INA219 module

Introduction

26V, bidirectional, zero-drift, low-side/high-side, I2C output current/power monitor, can be used to detect current, voltage, and power.

Interface introduction

• IN+ and IN_: respectively connected to the two ends of the detection shunt resistor.
• GND: Connect to the negative pole of the power supply
• Vs: positive pole of power supply (voltage range: 3-5.5V)
• SCL: communication clock line
• SDA: communication data line
• A0 and A1: address selection pins

use

• dynamometer
• Torque calculation is performed for stepper motors through current control to achieve adaptive torque mode. (To be verified)

Design Points

• BUS Voltage: The sum of bus voltage, load voltage and shunt voltage
• Load Voltage: Load voltage
• Shunt Voltage: Shunt voltage The voltage across the shunt resistor, the way the sensor measures current
• 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.

Physical display