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Frequently Asked Questions

What kind of power does Teensy 4.0 use?

The Teensy 4.0 operates at 3.3V internally and expects I/O to not exceed 3.3V. It is not 5V tolerate on any of its pins except for the VIN and VSUB pins which can be used to supply 5V power to the module. If you use any 5V peripherals that drive signals back to the Teensy 4.0, be sure to utilize logic level shifters to avoid possible damage.

How do I install Teensy 4.0 on my computer?

CircuitPython provides a .HEX file which you program onto Teensy 4.0 using Teensy Loader. Then Teensy appears to your computer as a USB disk, where copy or save your Python code. CircuitPython does not fully support all of Teensy 4.0's hardware. Makefiles for non-graphical use are provided with the Teensyduino installer.

Which is bigger Teensy 4.0 or 4.1?

It is a bigger size than the 4.0 but adds more peripherals, memory, and GPIOs. PJRC, however, says that both Teensy 4.1 and 4.0 serve different segments of the market, so one is not a replacement for the other.

Is there a USB port on Teensy 4.0?

The USB port on the Teensy 4.0 has significant functionality not available on a normal Arduino. For most standard applications it should be set to the default “Serial” mode which is how it works with an Arduino. If you have problems connecting to the Teensy, check this setting.


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