A
Anonymous
Mar 26, 2026
Rating: 5/5
Easy to Use
Plenty of code examples online for 51 MCU. Very beginner friendly.
Description
HC-SR04 Ultrasonic Module, Supports 51/STM32
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Operating Voltage | DC 5V |
| Static Current | < 2mA |
| Operating Frequency | 40kHz |
| Measuring Range | 2cm - 400cm |
| Measuring Angle | 15 degrees |
| Trigger Input Signal | 10uS TTL pulse |
| Echo Output Signal | TTL level signal |
| Product Size | 45mm x 20mm x 15mm |
| Connection Interface | 4-Pin Header |
| Supported MCU | 51, STM32, Arduino, AVR |
5 reviews
A
Anonymous
Mar 14, 2026
Rating: 4/5
Good Value
Works well but needs stable voltage. Had to add a capacitor to smooth readings.
A
Anonymous
Mar 07, 2026
Rating: 5/5
Great Sensor
Works perfectly with my STM32 board. Accurate readings within expected range.
A
Anonymous
Feb 12, 2026
Rating: 3/5
Okay for price
Range is limited indoors with obstacles. Good for simple projects only.
A
Anonymous
Feb 03, 2026
Rating: 5/5
Fast Shipping
Item arrived quickly and works as described. Packaging was secure.
5 FAQ
Q: What is the maximum practical range?
A: While rated for 400cm, 250cm is more reliable in standard indoor conditions.
Q: What is the pinout order?
A: From left to right: VCC, Trigger, Echo, and GND.
Q: Is this module compatible with 3.3V logic?
A: The VCC is 5V. The echo output is 5V TTL, so use a voltage divider for 3.3V MCUs.
Q: Does this come with a library?
A: No, but code examples are provided in the product description download link.
Q: Is this sensor waterproof?
A: No, this is an indoor electronic component and should not be exposed to water.
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