---
product_id: 222925280
title: "Ultrasonic Ranging Alarm Learn to Solder Electronics Kit for Soldering Practicing DIY Kit with HC-SR04 Ultrasonic Sensor Module"
brand: "aontoky"
price: "$47"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/222925280-ultrasonic-ranging-alarm-learn-to-solder-electronics-kit-for-soldering
store_origin: NZ
region: New Zealand
---

# 157.5" max range Dual power: AAA or USB Clear PCB for easy soldering Ultrasonic Ranging Alarm Learn to Solder Electronics Kit for Soldering Practicing DIY Kit with HC-SR04 Ultrasonic Sensor Module

**Brand:** aontoky
**Price:** $47
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your soldering game with smart sensing precision!

## Quick Answers

- **What is this?** Ultrasonic Ranging Alarm Learn to Solder Electronics Kit for Soldering Practicing DIY Kit with HC-SR04 Ultrasonic Sensor Module by aontoky
- **How much does it cost?** $47 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/222925280-ultrasonic-ranging-alarm-learn-to-solder-electronics-kit-for-soldering)

## Best For

- aontoky enthusiasts

## Why This Product

- Trusted aontoky brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete DIY Kit:** Includes everything from sensor to buzzer, empowering you to build and learn hands-on electronics.
- • **Flexible Power Options:** Choose between AAA batteries or USB power for ultimate convenience and portability.
- • **Customizable Alarm Distance:** Set your own alert range with simple button controls and never miss a critical measurement.
- • **Beginner-Friendly PCB Design:** Clearly labeled board ensures a smooth, frustration-free soldering experience.
- • **Precision Ultrasonic Sensing:** Measure distances up to 157.5" with pinpoint accuracy for your DIY projects.

## Overview

The Ultrasonic Ranging Alarm Kit combines the HC-SR04 sensor, buzzer, and STC89C52 microcontroller into a beginner-friendly DIY soldering project. It offers a wide measurement range of 1.96" to 157.5", dual power options (AAA battery or USB), and an easy-to-use alarm system with customizable distance settings. Perfect for millennial makers eager to sharpen their electronics skills with a practical, modular kit.

## Description

Ultrasonic Ranging Alarm Learn to Solder Electronics Kit for Soldering Practicing DIY Kit with HC-SR04 Ultrasonic Sensor Module

## Features

- 1. Ranging and Alarm Kit: Composes of a HC-SR04 ultrasonic Ranging sensor module, a buzzer and a STC89C25 chip(Programmed to use).
- 2. Easy to Solder: Clear symbols on the PCB board for simple welding provide a good experience of electronics soldering.
- 3. Two power supply options for choice: AAA battery or USB power supply. (a AAA battery case and a USB cable Included).
- 4. Easy to Setup: Press the +/- button to set the alarm distance and the buzzer will alarm loundly when measurment distance is less than the preset one.
- 5. Parameter: 4.5-5.5V DC. Measurement distance range: 1.96" - 157.5". Please go to "Product Information" section below for user guide if need..

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | AONTOKY |
| Style | Single |
| Power Source | Battery Powered |
| Color | red |
| Item Weight | 0.1 Kilograms |
| Alarm | Visual |
| Sensor Type | Ultrasonic |
| Material | Ceramic |
| Manufacturer | Funten |
| Part Number | FT-Urang |
| Item Weight | 3.52 ounces |
| Package Dimensions | 5.83 x 3.9 x 1.57 inches |
| Item model number | FT-Urang |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** AONTOKY
- **Style:** Single
- **Power Source:** Battery Powered
- **Color:** red
- **Item Weight:** 0.1 Kilograms
- **Alarm:** Visual
- **Sensor Type:** Ultrasonic
- **Material:** Ceramic
- **Manufacturer:** Funten

## Images

![Ultrasonic Ranging Alarm Learn to Solder Electronics Kit for Soldering Practicing DIY Kit with HC-SR04 Ultrasonic Sensor Module - Image 1](https://m.media-amazon.com/images/I/61V6Lj4oBLL.jpg)

## Questions & Answers

**Q: Where is parts list identifying parts so you know where to solder them on the pcb?  someone said "it is common", but where to find it?**
A: ABOUT 1/3 OF THE WAY DOWN and on the left hand side of the page on Amazon, right above the  RELATED PRODUCTS WITH FREE DELIVERY, you will see the USER GUIDE (PDF). That should help. Also the circuit board has printing on it showing what goes where.

**Q: My digital readout counter has 6 pins on the top row, but only 5 pins on the bottom row. is this the way it is supposed to be? or, is mine missing a p**
A: I can't find mine to compare but. Look at the PC board is there  a hole for that missing pin. 
Look at the readout for the signs of a broken pin,a stub .

**Q: Built using the battery option. Turns on, menu w/ controls, display and led working. Alarm doesnt activate consistent,often misfire. Advice please?**
A: Look for poor solder joints. If the soldering iron is not hot enough the connection may not be completely conducting properly. Sometimes by tapping on the board or the solder joints will make the connections work you can use this to identify which ones are bad.

**Q: Says it comes with 3 diodes, there is only 1 led in the pics (which is listed as 5mm red led). any idea what the 3 diodes are or if they're used?**
A: Just checked both circuit boards with a 10X loupe and I can’t find any other diodes other than the 5mm red LED, so I guess it’s a typo.
By the way, it’s a great kit!

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-11*