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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
1 x USB Voltage and Current Meter
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.
Specifications:
Voltage range: 3.3V-9V
Current range: 0-3A
Voltage display: red
Current display: blue
Out put : 2 USB
Size: 52mm x 34mm x12mm
Weight: 16g
Shell color: Dark black
What's in the box?:
1 x Voltage Tester Dual USB
- Auto Range.
- True RMS measurement.
- Resistance capacitance frequency file high voltage 550V protection.
- Large screen display, the maximum of 6000 words.
- Sampling rate: about 3 times per second.
- Temperature measuring.
- Backlight display.
- Data retention.
- Polarity automatic recognition.
- Low voltage display.
- 10A large current measurement MA level small current measurement Automatic shutdown.
- Main measurement: AC / DC voltage, AC / DC current, resistance, capacitance.
- Diode / off measurement, frequency and duty ratio measurement.
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℉ |
- Measurement mode: double-integral style A/D transform
- Sample rate: 3 times per second
- Over range indication: OL
- Powered by 2 x AAA batteries (Not included).
- Working Environment: 0-40 degrees relative humidity: <80%
- Product size: approx. 130 x 65 x 30mm/5.11 x 2.55 x 1.18''
- Net weight: approx. 170g
- Gross weight: approx.238g
Please note: Raspberry Pi and sensors are NOT INCLUDED

Raspberrypi AC current hat with temperature
- 3x AC Current Ports.
- 1x Temperature Ports.
- Provides Irms, EstimatedPower, Temperature.
- View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
- Configurable from serial port.
- Open Source Arduino Firmware.
- 1 RPICT3T1 Unit.
- 2 Mounting Stand off with screws.
Recommended SensorsTemperature:Current Sensor:
- SCT-013-000 (0A to 30A)
Technical Specifications
Microcontroler | Atmel Attiny84 |
MCU Frequency | 8Mhz |
Operating Voltage | 3.3V |
Waveform Sampling | 2500sps |
Fastest Data Polling | 600ms |
Vertical Resolution | 10 bits (1024 steps) |
Communication | UART Serial Port |
Firmware | Arduino (open source) |
Dimensions | 56x35mm |
Programming port | 6 pin ISP |
Compatible OS | Any supporting GPIO serial port access |
Compatible Raspberrypi | All of Family 1,2,3,4 and Model A, B |
Compatible CT | Current output type |
AC Current Range | 30A |
Max Temperature probes | 8 |
Smallest Readable Current | Approx 50mA to 150mA |
Scope of Use
This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
- 7x AC Current Ports.
- 1x AC Voltage Ports.
- Provides Irms, Vrms, RealP, ApparentP, ReactiveP, PFactor, Frequency, EstimatedP.
- View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
- Configurable from serial port.
- Open Source Arduino Firmware.
- Stackable with RPICT8 Slave.
- 1 RPICT7V1 Unit.
- 4 Mounting Stand off with screws.
Recommended SensorsVoltage:Current:
- SCT-013-000 (100A)
Technical Specifications
Microcontroler | Atmel Atmega328p |
MCU Frequency | 16Mhz |
Operating Voltage | 5V |
Waveform Sampling | 4400sps |
Fastest Data Polling | 1400ms (all 7 channels) |
Vertical Resolution | 12 bits (4096 steps) |
Communication | UART Serial Port |
Firmware | Arduino (open source) |
Dimensions | 56x65mm |
Programming port | 6 pin ISP |
Compatible OS | Any supporting GPIO serial port access |
Compatible Raspberrypi | All of Family 1,2,3,4 and Model A, B |
Compatible CT | Current output type |
AC Current Range | 100A |
AC Voltage Range | 240V |
Smallest Readable Current | Approx 50mA to 150mA |
Scope of Use
This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
This is split-core current transformer is an AC current sensor. It is used for current measurement, monitor and protection for AC motors, lighting equipment, air compressors, home automation etc.
Features:
- Opening size: 13x13mm
- Rated input current (RMS): 10% - 120% of that is 3A - 36A
- Output voltage(RMS): linear output. When the input current is 30A, the output voltage is 1V
- Linearity: ± 3%
- Output connectors: 3.5mm standard three-pin plug
- Lead length: 1 m
What's in the box?
1 x Current sensor
This sensor is perfect for use with our Raspberry Pi RPICT3T1 current and temperature sensor board.
This is a split-core current transformer which is used as an AC current sensor. It is popularly used for current measurement, monitoring and protection for AC motors, lighting equipment, air compressors, home automation etc.
Features:
- Opening size: 13 x 13mm
- Rated input current (RMS): 10% - 120% of that is 1A~100A
- Output voltage(RMS): linear output. when the input current is 100A, the output voltage is 1V
- Linearity: ± 3%
- Output connectors: 3.5mm standard three-pin plug
- Lead length: 1m
What's in the box?
1 x Current sensor
Please note: Raspberry Pi and sensors are NOT INCLUDED

Online Documentation
- 3x AC Current Ports.
- 1x Temperature Ports.
- Provides Irms, EstimatedPower, Temperature.
- View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
- Configurable from serial port.
- Open Source Arduino Firmware.
- 1 RPICT3T1 Unit.
- 2 Mounting Stand off with screws.
Recommended SensorsTemperature:Current Sensor:
- SCT-013-000 (0A to 100A)
Technical Specifications
Microcontroler | Atmel Attiny84 |
MCU Frequency | 8Mhz |
Operating Voltage | 3.3V |
Waveform Sampling | 2500sps |
Fastest Data Polling | 600ms |
Vertical Resolution | 10 bits (1024 steps) |
Communication | UART Serial Port |
Firmware | Arduino (open source) |
Dimensions | 56x35mm |
Programming port | 6 pin ISP |
Compatible OS | Any supporting GPIO serial port access |
Compatible Raspberrypi | All of Family 1,2,3,4 and Model A, B |
Compatible CT | Current output type |
AC Current Range | 100A |
Max Temperature probes | 8 |
Smallest Readable Current | Approx 50mA to 150mA |
Scope of Use
This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
- 7x AC Current Ports.
- 1x AC Voltage Ports.
- Provides Irms, Vrms, RealP, ApparentP, ReactiveP, PFactor, Frequency, EstimatedP.
- View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
- Configurable from serial port.
- Open Source Arduino Firmware.
- Stackable with RPICT8 Slave.
- 1 RPICT7V1 Unit.
- 4 Mounting Stand off with screws.
Recommended SensorsVoltage:Current:
- SCT-013-000 (100A)
Technical Specifications
Microcontroler | Atmel Atmega328p |
MCU Frequency | 16Mhz |
Operating Voltage | 5V |
Waveform Sampling | 4400sps |
Fastest Data Polling | 1400ms (all 7 channels) |
Vertical Resolution | 12 bits (4096 steps) |
Communication | UART Serial Port |
Firmware | Arduino (open source) |
Dimensions | 56x65mm |
Programming port | 6 pin ISP |
Compatible OS | Any supporting GPIO serial port access |
Compatible Raspberrypi | All of Family 1,2,3,4 and Model A, B |
Compatible CT | Current output type |
AC Current Range | 30A |
AC Voltage Range | 240V |
Smallest Readable Current | Approx 50mA to 150mA |
Scope of Use
This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
The RPIZ_CT3T1 is the same unit as the RPICT3T1 in the Raspberry pi Zero format.
Refer to the RPICT3T1 for full documentation.
Use with sct-013-000 split core current sensor and DS18B20 temp sensor
Please note: Raspberry Pi Zero and sensors are not included
The RPIZ_CT3T1 is the same unit as the RPICT3V1 in the Raspberry pi Zero format.
Refer to the RPICT3V1 for full documentation.
Use with sct-013-000 split core current sensor and 230VAC to 9VAC power adapter
Please note: Raspberry Pi Zero and sensors are not included
The WCS1800 Hall Current sensor has two functions
- current detection
- over current protection (can be preset from 0.5A to 35.0A)
Features:
Operating voltage: DC 5V
Current detection range: DC +-35A, AC 25A
Linearity: K=60mV/A
Limit current range: 0.5A to 35A(for on/off value output)
Over current signal indicator LED
Sampling current conversion analog voltage signal output and it can connect ADC; TTL level signal output and it can connect MCU IO port control
Board size 37mm x 31mm
Working temperature: 25 to 85C
Interface

VCC: power positive
DOUT: TLL high/low level signal output
GND: power negative
AOUT: sampling current signal conversion voltage output port
Analog voltage signal output (AOUT)
Relationship between detection current and analog signal output is shown below:
Analog signal output: V0=Vcc*0.5±la*K (la is actual current through current detection pin, and K is linearity)
Eg: Input current is 1A, Vcc=5V and WS1800 linearity is 60mV/A
- When the current flows in from positive direction: V0=Vcc*0.5+la*K, V0=(2.5+0.06)V=2.56V
- When the current flows in from negative direction: V0=Vcc*0.5-la*K, V0=(2.5-0.06)V=2.44V
- If it is an AC signal: V0=Vcc*0.5+la*K, V0=(2.5+0.06)V=2.56V
The above are ideal values. There might be some precision errors.
On/Off output(DOUT)
- Make sure the current flows in from the positive direction. Adjust to the desired current warning level.
- LED will be on when current is below the setting and DOUT will be low.
- When the detected current is higher than your setting, the LED will turn off and the DOUT pin will go high.
Package Includes:
1 x WCS1800 Hall current detection sensor
CJMCU-219 is a module with the I2C interface of zero drift and bi-directional current/power monitoring and control integrated circuit (IC), further expand the TI energy-saving electronic products.INA219 has the industry's highest precision and the small size, not only can monitor the pressure drop on the shunt resistor, sensing shunt power supply voltage, at the same time also can calculate the power.The device adopts the SOT23 packaging, but for the server, notebook computer, power supply, battery management and digital electric vehicle and telecommunication equipment measuring flu provide small, low cost solution.
INA219-40 c to 85 c temperature range and can realize the maximum error of 1% accuracy, maximum offset of 100 uV.The advantage of the high precision of the product in combination with 12 resolution, can help clients as much as possible, reduce the pressure drop on the shunt resistor, which can minimize the power loss and power consumption, and saving board space.The device epic of 26 bus voltage range of 0 V to V.
INA219 other important features include:
- Calibration programmable registers can directly read its unit of measure is the ampere current, and power in watts per read.
- For as many as 128 sampling averaging, in order to realize filter in noise environment.
- The I2C interface has a timeout, not only can avoid the bus lock, but also can provide high-speed mode, meet the communication requirements of up to 3.4 MHz.
- All features are support software programmable INA219.
- Using single power supply, the working voltage between 3.0 to 5.5 V.
Package Includes:
1 x INA219 board
Hardware compatible with StepStick and Pololu A4988
Drive capability up to 1.7A (RMS) continuous coil current - 2.8A Peak
Step/Dir interface with microstep interpolation (up to 256 microsteps)
Configuration via CFG pins or UART interface
Motor voltage: 5.5...28V
Logic voltage: 3.3...5V
RSense: 0.11 Ohm
stealthChop2 - for quiet operation and smooth motion
spreadCycle - highly dynamic motor control chopper (enableable via UART, OTP, CFG Pin)
coolStep - current control for energy savings
stallGuard4 - sensorless motor load detection
Package Includes:
1 x TMC2209 V3.1
1 x Heatsink
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)
- 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

- Designed for Raspberry Pi series, compatible with Raspberry Pi 3 / 3B / 4B, etc.
- I2C bus communication, monitoring the batteries voltage, current, power, and remaining capacity in real time
- Multi battery protection circuits: over charge/discharge protection, over current protection, short circuit protection, and reverse protection, along with the equalizing charge feature, more safe and stable
- Onboard 5V regulator, up to 5A continuous output current, more sufficient power source for Raspberry Pi
- 5V USB output, convenient for powering other boards
- Batteries warning indicators, easy to check if the battery is connected correctly
- Comes with development resources and manual
Specifications:
OUTPUT VOLTAGE | 5V | CHARGER | 8.4V 2A |
---|---|---|---|
CONTROL BUS | I2C | DIMENSIONS | 56 × 85mm |
BATTERY SUPPORT | 2x 18650 Li batteries(NOT included) | MOUNTING HOLE SIZE | 3.0mm |
What's in the box ?
1 x UPS Hat (B)
1 x 8.4v Battery Charger
1 x Acrylic protection panel
1 x Screws pack
- The 18650 batteries are NOT included
- Please note that the battery length SHOULD be less than 67mm, some batteries with protection plate in the market are NOT supported, learn more.
Resources and Services :
WIKI: UPS_HAT_(B)





(** Raspberry Pi, Cables are for reference ONLY, the Raspberry Pi, cables and Fan HAT are NOT included.)


Everyone need a test pen to make sure if the line is clear from high voltage electricity, especially when you are working with AC (Alternating Current) line. This is alternative to test pen where it can detect AC voltage without touching the wire/contact itself :) And Yes! It works.
Get it near to your AC wire or plug (few millimeter) and if there is AC voltage, the LED will start to blink and the on board buzzer will also buzz. And there LED (another LED) activation push button if you need eatra helping light when you work :)
It is powered by 2 x AAA (1.5V) battery, not included in the package.
Specifications:
- Sensitivity Range: 90V-1000V AC 50-60Hz
- Voltage Indication: Beeper, LED Flashing
- Power Requirement: 2 AAA batteries (not included)
- Dimension: 160 x 17 x 18mm
- Auto power-off:Yes
- Low Battery Power Indication:Yes
Features:
- Wide Testing Range,within 90-1000V AC (Malaysia is 240VAC), All Electric Appliances in Your Family can be Tested by it.
- High Efficiency. As long as voltage is detected, the LED in the tester pen will illuminates. It is easy to notice. And this voltage pen detector is powered by 2 AAA batteries(not included).
- 100% Safe. The Voltage Pen Tester detects Voltage in a non-contact way, so do not worry about there could be any possibility of being shocked by the electricity.
- High Quality. Being a home electrician , you will do the job better with it.
- Easy to use. LED in the voltage tester pen can illuminate the working environment. You can use the Non Contact Voltage Detector in circuit breakers, lighting fixtures, switches, outlets, wires and anywhere you need it.
Whats in the box:
1 x Voltage Test Pen
Resources:
Pen Style Non Contact Alarm AC Voltage Detector with LED illumination (90V~1000V/2*AAA)
- 1