KR Sense Current and Voltage Sensor - 90A

The KR Sense 90A is a small voltage and current sense breakout board. DC current is determined by measuring a voltage drop across a parallel shunt resistor, then converted to a final analog voltage output by the INA-169. Voltage sense is accomplished by scaling to 3.3V ADC range by a precision resistor divider. This version of the sensor features a maximum voltage tolerance of 51.8 Volts at 89.4 Amps, to be exact.

Please be aware that KR Sense boards are supplied without leads or connectors. The pad sizes are large enough to accommodate 12 gauge heavy duty leads but care must be exercised when soldering. Smaller gauge leads are considerably easier to solder without creating shorts.

This product is compatible with the Attopilot 90A Voltage and Current Sensor Breakout.

  • Input resistor divider scaled for 13.6V Input voltage (recommended) for 3.3V output
  • 51.8V Max
  • 89.4A Max
  • Very low zero current offset
  • Analog current output scaled for 3.3V ADC
  • Self Powered

KR Sense Current and Voltage Sensor - 90A Product Help and Resources

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

2 Soldering

Skill Level: Rookie - The number of pins increases, and you will have to determine polarity of components and some of the components might be a bit trickier or close together. You might need solder wick or flux.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

2 Programming

Skill Level: Rookie - You will need a better fundamental understand of what code is, and how it works. You will be using beginner-level software and development tools like Arduino. You will be dealing directly with code, but numerous examples and libraries are available. Sensors or shields will communicate with serial or TTL.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Maeth / about 2 years ago / 1

    I used this:

    To get: Vout = Vin0.06354153258784205 Iout = Iin0.03567306495139524

  • Member #20638 / about 4 years ago / 1

    It would be a lot easier to use this if you gave Volts per Volt and Volts per Amp numbers. Instead we have to try to read it off of a fuzzy picture of a chart. A schematic would be helpful as well.

  • This is close to what i need, is there a way to modify it for 60-65v max?

  • MarcosBSD / about 4 years ago / 1

    According to Karlsson Robotics, if you want to calculate what the Vsource voltage is then you take the reading on Vout and divide 0.03691. If you want to determine what Vout should be for a source voltage of 25V you multiply so Vout=25*0.03691=0.923V The same applies to current divide the Iout by 0.0366 to find the current passing through the sensor. This appears to be different than the diagram listed as 25 volt Source Voltage would be over 1.4 Volts on Vout.

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