Gikfun 4-Digit LED Electronic Alarm Clock DIY Kit EK1985-US Instruction Manual

1. Introduktion

This manual provides detailed instructions for assembling and operating the Gikfun EK1985-US 4-Digit LED Electronic Alarm Clock DIY Kit. This kit is designed as a soldering practice and learning project, allowing users to build a functional digital clock that displays time, date, and temperature, with alarm and brightness adjustment features.

Figure 1: The fully assembled Gikfun 4-Digit LED Electronic Alarm Clock.

2. Säkerhetsinformation

Please read and understand all safety precautions before beginning assembly. This kit involves soldering, which requires careful handling of hot tools and electronic components.

• Always wear appropriate personal protective equipment, including safety glasses, when soldering.
• Arbeta i ett välventilerat utrymme för att undvika att andas in lödångor.
• Ensure your soldering iron is on a heat-resistant stand and unplugged when not in use.
• Undvik att vidröra lödkolvens heta spets.
• Keep a fire extinguisher or water nearby in case of accidental fire.
• Handle electronic components carefully to prevent damage from static electricity.
• Förvara små komponenter utom räckhåll för barn.

3. Paketets innehåll

Before starting assembly, verify that all components listed below are present in your kit. Refer to Figure 2 for a visual representation of the kit components and assembly steps.

Figur 2: Överview of the Gikfun EK1985-US DIY kit components and assembly steps.

3.1 Tools Needed (Not Included)

• Lödkolv
• Lödtråd
• Trådskärare
• Pincett
• Multimeter (for checking component values)
• Liten skruvmejsel

3.2 Komponentlista

4. Monteringsanvisningar

Follow these steps carefully to assemble your Gikfun 4-Digit LED Electronic Alarm Clock. Refer to Figure 2 for visual guidance during each step, and Figure 3 for detailed component identification.

1. Pre-check Components: Before soldering, check all part values and quantities against the component list. Use a multimeter to verify resistor values. Note that 10K resistors have no distinction between positive and negative poles.
2. Install Crystal Oscillator: Solder the crystal oscillator (32.768KHz) into its designated position on the circuit board.
3. Install Capacitors: Solder the two 22pF capacitors and the two 10uF capacitors. These components typically have no polarity unless marked otherwise (for electrolytic capacitors like 10uF, ensure correct polarity if present).
4. Montera batterihållaren: Solder the battery shrapnel (CR1220 battery holder) onto the board. Ensure correct orientation if applicable.
5. Install Buzzer: Solder the buzzer onto the circuit board. Pay attention to the positive (+) and negative (-) markings on the board and the buzzer for correct orientation.
6. Install IC Sockets: Solder the two 16-pin IC sockets onto the board. Pay attention to the notch or dot on each socket, aligning it with the corresponding marking on the circuit board.
7. Install Transistor: Solder the S8550 transistor. Align the semi-circular shape of the transistor with the semi-circular graphic on the board.
8. Install Tactile Switches and DC Socket: Solder the two tactile switches (UP and SET) and the DC005 power socket onto the board.
9. Install Photoresistor and Thermistor: Solder the photoresistor and thermistor. Leave a 1cm gap between the components and the circuit board during installation to allow for proper function and adjustment.
10. Weld Digital Tube Pins: Solder the pins of the 4-digit LED display onto the circuit board. Ensure all pins are securely connected.
11. Install ICs: Carefully insert the DS1302 IC and the STC8G1K17 MCU into their respective sockets. Ensure the notch or dot on each IC aligns with the notch on its socket and the marking on the board.
12. Install Circuit Board into Casing: Place the assembled circuit board into the acrylic shell. Connect the photoresistor and thermistor to their designated positions within the casing.
13. Säker Casing: Secure the acrylic casing with the provided screws. Tighten them gently to avoid cracking the acrylic.

Figure 3: Left: Detailed view of the circuit board with key components labeled. Right: External view of the clock with dimensions and labeled sensors/power input.

5. Kretsdiagram

For advanced users or troubleshooting, the circuit diagram provides a detailed schematic of the Gikfun EK1985-US clock. This diagram illustrates the connections between the microcontroller (MCU), real-time clock (DS1302), LED display, sensors, and input buttons.

Figure 4: Complete circuit diagram for the Gikfun EK1985-US electronic clock.

6. Bruksanvisning

Once assembled, connect the clock to a 5V DC power supply using the provided USB cable. The clock will power on and display the current time. The clock features two setting switches: "UP" and "SET" (refer to Figure 3, right image, for location).

6.1 Visningslägen

The clock cycles through different display modes automatically:

• Tidsvisning: Shows the current time (e.g., 12:30). Includes PM indicator for 12-hour format.
• Datumvisning: Shows the current date (year, month, day, week).
• Temperaturvisning: Shows the ambient temperature in real-time.

6.2 Ställa in tid och datum

1. Tryck på UPPSÄTTNING tryck en gång på knappen för att gå in i tidsinställningsläget. Timsiffrorna blinkar.
2. Använd UP knappen för att justera timmen.
3. Trycka UPPSÄTTNING igen för att gå till minutinställning. Använd UP för att justera minuter.
4. Fortsätt att trycka UPPSÄTTNING to cycle through setting year, month, day, and week, adjusting each with the UP knapp.
5. After setting the week, press UPPSÄTTNING one more time to exit setting mode and save changes.

6.3 Väckarklocka Funktion

The clock includes an alarm function with four adjustable music options.

1. För att ställa in alarmet, tryck och håll nere UPPSÄTTNING button for approximately 3 seconds. The alarm hour digits will flash.
2. Använd UP knappen för att justera alarmtiden.
3. Trycka UPPSÄTTNING igen för att gå till inställning av larmminuter. Använd UP för att justera minuter.
4. Trycka UPPSÄTTNING again to select the alarm music (1-4). Use UP to cycle through music options.
5. Trycka UPPSÄTTNING one more time to exit alarm setting mode.
6. To turn the alarm on or off, a quick press of the UP button (outside of setting mode) will toggle the alarm status. An indicator on the display may show if the alarm is active.

6.4 Justering av ljusstyrka

The clock features both automatic and manual brightness adjustment.

• Automatisk justering: The built-in photoresistor (light sensor) automatically adjusts the display brightness based on ambient light conditions.
• Manuell justering: While in normal time display mode, a short press of the UPPSÄTTNING button (not held) will cycle through manual brightness levels.

6.5 Temperaturkalibrering

For the first use, or if temperature readings appear inaccurate, calibration may be necessary.

1. Enter temperature display mode (the clock cycles to it automatically).
2. Tryck och håll båda UP och UPPSÄTTNING buttons simultaneously for approximately 3 seconds to enter temperature calibration mode. The temperature display will flash.
3. Använd UP button to adjust the temperature offset. Compare with a known accurate thermometer.
4. Trycka UPPSÄTTNING to save the calibration and exit the mode.

7. Specifikationer

• Modell: EK1985-US
• Visa: Fyrsiffrig LED
• Funktioner: Time (12/24-hour), Date (Year, Month, Day, Week), Temperature, Alarm Clock with 4 melodies, Power-off memory.
• Ljusstyrka: Automatic adjustment via photoresistor, manual adjustment.
• Strömförsörjning: 5V DC (via USB cable)
• Backup-batteri: CR1220 (for time memory during power loss)
• Mått (monterad): Approximately 11.5 cm (4.52 in) x 4 cm (1.57 in) x 3.2 cm (1.25 in)
• Tillverkare: Gikfun

8. Felsökning

• Clock does not power on:
  • Ensure the 5V DC power supply is connected correctly and functioning.
  • Check all solder joints for cold joints or bridges.
  • Verify the DC socket is properly soldered.
• Incorrect time/date display:
  • Ensure the DS1302 IC is correctly inserted into its socket and oriented properly.
  • Verify the crystal oscillator is correctly soldered.
  • Check the CR1220 button battery for proper installation and charge. A missing or dead battery can affect timekeeping during power outages.
  • Follow the operating instructions to set the time and date accurately.
• Temperaturavläsningen är felaktig:
  • Ensure the thermistor is correctly soldered and not damaged.
  • Perform temperature calibration as described in the operating instructions.
• Skärmen är för svag eller för ljus:
  • Check the photoresistor for correct soldering and ensure it is not obstructed.
  • Adjust brightness manually using the SET button as described in the operating instructions.
• Knapparna svarar inte:
  • Verify the tactile switches are correctly soldered and not shorted.
  • Ensure the MCU (STC8G1K17) is correctly inserted and oriented.
• Larmet ljuder inte:
  • Ensure the buzzer is correctly soldered with the correct polarity.
  • Verify the alarm is enabled (check display indicator) and set to the correct time.

9. Garanti och support

This Gikfun DIY kit is intended as a learning project. Due to the nature of DIY assembly and soldering, specific warranties may vary. For technical support, component inquiries, or further assistance, please contact Gikfun directly through their official channels or the retailer where the product was purchased.

For more information about Gikfun products, visit the official Gikfun store: Gikfun Store on Amazon.