Arduino Aref Kullanımı. The arduino due has two i2c twi interfaces sda1 and scl1 are near to the aref pin and the additional one is on pins 20 and 21. The default analog reference of 5 volts on 5v arduino boards or 33 volts on 33v arduino boards internal.
If you do provide an external voltage reference to this pin you must call. Lcd vss pin to ground. Then the boot loader takes over and initialises pins 0 and 1 to use serial communication.
It has 54 digital inputoutput pins of which 12 can be used as pwm outputs 12 analog inputs 4 uarts hardware serial ports a 84 mhz clock an usb otg capable connection 2 dac digital to analog 2 twi a power jack an spi header a jtag header a reset button and an erase button.
What state are the pins in when i reset the arduino. What state are the pins in when i reset the arduino. Great tutorial from tronixstuff about the less known arduino aref pin. If you do provide an external voltage reference to this pin you must call.