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How to Use HiLetGo ESP-32: Examples, Pinouts, and Specs
Design with HiLetGo ESP-32 in Cirkit DesignerIntroduction
The HiLetGo ESP-32 is a versatile and powerful microcontroller development board that leverages the capabilities of the ESP32 chip. This board is widely used in the Internet of Things (IoT) projects due to its integrated Bluetooth and WiFi functionalities. It is suitable for a variety of applications, including smart home devices, wireless sensors, and other connected gadgets.
Explore Projects Built with HiLetGo ESP-32
ESP32-Based Smart Motor Control and LED Matrix Display with Microphone Input
This circuit features two ESP-32 microcontrollers interfaced with an INMP441 microphone, multiple motor drivers, and two Adafruit NeoPixel NeoMatrix 8x8 LED displays. The ESP-32 microcontrollers handle data acquisition from the microphone and control the motor drivers and LED displays, enabling a combination of audio processing and visual output.
Open Project in Cirkit DesignerESP32-Based Sensor Monitoring System with OLED Display and E-Stop
This circuit features an ESP32 microcontroller that interfaces with a variety of sensors and output devices. It is powered by a Lipo battery through a buck converter, ensuring a stable voltage supply. The ESP32 collects data from a DHT11 temperature and humidity sensor and a vibration sensor, controls a buzzer, and displays information on an OLED screen. An emergency stop (E Stop) is connected for safety purposes, allowing the system to be quickly deactivated.
Open Project in Cirkit DesignerESP32-Based Smart Weather Station with Wi-Fi Connectivity
This circuit features an ESP32 microcontroller interfacing with various sensors and modules, including a DHT22 temperature and humidity sensor, an ESP32 CAM for image capture, an I2C LCD screen for display, a load cell with an HX711 interface for weight measurement, and a buzzer for audio alerts. The ESP32 handles data acquisition, processing, and communication with these peripherals to create a multi-functional monitoring and alert system.
Open Project in Cirkit DesignerESP32-Based Detection System with IR Sensors and Servo Actuators
This circuit features an ESP32 microcontroller connected to multiple peripherals. Four IR sensors are interfaced with the ESP32's GPIO pins (D34, D32, D33, D27) to likely detect objects or motion. Two servo motors are controlled by the ESP32 (via pins D14 and D15), and an I2C LCD screen is connected for display purposes (using SDA and SCL lines on pins D22 and D21). All components share a common ground and are powered by a shared voltage supply.
Open Project in Cirkit DesignerExplore Projects Built with HiLetGo ESP-32
ESP32-Based Smart Motor Control and LED Matrix Display with Microphone Input
This circuit features two ESP-32 microcontrollers interfaced with an INMP441 microphone, multiple motor drivers, and two Adafruit NeoPixel NeoMatrix 8x8 LED displays. The ESP-32 microcontrollers handle data acquisition from the microphone and control the motor drivers and LED displays, enabling a combination of audio processing and visual output.
Open Project in Cirkit DesignerESP32-Based Sensor Monitoring System with OLED Display and E-Stop
This circuit features an ESP32 microcontroller that interfaces with a variety of sensors and output devices. It is powered by a Lipo battery through a buck converter, ensuring a stable voltage supply. The ESP32 collects data from a DHT11 temperature and humidity sensor and a vibration sensor, controls a buzzer, and displays information on an OLED screen. An emergency stop (E Stop) is connected for safety purposes, allowing the system to be quickly deactivated.
Open Project in Cirkit DesignerESP32-Based Smart Weather Station with Wi-Fi Connectivity
This circuit features an ESP32 microcontroller interfacing with various sensors and modules, including a DHT22 temperature and humidity sensor, an ESP32 CAM for image capture, an I2C LCD screen for display, a load cell with an HX711 interface for weight measurement, and a buzzer for audio alerts. The ESP32 handles data acquisition, processing, and communication with these peripherals to create a multi-functional monitoring and alert system.
Open Project in Cirkit DesignerESP32-Based Detection System with IR Sensors and Servo Actuators
This circuit features an ESP32 microcontroller connected to multiple peripherals. Four IR sensors are interfaced with the ESP32's GPIO pins (D34, D32, D33, D27) to likely detect objects or motion. Two servo motors are controlled by the ESP32 (via pins D14 and D15), and an I2C LCD screen is connected for display purposes (using SDA and SCL lines on pins D22 and D21). All components share a common ground and are powered by a shared voltage supply.
Open Project in Cirkit DesignerTechnical Specifications
Key Features
- Microcontroller: ESP32-D0WDQ6
- Operating Voltage: 3.3V
- Digital I/O Pins: 22
- Analog Input Pins: 6 (ADC, up to 12-bit resolution)
- Analog Output Pins: 2 (DAC, 8-bit resolution)
- Flash Memory: 4MB
- SRAM: 520 KB
- Clock Speed: Up to 240MHz
- Integrated WiFi: 802.11 b/g/n
- Integrated Bluetooth: v4.2 BR/EDR and BLE
- Temperature Range: -40°C to +125°C
Pin Configuration
| Pin Number | Function | Description |
|---|---|---|
| 1 | 3V3 | 3.3V power supply input |
| 2 | GND | Ground |
| 3-18 | GPIO0 - GPIO15 | General-purpose input/output pins |
| 19 | ADC1_CH0 - CH5 | Analog-to-digital converter channels 0 to 5 |
| 20 | DAC1, DAC2 | Digital-to-analog converter channels 1 and 2 |
| 21 | EN | Chip enable, active high |
| 22 | VIN | Voltage input for battery or unregulated power supply |
Usage Instructions
Basic Setup
To use the HiLetGo ESP-32 in a circuit:
- Connect the
3V3pin to a 3.3V power supply. - Connect the
GNDpin to the ground of the power supply. - Use the GPIO pins for digital input/output as required by your application.
- If analog input is needed, connect sensors to the ADC pins.
- For analog output, utilize the DAC pins.
Programming
The ESP-32 can be programmed using the Arduino IDE or other development environments that support the ESP32 platform. To program the board:
- Install the ESP32 board package in the Arduino IDE.
- Select the correct board and port in the Arduino IDE.
- Write your code and upload it to the board.
Example Code
Here is a simple example of how to blink an LED using the ESP-32 and Arduino IDE:
// Define the LED pin
const int LED_PIN = 2; // Use GPIO2 for the built-in LED
void setup() {
// Initialize the LED pin as an output
pinMode(LED_PIN, OUTPUT);
}
void loop() {
// Turn the LED on
digitalWrite(LED_PIN, HIGH);
delay(1000); // Wait for a second
// Turn the LED off
digitalWrite(LED_PIN, LOW);
delay(1000); // Wait for a second
}
Ensure that your code comments are concise and do not exceed 80 characters in line length.
Troubleshooting and FAQs
Common Issues
- Board not detected: Ensure that the USB drivers are installed and the board is selected in the Arduino IDE.
- WiFi or Bluetooth not functioning: Check that the antennas are properly connected and that the correct libraries are included in your code.
- Unexpected resets: This can be caused by insufficient power supply. Make sure that the power source can deliver enough current.
FAQs
Q: Can the ESP-32 be powered by batteries?
A: Yes, the ESP-32 can be powered by batteries connected to the VIN pin.
Q: How do I connect to WiFi using the ESP-32?
A: Use the WiFi.h library in your Arduino code to connect to WiFi networks.
Q: What is the maximum current that the GPIO pins can handle? A: Each GPIO pin can source or sink up to 12 mA.
Q: How can I save power when running on batteries? A: Utilize the ESP32's deep sleep mode to significantly reduce power consumption when the device is not active.
For further assistance, consult the ESP32 datasheet and the HiLetGo ESP-32 forums for community support.