Introduction
This manual provides comprehensive instructions for the setup, operation, maintenance, and troubleshooting of the SIMAIR SMH1602-U 16x2 Character LCD Module. This module is designed for displaying alphanumeric characters and symbols, making it suitable for a wide range of embedded applications. Please read this manual thoroughly before using the product to ensure proper functionality and longevity.
Specifications
The SMH1602-U is a 16x2 character LCD module with a built-in AIP31066L controller, offering both UART and RS232 serial interfaces for flexible integration.
| Feature | Description |
|---|---|
| Model Number | SMH1602-U |
| Module Size (LxWxH) | 80.0 x 36.0 x 12.1 mm |
| View Area (WxH) | 64.5 x 16.0 mm |
| Character Size (WxH) | 3.25 x 6.03 mm |
| Character Pitch (WxH) | 3.664 x 3.25 mm |
| Interface | UART (9600bps) / RS232 |
| View Direction | 6 O'clock |
| LCD Mode | STN (Blue), FSTN (Gray-white) |
| Operating Voltage | 3.3V / 5V |
| Driver IC | AIP31066 or Equivalent |
| Net Weight | 25g |
| Driving Method | 1/16 DUTY, 1/5 BIAS |
| Number of Characters | 16 characters x 2 lines |
| Operating Temperature | -20℃ ~ +70℃ |
| Storage Temperature | -30℃ ~ +80℃ |
The external dimensions of the module are provided in the diagram below:
Image: Diagram illustrating the external dimensions (length, width, height) and pin spacing of the SMH1602-U module.
Setup and Connection
The SMH1602-U module supports both UART and RS232 serial interfaces. Ensure correct pin connections for proper operation. The module can operate with either 3.3V or 5V power supply.
Pin Descriptions (CON1/CON2)
| Pin No. | Symbol | Level | Function |
|---|---|---|---|
| 1 | VSS | 0V | Ground |
| 2 | VDD | +5.0V | Supply Voltage |
| 3 | TXD | H/L | UART: serial data output |
| 4 | RXD | H/L | UART: serial data input (full duplex communication) |
A visual representation of the pinout is shown below:
Image: Diagram illustrating the pin numbers, symbols, voltage levels, and functions for the SMH1602-U module.
Power Supply
The module can be powered by either 3.3V or 5V. Ensure the correct voltage is supplied to the VDD pin (Pin 2) and VSS (Pin 1) is connected to ground.
Interface Selection
The module supports UART and RS232 interfaces. The specific interface used will depend on the model variant purchased (e.g., "Yellow 5V UART" or "Blue 5V RS232"). Connect the TXD (Pin 3) and RXD (Pin 4) pins to your microcontroller or serial communication device accordingly.
Operating Instructions
Once the module is correctly wired and powered, you can begin sending commands and data via the selected serial interface (UART or RS232) to display characters.
Default Settings
- Baud Rate: 9600bps (for UART interface)
- Contrast Setting: Default (03)
- Backlight Setting: Default (04)
These settings can typically be adjusted via serial commands sent to the module, depending on the specific firmware and controller capabilities. Refer to the detailed development data and technical support provided by the manufacturer for specific command protocols.
Displaying Characters
To display characters, send the ASCII values of the characters over the serial interface. The module will automatically arrange them on the 16x2 display. Commands for cursor positioning, clearing the screen, and other display functions are usually available through specific byte sequences. Consult the technical documentation for a complete list of commands.
Maintenance
To ensure the longevity and optimal performance of your SMH1602-U LCD module, follow these maintenance guidelines:
- Cleaning: Gently wipe the display surface with a soft, lint-free cloth. Avoid using abrasive cleaners, solvents, or excessive pressure, as these can damage the screen.
- Handling: Always handle the module by its edges. Avoid touching the display area or the exposed electronic components on the PCB. Static electricity can damage sensitive components, so use anti-static precautions when handling.
- Environmental Conditions: Operate and store the module within the specified temperature ranges:
- Operating Temperature: -20℃ to +70℃
- Storage Temperature: -30℃ to +80℃
- Power Supply: Ensure a stable and correct voltage (3.3V or 5V) is supplied. Incorrect voltage can lead to damage.
Troubleshooting
If you encounter issues with your SMH1602-U module, consider the following common troubleshooting steps:
- No Display/Blank Screen:
- Verify power connections (VDD and VSS) and ensure the correct voltage (3.3V or 5V) is applied.
- Check the backlight connection and ensure it is receiving power.
- Confirm the contrast setting. A very high or very low contrast can make the display appear blank.
- Garbled Characters:
- Ensure the correct baud rate (default 9600bps for UART) is set on both the module and your transmitting device.
- Check serial data connections (TXD, RXD) for proper wiring and continuity.
- Verify that the data format (e.g., 8N1) matches between the module and your device.
- Partial Display/Missing Pixels:
- Inspect the module for any physical damage or loose connections.
- Ensure the operating temperature is within the specified range.
- Module Not Responding:
- Power cycle the module.
- Recheck all wiring connections.
- Ensure your control code is sending valid commands and data.
If these steps do not resolve the issue, please contact technical support for further assistance.
User Tips
- Development Data: The manufacturer can provide detailed development data and technical support. It is highly recommended to utilize these resources for advanced programming and integration.
- Customization: For large quantities, customization options are available, including different font libraries (e.g., Russian, British, European) beyond the default English and Japanese. Contact the manufacturer for details on MOQ and customization processes.
- Compatibility: This module is compatible in size with SMH1602-A, which can be useful for existing projects or enclosures.
Warranty and Support
The SMH1602-U LCD module comes with a 1-year warranty from the date of purchase. Additionally, SIMAIR provides lifetime technical support service for this product.
For technical assistance, troubleshooting beyond the scope of this manual, or warranty claims, please contact SIMAIR customer support. When contacting support, please have your product model number (SMH1602-U) and a detailed description of the issue ready.
