Attributes

Brand	-
Category	Electronic Components / Maker DIY / Development Boards & Control Boards
Origin	-
Microcontroller Model	STC89C52RC (8051 Core)
Voltage Input Range	0V to 30V DC
Communication Interface	UART / Bluetooth HC-05 Module
Display Type	1602 LCD Screen with Backlight
Power Supply	5V via USB or 9V Battery Clip
PCB Dimensions	85mm x 55mm x 15mm
ADC Resolution	10-bit Successive Approximation
Measurement Channels	4 Independent Analog Channels
Programming Port	ISP Download Header (5-pin)
Package Material	FR-4 PCB and ABS Plastic Case

5 reviews

Anonymous

Mar 18, 2026

Rating: 5/5

Great Learning Tool

This kit is perfect for understanding how digital voltmeters work. The schematic is clear and the Bluetooth feature adds a modern touch.

Anonymous

Mar 07, 2026

Rating: 4/5

Solid hardware quality

PCB traces are well done. Instructions could be more detailed regarding the code upload process, but overall a good purchase.

Anonymous

Feb 04, 2026

Rating: 5/5

Perfect for students

Bought this for my electronics club. The multi-channel support allows us to measure multiple points in a circuit simultaneously.

Anonymous

Jan 31, 2026

Rating: 5/5

Bluetooth works well

Connected to my phone immediately using a generic UART app. Very convenient to log data wirelessly during experiments.

Anonymous

Jan 25, 2026

Rating: 4/5

Good but tricky calibration

Hardware quality is solid. Calibration required some patience using the potentiometer, but once set, readings are accurate.

5 FAQ

Q: What Bluetooth app do you recommend?

A: Any generic Serial Bluetooth Terminal app available on iOS or Android stores will work with the HC-05 module.

Q: Can it measure AC voltage?

A: No, this design is specifically calibrated for DC voltage measurement only. Measuring AC may damage the board.

Q: What is the maximum current this board can handle?

A: This is a voltage measurement device with high input impedance. It is not designed to measure or pass significant current.

Q: Is soldering required for assembly?

A: Yes, this is a DIY kit. You will need a soldering iron and basic tools to assemble the components onto the PCB.

Q: Does this kit come with the source code?

A: Yes, a QR code is provided in the manual to download the C language source code and schematic diagrams.

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