The INA3221 board and the smaller TK119 block side by side at an angle and to scale, both black boards with a large rectangular shunt resistor under each screw terminal: the INA3221 with three blue channel terminals and a 14-pin header, the TK119 with one black terminal marked LOAD and one red one marked POWER.

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Current Monitor Set: TK119 INA219 and INA3221

Two I²C current and voltage monitors: the TK119 with one INA219 on a 100 mΩ shunt, and the INA3221 with three channels on 50 mΩ. What the chip measures and what it works out, why the two resistors differ, the range and step each one gives, and the wiring for both.

Boards: 2one of each
Channels: 41 + 3
Rails: 0 to 26V

Start here · 01 What a shunt measures What is in the box

Product questions & answers ↓

The whole handbook11 articles · 60 min Pinout and specsThe pin table, and the questions people ask first

In this box

tk119

TK119 INA219 Current and Voltage Monitor

Full scale: 3.2A, widest setting
Rail: 0 to 26V
Supply: 3 to 5.5V
Address: 0x40one of four

The INA219 Current Monitor page

DatasheetPDF · ti.com

This one on its own /p/tk119

ina3221

INA3221 Triple-Channel Current and Voltage Monitor

Channels: 3measured at once
Full scale: 3.28A per channel
Rails: 0 to 26V
Alerts: 4open-drain pins

DatasheetPDF · ti.com

This one on its own /p/ina3221

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Current Monitor Set: TK119 INA219 and INA3221

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Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.