UnoD1R32-ApplicationShield

🚀 Overview

UNO-D1-R32-ApplicationShield is an open-source firmware project based on ESP-IDF, designed to run on the UNO D1 R32 Board Module (ESP32) with the ARMmbed Application Shield. This project demonstrates the ESP32’s capabilities with practical examples using GPIO, ADC, PWM, I2C, SPI, and UART for embedded applications.

🎯 Purpose

• 🔌 GPIO Control: Read/write digital pins and generate PWM signals using LEDC.
• ⏱️ Timer Management: Use hardware/software timers to detect button presses.
• ⚡ Interrupt Handling: React to button or GPIO events using interrupts.
• 💬 UART Communication: Exchange data with a PC via UART for debugging or control.
• 🌡️ Sensor Interaction: Use I2C/SPI to read sensors and control external devices.
• 🔄 ADC Utilization: Read analog input values such as potentiometer voltage.

📝 Features

Feature	Description
💡 GPIO + PWM	Use gpio and ledc drivers for digital and PWM control.
⏲️ Timer Support	Use esp_timer or hardware timers for time-based events.
⚠️ GPIO Interrupts	Use gpio_install_isr_service for handling input events.
💻 UART Communication	Full duplex serial with uart_driver_install().
🌡️ I2C Sensors	Read LM75 temp sensor, MMA7660 accelerometer via I2C.
📺 SPI LCD	Display sensor or system data using SPI LCD.
🎚️ ADC Readings	Use adc1_get_raw() with calibration for accurate values.

🔌 Application Shield Schematics

🧭 UNO D1 R32 Pinout

🎛️ Example Applications

1. PWM via LED

Utilize PWM (Pulse Width Modulation) to control the brightness of an LED. By adjusting the duty cycle, the LED can be dimmed or brightened, allowing for various visual effects. This is particularly useful for applications such as light dimming or motor speed control.

2. GPIO Input via Joystick

Use the GPIO to read the logical levels from the joystick. The program update outputs such as LEDs based on the current status of the joystick buttons.

3. ADC Potentiometer Reading

Use the ADC (Analog-to-Digital Converter) to read values from a potentiometer. These values can then be used to control parameters such as the brightness of an LED through PWM (Pulse-Width Modulation), allowing the LED intensity to vary according to the potentiometer’s position.

4. PWM via Speaker

Utilize PWM (Pulse Width Modulation) to generate sounds via a speaker. By varying the frequency, not the duty cycle, different tones can be produced. The duty cycle remains constant while frequency changes create distinct audible notes. This method is commonly used for sound generation and simple audio signals."

5. Serial Communication

Establish serial communication between the UnoD1R32 and a PC for data exchange. This can be used for debugging, sending sensor readings, or receiving commands from the computer.

6. I2C Temperature Reading

Use the I2C protocol to communicate with temperature sensors such as the LM75. This data can then be used for environmental monitoring or to trigger actions based on temperature thresholds.

7. SPI LCD Control

Use the SPI protocol to control an LCD display. This application could display system status, sensor readings, or any other relevant information on a small screen.

📁 Code Structure

uno-d1-r32-appshield/
├── main/
│ ├── main.c # Main firmware entry point
│ ├── gpio_ctrl.c # GPIO and PWM control logic
│ ├── adc_ctrl.c # Analog input handling
│ ├── timer_ctrl.c # Software/hardware timer handling
│ ├── uart_comm.c # UART interface
│ ├── i2c_ctrl.c # I2C communication
│ ├── spi_display.c # LCD SPI control
│ └── include/ # Header files
├── components/ # Optional external libs
├── assets/ # Images, config files, schematics
├── CMakeLists.txt
└── README.md

🌟 License

This project is open-source. You are free to use, modify, and contribute.