until otherwise told by Paul, I would assume the pins to read (bottom view from left to right)
Reset, Program, GND, 3.3V, VBat
i.e. the same as for T3.5/6
On Teensy 4.0/4.1, it isn't reset, but on/off. See my post above. On the Teensy 3.0, 3.5, and 3.6 it was reset. On the Teensy 3.1, 3.2, and LC it is the DAC (A14 or A12) that you can use to play mono sounds.
So to be more pedantic, in case somebody else reads the thread with the same question.
- On the Teensy 3.0, the pins are Reset, Program, Ground, 3.3v, and Vbat;
- On the Teensy 3.1 and 3.2, the pins are DAC (A14), Program, Ground, 3.3v, and Vbat;
- On the Teensy 3.5 and 3.6, the pins are Reset, Program, Ground, 3.3v, and Vbat;
- On the Teensy 4.0 and 4.1, the pins are On/off, Program, Ground, 3.3v, and Vbat;
- On the Teensy LC, the pins are DAC (A12), Program, Ground, 3.3v, and level shifter to convert pin 17/A3 to VIN for use with WS2812B LEDs (the LC doesn't have a usable real time clock).
The pins are at the end of the Teensy for the 3.0, 3.1, 3.2, 4.0, and LC.
The pins are adjacent to the micro-SD card for the 3.5, 3.6, and 4.1.
To use the real time clock on the Teensy 3.0, 3.1, or 3.2, you need to solder in a 32.768kHz crystal to the two pins on the Teensy for the crystal (see the back of the pinout card). The Teensy 3.5, 3.6, 4.0, and 4.1 have an internal crystal and you don't need to solder one.