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sensor:ina219 [2026/02/13 15:34] – vamsansensor:ina219 [2026/02/13 15:58] (current) – [I²C topics on lamaPLC] vamsan
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   * **Multi-Function Reporting:** It calculates and reports bus voltage, shunt voltage drop, current, and total power (W) directly.   * **Multi-Function Reporting:** It calculates and reports bus voltage, shunt voltage drop, current, and total power (W) directly.
   * **Programmability:** Supports software-programmable calibration, filtering (averaging up to 128 samples), and conversion times.   * **Programmability:** Supports software-programmable calibration, filtering (averaging up to 128 samples), and conversion times.
-  * **Daisy-Chaining:** Supports up to 16 programmable I2C addresses, allowing multiple modules to run on the same bus. +  * **Daisy-Chaining:** Supports up to 16 programmable I²C addresses, allowing multiple modules to run on the same bus. 
  
 **Safety & Limitations** **Safety & Limitations**
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   * **Inductive Loads:** Users should be cautious with large motors, as //"flyback"// voltage spikes can exceed the 26V threshold and destroy the sensor.    * **Inductive Loads:** Users should be cautious with large motors, as //"flyback"// voltage spikes can exceed the 26V threshold and destroy the sensor. 
  
 +====== CJMCU-219 Pinout ======
 +{{ :sensor:ina219_1.png?400|CJMCU-219 Pinout}}
 +**Logic and Power Pins**
 +
 +These pins connect to your microcontroller (e.g., Arduino or Raspberry Pi) to power the sensor and transmit data. 
 +
 +  * **VCC:** Supply voltage for the module (**3.0V to 5.5V**).
 +  * **GND:** Common ground for both power and logic.
 +  * **SCL:** I²C serial clock line.
 +  * **SDA:** I²C serial data line.
 + 
 +**Measurement (Load) Pins**
 +
 +These pins are placed in series with the positive side (high-side) of the circuit you want to monitor. 
 +
 +  * **Vin+:** Connect to the positive terminal of your power source (e.g., battery).
 +  * **Vin-:** Connect to the positive terminal of your load (the device being powered). 
 +
 +**I²C addressing Pins (A0 & A1)**
 +
 +Some versions of the CJMCU-219 include solder pads labeled **A0** and **A1**. By default, these are connected to GND, setting the I2C address to **0x40**. 
 +
 +Bridging these pads to VCC allows you to set the address to any of 16 values (**0x4F**), enabling multiple sensors on the same I²C bus. 
 +
 +<color red>Caution: The maximum bus voltage the Vin pins can safely handle is 26V DC.</color>
 ==== Arduino wiring ==== ==== Arduino wiring ====
   * VCC → Arduino 5V (o 3.3V).   * VCC → Arduino 5V (o 3.3V).
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 ==== Arduino code ==== ==== Arduino code ====
-To begin using the CJMCU-219 with Arduino, the easiest method is to utilize the **Adafruit INA219** library.+To begin using the CJMCU-219 with Arduino, the easiest approach is to use the **Adafruit INA219** library.
  
-This example code sets up the sensor and outputs voltage, current, and power readings to the Serial Monitor at 115200 baud.+This example code sets up the sensor and outputs voltage, current, and power readings to the Serial Monitor at **115200 baud**.
  
 A simple example with the Adafruit_INA219 library involves initializing the sensor and repeatedly reading and displaying bus voltage, shunt voltage, load voltage, current, and power. The complete code is available in the provided source document. A simple example with the Adafruit_INA219 library involves initializing the sensor and repeatedly reading and displaying bus voltage, shunt voltage, load voltage, current, and power. The complete code is available in the provided source document.
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   * **setCalibration_16V_400mA():** Highest precision for low-voltage, low-current projects.    * **setCalibration_16V_400mA():** Highest precision for low-voltage, low-current projects. 
  
-==== Example codes ==== 
-none 
 ===== I²C topics on lamaPLC ===== ===== I²C topics on lamaPLC =====
 {{topic>i2c}} {{topic>i2c}}
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 \\ \\
  
-{{tag>ENS160 ScioSense gas-quality i2c communication sensor arduino code}}+{{tag>CJMCU-219 INA-219 INA219 breakout_board i2c communication sensor voltage current arduino code CJMCU}}
  
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