Teensy 4.0: Primary XBAR Pins 1, 2, 3, 4, 5, 7, 8, 30, 31, 32, 33 - Alt Pins: 0, 34, 35, 36, 37, 38, 39

A Teensy board. If you’re on a budget get the Teensy LC, else if you think you may want to do more complex Teensy projects in the future I recommend the more powerful Teeny 3.2. Make sure you get a Teensy with pins, unless you fancy soldering them on yourself. The Teensy product line which is focused on being fast , small and Arduino compatible is developed by the company PJRC. They have a loyal following of designers and advanced hobbyists that create many libraries to take advantage of some of the more advanced features of the Teensy products or to modify Arduino libraries for compatibility. Many of them also participate in the excellent PJRC forum. The forum is targeted towards more advanced users and topics. Serial1.print() can print many different types int number = 1234 ; Serial1 . println ( "string" ) ; // string Serial1 . println ( 'a' ) ; // single character Serial1 . println ( number ) ; // number (base 10 if 16 or 32 bit) Serial1 . println ( number , DEC ) ; // number, base 10 (default) Serial1 . println ( number , HEX ) ; // number, base 16/hexidecimal Serial1 . println ( number , OCT ) ; // number, base 8/octal Serial1 . println ( number , BIN ) ; // number, base 2/binary Serial1 . println ( 3.14 ) ; // number in floating point, 2 digits Serial1.availableForWrite() Windows, Linux and Macintosh are supported. Command Line with Makefile Makefiles for non-graphical use are provided with the Teensyduino installer. report) to automatically switch to programming mode. Program Pushbutton / Pin If code previously written to Teensy is not listening for USB

Real Hardware Serial

many types of libraries to work well when used together. Direct Memory Access (DMA) Teensy 4.0 has a general purpose 32 channel DMA controller. access this memory. AVR libc functions may also be used. Static Allocation Keywords When the compiler builds your program, all global variables, static variables, pinMode INPUT_PULLUP should not be used with pin 13. 5V output pin 17 A copy of the signal at pin 17 is increased to 5 volt range (or with the other audio inputs & outputs. Analog Output (DAC) The DAC output pin can transmit audio. This may be used simultaneously

Teensy Loader now recognizes ARM elf format, will not accidentally program Teensy 3.0 code to a pre-3.0 board. numerically intensive work using integers and pointers. Floating Point Unit The FPU performs 32 bit float and 64 bit double precision math in hardware. than 3.3V. Input Pullup / Pulldown / Keeper Resistors All digital pins have optional pullup, pulldown, or keeper resistors. If the software stops resetting the timer for too long, Teensy reboots. Special Timers These extra timers allow delays, analog sample rate timing, carrier modulation, Teensy 4.1: Primary XBAR Pins 1, 2, 3, 4, 5, 7, 8, 30, 31, 32, 33 - Alt Pins: 0, 36, 37, 42, 43, 44, 45, 46, 47Added partial SoftwareSerial for Teensy 3.0. If the pins match one of the real serial ports, hardware serial is used. This allows use of libraries that are hard-coded for SoftwareSerial. If non-serial pins are specified, only transmit works. Software-based receive is not yet supported (but planned for a future release) defineLED_LAYOUT0 // 0 = even rows left->right, 1 = even rows right->left //TheportionofthevideoimagetoshowonthissetofLEDs.All4numbers //arepercentages,from0to100.

Reducing CPU speed to 528 MHz or lower reduces power consumption. Low Power Features Snooze library Beware that there are clones in the same form factor marketed as "Teensy", but which may or may not work in the same way - maybe because it was based on a Teensy 1.0 and not 2.0. A tool for making holes in the enclosure. Scissors/craft knife will be fine for cardboard enclosures, however you’ll probably need a Dremel (or something similar) for plastic or wood enclosures. The board optionally ships with the male headers loose. This provides maximum flexibility depending on how the board will be used or they can be replaced with other types of connectors such as female headers or shorty headers as shown belowTeensy-LC delivers an impressive collection of capabilities to make modern electronic projects simpler. It features an ARM Cortex-M0+ processor at 48 MHz, 62K Flash, 8K RAM, 12 bit analog input & output, hardware Serial, SPI & I2C, USB, and a total of 27 I/O pins. When MIDIx4 or MIDIx16 is selected, Teensy implements virtual cables/ports. All of the send functions can accept There is also a larger variant: the Teensy++ 2.0 with a AT90USB1286 chip that has more I/O pins. The Teensy++ is not a drop-in replacement for the Teensy but similar enough that firmwares often support both with minimal code changes. if ( button3 . fallingEdge ( ) ) { Keyboard . press ( KEY_MEDIA_VOLUME_DEC ) ; Keyboard . release ( KEY_MEDIA_VOLUME_DEC ) ; } if ( button4 . fallingEdge ( ) ) { Keyboard . press ( KEY_MEDIA_VOLUME_INC ) ; Keyboard . release ( KEY_MEDIA_VOLUME_INC ) ; } if ( button6 . fallingEdge ( ) ) { Keyboard . press ( KEY_MEDIA_EJECT ) ; delay ( 300 ) ; // Mac OS-X will not recognize a very short eject press Keyboard . release ( KEY_MEDIA_EJECT ) ; }