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Use the USB Charger Doctor to measure the working voltage and current output for any USB port and project. This plastic dongle plugs between a USB device, and passes the data lines through. There's a 0.05 ohm resistor in line with the power pin that is used to measure current draw. The Doctor's digital display instantly reads the numbers out for testing devices such as chargers, cables, and cell phones.
You can use this device from 3.5-7VDC input voltage (although most USB devices tend to hover around 4.75 to 5.25) and up to 3A of current. It displays both voltage and current readouts. It's a very handy tool for testing USB devices, checking load levels and debugging battery chargers and boost converters.
Highlights:
- Mutual conversion between 3V and 5V, It's convenient for PI connected to external 5V sensors or modules
- Supports total of 8 channels
- Range of voltage converted: 1.8V~6VDC
How to Use:
In the case of translating between 3.3V and 5V system:
VCCA connects to 3.3V power supply
VCCB connects to 5V power supply
GND connects to power negative pole respectively, the two power supply should be common-grounded with each other
When Ax has 3.3V input, Bx will get 5V output
When Bx has 5V input, Ax will get 3.3V output
NO direction control required
Function | Range | Resolution | Accuracy | MAX.Value | Other |
DC Voltage | 6.000V | 0.001V | ±(0.5%+3) | 1000V | Input Resistance:10MΩ |
60.00V | 0.01V | ||||
600.0V | 0.1V | ||||
1000V | 1V | ||||
60.00mV | 0.01mV | 600mV | |||
600.0mV | 0.1mV | ||||
AC Voltage | 6.000V | 0.001V | ±(1.0%+3) | 750V | Input Resistance:10MΩ(600mV range, >60MΩ) Frequency Response: 40Hz-1kHz |
60.00V | 0.01V | ||||
600.0V | 0.1V | ||||
750V | 1V | ||||
60.00mV | 0.01mV | 600mV | |||
600.0mV | 0.1mV | ||||
DC Current | 6.000A | 0.001A | ±(1.2%+3) | 10A | MAX.Current: 10A(no more than 15 seconds) No Voltage input at this mode Frequency Response(AC): 40Hz-1kHz |
10.00A | 0.01A | ||||
60.00mA | 0.01mA | 600mA | |||
600.0mA | 0.1mA | ||||
AC Current | 6.000A | 0.001A | ±(1.5%+3) | 10A | |
10.00A | 0.01A | ||||
60.00mA | 0.01mA | 600mA | |||
600.0mA | 0.1mA |
Resistance | 600.0Ω | 0.1Ω | ±(0.5%+3) | 60MΩ | No Voltage input at this mode | |||||
6.000kΩ | 0.001kΩ | |||||||||
60.00kΩ | 0.01kΩ | |||||||||
600.0kΩ | 0.1kΩ | |||||||||
6.000MΩ | 0.001MΩ | |||||||||
60.00MΩ | 0.01MΩ | ±(1.5%+3) | ||||||||
Capacitance | 9.999nF | 0.001nF | ±(5.0%+20) | 9.999mF | No Voltage input at this mode | |||||
99.99nF | 0.01nF | ±(2.0%+5) | ||||||||
999.9nF | 0.1nF | |||||||||
9.999μF | 0.001μF | |||||||||
99.99μF | 0.01μF | |||||||||
999.9μF | 0.1μF | |||||||||
9.999mF | 0.001mF | ±(5.0%+5) | ||||||||
Frequency | 99.99Hz | 0.01Hz | ±(0.1%+2) | 9.999MHz | ||||||
999.9Hz | 0.1Hz | |||||||||
9.999kHz | 0.001kHz | |||||||||
99.99kHz | 0.01kHz | |||||||||
999.9kHz | 0.1kHz | |||||||||
9.999MHz | 0.001MHz | |||||||||
Duty Cycle | 1%~99% | 0.1% | ±(0.1%+2) | |||||||
Diode | √(DC forward current is 5mA, voltage is 3V) | No Voltage input at this mode | ||||||||
Continuity | √(no more than 50Ω) | |||||||||
Temperature | -20~1000℃ | 1℃ | ±(2.5%+5) | 1000℃ | ||||||
-4~1832℉ | 1℉ | 1832℉ |
Used as MOSFET or voltage regulator Heat Sink
Note: The voltage regulator is not included.
Package Includes:
1 x Heat Sink
2. Short circuit protection
3. Quantity: 1 pc
Minimum pressure | 2V |
Input Voltage | DC 24V(DC15V—40V) |
Output Voltage | DC 12V |
Output Power | 60W |
Output Current | 5A |
Conversion Efficiency | 90% |
Full Load Temperature Rise | 50 degree |
This power supply is a isolated industrial grade built-in power module with temperature, over current, and short circuit protection.
Features:
AC85 - 264V or DC110 - 370V wide voltage input
DC 5V(+/ -0.2V) 600mA isolated output
Input Current: 0.0273A/115VAC 0.014A/230VAC
Input surge current: 20A (230VAC)
Frequency range: 50/60 Hz
Operating Temperature: -30 - 70 ℃
Relative humidity: 20%- 90%
Rated power: 3W
Output efficiency: 80%
Module size: 40mm x 23mm x 23mm
Package includes:
1 x AC-DC Isolated AC 110V / 220V To DC 5V 600mA Constant Voltage Switch Power Supply Converter
This module is based on a resistive divider principle design, make the interface terminal input voltage reduced 5 times, A rduino analog input voltage up to 5V, then the input voltage of the voltage detection module can not be greater than 5V × 5 = 25V (if used 3.3V system, the input voltage can not exceed 3.3Vx5 = 16.5V). Because A rduino AVR chips used in 10 AD, so the resolution of the analog module is 0.00489V (5V / 1023), so the voltage detection module detects a minimum input voltage of 0.00489V × 5 = 0.02445V.
Parameters:
Voltage input range: DC0-25V
Voltage detection range: DC0.02445V-25V
Voltage analog resolution: 0.00489V
Wiring:
DC input connector:
the positive terminal connected to VCC,
the negative connected to GND
Output interface:
"+" is 5 / 3.3V,
"-" then GND,
"s" Arduino connected to the AD pin
Arduino Code:
#include
int val11;
int val2;
void setup()
{
pinMode(LED1,OUTPUT);
Serial.begin(9600);
Serial.println("Emartee.Com");
Serial.println("Voltage: ");
Serial.print("V");
}
void loop()
{
float temp;
val11=analogRead(1);
temp=val11/4.092;
val11=(int)temp;//
val2=((val11%100)/10);
Serial.println(val2);
delay(1000);
}
Raspberry Pi: https://kookye.com/2017/06/01/design-a-voltmeter-with-the-raspberry-pi-board-and-voltage-sensor/
Package Includes:
1 x Voltage detection Module



Product Features:
•With Li battery 8800mAH
•DC 5v,9v/12v15v/24v selectable
•With POE port
•Input Voltage :100V - 240V AC
•Small DC communication equipment, network peripherals such as: Modem, routers ,IP camera etc.
•Constant DC output, long backup time, smart chip control, zero transition.
Input Voltage Min: 14V
Maximum input voltage: 35V
Fixed output voltage: 12V
Pressure drop: 2V
Output channel number: 1
Number of pins: 3
Output current: 1.5A
Package Type: TO-220 Tube
Operating temperature range: 0℃ to + 150℃
SVHC (Highly Concerned Substances): No SVHC (20-Jun-2011)
Device number: 7812
Tolerance, operating voltage +: 4%
Voltage Rectifier Type: Positive Fixed
Maximum supply voltage: 27V
Power supply voltage minimum: 14.5V
Surface Mount Devices: Through Hole Installation
Package included:
1 x TO-220 Voltage Regulator IC
Resources:
Understanding How a Voltage Regulator Works
Description:
You can use this device from 3.5-7VDC input voltage (although most USB devices tend to hover around 4.75 to 5.25) and up to 3A of current. It flips between voltage and current readouts every 3 seconds or so. It's a very handy tool for testing USB devices, checking load levels and debugging battery chargers and boost converters.
Specifications:
- USB 1.x and 2.x - all data speeds. Does not have USB v3 pins so USB v3 connections will automatically downgrade to v2
- Working Range: 0~3A, 3.5~7VDC
- Resolution: 10mV / 10mA
- Operating Temperature: 0-60ºC
- Contents:
- Camera Board 360 Gooseneck Mount V2
Dimensions:
- 21mm x 53mm x 15mm / 0.8" x 2.1" x 0.6"
- USB Plug: 13mm / 0.5"
- Weight: 16.2g
Input voltage range: 4-40 v (40 v highest voltage limit)
Output voltage range:1.25V - 37V (input voltage must 2 V above output)
Output current: 2 A continuous output
Output power: maximum 15 w
Ripple frequency: 150 KHZ
Grain wave peak: 100 mv
IN + : input positive
IN - : input negative
OUT + : output positive
OUT - : output negative
Voltmeter precision: ± 5 ‰
Weight: 33g
Size: 7cm x 4cm
Package includes:
LM2596 voltage regulator converter module
- Integrated circuit
- Voltage regulator
- +5V
- Non Insulated
Resources:
Understanding How a Voltage Regulator Works
4. This is an entry level measuring solution. Do not expect 100% accuracy.
Product Type | PZEM-022 |
Accuracy | 1.0 grade |
Display Size | 51mm x 30mm |
Product Size | 89.6mm x 49.6mm x 24.3mm |
Weight | 150g(with split CT) |
Test Range | 1. Voltage: 80~260V 5. Frequency: 45~65Hz 6. Power factor: 0~1PF |
Function | 1. Electrical parameter measurement function (voltage, current, active power, energy, frequency, power factor) 2. Overload alarm function (over power alarm threshold, backlight and power flashing to alarm). 3. Power alarm threshold preset function (can set power alarm threshold). 4. The energy can be reset use the key. 5. Store data when power off. 6. Large-screen LCD 7. Backlight function. |

Package includes:
1 x CT
FAQ
Why is the test data wrong? Voltage * Current = Power, But power is less than the actual test voltage * Current, Why is that?
Answer: There are three types of power:
Active Power (P represents / unit W)
Reactive power (Q represents / unit Var)
Apparent power (S represents / unit VA)
Here we only talk about Active Power, for others, please google it:
P = U * I * cosφ, cosφ it represents the power factor, purely resistive load (Such as incandescent, heater, etc.) the power factor is generally close to 1,Between the inductive and capacitive load load power factor 0-1. So purely resistive load test time, P is substantially equal to or close to U * I. When Inductive or capacitive load test (Such as refrigerators, washing machines, televisions, computers, etc.) P<U*I, As for how much to keep the power factor related to the specific, Different for each appliance power factor.
Please Note: Raspberry Pi and sensors are not included
Raspberrypi CT Adaptor
Connect up to 7 Current and 1 voltage sensors to a Raspberry Pi 3B.(Not the 3B+)
Use with sct-013-000 split core current sensor and 230VAC to 9VAC power adapter

Description
- 7x Current sensor ports
- 1x ac Voltage sensor ports
- Arduino IDE programmable
- EmonCMS compatible.
- CSV serial output
- Atmega328 Microcontroller
- View/record data using Linux/Python/Emoncms
- Stackable - Up to 5 board stack on one Raspberrypi.
- Compatible with Raspberrypi 2 & 3.
Package Content
- 1 RPICT7V1 Master version 2 Unit.
- 4 Mounting Spacers
- 8 Mounting Screws
Recommended Sensors
- Voltage: 77DE-06-09
- Current: SCT-013-000 (100Amp)
Default Configuration
Output format is Emonhub by default. Output format configurable via serial interface.
Outputs 21 channels:
- Real Power x7 (Watts)
- Irms x7 (mAmps)
- Vrms x1 (Volts)
Parameters:
Node ID: 11
Scan interval: 5 seconds
Output: Emonhub
Default loaded sketch freely available on the wiki page.
Emoncms Ouput:
Please Note: Raspberry Pi and sensors are not included
Raspberrypi CT Adaptor
Connect up to 7 Current and 1 voltage sensors to a Raspberry Pi 3B.(Not the 3B+)

Description
- 7x Current sensor ports
- 1x ac Voltage sensor ports
- Arduino IDE programmable
- EmonCMS compatible.
- CSV serial output
- Atmega328 Microcontroller
- View/record data using Linux/Python/Emoncms
- Stackable - Up to 5 board stack on one Raspberrypi.
- Compatible with Raspberrypi 2 & 3.
Package Content
- 1 RPICT7V1 Master version 2 Unit.
- 4 Mounting Spacers
- 8 Mounting Screws
Recommended Sensors
- Voltage: 77DE-06-09
- Current: SCT-013-000 (100Amp)
Default Configuration
Output format is Emonhub by default. Output format configurable via serial interface.
Outputs 21 channels:
- Real Power x7 (Watts)
- Irms x7 (mAmps)
- Vrms x1 (Volts)
Parameters:
Node ID: 11
Scan interval: 5 seconds
Output: Emonhub
Default loaded sketch freely available on the wiki page.
Emoncms Ouput:
Output Voltage | 3.3 V | |
Output Type | Fixed | |
Package Type | TO-220 | |
Maximum Output Current | 1.3A | |
Mounting Type | Through Hole | |
Maximum Input Voltage | 15 V | |
Pin Count | 3 | |
Number of Outputs | 1 | |
Polarity | Positive | |
Quiescent Current | 5mA | |
Accuracy | ±1% | |
Minimum Operating Temperature | 0 °C | |
Maximum Operating Temperature | +150 °C | |
Height | 9.15mm | |
Width | 4.6mm | |
Line Regulation | 6 mV | |
Length | 10.4mm | |
Dimensions | 10.4 x 4.6 x 9.15mm | |
Load Regulation | 10 mV |
Resources:
Understanding How a Voltage Regulator Works
Overview
This is a 4-ch current and power monitor HAT designed for Raspberry Pi. Via the I2C or SMBus interface, it is easy to monitor each channel's current, voltage, and power consumption, as well as the voltage between both sides of the sampling resistor.
Features
- Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
- 4-ch monitoring, via I2C/SMBus interface
- Onboard 0.1Ω 1% sampling resistor, allows measuring bi-directional current up to 3.2A
- Embedded 12-bit ADC, supports multiple successive converting, 0~26V voltage measuring range
- Directly calculate and output measured power value through additional multiply register
- I2C control pins for connecting with other host boards
- Comes with development resources and manual (examples for Raspberry Pi/Arduino/STM32)
Specifications
- Operating voltage: 3.3V/5V
- Control interface: I2C/SMBus
- Sampling resistor: 0.1Ω 1%
- Voltage range: 0~26V
- Current range: ±3.2A
- Resolution: 0.8mA (±3.2A range) OR 0.1mA (±400mA range)
- Dimensions: 65mm × 30mm
- Mounting hole size: 3.0mm
Dimensions

Development Resources
- 1