Current/Power Monitor HAT

Current/Power Monitor HAT

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Primary Attribute Category: Raspberry Pi {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

Website International: Waveshare website Chinese: 微雪电子

Onboard Interfaces RPi SMBus

Related Products

Instruction

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 online development resources and manual (examples for Raspberry Pi/Arduino/STM32).

Specification

• 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

Hardware

This module can be used to test currents and voltages of four channels, they are (IN1+ IN1-), (IN2+ IN2-), (IN3+ IN3-), and (IN4+ IN4-).

INx+ is the current input, and INx- is the current output. The module measures the differential voltage of the sample resistor connected between INx+ and INx-, with the voltage, we can measure the working current.

The module supports measuring bidirectional current, so users can invert the input and output.

Note that you must connect GND when testing different power adapters, otherwise, the VBus voltage cannot be measured.

Raspberry Pi examples

Enable the I2C Interface

Open the Raspberry Pi terminal and enter the following command to access the configuration screen:

sudo raspi-config 
Select Interfacing Options -> I2C -> yes to start the i2C kernel driver

And then reboot the Raspberry Pi:

sudo reboot

PS: If you are using the system of the Bullseye branch, you need to change "apt-get" to "apt". The system of the Bullseye branch only supports Python3.

To test the example, you should first attach the monitor HAT to Raspberry Pi, or you can connect the monitor HAT to the I2C interface of Raspberry Pi by wires.

Open the terminal of Raspberry Pi and follow the commands:

sudo apt-get install p7zip
wget https://files.waveshare.com/upload/6/69/Current-Power_Monitor_HAT_Code.7z
7zr x Current-Power_Monitor_HAT_Code.7z -r -o./Current-Power_Monitor_HAT
cd Current-Power_Monitor_HAT/RaspberryPi
python3 ina219.py

You can get data on the VBus voltage, the differential voltage of the sampling resistor, voltage input, power, and current.

STM32 examples

The examples provided are based on NUCLEO-F103RB, you can connect it to the table.

PIN	NUCLEO
VCC	3.3V
GND	GND
SDA	SDA/D14/PB9
SCL	SCL/D15/PB8

Download the demo code from #Resources, unzip and go to the directory of the STM32 project. Open the project by Keil5.

Program the demo codes to your NUCLEO board and test.

The data of the VBus voltage, the differential voltage of the sampling resistor, voltage input, power, and current will be printed to the serial port.

Arduino

The example provided is based on Waveshare UNO Plus.

PIN	UNO Plus
VCC	3.3V
GND	GND
SDA	SDA/D14
SCL	SCL/D15

If you use other Arduino boards, please check the working voltage of your Arduino board, and change the VCC to 5V/3.3V according to it.

Download the demo codes from #Resouces. unzip and go to the directory of Arduino codes. Open it with Arduino IDE and program it to your board.

The data of the VBus voltage, the differential voltage of the sample resistor, voltage input, power, and current will be printed to the serial port.

Resources

Documents

• Schematic

Demo codes

• Demo codes

Datasheet

• INA219 Datasheet

FAQ

Question:Why can't I measure above 16V?

 Answer:

Open ina219.py and find the following:

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Question:Can the Current/Power Monitor HAT be used in case of AC current?

 Answer:

The monitor HAT uses INA219 IC, which is used for DC power monitors only.

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Question:Is it possible to use multiple "Current/Power Monitor HAT" on the same Raspberry Pi System? Maybe if the I2C address of the ina219 somehow could be modified?

 Answer:

The current power monitor HAT doesn't support changing the I2C address.
PCB doesn't reverse pad for modifying I2C address, in this case, you cannot stack them for more channels.

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