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Cal Current Sensor

Measure current between -12.5A and 12.5A with an accuracy of 55mV/A.
SKU: 45-2303
$19.95
Sensor Type
Three Wire Analog Sensor
Dimensions
32 mm x 32 mm x 5 mm
Mounting Holes
24 mm x 24 mm, 4mm ⌀
Power
3 V or 5 V DC, 5 mA
Signal Logic Levels
Analog 0 V - (3 or 5) V

Cable not included



To use this sensor:

  1. Determine the offset by taking an average reading with no current passing through the sensor. This value is usually ~485
  2. When current is passing through the sensor, take many readings (we use 100) to obtain an average.
  3. To get current, subtract the offset and then divide by 32.

current = (average - offset) / 32



For example, below, we graphed the current going into a motor controller against the power being sent to the motor.

Another application would be to know when a motor is stalled. When a motor stalls, the current spikes to multiple times the normal operating current. Your program can then turn off power to that motor or try driving the opposite direction.

Graph

PDF Main Component Specification

Sensor Type
Three Wire Analog Sensor
Dimensions
32 mm x 32 mm x 5 mm
Mounting Holes
24 mm x 24 mm, 4mm ⌀
Power
3 V or 5 V DC, 5 mA
Signal Logic Levels
Analog 0 V - (3 or 5) V

Cable not included



To use this sensor:

  1. Determine the offset by taking an average reading with no current passing through the sensor. This value is usually ~485
  2. When current is passing through the sensor, take many readings (we use 100) to obtain an average.
  3. To get current, subtract the offset and then divide by 32.

current = (average - offset) / 32



For example, below, we graphed the current going into a motor controller against the power being sent to the motor.

Another application would be to know when a motor is stalled. When a motor stalls, the current spikes to multiple times the normal operating current. Your program can then turn off power to that motor or try driving the opposite direction.

Graph

PDF Main Component Specification

Android Studio Example Program

Download the below program for an example of how to read this Analog sensor. The FTC SDK will supply a value from 0-5 representing a voltage.

In your configuration file, name an Analog Input "light" and name a Core Device Interface Module "Device Interface Module 1"

Android Studio Class MRI_Analog_Example.java