{"title":"Learn to Solder - DIY Ultrasonic Ranging Electronic Kit","handle":"learn-to-solder-diy-ultrasonic-ranging-electronic-kit","url":"/products/learn-to-solder-diy-ultrasonic-ranging-electronic-kit","description":"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.\n\nThe 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.\n\nKey Features\n\n\n5cm to 4m Range – Accurate ultrasonic distance measurement displayed on 7-segment LED\n\nAdjustable Alarm – Set a distance threshold; buzzer alerts when objects are closer\n\nPre-Programmed MCU – STC89C52 microcontroller comes ready to run\n\nButton Controls – Adjust settings with +, -, and Set buttons\n\nMemory Retention – Alarm settings saved after power-off\n\nUSB or Battery Power – Includes both USB cable and battery holder\n\n\nIdeal For\n\nLearning through-hole soldering with a functional result\nUnderstanding microcontroller-based sensor projects\nDIY parking sensors and proximity alarms\nSTEM education and electronics workshops\n\n\n\nNote: This is a soldering kit – assembly required. Soldering iron and solder not included.\n\n\nSpecifications\n\n\nMeasurement Range – 5cm to 4m\n\nDisplay – 0.56\" 3-digit 7-segment LED\n\nMicrocontroller – STC89C52 (pre-programmed)\n\nSensor – HC-SR04 ultrasonic module\n\nInput Voltage – DC 4.5–5.5V\n\nPCB Size – 60 × 70mm\n\nAssembled Size – ~60 × 90 × 30mm (with sensor)\n\nWeight – 80g\n\n\nKit Contents\n\n1× PCB\n1× HC-SR04 Ultrasonic Sensor Module\n1× 0.56\" 3-digit 7-segment Display\n1× STC89C52 Microcontroller (pre-programmed)\n1× 40-pin IC Socket\n1× 12MHz Crystal Oscillator\n1× 5V Active Buzzer\n1× 5mm Red LED\n3× Tactile Buttons (6×6×12mm)\n1× Power Switch with Cap\n1× DC005 Power Jack\n1× USB to DC Power Cable\n1× 3×AA Battery Holder\n4× 9012 Transistors\n9× 1KΩ Resistors\n7× 4.7KΩ Resistors\n3× 22pF Ceramic Capacitors\n1× 10µF Electrolytic Capacitor\n","vendor":"Little Bird","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":70,"title":"Default Title","sku":"LB-LS6569","price":12.55,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":144,"option1":"Default Title"}]}