Arduino

ARDUINO SEVERINO SERIAL SINGLE SIDED VERSION 3 S3v3 (REVISION 2) USER MANUAL

X1:
DE-9 serial connector Used to connect computer (or other devices) using RS -232 standard. Needs a serial cable, with at least 4 pins connected: 2, 3, 4 and 5. Works only when JP0 is set to 2-3 position.

DC1:
2.1 mm. power jack Used to connect external power source. Centre positive. Voltage Regulator Workswith regulated +7 to +20 volts DC (9v. to 12v. is recommended). It is possible to alternatively connect external power using 9v. pin or 5v. pin. (see POWER PINOUT)

ICSP:
2x3 pin header Used to program Atmega with bootloader. The number 1 on both sides of the board indicates cable pin1 position. Used to upload sketches on Atmega ICs without bootloader (available only in Arduino IDE versions 0011and 0012).

JP0
3 pins jumper When in position 2-3, this jumper enables serial connection (through X1 connector) to/from computer/devices. Use this as default position. When in position 1 -2, it disables serial communication, and enables external pull -down resistors on pin0 (RX) and pin1 (TX). Use this only to prevent noise on RX (that seems incoming data to Atmega), that sometimes makessketch not starting. When removing this jumper, serial communication pin0 and pin1 work as a normal (flo ating) digital more digital pins are needed, but only when serial not necessary. External pull-down/pull -up resistor is is disabled, and pin. Useful when communication is required.

JP4
2 pins jumper When in position 1 -2, this jumper enables auto reset feature, useful when uploading a sketch toArduino, resetting Atmega automatically. It makes unnecessary to press reset button (S1) when uploading sketches. Be sure that computer COM Port speed is set to 19200bps otherwise auto reset will not work properly. If removed, disables auto reset feature. Very useful to prevent undesired Atmega reset when using sketches that needs serial communication. Auto reset works with DTR pulse on serialpin4. Sometimes Arduino senses a DTR pulse when connecting X1 (serial connector) and some softwares sends a DTR pulse when it starts or when it closes , that makes Atmega reset when not desired.

S1
Tactile button This button resets Atmega, to restart uploaded sketch or to prepare Arduino to receive a sketch through serial connector (when auto reset is not active).

LEDS
Indicative leds POWERled Turns on when Arduino is powered through DC1, +9v. pin or +5v. pin. RX led Blinks when receiving data from computer/device through serial connection. TX led Blinks when connection.

sending

data

to

computer/device

through

serial

L led This led is connected to digital pin13 with a current limiter resistor (that doesn’t affect pin13). Useful to test sketches. It is normal toblink when bootloading too.

POWER PINOUT
6 pin header RST pin Makes Atmega reset when connected to GND. Useful for Shield Boards, or to connect external reset. NC pin This pin is not connected in Arduino S3v3. Arduino Diecimila has a 3.3 volts pin in the same position.

+9v. pin When Arduino DC1 is powered (with battery or DC adaptor), this pin is used as Vout, with the same voltagesupplied on DC1 (see DC1), minus 0,7 volts. The total supplied current depends on external power source capacity When Arduino DC1 is not powered, +9v. pin can be used as Vin, connecting it to a external regulated power source (+ 7 to +20 volts) and connecting 0v . pin to external power source GND. In this case, +5v. pin can be used as Vout, supplying +5 volts. +5v. pin When Arduino DC1 is powered (withbattery or DC adaptor), + 5 v . pin supplies +5 volts as a Vout pin. The total s upplied current depends on Voltage Regulator (7805 supplies up to 1A). This applies only to +5v. pin: Atmega in/out pins only supplies max. 40mA on each pin. When Arduino DC1 is not powered, this pin can be used as Vin, connecting it to a regulated +5v. and connecting 0v . pin to power source GND. In this case, +9v...