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Product Description
| Brand | Unbranded |
|---|---|
| Type | DIY Kit |
| Operating voltage | DC 3V-6V |
Description:
4bits digital clock is a fun electronic soldering DIY kit. It’s equipped with the 0.56" 4 digits LED. It is great for you to train electronic knowledge and soldering skills during assembling components. Once finished, it will be a digital alarm clock with seconds correction, hourly chime function and so on. It is very perfect for soldering project and school electronics learning.
- Warm Tip: Clock DIY kits are 24-hour display format, accurate travel time, the error range ±1 sec every 24 hours, supporting seconds correction, hourly chime function and twice alarm clock setting.
Schematic as below picture.
Principle
- The whole system by MCU minimum system, key input circuit, display circuit, buzzer circuit, and power supply parts.
- 1>. MCU minimum system: including the U1 (STC11F02E), C1, R1 for power-on reset circuit. The clock circuit is composed of C2, C3, and Y1.
- 2>. The pressed key input circuit: composed of S1, S2, short press the button once a loud buzzer rang, long-press the button once two loud buzzers rang.
- 3>. The display circuit: 4bits common cathode and on PR1 Resisters Packs.
- 4>. Buzzer circuit: composed of Q1, R2, and LS1, short press the button once a loud buzzer rang, long-press the button once two loud buzzers rang.
- 5>. J1 is a 5v power supply input terminal, C4 filtering.
- Notice please: there is the direction for PR1 Resisters Packs, there is one side of the word in the direction of the MCU.
Installation Steps:
- Step 1: Install 2pcs Resistor, 3pcs ceramic capacitor, 1pcs Crystal Oscillator.
- Step 2: Install 1pcs Network Resistor. Pay attention to the installation direction.
- Step 3: Install the IC Socket. But pay attention to the installation direction.
- Step 4: Install the 2pcs button. But pay attention to the installation direction. Install 1pcs S8850.
- Step 5: Install 1pcs Power socket; 1pcs Electrolytic Capacitor; 1pcs Buzzer.
- Step 6: Install 4Bit Digital Tube and IC. And then test!
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