> ## 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 (DYG)

## Power Pins

* **3V3 –>** Provides a 3.3V voltage and up to 1A current output capacity via a DC-DC step-down converter. Output is available when either USB or Li-Po battery power input is connected. It can be used to power externally connected units.
* **VBAT (BAT) –>** Used to connect the power input (V+) terminal of a single-cell Li-Po battery. When powered via the Li-Po battery connector, it can also be used to provide a power output in the range of 3.3V–4.2V.
* **GND –>** The common ground line of the circuit for all power and logic connection pins.

## Logic Pins (Input/Output Pins)

* **All pins can be used as digital input/output pins.** **Logic “0” corresponds to 0V, and logic “1” corresponds to 3.3V.** There are a total of 13 pins. The pins are **not** 5V tolerant.

## Analog Pins

* **A0, A1, SCL, A2, A3,** and **A4** pins are used as input pins for analog signals. There are a total of 6 pins.

## Communication Pins

* **TX – RX –>** Serial communication (UART) pins. Firmware uploading and terminal communication are performed via these pins. **TX** is the output pin and **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 –>** Sensors or actuators can be controlled via the **SDA** and **SCL** pins. **SDA (both input and output)** is the data line, while **SCL (output)** is the clock (timing) synchronization pin. These pins are held at **logic “1” (3.3V)** by 10K pull-up resistors. Apart from I2C communication, they can also be used as digital input/output pins. They are also connected to **D4 (SDA)** and **D6 (SCL)** pins.
* **SPI –>** Sensors or actuators can be controlled via **MOSI, MISO, SCLK,** and **SS**\* pins. **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 (D5), SCLK (A3), MISO (A4),** and **MOSI (A5)**. All digital pins can be used for SPI communication.
* **I2S, TWAI, and IR (Infrared Remote Control) –>** All digital pins can be used.

## PWM Pins

* All digital pins can be used as Pulse Width Modulation (PWM) square wave output pins. They are also referred to as **A0 (PWM0), A1 (PWM1),** and **A2 (PWM2)**.

## JTAG Pins

* **A3, A4, A5,** and **D5** pins can be used to perform **MTMS, MTDI, MTCK,** and **MTDO** functions, respectively.

## RGB Pin

* **RGBLED –>** The pin to which the onboard addressable RGB LED is connected. It is not routed externally via pins. It is also referred to as **D3**.

## Button Pin

* **GPKEY –>** The pin connected to the onboard general-purpose button. It is also used to put the system into manual upload mode. It is held at **logic “1” (3.3V)** with a 10K pull-up resistor. It is also connected to the **D2** pin and can be used as a digital input/output pin.

## Programming Pins

* **CHIP\_EN –>** To enable operation of the ESP32-C3 microcontroller, this pin must be held at **logic “1” (3.3V)**. 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 **CHIP\_EN** pin is pulled to **logic “0” (0V)**.
* **BOOT –>** Used to put the system into manual upload mode. It is the pin connected to the onboard general-purpose button (BUT). It is held at logic **“1” (3.3V)** with a 10K pull-up resistor. It is also connected to the **D2** pin.