Custom PCB Design: Electronic Development with LCD Display

Developing custom PCBs is at the heart of our expertise. For this project, we created a fully integrated control board with an LCD display for industrial applications.

Project requirements

Our customer required a compact, reliable control unit with the following specifications:

• Compact designMaximum dimensions 100x80mm
• LCD integration.8″ TFT display for user interface
• RobustnessIndustrial suitability to IP65
• ConnectivityRS485, CAN bus, Ethernet
• power supply-24V DC wide-range input

Design process

Circuit design

• MicrocontrollerSTM32F4 series for high performance
• Display controllerIntegrated TFT Controller
• CommunicationMulti-interface design
• Protective circuitsESD protection and overvoltage protection

Layout optimization

Layer-Stack (4-Layer PCB):
- Top Layer: Komponenten und Signale
- Ground Plane: Durchgehende Massefläche
- Power Plane: Stromversorgung
- Bottom Layer: Routing und Komponenten

Thermal management

• Copper areas for heat dissipation
• Thermal vias under critical components
• Optimized component placement

Production process

PCB manufacturing

• materialFR4 High-Tg
• Surface finishLead-free HASL
• Via TechnologyMicro-vias for dense layouts
• Solder maskGreen, matte

Assembly

• SMD components402 up to BGA
• Automatic assemblyPick and Place
• Reflow solderingOptimized temperature profiles
• Quality ControlAOI and In-Circuit Testing

software integration

Embedded Firmware

// LCD Initialisierung
void LCD_Init(void) {
    // SPI Interface konfigurieren
    HAL_SPI_Init(&hspi1);
    
    // Display Reset
    HAL_GPIO_WritePin(LCD_RST_GPIO_Port, LCD_RST_Pin, GPIO_PIN_RESET);
    HAL_Delay(100);
    HAL_GPIO_WritePin(LCD_RST_GPIO_Port, LCD_RST_Pin, GPIO_PIN_SET);
    
    // Initialisierungssequenz
    LCD_WriteCommand(0x01); // Software Reset
    HAL_Delay(120);
}

User interface

• Touch InterfaceCapacitive touch detection
• Menu structureHierarchical navigation
• data visualizationReal-time graphics
• MultilingualismGerman/English

Testing and validation

Functional Test

• Electrical testingKontinuität, Isolation
• Functional testsAll interfaces
• Environmental testsTemperature, Humidity
• EMV testsCE compliance

long-term testing

• 000-hour endurance test at 85°C
• Vibration testing according to IEC 60068
• Temperature cycles from -40°C to +85°C

results

The final PCB meets all requirements:

• Size5x75mm (5% below specification)
• power consumption.1W (15% under budget)
• MTBF>50,000 hours under industrial conditions
• production costs0% below target costs

Application areas

This PCB technology is ideal for:

• industrielle SteuerungenPLC-Erweiterungen
• Measurement technologyTragbare Messgeräte
• AutomotivePrüfstände und Diagnostik
• Medical TechnologyPatientenüberwachung

Conclusion

Durch enge Zusammenarbeit zwischen Hardware- und Softwareentwicklung konnten wir eine optimale Lösung realisieren. Die Kombination aus modernen Design-Tools und bewährten Fertigungsprozessen gewährleistet höchste Qualität und Zuverlässigkeit.

Benötigst du eine maßgeschneiderte PCB-Lösung? Wir begleiten dich von der Idee bis zur Serienproduktion!