> ## Documentation Index
> Fetch the complete documentation index at: https://docs.deneyapkart.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Pin Definitions (DYM)

## Power Pins

* **5V –>** Directly connected to the USB input port. It provides the voltage (5V) and current output capacity of the connected USB power source. It is recommended to use a power source between 500 mA and 1000 mA. It can be used to power externally connected units.
* **3V3 –>** Provides a 3.3V voltage and up to 1A current output through a DC-DC step-down regulator. It can be used to power externally connected units.
* **EN –>** This pin must be held at **logic “1” (3.3V)** level to enable operation of the ESP32-S2 microcontroller. This is ensured by an internally placed pull-up resistor. The **“RES”** button is connected to this pin and is used to reset the system. When the button is pressed, the **EN** pin is pulled to **logic “0” (0V)** level.
* **GND –>** Common ground line of the circuit for all power and logic connection pins.

## Logic Pins (Input/Output Pins)

* **D0 – D13 –>** Used as digital input/output pins. **Logic “0” corresponds to 0V; logic “1” corresponds to 3.3V** voltage level. All of these pins can be used as PWM pins. The pins are **not 5V tolerant.**

## Analog Pins

* **A0 – A6 –>** Used as input pins for analog signals in the range of 0V – 3.3V. All of these pins can also be used as digital input/output pins.
* **DA0 – DA1 –>** Used to provide analog signal output in the range of 0V – 3.3V. They can also be used as digital input/output pins. They are respectively connected to **D12** and **D11** pins.

## Communication Pins

* **TX – RX –>** Serial communication (UART) pins. Firmware upload and terminal communication are performed through these pins. **TX** is the output pin, while **RX** is the input pin. Besides UART communication, they can also be used as digital input/output pins. They are also referred to as **D1 (TX)** and **D0 (RX)**.
* **I2C –> SDA** and **SCL** pins can be used to control any sensor or actuator. **SDA (input/output)** is the data line; **SCL (output)** is the clock (timing) synchronization pin. These pins are held at **logic “1” (3.3V)** level with 10K pull-up resistors. Besides I2C communication, they can also be used as digital input/output pins. They are also connected to **D8 (SDA)** and **D7 (SCL)** pins.
* **SPI –> MOSI, MISO, SCLK,** and **SS**\* pins can be used to control any sensor or actuator. **MOSI (output)** is the data pin, **MISO (input)** is the data pin, **SCLK (output)** is the clock (timing) synchronization pin, and **SS** is the slave select pin. These pins can also be used as digital input/output pins. They are also referred to as **SS (D10), SCLK (D6), MISO (D5),** and **MOSI (D4)**.

## PWM Pins

* **PWM –> PWM0** and **PWM1** are pulse-width modulation (PWM) square wave output pins. They are also connected to **D2** and **D3** pins and can be used as digital input/output pins.
* All digital input/output pins **(D0–D13)** can be used as PWM pins.

## Capacitive Touch Pins

* **T0 – T8 –>** Input pins used for capacitive touch sensing. They are also connected to **T0 (A0), T1 (A1), T2 (A2), T3 (A3), T4 (A4),** and **T5 (A5)** pins and can be used as digital input/output pins.

## RGB Pins

* **LEDR –>** Pin connected to the internal red LED; external connection is not available.
* **LEDG –>** Pin connected to the internal green LED; external connection is not available.
* **LEDB –>** Pin connected to the internal blue LED; external connection is not available.

## Button Pin

* **GPKEY –>** Pin connected to the internal general-purpose button. It is also used to put the system into manual upload mode. It is held at **logic “1” (3.3V)** level with a 10K pull-up resistor. It is also connected to **D13** pin and can be used as a digital input/output pin.

## Programming Pins

* **EN –>** This pin must be held at **logic “1” (3.3V)** level to enable operation of the ESP32-S2 microcontroller. This is ensured by an internally placed pull-up resistor. The **“RES”** button is connected to this pin and is used to reset the system. When the button is pressed, the **EN** pin is pulled to **logic “0” (0V)** level.
* **BOOT –>** Used to put the system into manual upload mode. It is the pin to which the internal general-purpose button (BUT) is connected. It is held at **logic “1” (3.3V)** level with a 10K pull-up resistor. It is also connected to **D13** pin.