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Description: INA219 DC Current & Power Measurement Module

Here’s a detailed breakdown of the INA219 DC Current & Power Measurement Module — how it works, key specifications, how to use it, what to watch out for, and typical applications.

What it is:

The INA219 module is based on the TI‑chip INA219, which is a high‑side current shunt & power monitor with an I²C interface.

In practice the breakout board integrates that chip plus a precision shunt resistor (typically 0.1 Ω) and the necessary pins/headers so you can measure:

• Bus voltage (i.e., the supply voltage of the load)
• Shunt voltage drop (across the resistor) → from which current is calculated
• And from those two, power (voltage × current) is derived by the chip.
  
  Because it performs high‑side sensing (i.e., the shunt is placed in the positive rail to the load) the ground path is left undisturbed

Key Specifications:

Here are the key specs you should know (from module/breakout board plus chip).

Chip (INA219) specs:

• Supply voltage (VCC) for the chip: 3.0 V to 5.5 V
• Bus voltage (voltage being sensed) up to ~ 0 to 26 V.
• I²C/SMBus interface, up to 16 programmable addresses.
• Accuracy: For INA219B version the accuracy is up to ~0.5 % over temperature.
• Internal resolution: 12‑bit ADC for the shunt/bus measurement.

Typical breakout board module specs:

• On‑board shunt resistor: 0.1 Ω, 1% tolerance, ~2 W rating (depending on board).
• Current measurement range: ±3.2 A (with 0.1 Ω shunt) and resolution ~0.8 mA (when configured with default resistor).
• Bus voltage measurement: up to ~26 V DC.
• Module supply/logic compatibility: 3.3 V or 5 V logic (i.e., can be used with Arduino/ESP32/others).

How to Use (Connection & Setup):

Here’s typical steps/setup to use the module:

1. Powering the module
   • Connect the module VCC pin to your microcontroller’s 3.3 V or 5 V supply (depending on your board’s version).Connect GND of the module to the same ground as your microcontroller and the load ground (this ensures the bus voltage measurement is correct).
2. Current‑shunt wiring (high side)
   • The module’s screw terminals (or header) labelled VIN+ and VIN‑ go in the positive supply path of your load:
     • Supply positive → VIN+ on module
     • VIN‑ on module → load positive terminal
   • So the shunt resistor is between the supply and the load. This way, the module “sees” the current going to the load.
   • If you only care about voltage and not current, you can connect the bus voltage to VIN+ but you still need ground common. But typically you use VIN+ → supply and VIN‑ → load.
3. I²C connection
   • Connect SDA and SCL pins of the module to the SDA / SCL pins of your microcontroller.
   • If using multiple modules, make sure the I²C address is set via jumpers/solder pads (modules often allow changing from the default 0x40 to e.g. 0x41, 0x44, 0x45).
4. Software setup
   • Use an appropriate library (e.g., Adafruit’s INA219 library) for your microcontroller.
   • In your code you typically configure the calibration register (to set the shunt resistor value and full‑scale current), then you can read: bus voltage (V), shunt voltage (mV), current (A), and power (W).
   • Example: If your module’s shunt is 0.1 Ω you set that in calibration so the library computes current = V_shunt / 0.1Ω etc.

Package include:

1 x INA219 DC Current & Power Measurement Module