LM2596 LED Voltmeter DC-DC Step-Down Module (LM2596S) [B165]


* Specs

With a voltage meter and voltmeter displays self-calibration. Uses a more advanced microprocessor voltage voltmeter error ± 0.05V, Range 0 ~ 40V. (To ensure accuracy voltmeter, make sure the input voltage of 4.5V and above)

Touch of a button to switch the input or output voltage measurements and has a light show which is being measured voltages, and save the settings, even the power off and then on.

Voltmeter can be turned off when not needed touch of a button you can easily achieve the left.

With terminals, no soldering iron can also be easy to use, and to retain bond wire connection points.

Input Voltage 4.0 ~ 40V. (Input voltage must be higher than the output voltage of 1.5v or more)

Adjustable output voltage range of 1.25V ~ 37V continuously adjustable. (Input voltage must be higher than the output voltage of 1.5V)

Output current 3A, recommendations within 2.0A use, high current needed to enhance heat dissipation.

Output power 20W, 15W, please enhance heat dissipation over.

High conversion efficiency, on average 88% (efficiency and the input and output voltage, current, pressure related)

With reverse polarity protection, reverse polarity does not burn

Size 6.1 * 3.4 * 12cm (L * W * H)

Weight: 22g

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B25 Voltage Sensor DC0~25V [B125]


* GitHubhttps://github.com/rdiot/rdiot-b125.git

* Specs

Voltage input: DC0-25V

Voltage detection range:DC0.02445V-25V

Voltage analog resolution:0.00489V

* Contents

- Connect

GND ----- GND

VCC ----- X

S ----- A1 

- Key Code

#include <Wire.h>

float val11; 

float val2;

void setup() 





 Serial.println("Voltage: ");   


void loop() 


 float temp;       



 Serial.print("analog:"+(String)val11+", "+(String)val11+"/4.092="+(String)temp);



 Serial.println(" =====> "+(String)val2+" V");          



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USB Voltage Current Meter [B037]


* Specs


100% Brand New and High Quality

Display data: Voltage Current Capacity Time


1.Input USB

2.RTZ, Reset button, press it three seconds will Reset

3.Out USB

4.Voltage: 3V-9V ( 1% accuracy )

5.Current: 0-3A ( accuracy of 0.4% )

6.Battery Capacity (0-99999mah)

7.Working time (0-99Hour)

8.The working time and Capacity have Memory function when power off

Color:As the picture show

Size: 7.3cm*2.3cm*1.35cm (LXWXH)

Quantity:1 Pcs

Net Weight: 25g 

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Dual Digital Volt Meter 100V 10A [B030]


* Specs

Working voltage:4.5-30V DC

Note: The maximum input voltage can not exceed 30V, otherwise there is the danger of burning

Working current:≤20mA

Display: 0.28" Two color blue and red

Measuring range: DC 0-100V 0-10A

Minimum resolution (V): 0.1V

Refresh rate: ≥100mS / times

Measure accuracy: 1% (± 1 digit)

Minimum resolution (A): 0.01A 

Operating temperature: -15 to 70° c

Working pressure: 80 to 106 kPa

size :47×28×16 mm/1.85*1.10*0.63"

Net Weight:19 g

Weight:29 g

* Contents

- Connect

2Line (Power)

Red ----- 5V (4.5V ~ 30V)

Black ----- GND



Red ----- External Power +=========> Load (+)

Black ----- External Power GND

Blue =============================> Load (-)

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DC 30V Analog Panel Voltmeter [D076]


* Specs


Ideal analog panel meter to measure voltage for experiment or home use.

With the accuracy of class 2.5, it can measure voltage from 0V to 30V.

Analog panel is easy to read and has low consumption.

Small in size, light in weight, convenient to carry.


Material: Plastic

Color: White

Meter Type: Analog

Accuracy: Class 2.5

Testing Voltage Range: DC0-30V

Item Size: 6.2 * 5.5 * 5.7cm / 2.4 * 2.2 * 2.2in

Item Weight: 56g / 2oz

Package Size: 6.5 * 6.5 * 6cm / 2.6 * 2.6 * 2.4in

Package Weight: 71g / 2.5oz

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