Arduino Uno Schematic Explained. Arduino uno reference design usb boot en tm reference designs are provided as is and with all faults. This is done using special firmware uploaded to the atmega16u2.
Following figure shows the pinout of the arduino uno board. This means you can connect 8 channel analog sensor inputs for processing. Secondary pins are mostly communications pins such as i2c and spi.
The arduino uno is a microcontroller board based on the atmega8 168 328 uno r3 major in atmega328.
As we discussed in the arduino uno system overview section the role of the usb to uart bridge part is to convert the signals of usb interface to the uart interface which the atmega328 understands using an atmega16u2 with an internal usb transceiver. Reference datasheet for atmega328 arduino uno r3 have 14 digital input output pins which include about 6 pins pwm output 6 analog inputs and one 16mhz ceramic resonator one usb connection and power jack an icsp header in circuit serial. As we discussed in the arduino uno system overview section the role of the usb to uart bridge part is to convert the signals of usb interface to the uart interface which the atmega328 understands using an atmega16u2 with an internal usb transceiver. Start your arduino circuit.
