recommended since the supply line is directly connected to the microcontroller; any spikes or ripple might lead to damage.

 

Input/Output: 

The Teensy 3.2 has 34 GPIO pins with a current sink/source ability of 10mA. Pull-up resistors can be enabled on the pins.

Most pins have extra functionality as well:

  • Serial ports – receive and transmit data via the UART protocol
  • I2C ports – two-wire communication via the IIC protocol using the Wire library
  • SPI – fast serial communication using the SPI library
  • PWM – output an 8-bit pulse width modulated square wave that is controlled using two functions:
  1. analogWrite() – write the duty cycle of the PWM waveform to the respective pin
  2. analogWriteResolution() – change the PWM resolution from 2 bits to 16 bits
  • Analog pins that can be controlled using three functions:
  1. analogRead() – returns an integer value corresponding to the analog input
  2. analogReference() – selects a reference voltage source for the ADC
  3. analog read resolution() – configure the resolution of the ADC conversion
  • Touch sensing pins – sense touch using capacitive touch sensing, controlled using the touchRead() function
  • Pin 13 has a built-in LED

These special functions and their respective pins are illustrated in the Teensy 3.2 pin diagram shown above.

 

How to Use the Teensy 3.2 Board

The Teensy 3.2 can be programmed using any C editor or the Arduino software, though the latter is quicker and easier for beginners.

The Arduino software download link can be found here:

Download Arduino

Once the software is downloaded and ready, the Teensy 3.2 is connected to the computer through the USB micro port.

 

Uploading Your First Program:

Select the correct board name (Teensy 3.2) in the Tools > Boards menu and select the correct COM port under Tools > Ports.

Since the built-in LED is on pin 13, just like the Arduino, the basic blink sketch will work on the Teensy 3.2. The code is shown below.

 

Applications

  • Rapid prototyping
  • Small size ARM development board
  • Robotics

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