python读取INA3221

INA3221是一款用于测量电流、电压和电源监控的I2C数字接口芯片。在Python中，你可以通过I2C通信模块如`smbus`或第三方库`adafruit_ina3221`来读取该传感器的数据。

首先，你需要确保安装了必要的库，比如`RPi.GPIO`（如果你在树莓派上使用）和`smbus`（或` Adafruit_PureIO` 和 `adafruit INA3221` 库）：

pip install RPi.GPIO
pip install smbus
# 或者对于Adafruit库
pip install adafruit-circuitpython-ina3221

然后，这里是一个基本的例子来展示如何连接和读取INA3221的数据：

import RPi.GPIO as GPIO
from smbus import SMBus

# 连接到I2C总线，通常树莓派的I2C地址是0x40（如果没有修改过）
address = 0x40
bus = SMBus(1)  # 根据树莓派版本选择1或0，对应于SCL和SDA引脚

def read INA3221(channel):
    reg_shunt_ohms = 0x05
    reg_bus_volt = 0x07
    reg_bus_adc = 0x0B
    reg_power = 0x0C

    shunt_voltage = bus.read_word_data(address, reg_shunt_ohms)
    shunt_voltage *= 3.3 / (2**16 - 1)  # 转换到mV
    bus_voltage = bus.read_word_data(address, reg_bus_volt) * 3.3 / (2**16 - 1)
    bus_adc = bus.read_byte_data(address, reg_bus_adc)

    power = (shunt_voltage * bus_adc) / (2**16)

    return {
        f"Channel {channel} Shunt Voltage": shunt_voltage,
        f"Channel {channel} Bus Voltage": bus_voltage,
        f"Channel {channel} Power": power,
    }

# 指定你想读取的通道，范围通常是1到4
channels = [1, 2, 3]
for channel in channels:
    print(f"Channel {channel}:", read(INA3221(channel)))

GPIO.cleanup()  # 使用完后记得关闭GPIO资源