Current/Voltage/Power Monitor HAT for Raspberry Pi

Introduction

This is current and power monitor HAT designed for Raspberry Pi. Support 4-channel, it is easy to monitor current, voltage, and power consumption, voltage across the sampling resistor via the I2C or SMBus interface.

Model: RPA20901S

Features

• Standard Raspberry Pi 40PIN GPIO extension header, suitable for all Raspberry Pi boards
• Support 4-channel detection, can communicate through 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
• The output measurement power can be directly calculated through the additional multiplication register
• I2C control pins for connecting with other main boards easily

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

Usage

Use with Raspberry Pi

1. Open the I2C interface 1) Execute in the terminal:

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

• Step 1. Install the necessary library
  

1) Install BCM2835, open the Raspberry Pi terminal, and run the following command

HTTP wget : //www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz
zxvf bcm2835 tar - 1.60 . tar . GZ
bcm2835 cd - 1.60 /
sudo ./ the configure
sudo make && sudo make check && sudo make install

2) Update wiringPi to version 2.52

sudo apt - get install wiringpi
HTTPS wget : //project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg - i wiringpi - latest . deb
gpio - v
#You will see gpio version: 2.52, indicating successful installation

3) Install Python library

#python2
sudo apt - get update
sudo apt - get install python - pip
sudo pip install RPi . GPIO
#python3
sudo apt - get update
sudo apt - get install python3 - pip
sudo pip install RPi . GPIO

• Step 2. Download the sample program
  

sudo apt - get install p7zip - full
HTTP wget : //www.waveshare.net/w/upload/b/b7/PoE_HAT_B_code.7z
7z x PoE_HAT_B_code . 7z - r - o ./ PoE_HAT_B_code

• Step3. Run the test routine
  

1) C

cd PoE_HAT_B_code / c /
make clean 
make
sudo ./ main

2) Python

cd PoE_HAT_B_code / python /
sudo python main . py

• Set the fan start temperature
  

#C
Nano examples the sudo / main . C
# POE_HAT_Display() The last parameter of the function sets the fan opening temperature
 
#python 
Nano examples sudo / main . Py
# POE.POE_HAT_Display() Function parameter to set the fan opening temperature

• Set boot up
  

1) Before setting the startup, compile the routine first.

Nano sudo / etc / rc . local

2) Set boot up. Add sudo /home/pi/Fan_HAT/c/main & before exit 0. Note that you must add "&" to run in the background, otherwise the system may not start.

fi
sudo / home / pi / PoE_HAT_B_code / c / main &
exit 0