Hreyywo Mini Digital Oscilloscope DIY Kit STC8K8A Microcontroller Instruction Manual

1. Introduction

This instruction manual provides comprehensive guidance for the assembly and operation of the Hreyywo Mini Digital Oscilloscope DIY Kit. Designed around an STC8A8K microcontroller, this kit offers a simple yet functional oscilloscope for basic measurements. It is an excellent learning tool for electronics enthusiasts interested in understanding oscilloscope principles and practicing soldering skills.

2. Product Components

Before beginning assembly, please verify that all components listed below are present in your kit. The kit is shipped as disassembled parts.

Image: All components included in the Hreyywo Mini Digital Oscilloscope DIY Kit, laid out for inspection. This includes the main PCB, OLED display, microcontroller, various resistors, capacitors, connectors, rotary encoder, switches, and acrylic casing parts.

The kit includes:

• Main PCB (Printed Circuit Board)
• STC8A8K64S4A12 Microcontroller
• 0.96-inch OLED Display (128 x 64 resolution)
• Various resistors, capacitors, and diodes
• Rotary encoder with push-button functionality
• USB power port connector
• Toggle switch
• Input terminals
• Acrylic casing parts and fasteners
• Other small electronic components for assembly

3. Assembly Instructions

This kit requires soldering. Basic soldering skills are recommended. Please follow the circuit diagram and component placement carefully. Ensure correct orientation for polarized components such as diodes, electrolytic capacitors, and the microcontroller.

Image: Detailed circuit diagram (schematic) for the Mini Digital Oscilloscope, showing connections for the STC8K8A microcontroller, OLED display, USB power, input, and control components.

1. Prepare Workspace: Ensure a clean, well-lit, and ventilated area. Gather necessary tools: soldering iron, solder, desoldering wick/pump, wire cutters, tweezers, and safety glasses.
2. Identify Components: Match each component from the kit to its corresponding symbol and value on the PCB and schematic.
3. Solder Smallest Components First: Begin by soldering resistors, diodes, and small capacitors. Pay attention to polarity for diodes.
4. Solder IC Sockets (if applicable) or Microcontroller: If an IC socket is provided, solder it first. Otherwise, carefully solder the STC8A8K64S4A12 microcontroller, ensuring all pins are correctly aligned and no solder bridges occur.
5. Solder Larger Components: Proceed with larger components like the USB connector, toggle switch, input terminals, and the rotary encoder.
6. Connect OLED Display: Carefully connect the 0.96-inch OLED display to its designated header pins. Ensure correct orientation.
7. Assemble Casing: Once all electronic components are soldered and inspected, assemble the acrylic casing using the provided fasteners. This protects the circuit board.
8. Final Inspection: Visually inspect all solder joints for bridges, cold joints, or missing connections. Ensure no components are short-circuited.

Image: Top-down view of the fully assembled Hreyywo Mini Digital Oscilloscope, showing the OLED display, rotary encoder, and various connectors on the blue PCB.

4. Product Overview and Function Description

Familiarize yourself with the main components and their functions on the assembled oscilloscope board.

Image: Diagram illustrating the key functional parts of the Mini Digital Oscilloscope, including the pilot lamp, liquid crystal display screen (OLED), encoder knob key, USB power port, switch, and serial port.

• Pilot Lamp: Indicates power status or operational mode.
• Liquid Crystal Display Screen (OLED): 0.96-inch, 128x64 resolution display for waveform visualization and menu navigation.
• Encoder Knob Key: Used for navigating menus, adjusting parameters, and confirming selections (by pressing the knob).
• USB Power Port: Provides 4-5V operating voltage to the device.
• Switch: Power ON/OFF switch for the device.
• Serial Port: For potential data communication or firmware updates.
• Input Terminals: Where the signal to be measured is connected.

5. Operating Instructions

This section details how to power on the device, connect signals, and interpret the display.

Image: The assembled Mini Digital Oscilloscope powered via its USB port, showing a square wave on the OLED display, indicating active measurement.

5.1. Powering On

1. Connect a 4-5V power source to the USB power port.
2. Flip the power switch to the "ON" position. The OLED display should illuminate, and the pilot lamp should activate.

5.2. Connecting a Signal

1. Connect the signal source you wish to measure to the input terminals of the oscilloscope.
2. Ensure the signal voltage is within the device's specified range (0-30V).

5.3. Display and Controls

The 0.96-inch OLED display shows the waveform and various measurement parameters. The encoder knob is the primary control interface.

Image: Four examples of screen displays from the oscilloscope: a square wave, a sine wave, a triangular wave, and a menu showing Pulse Width Modulation (PWM) settings.

• Navigation: Rotate the encoder knob to scroll through menu options or adjust values.
• Selection/Confirmation: Press the encoder knob to select an option or confirm a setting.
• Time Base (Sec/Div): Adjustable settings include 500ms, 200ms, 100ms, 50ms, 20ms, 10ms, 5ms, 2ms, 1ms, 500us, 200us, 100us. Note that 100us is only available in auto-trigger mode.
• Voltage Range: The device supports a voltage range of 0-30V.
• Sampling Rate: 10kHz at 100us time base.
• Trigger Level: Adjustable voltage level for triggering.
• Trigger Slope: Select between rising edge (↑) or falling edge (↓) trigger.
• Trigger Mode:
  • A (Automatic Mode): Triggers automatically, even without a stable signal.
  • N (Normal Mode): Triggers only when the signal meets the trigger conditions.
  • S (Single Mode): Captures a single waveform when trigger conditions are met and then stops.

6. Specifications

7. Maintenance

Proper maintenance ensures the longevity and reliable operation of your Mini Digital Oscilloscope.

• Cleaning: Use a soft, dry cloth to clean the device. Avoid using liquids or abrasive cleaners, which can damage the display or electronic components.
• Storage: Store the oscilloscope in a dry, dust-free environment, away from direct sunlight and extreme temperatures.
• Handling: Handle the device with care to prevent physical damage, especially to the OLED display and input terminals.
• Power Supply: Always use a stable 4-5V power supply. Incorrect voltage can damage the microcontroller or other components.

8. Troubleshooting

If you encounter issues with your Mini Digital Oscilloscope, refer to the following common problems and solutions.

• Device Does Not Power On:
  • Check the USB power connection and ensure the power source is providing 4-5V.
  • Verify the power switch is in the "ON" position.
  • Inspect for any visible soldering errors or short circuits on the PCB.
• No Waveform Displayed:
  • Ensure a signal source is correctly connected to the input terminals.
  • Check the signal source itself to confirm it is generating a signal.
  • Adjust the time base and trigger settings. Try "Automatic Mode" (A) for triggering.
  • Verify the OLED display connection and functionality.
• Incorrect Waveform Display:
  • Check the input signal for noise or distortion.
  • Ensure the voltage range setting is appropriate for the input signal.
  • Re-examine soldering for any cold joints or poor connections, especially around the input stage.

9. Warranty and Support

As a DIY kit, this product is primarily intended for educational and hobbyist purposes. Due to the nature of self-assembly and soldering, specific warranties may vary. Please refer to the retailer's return policy for information regarding defective or incomplete kits upon receipt.

For technical support or inquiries regarding components, please contact the manufacturer Hreyywo or your point of purchase.