INA219模块

简介

26V、双向、零漂移、低侧/高侧、I2C 输出电流/功率监控器，可以用来检测电流，电压，功率。

接口介绍

• IN+和IN_：分别是接检测分流电阻的两端。
• GND：接电源负极
• Vs：电源正极（电压范围：3-5.5V）
• SCL：通讯时钟线
• SDA：通讯数据线
• A0和A1：地址选择引脚

用途

• 功率计
• 针对步进电机通过电流的控制进行力矩计算，以达到自适应力矩模式。（待验证）

设计要点

• BUS Voltage ： 总线电压 负载电压和分流电压的总和
• Load Voltage ： 负载电压
• Shunt Voltage ： 分流电压 分流电阻两端的电压，传感器测量电流的方式
• The bus voltage is the total voltage between power and GND. It is the sum of the load voltage and the shunt voltage.
• The load voltage is the voltage going to the load.
• The shunt voltage is the voltage drop across the shunt resistor that is in series with the load.. That is how the sensor measures the current.
• Since current obeys Ohm's Law, the voltage drop across the shunt resistor is proportional to the current flowing through the circuit. And since the resistance of the shunt is known, it is easy to calculate the current.

实物展示