Design with 4ch 3.3V 5V 12V 24V Digital Logic Level Converter Module Optical Isolation in Cirkit DesignerThe 4-channel Digital Logic Level Converter Module with Optical Isolation is a versatile and reliable component designed for interfacing devices operating at different voltage levels. It enables bidirectional voltage level shifting between 3.3V, 5V, 12V, and 24V logic levels, making it an essential tool for projects involving microcontrollers, sensors, and industrial equipment. The module's optical isolation feature provides robust protection against voltage spikes, noise, and ground loops, ensuring the safety of sensitive components and improving signal integrity.
This circuit uses an ESP32 microcontroller to interface with a 3.3V PNP to 24V NPN photoelectric isolation module, which in turn connects to a 40-pin connector for general-purpose input and output. The 24V power supply provides the necessary voltage for the isolation module and the 40-pin connector, enabling the ESP32 to control and monitor high-voltage signals safely.
Open Project in Cirkit Designer
This circuit integrates a microcontroller with a display, digital potentiometer, IO expander, and opto-isolator board for signal interfacing and isolation. It includes a UART to RS485 converter for serial communication and a power converter to step down voltage for the system. The circuit is designed for control and communication in an isolated and protected environment.
Open Project in Cirkit Designer
This circuit features a LilyGo-SIM7000G module for cellular communication and GPS functionality, interfaced with an RTC DS3231 for real-time clock capabilities. It includes voltage sensing through two voltage sensor modules, and uses an 8-channel opto-coupler for isolating different parts of the circuit. Power management is handled by a buck converter connected to a DC power source and batteries, with a fuse for protection and a rocker switch for on/off control. Additionally, there's an LED for indication purposes.
Open Project in Cirkit Designer
This circuit features an ESP32 Devkit V1 microcontroller connected to a Bi-Directional Logic Level Converter, which facilitates voltage level shifting between the ESP32 and external components. The ESP32 is powered through its VIN pin via an alligator clip cable, and the logic level converter is connected to various pins on the ESP32 to manage different voltage levels for communication.
Open Project in Cirkit DesignerThe following table outlines the key technical details of the 4ch Digital Logic Level Converter Module:
| Parameter | Specification |
|---|---|
| Operating Voltage (Low) | 3.3V or 5V |
| Operating Voltage (High) | 12V or 24V |
| Channels | 4 (bidirectional) |
| Isolation Type | Optical Isolation |
| Maximum Current per Channel | 20mA |
| Signal Direction | Bidirectional |
| Operating Temperature | -40°C to 85°C |
| Dimensions | 50mm x 30mm x 15mm |
| Pin Name | Description |
|---|---|
| VCC_L | Low voltage power supply input (3.3V or 5V). |
| VCC_H | High voltage power supply input (12V or 24V). |
| GND | Ground connection (common for both low and high voltage sides). |
| IN1, IN2, IN3, IN4 | Input pins for low voltage signals (connected to microcontroller or device). |
| OUT1, OUT2, OUT3, OUT4 | Output pins for high voltage signals (connected to high voltage device). |
Power Connections:
VCC_L pin.VCC_H pin.GND pin to the ground of both power supplies.Signal Connections:
IN1, IN2, IN3, and IN4 pins.OUT1, OUT2, OUT3, and OUT4 pins.Bidirectional Communication:
Optical Isolation:
VCC_L and VCC_H are within the specified ranges.The following example demonstrates how to use the module to interface an Arduino UNO (operating at 5V) with a 24V industrial device.
5V pin to the module's VCC_L pin.GND pin to the module's GND pin.VCC_H pin.D2) to the module's IN1 pin.OUT1 pin to the input of the 24V device.// Example code for using the 4ch Digital Logic Level Converter Module
// This code toggles a 24V device ON and OFF using an Arduino UNO.
const int controlPin = 2; // Arduino pin connected to IN1 on the module
void setup() {
pinMode(controlPin, OUTPUT); // Set the control pin as an output
}
void loop() {
digitalWrite(controlPin, HIGH); // Turn the 24V device ON
delay(1000); // Wait for 1 second
digitalWrite(controlPin, LOW); // Turn the 24V device OFF
delay(1000); // Wait for 1 second
}
| Issue | Possible Cause | Solution |
|---|---|---|
| No output signal on the high voltage side | Incorrect power supply connections | Verify that VCC_L and VCC_H are connected to the correct voltage levels. |
| Signal distortion or noise | Insufficient decoupling or noisy environment | Add decoupling capacitors near the power supply pins. |
| Module overheating | Exceeding current rating | Ensure the current per channel does not exceed 20mA. |
| No communication between devices | Ground not properly connected | Ensure a common ground connection between the module and connected devices. |
Can I use this module for unidirectional signals?
What happens if I connect the wrong voltage to VCC_L or VCC_H?
Can I use this module with a Raspberry Pi?
Is the optical isolation bidirectional?
The 4ch 3.3V 5V 12V 24V Digital Logic Level Converter Module with Optical Isolation is a powerful and versatile tool for interfacing devices with different logic levels. Its optical isolation feature ensures robust protection for sensitive components, making it ideal for a wide range of applications in embedded systems, industrial automation, and IoT projects. By following the usage instructions and best practices outlined in this documentation, you can effectively integrate this module into your projects and ensure reliable performance.