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What is ADC pin?
An Analog to Digital Converter (ADC) is a very useful feature that converts an analog voltage on a pin to a digital number. On the Arduino board, these pins have an ‘A’ in front of their label (A0 through A5) to indicate these pins can read analog voltages. ADCs can vary greatly between microcontroller.
How do I add an analog pin to my Arduino?
There are a several ways to connect 8 analog inputs to an Arduino.
- Add an analog multiplexer, as georgebrindeiro suggested. Such as: (a), (b), (c), (d), etc.
- Replace the Arduino with one that has enough analog inputs already built-in.
- Add one or more external ADCs, and connect it to digital pins of your CPU.
What does an ADC pin on an ESP8266 mean?
Now, the ESP8266 v7 and v12, include an ADC (Analog digital converter) pin. This means that the ESP8266 module can process inputs from analog sensors. Light sensors, rheostats, force sensors, etc. This is loosely comparable to an Arduino ‘Analog IN’ pin. With an ADC capability, instead of just ON or OFF, the ESP8266 can read a range.
Where are the analog and digital ground pins on an ADC?
The labels, “analog ground” and “digital ground,” on these pins refer to the internal parts of the converter to which the pins are connected and not to the system grounds to which they must go. For an ADC, these two pins should generally be joined together and to the analog ground of the system.
Why are the two pins on an ADC not joined together?
For an ADC, these two pins should generally be joined together and to the analog ground of the system. It is not possible to join the two pins within the IC package because the analog part of the converter cannot tolerate the voltage drop resulting from the digital current flowing in the bond wire to the chip.
Can a GPIO pin be used for an ADC function?
The below table shows the ADC input pins multiplexed with other GPIO pins. The ADC pin can be enabled by configuring the corresponding ACON1 register. When the ADC function is selected for a pin ,then other Digital signals are disconnected from the ADC input pins.