Timers and Pins
- Timer0 - Used for millis and delay; also analogWrite/PWM on pins 5 and 6
- Timer1 - analogWrite/PWM functions on pins 9 and 10; Servo library; Tone library (second tone)
- Timer2 - analogWrite/PWM functions on pins 3 and 11; Tone library (first tone)
- On a standard Arduino board, the first tone will use timer 2 (so PWM on pins 9 and 10 will not be available);
- the second tone uses timer 1 (preventing the Servo library and PWM on pins 11 and 12 from working).
- On a Mega board, each simultaneous tone will use timers in the following order: 2, 3, 4, 5, 1, 0.”
- The Servo library uses the same timer as analogWrite on pins 9 and 10, so you can’t use analogWrite with these pins when using the Servo library.
Arduino Pro Mini
- Official Arduino Pro Mini site
- Arduino USB-to-Serial Tutorial - Programming the Pro Mini - great in-depth tests with various USB to serial devices by Julian Ilett.
Pin Connections as described on weworkweplay:
- Connect USB DTR to Arduino GRN, aka DAW on some boards
- Connect USB RXD to Arduino TXD
- Connect USB TXD to Arduino RXI
- Connect USB 3.3V to Arduino VCC
- Connect USB Ground to Arduino BLK, aka GND on some boards
See the Official Arduino Nano site for board details.
- Operating Voltage (logic level) 5 V
- Input Voltage (recommended) 7-12 V
- Input Voltage (limits) 6-20 V
The power source is automatically selected to the highest voltage source from one of:
- the Mini-B USB connection
- 6-20V unregulated external power supply (pin 30)
- 5V regulated external power supply (pin 27)