3 Channel I2C Voltage/Current Monitor based on the INA3221 IC with both pin headers and Grove ConnectorDesigned by SwitchDoc Labs in United States of America
Sometimes, you want to measure lots of things in your system. A great example is when you have a solar powered system. To figure out what is going on in your solar system dynamically, you need to...Read More…
Sometimes, you want to measure lots of things in your system. A great example is when you have a solar powered system. To figure out what is going on in your solar system dynamically, you need to measure the current and voltage for the Solar Cells, Batteries and the Load (computer) all at the same time.
The INA3221 Breakout Board supports both the Arduino and Raspberry Pi.
The conventional way to do this is to use three $10 INA219 (same function, but only one channel) for a cost of $40 and much more wiring / space. This INA3221 breakout board will do the same job as three INA219's but for about half the cost and about 50% of the space.
This latest version of this board now also provides a standard Grove I2C connector. See this Grove Tutorial.
Software is provided for both the Arduino and Raspberry Pi.
SwitchDoc Labs developed this pure Python INA3221 Raspberry Pi library as part of the SunAirPlus product development and for this INA3221 Breakout Board.
Here are several articles about these drivers:
It is similar to using three INA219 High Side Current Monitors, but not quite. There are significant differences in the chip itself and especially in the software needed. In SunAirPlus, we want to measure the current and voltage for all three major subsystems: The LiPo Battery, Solar Panels and the Computer.
The software is located on the SwitchDoc Labs github under https://github.com/switchdoclabs/SDL_Pi_INA3221.
Arduino drivers are also located on github under https://github.com/switchdoclabs/SDL_Arduino_INA3221.
To use the INA3221, you connect the I2C bus up to an Arduino or Raspberry Pi and then connect the loads that you want to measure as shown in the block diagram above.
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