Teensy 3.5 microcontroller overview

The Teensy 3.5 is a development board with a 32-bit ARM processor. It has a large number of interfaces and high computing power, enabling it to be used in a wide range of applications. In particular, it can emulate USB devices, so is often used to develop HID or MIDI peripherals.

Microcontroller features

The Teensy 3.5 microcontroller uses the ARM Cortex-M4 microprocessor. This processor operates at a clock frequency of 120 MHz, and has 256 kB RAM, 4 kB EEPROM and 512 kB Flash memory (for programming and data storage).

CPU ARM Cortex-M4 Voltage : 5V Flash : 512 kB RAM : 256 kB EEPROM : 4 kB Clock speed : 120MHz WiFi : No Bluetooth : No SD : Yes

The Teensy 3.5 microcontroller also features an SD card slot for storing files for websites, for example…

Power supply

The Teensy 3.5 microcontroller operates over a voltage range of 3.6-6V, thanks to its on-board voltage regulator, while the microprocessor operates at 3.3V. In normal operation, the microcontroller consumes up to 50mA (if no power is supplied) and can accept a maximum current of NCmA on each of its IO pins.

Pinout

• Analog I/O : 27 (A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26)
• Digital I/O : 40 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
• PWM pins: 20 (2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 20, 21, 22, 23, 29, 30, 35, 36, 37, 38)
• Communication Série : 6 ((0, 1), (9, 10), (7, 8), (31, 32), (34, 33), (47, 48))
• I2C communication: 3 ((’18’, ’19’), (’38’, ’37’), (‘4’, ‘3’))
• SPI communication: 3 ((’10’, ’13’, ’12’, ’11’), (’31’, ’32’, ‘1’, ‘0’), (’43’, ’46’, ’45’, ’44’))
• I2S communication: 1 ((’26’, ’25’, ’33’))
• Interrupt: 40 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)

Basic code and pin identification

To use the input/output pins in the code, simply use the labels present on the board, i.e. 0-57 for digital pins and A0-A26 (or 0-26) for analog pins.

const int analogPin=A0; // broches A0-A26
const int digitalInPin=2; // broches 0-57
const int digitalOutPin=4; 
const int pwmPin=3; //2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 20, 21, 22, 23, 29, 30, 35, 36, 37, 38

int analogVal=0;
int digitalState=LOW;
int pwmVal=250;

void setup() {
  Serial.begin(9600);
  
  pinMode(analogPin,INPUT_PULLUP); // Argument OUTPUT, INPUT, INPUT_PULLUP
  pinMode(digitalInPin,INPUT);
  pinMode(digitalOutPin,OUTPUT);
  pinMode(pwmPin,OUTPUT);
}

void loop() {
 analogVal=analogRead(analogPin); // return int
 digitalState=digitalRead(digitalInPin); // return boolean
 digitalWrite(digitalOutPin,HIGH); // valeur LOW(0) ou HIGH(1)
 analogWrite(pwmPin,pwmVal);// valeur 0-255 en fonction de analogWriteResolution();
}

Summary of features

Where to start

Sources

• Reference PJRC
• Teensyduino link