The Teensy 4.1 builds on the Teensy 4.0. The 4.1 board is the same size and footprint as the Teensy 3.5/3.6. Most technical specifications are the same as the Teensy 4.0, save for a few expanded features. Some of the more notable features include pins for an Ethernet port (10 / 100 Mbit DP83825 PHY), host USB port, options to expand memory with two locations to solder SOIC memory chips, and a microSD card socket. This runs off of the NXP iMXRT1062 IC , which is a 32-bit ARM Cortex-M7 . It is 3.3V tolerant only on its I/O pins.
Teensy 4.1
Teensy 4.0
The comparsion table between Teensy 4.1 and Teensy 4.0
| Feature | Teensy 4.0 | Teensy 4.1 |
|---|---|---|
| Processor | IMXRT1062DVL6 | IMXRT1062DVJ6 |
| Flash memory | 1984 kbytes | 7936 kbytes |
| EEPROM | 1080 (emu) bytes | 4284 (emu) bytes |
| Digital I/O | 40 pins | 55 pins |
| Breadboard I/O | 24 pins | 42 pins |
| Analog Input | 14 pins | 18 pins |
| Total PWM outputs | 26 pins | 31 pins |
| Serial Ports | 7 | 8 |
| Ethernet | - | 1 |