MattairTech MT-DB-U4, User Manual

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MT-DB-U4 User Guide
Pin Capabilities
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Digital: All pins can be used for general purpose I/O
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Supports INPUT, OUTPUT, and INPUT_PULLUP.
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Each pin can source or sink a maximum of 20 mA.
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Internal pull­up resistors of 20­50 Kohms (disconnected by default).
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Use the pinMode(), digitalWrite(), and digitalRead() functions.
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Analog Inputs: 8 pins (MT­DB­U6) or 11 pins (MT­DB­U4) can be configured as ADC
analog inputs.
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These are available using the analogRead() function.
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All pins can be used for GPIO and some pins can be used for other digital functions (ie.
pwm or serial).
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Each pin provides 10 bits of resolution (1024 values).
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Each pin measures from ground to 5.0 volts.
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The upper end of the measurement range can be changed using the AREF pin and the
analogReference() function.
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PWM: 7 pins (MT­DB­U6, MT­DB­U4) or 4 pins (MT­DB­U2, MT­DB­U1) can be configured
as PWM outputs.
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Available using the analogWrite() function.
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Each pin provides 8 bits of resolution (256 values) by default.
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External Interrupts: Up to 8 pins can be configured with external interrupts.
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6 pins (MT­DB­U6), 5 pins (MT­DB­U4), or 8 pins (MT­DB­U2, MT­DB­U1).
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Available using the attachInterrupt() function.
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Serial: 1 pair of pins can be configured for TTL serial I/O.
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MT­DB­U6: Serial1: pin 31 (RX) and pin 32 (TX).
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MT­DB­U4: Serial1: pin 20 (RX) and pin 21 (TX).
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MT­DB­U2, MT­DB­U1: Serial1: pin 15 (RX) and pin 16 (TX).
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SPI: 3 or 4 pins can be configured for SPI I/O (SPI).
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MT­DB­U6: Pin 21 (MOSI), pin 20 (SCK), pin 22 (MISO), and optionally pin 19 (SS, not
currently used).
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MT­DB­U4: Pin 15 (MOSI), pin 14 (SCK), pin 16 (MISO), and optionally pin 13 (SS, not
currently used).
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MT­DB­U2, MT­DB­U1: Pin 2 (MOSI), pin 1 (SCK), pin 3 (MISO), and optionally pin 0
(SS, not currently used).
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SPI communication using the SPI library.
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TWI (I2C): 2 pins can be configured for TWI I/O (Wire).
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MT­DB­U6: Pin 30 (SDA) and pin 29 (SCL).
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MT­DB­U4: Pin 19 (SDA) and pin 18 (SCL).
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MT­DB­U2, MT­DB­U1: TWI not present
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TWI communication using the Wire library.
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LED: One pin can be configured to light the onboard LED (LED_BUILTIN).
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Pin 0 (MT­DB­U6), pin 25 (MT­DB­U4), or pin 13 (MT­DB­U2, MT­DB­U1).
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Bring the pin HIGH to turn the LED on.
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AREF: One pin can be configured as an AREF analog input.
December 30, 2015 17 http://www.mattairtech.com/