![]() Thanks for the info on using serial input as a command. Wow! 49 switches with only using 14 inputs! Fantastic but I looked at the library and it is above my level of expertise but I will work towards it. Incidentally some MEGA clones (I know of the Seeeduino one) bring out more pins to headers, the Arduino Mega Pinout Voltage Regulator-The voltage regulator converts the input voltage to 5V. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It has a crystal oscillator-16 MHz, a power jack, an ICSP header, a USB-B port, and a RESET button. The typical input resistance of CMOS circuit at room temperature is in the 10^10 to 10^11 ohms range,Īt higher temperatures it can drop preciptously to 10^8 ohms or so, in practice you've never notice. Arduino Mega 2560 has 54 digital input/output pins, where 16 pins are analog inputs, 14 are PWM pins, and 6 are hardware serial ports (UARTs). TheyĪre exactly the same as any other digital pin when used as digital pins. The analog pins are only connected to the ADC when a call to analogRead selects them anyway, so if youĭon't call analogRead on a pin, its isolated from the ADC (again by a practically infinite resistance). Shows the equivalent circuit and load capacitance which become important at higher frequencies. The ADC has a much higher impedance than that - it is precise to better than one part in 1024 with a 10kĭriving impedance, so clearly its impedance must be > 10M - at DC. Defines all available digital input/output pins of ATmega2560, with reference to Arduino MEGA pins. the ADC 30k impedance) - or if that only comes into play given an analogRead (vs. ![]() ![]() I'm not certain how well the "analog in" pins work as digital inputs (viz. Analog Input Pins are 16 DC Current for each input/output pin is 40 mA DC. All pins are capable of digital output, even the "analog in" pins. The digital input/output pins are 54 where 15 of these pins will supply PWM o/p.
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