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Árbol: cf41045ab2
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CurrentRanger
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Per Mårtensson cf41045ab2 Added timer and statistics hace 4 años
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README.md

CurrentRanger

Precision auto-ranging current meter (ammeter)

This is my fork for adding a nextion display into the oled header. The variant files need to replace the orginals by lowpowerlab for the board definitions. The changes is to replace the i2c setup with a serialport.

Please see the full guide and latest updates posted here.

CurrentRanger

Quick Highlights

Here are some of the features of this instrument which sets it apart:

  • Low noise zero-offset with 3-ranges (1mV output per nA/µA/mA)
  • Low input burden voltage, high precision & bandwidth analog outputs
  • Increased flexibility and usability with several input and output terminal options
  • Auto-ranging capable
  • Use standalone with a small OLED display or with a multimeter/oscilloscope
  • Ultra fast range switching between any ranges (even nA to mA) without any glitching/bouncing of a mechanical switch
  • Low Pass Filter mode – very useful to capture low noise signals on oscilloscopes
  • Unidirectional mode – most used mode in measuring DC currents ranging from [0, 3.3A]
  • Bidirectional mode – split supply biasing allows AC currents measurement ranging from [-1.65A, 1.65A]
  • LiPo battery powered – long life and extended measurement range
  • Auto-power-off
  • Full digital control for power & range switching via touch pads
  • OLED display option to read output with usable precision
  • Datalogging possible via Bluetooth serial module
  • SAMD21 Cortex M0+ powered, change firmware to your needs

  • Optional buzzer for audible feedback

  • Current ranges output:

    • 0-3300 nA/µA/mA (Unidirectional mode)
    • +/- 0-1650 nA/µA/mA (Bidirectional mode)
    • Burden voltage:
    • 17µV/mA
    • 10µV/µA
    • 10µV/nA

  • Output offset voltage¹: typically <10µV, max 50µV

  • Maximum input voltage differential (see Safety): 33mV

  • Accuracy:

    • +/-0.05% (µA, nA ranges)
    • +/-0.1% (mA range)

  • Highest resolution (nA range):

    • 100pA (3.5digit meter)
    • 10pA (4.5 digit meter)
    • 1pA (5.5 digit meter)

  • Cascaded MAX4239 amplifiers with 100x output gain

    • Bandwidth: >300KHz (-3dB)

CurrentRanger

Sample no-load mA range comparison to µCurrent GOLD: mA compare µCurrent

Sample measurement of a Moteino waking up and transmitting a RFM69 transceiver packet:

CurrentRanger