https://github.com/lab11/currentsense

Current sensor board for measuring current draw in embedded systems.
https://github.com/lab11/currentsense

Last synced: 5 months ago
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Current sensor board for measuring current draw in embedded systems.

• Host: GitHub
• URL: https://github.com/lab11/currentsense
• Owner: lab11
• Created: 2015-02-07T23:14:51.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2018-03-23T03:08:52.000Z (about 8 years ago)
• Last Synced: 2025-06-03T23:12:38.034Z (about 1 year ago)
• Language: HTML
• Homepage:
• Size: 9.12 MB
• Stars: 2
• Watchers: 12
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

          
CurrentSense

============



CurrentSense is a tool for measuring current in embedded systems.

Usage

-----

Description of the inputs:

- **Power Supply**: 3.3-6 volts that supplies power to the measurement circuitry.

- **Optional Test Input**: This input can be used to power the load under test.

This is particularly useful for energy-harvesting or other systems where the input

power is not stable.

- **I_Sense**: The measurable output signal that is proportional to current.

To calculate current, divide the I_Sense signal (in volts) by the number

that corresponds to the selected range value. This will return the current

in amps.

- **Range**: Select the maximum current you want to measure. Select this as

close to the maximum you wish to measure as possible.

- **Load VCC Select**: This selects how you would like to power the load under

test. The options

  - Power Supply: Use the input from the power supply that is powering the

  measurement circuitry to also power the load.

  - 3V3: Use the onboard regulated 3.3 V rail to power the load.

  - Test Input: Use the external test input to power the load.

- **To Load**: Connect to VCC or the signal you wish to measure.

- **GND**: A set of ground pins for convenience.

Errata

------

The 300 mA range doesn't seem to work on v3.

----

V2 Notes

--------



You need a power selection jumper. You usually want to power the board externally,

in which case you'll want the jumper in the high position as pictured.

 - Connect external power (3.3-6V) to the EXT header at the top right.

   I usually also connect the external power to the GND header up here.

 - Connect the power supply for your target to VIN header.

 - Connect the VCC of your target to the VCC header

 - Connect the GND of your target to the GND header.

   I usually connect target GND to the GND header at the bottom, whose label is

   occluded by the screw.

 - Hook the scope probe to the test point at the top left (and GND anywhere)

 

The rest of the board is the same idea as above. Choose a range, measure voltage,

divide by the number on the board, get amperage.