1. Introduction
This instruction manual provides detailed guidance for assembling, operating, and maintaining your Light Controlled LED Clock DIY Kit (Model TJ-56-262). This kit is designed for enthusiasts interested in electronics and soldering practice, featuring a 51 Microcontroller-based electronic clock with a unique four-position rotating LED display.
The assembled clock offers several functionalities including automatic brightness adjustment, alternating display of time and temperature, an alarm clock, and power-off memory to retain settings.
2. Specifications
| Feature | Description |
|---|---|
| Product Model | TJ-56-262 |
| Type | Electronic Clock DIY Kit |
| Origin | Mainland China |
| Condition | New |
| PCB Board Size | Length: 81mm, Width: 81mm |
| Working Voltage | 5V (via mobile phone charger, power bank, or USB port) |
| Main Functions | Automatic brightness adjustment, alternating time/temperature display, alarm clock, power-off memory |
| Package Dimensions | 14cm (L) x 8cm (W) x 9cm (H) |
| Package Weight | 0.18 kg |
3. Package Contents
The standard kit includes the following components. Please verify all parts are present before beginning assembly. Note that an acrylic casing may be included depending on the specific kit version purchased (e.g., "kit with shell" or "kit wire shell").
- PCB Board (81mm x 81mm)
- 4-Digit 7-Segment Display
- STC Single Chip Microcontroller (pre-programmed)
- Resistors (various values)
- Capacitors (various values)
- Transistors
- Red and Blue Dual-Color LEDs (for circular display)
- Clock Crystal Oscillator
- Buzzer (for alarm)
- USB Power Interface
- Battery Holder (for power-off memory, typically for a CR1220 battery)
- Photosensitive Resistor (for automatic brightness)
- Thermistor (for temperature display)
- Touch Switches (S1, S2)
- USB Power Cable
- Acrylic Casing (optional, depending on kit version)
4. Assembly Instructions
This kit requires soldering. Basic soldering skills and tools (soldering iron, solder, wire cutters, multimeter) are necessary. Please follow these steps carefully:
4.1 Component Identification
Before soldering, identify all components using the provided circuit diagram and the labeled PCB image. Pay close attention to component values (resistors, capacitors) and polarity (LEDs, diodes, ICs).
4.2 Soldering Components
- Resistors and Diodes: Start with the smallest components. Solder all resistors and diodes (including the photosensitive resistor and thermistor) to their designated positions on the PCB. Ensure correct polarity for diodes and LEDs.
- Capacitors and Crystal Oscillator: Solder the capacitors and the clock crystal oscillator. Note polarity for electrolytic capacitors if present.
- IC Sockets: Solder the IC sockets for the STC microcontroller and any other ICs. This allows for easy replacement of ICs if needed.
- STC Microcontroller: Carefully insert the pre-programmed STC microcontroller into its socket, ensuring correct orientation (notch aligns with the notch on the socket/PCB).
- 4-Digit 7-Segment Display: Solder the 4-digit 7-segment display.
- LEDs: Solder the red and blue dual-color LEDs around the circular pattern. Ensure correct polarity for each LED.
- Buzzer and Touch Switches: Solder the buzzer and the two touch switches (S1 and S2).
- USB Power Interface: Solder the USB power interface.
- Battery Holder: Solder the battery holder for the power-off memory. Insert a CR1220 battery (not typically included) into the holder, observing polarity.
4.3 Circuit Diagram Reference
Refer to the circuit diagram for detailed connections and component values during assembly:
4.4 Casing Assembly (If Included)
If your kit includes an acrylic casing, carefully peel off any protective films from the acrylic pieces. Assemble the casing around the PCB, securing it with the provided screws and standoffs. Do not overtighten.
5. Setup and Initial Power-On
- Power Connection: Connect the provided USB cable to the clock's USB power interface and plug the other end into a 5V USB power source (e.g., phone charger, power bank, computer USB port).
- Initial Display: Upon successful power-on, the clock should display the current time (default). If the display is blank or erratic, refer to the Troubleshooting section.
- Battery for Power-Off Memory: Ensure a CR1220 battery is installed in the battery holder with correct polarity to enable power-off memory.
6. Operating Instructions
The clock is operated using the two touch switches, S1 and S2.
6.1 Display Modes
- Time Display (Default): The clock continuously displays the time.
- Date/Week/Year Display: Briefly press S2 to cycle through: Date → Day of the Week → Year. Pressing S2 again after Year will return to Date.
- Temperature/Alarm Time Display: Briefly press S1 to cycle through: Temperature → Alarm Clock Time. Pressing S1 again after Alarm Clock Time will return to Temperature.
6.2 Circular LED Display Modes
To change the display mode of the circular LEDs:
- Switch Mode: Briefly press and hold both S1 and S2 simultaneously. The clock will cycle through 6 different circular LED display patterns. Release the buttons when your desired mode is shown.
6.3 Setting Mode (Time, Date, Alarm)
To enter the setting mode for time, date, and alarm:
- Enter Setting Mode: Press and hold both S1 and S2 simultaneously for more than 3 seconds. The 4-digit display will show "Fu-1", indicating Function 1.
- Select Function: Briefly press S1 to cycle through the functions:
- Fu-1: Set Time
- Fu-2: Set Date
- Fu-3: Set Alarm Clock Time
- Fu-4: Set Hour (This might be a sub-function or a separate setting for a specific hour format, but the description is ambiguous. Assume it's part of setting time/alarm.)
- Fu-5: Set Minute (Similar to Fu-4, assume it's part of setting time/alarm.)
- Enter Selected Function: Once the desired function (e.g., "Fu-1" for Set Time) is displayed, briefly press S2 to enter that function.
- Adjust Values: Inside a function, a digit will be flashing.
- Briefly press S1 to increase the value of the flashing digit.
- Briefly press S2 to move to the next digit.
- Save and Exit: After adjusting all digits in a function, press S2 again to save the settings and exit the setting mode.
Alarm Clock Specifics:
- When setting the alarm clock time (Fu-3), if you set the hour digit to 24 and save it, the alarm clock function will be turned off.
6.4 Demonstration Video
Watch this video to see the clock's various display modes and functionalities in action:
7. Maintenance
- Cleaning: Gently wipe the acrylic casing and PCB with a dry, soft cloth. Avoid using liquid cleaners directly on electronic components.
- Power Supply: Always use a stable 5V USB power source. Unstable power can affect clock accuracy or damage components.
- Battery Replacement: The CR1220 battery for power-off memory typically lasts several years. If the clock loses time or settings after being unplugged, the battery may need replacement. Carefully open the casing (if applicable) and replace the battery, observing polarity.
- Environmental Conditions: Keep the clock in a dry environment, away from direct sunlight, extreme temperatures, and high humidity to ensure longevity.
8. Troubleshooting
- Clock does not power on / No display:
- Check the USB power connection. Ensure the 5V power source is functional.
- Inspect all soldered joints on the PCB for cold joints, bridges, or unsoldered pins.
- Verify the STC microcontroller is correctly seated in its socket and oriented properly.
- Incorrect Time/Date:
- Enter the setting mode (hold S1+S2 for >3s) and re-adjust the time and date as described in Section 6.3.
- Ensure the CR1220 battery is installed and functional for power-off memory.
- Some LEDs are not lighting up:
- Check the soldering for the specific non-functional LEDs.
- Verify the polarity of the LEDs.
- Alarm not working:
- Check the alarm setting in Function 3. Ensure the hour is not set to 24, as this disables the alarm.
- Verify the buzzer is correctly soldered and functional.
- Automatic brightness adjustment not working:
- Ensure the photosensitive resistor is correctly soldered and exposed to ambient light. It should not be covered.
- Temperature display is inaccurate:
- Verify the thermistor is correctly soldered and not obstructed or in an area with localized heat.
9. User Tips
- Double-Check Soldering: As this is a DIY kit, the most common issues arise from soldering errors. Always double-check your solder joints for continuity and shorts.
- Component Orientation: Pay extra attention to the orientation of polarized components like LEDs, diodes, and integrated circuits (ICs). Incorrect orientation can prevent the circuit from working or damage components.
- Test in Stages: If possible, test the circuit in stages (e.g., power supply, microcontroller, display) to isolate any issues early in the assembly process.
10. Warranty and Support
For any questions, technical assistance, or issues with your Light Controlled LED Clock DIY Kit, please contact the seller, Electronic Maker Store, through the platform where you made your purchase. Provide your order details and a clear description of the problem for efficient support.
