| Specification | Teensy 2.0 | Teensy++ 2.0 | Teensy 3.0 | Teensy 3.1 |
|---|---|---|---|---|
| Processor | ATMEGA32U4 8 bit AVR 16 MHz | AT90USB1286 8 bit AVR 16 MHz | MK20DX128 32 bit ARM Cortex-M4 48 MHz | MK20DX256 32 bit ARM Cortex-M4 72 MHz |
| Flash Memory | 32256 | 130048 | 131072 | 262144 |
| RAM Memory | 2560 | 8192 | 16384 | 65536 |
| EEPROM | 1024 | 4096 | 2048 | 2048 |
| I/O | 25, 5 Volt | 46, 5 Volt | 34, 3.3 Volt | 34, 3.3V, 5V tol |
| Analog In | 12 | 8 | 14 | 21 |
| PWM | 7 | 9 | 10 | 12 |
| UART,I2C,SPI | 1,1,1 | 1,1,1 | 3,1,1 | 3,2,1 |
| Price | $16.00 | $24.00 | $19.00 | $19.80 |
The 128x64 Graphics LCD can be used with Teensy 2.0 and Teensy++ 2.0 and Teensyduino using this GLCD library. They fit together nicely on a single breadboard.