None of the Arduino Mega2560 R3 boards sold on the internet at this price are original, they are all copies. It is NOT an original Arduino board, but is similar. The Mega 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. It has 54 digital input/output pins (of which 15 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. The Osoyoo Mega2560 Board is fully compatible with Arduino Mega2560 rev.3, it is a microcontroller board based on the ATmega2560. This gives your projects plenty of room and opportunities.” - Overview With 54 digital I/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects. If we tried to measure a five volt range with a two-bit resolution, and the measured voltage was four volts, our ADC would return a numerical value of 3 as four volts falls between 3.75 and 5V.“The MEGA 2560 is designed for more complex projects. A 2-bit resolution would allow four (two to the power of two) values zero, one, two, and three. Measure the resolution in the terms of the number of bits of resolution.įor example, a 1-bit resolution would only allow two (two to the power of one) values zero and one. The higher the resolution, the greater accuracy with which something can be represented. The resolution is the degree to which something can be represented numerically. The analogRead() returns the value from 0 to1023, this is because of the resolution of the ADC. Potentiometer is connected at analog pin 0: This code measures analog signal from A0 pin of Arduino every one second and prints value on serial monitor. The voltage in between (0-5) volts will give numbers between those values. Similarly, if we apply 5 volts on the ADC pin, an analogRead() output will provide 1023 digital values. The reason for value 1023 is because the analog to digital converters is 10-bit long.įor example, if we apply 0 volts on the ADC pin, an analogRead() output will provide zero digital value. AnalogRead() Function ArduinoĪrduino AnalogRead function is used to measure the voltage between 0 to 5 volts and converts it into a digital value between 0 to 1023. (This is calculated by dividing 1024 into 5V). So if you have a reference voltage of 5V, each unit returned by analogRead() is valued at 0.00488 V. For the more popular Arduino boards such as the Uno, Mega boards, the operating voltage of 5V. In normal analogRead use, the reference voltage is the operating voltage of the board. So Arduino has an ADC with a 10-bit resolution. That means the Arduino ADC range is between 0 to 1023, so have 1024 possible values or 2 to the power of 10. This error can be minimized by using higher bits ADC.Īs we mentioned earlier, Each analog channel of Arduino is 10-bit long. Any voltage value between these numbers will be considered as an error. This 2-bit ADC can not measure voltage level between 0-1, 1-2, 2-3, and 3-4. You can also depict from the above table that small bits ADC causes a lot of error. The input voltage and digital output will be according to this table: Analog VoltageĪs you can see from the above table for 2-bit ADC, the one discrete step is equal to one-volt analog input and so on. To understand, ADC resolution let’s take an example of ADC with a 2-bit resolution and a reference voltage of 4 volts, it can only represent the voltage with four possible resulting values that are 2^2. In short, for every 4.88 millivolts of the voltage value of on Arduino analog pin, the digital value will be incremented by one and so on for every multiple voltage of 4.88mV, the respective digital value will be produced. Therefore, each ADC can measure 1024 (2^10) voltage levels and the magnitude of each voltage level or step can be determined by this formula: Discrete Step = Vref / total steps = 5 / 1023 = 0.0048874 = 4.88mv
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