Teensylu v0.8 controller

Advantage:

1. 4 pololu stepper driver( X, Y,Z and extruder) interface( no voltage adjuster).

2. Support multiple power supply structure.

- Logical and motor supplied by ATX( 12V 25A power supply with ATX-).

- Motor screw pin 7-35V 5mm(12V 5A power supply motor and logical supply also work).

- Logical part can be supplied 5V by USB.

3. 2 thermistor connector.

4. 2 N-MOSFET drive extruder and heated bed.

5. 1 MOSFET drive cooling fan.

6. 12V and 5V endstops voltage including 4 endstops. The fourth endstop is for extruder emergency stop use.

7. 14 unused pin for future developing. 6 analog and 8 digital( totally compatible with sanguinololu) with following function

- UART1 (RX and TX)

- I2C(SDA and SCL)

- SPI(MOSI, MISO, SCK)

- PWM(1)

- Analog I/O(6)

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