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Learn to Solder - DIY Ultrasonic Ranging Electronic Kit
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A DIY soldering kit that builds into a functional ultrasonic distance meter. Using an HC-SR04 ultrasonic sensor, STC89C52 microcontroller, and 3-digit 7-segm...
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A DIY soldering kit that builds into a functional ultrasonic distance meter. Using an HC-SR04 ultrasonic sensor, STC89C52 microcontroller, and 3-digit 7-segment display, this kit measures distances from 5cm to 4m with a built-in buzzer alarm when objects get too close.
The microcontroller comes pre-programmed, so once assembled the device is ready to use. Set your distance threshold using the onboard buttons – the buzzer sounds when objects are closer than your set value. Settings are retained after power-off.
Key Features
- 5cm to 4m Range – Accurate ultrasonic distance measurement displayed on 7-segment LED
- Adjustable Alarm – Set a distance threshold; buzzer alerts when objects are closer
- Pre-Programmed MCU – STC89C52 microcontroller comes ready to run
- Button Controls – Adjust settings with +, -, and Set buttons
- Memory Retention – Alarm settings saved after power-off
- USB or Battery Power – Includes both USB cable and battery holder
Ideal For
- Learning through-hole soldering with a functional result
- Understanding microcontroller-based sensor projects
- DIY parking sensors and proximity alarms
- STEM education and electronics workshops
Note: This is a soldering kit – assembly required. Soldering iron and solder not included.
Specifications
- Measurement Range – 5cm to 4m
- Display – 0.56" 3-digit 7-segment LED
- Microcontroller – STC89C52 (pre-programmed)
- Sensor – HC-SR04 ultrasonic module
- Input Voltage – DC 4.5–5.5V
- PCB Size – 60 × 70mm
- Assembled Size – ~60 × 90 × 30mm (with sensor)
- Weight – 80g
Kit Contents
- 1× PCB
- 1× HC-SR04 Ultrasonic Sensor Module
- 1× 0.56" 3-digit 7-segment Display
- 1× STC89C52 Microcontroller (pre-programmed)
- 1× 40-pin IC Socket
- 1× 12MHz Crystal Oscillator
- 1× 5V Active Buzzer
- 1× 5mm Red LED
- 3× Tactile Buttons (6×6×12mm)
- 1× Power Switch with Cap
- 1× DC005 Power Jack
- 1× USB to DC Power Cable
- 1× 3×AA Battery Holder
- 4× 9012 Transistors
- 9× 1KΩ Resistors
- 7× 4.7KΩ Resistors
- 3× 22pF Ceramic Capacitors
- 1× 10µF Electrolytic Capacitor
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- electrolytic capacitor
- An electrolytic capacitor is a type of capacitor that can store relatively large amounts of electrical charge in a small package. It is commonly used for smoothing power supplies, reducing noise, and short-term energy storage, but it usually has polarity so it must be installed the correct way around.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- SR04 ultrasonic module
- An SR04 ultrasonic module is a distance sensor that sends out a short sound pulse and measures the echo returning from an object. It matters because it lets a robot detect obstacles or measure distance without touching anything.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
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