The “ESP32 ArduinoCore Interface – ADC” provides a seamless integration between the ESP32 microcontroller and the Arduino development environment, specifically focusing on the Analog-to-Digital Converter (ADC) functionality.
ADC
| Term | Description |
|---|---|
| ADC | Analog-to-Digital Converter – A device or circuit that converts analog signals to digital data. |
| Functionality | Converts continuous analog signals into discrete digital values. |
| Process | Samples the analog input signal at regular intervals and quantizes the sampled values into digital values. |
| Applications | Used in microcontrollers, data acquisition systems, sensors, audio equipment, communication devices, and more. |
| Resolution | The number of digital bits used to represent the analog signal. Higher resolution ADCs provide more precise representations. |
| Sampling Rate | Determines how frequently the ADC samples the analog input signal. Higher sampling rates enable more accurate representation of fast-changing signals. |
| Types | Successive approximation, delta-sigma, pipeline, and flash ADCs are common types, each with specific advantages and applications. |
| Interface | Interfaces with digital systems such as microcontrollers or computers, where the digital output values can be processed or stored. |
ADC Pins
| Pin | ADC Channel | GPIO Number |
|---|---|---|
| GPIO32 | ADC1_CH4 | 32 |
| GPIO33 | ADC1_CH5 | 33 |
| GPIO34 | ADC1_CH6 | 34 |
| GPIO35 | ADC1_CH7 | 35 |
| GPIO36 | ADC1_CH0 | 36 |
| GPIO37 | ADC1_CH1 | 37 |
| GPIO25 | ADC2_CH8 | 25 |
| GPIO26 | ADC2_CH9 | 26 |
This table lists the ADC pins available on the ESP32 microcontroller along with their corresponding ADC channels and GPIO numbers.
Code
/*
AnalogReadSerial
Reads an analog input on pin 0, prints the result to the serial monitor.
Graphical representation is available using serial plotter (Tools > Serial Plotter menu)
Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
This example code is in the public domain.
*/
// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(sensorValue);
delay(1); // delay in between reads for stability
}
Code Explanation of ESP32 ArduinoCore Interface ADC
Code Purpose: Reading an analog input from pin A0 and printing the value to the serial monitor.
Setup Routine: This part of the code initializes serial communication at a baud rate of 9600 bits per second.
// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}
Loop Routine:
- This section continuously reads the analog value from pin A0 using the
analogRead()function. - It then prints the value to the serial monitor using
Serial.println(). - A small delay of 1 millisecond is added between reads for stability using
delay().
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(sensorValue);
delay(1); // delay in between reads for stability
}
Overall Functionality: This code can be useful for testing analog sensors or for basic data-logging applications.
Advantage of ESP32 ArduinoCore Interface ADC
| Advantage | Description |
|---|---|
| Analog Signal Processing | ADCs enable microcontrollers to process analog signals from the physical world, converting them into digital values that can be processed by digital systems. |
| Sensor Interfacing | ADCs facilitate interfacing with various sensors that produce analog output, such as temperature sensors, light sensors, and pressure sensors, allowing accurate measurement and response to real-world phenomena. |
| Signal Conditioning | ADCs can be used for signal conditioning tasks, including amplification, filtering, and noise reduction, before converting analog signals to digital form, improving accuracy and reliability of measured data. |
| Data Acquisition | ADCs enable microcontrollers to acquire data from analog sources at high speeds and with high precision, suitable for applications such as data logging, instrumentation, and control systems. |
| Versatility | ADCs come in various resolutions, sampling rates, and input voltage ranges, allowing developers to choose the most suitable ADC for their specific application requirements. |
| Integration | Many microcontrollers, including the ESP32, feature built-in ADCs, eliminating the need for external ADC components and reducing system complexity and cost. |
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