The Ultimate Arduino Mega 2560 Hardware Manual is from the same author and the table of contents is about the same as in the first book, but of course tailored to the Mega 2560 board. One difference ...

Observed a 0.4v difference between the actual analog voltage and the voltage read with Internal Analog Reference 1.1v, when an external analog reference voltage is connected to the AREF pin of Arduino ...

[SeanHodgins] has a project in mind where he needs to sample over 500 analog sensors. To get ready, he made a breakout board for 32-channel analog multiplexer device he wants to use. He put the pro… ...

The analog pin 4 is used as SDA by the I2C on Arduino as well as analog pin 5 as SCL. Some pull-up resistors are needed for the I2C lines. During the calibration, the device waits until a measurement ...

Due to these reasons, the A0 pin is connected to the analog pin of Arduino, which makes monitoring the change in output easy. The buzzer, which is used as a signal to the user, can be connected to any ...

The analog voltage for the meter can be generated by PWM. The Arduino PWM outputs have a frequency of about 500Hz which means that the pin cycles from 0 to 5V and back to 0 again 500 times a second.