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CurrentRanger
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Per Mårtensson 84ad82eedf Change the timer trigger to embedded keypad for nextion %!s(int64=3) %!d(string=hai) anos
include 0fc0644123 first commit %!s(int64=3) %!d(string=hai) anos
lib 0fc0644123 first commit %!s(int64=3) %!d(string=hai) anos
nextion 84ad82eedf Change the timer trigger to embedded keypad for nextion %!s(int64=3) %!d(string=hai) anos
src 84ad82eedf Change the timer trigger to embedded keypad for nextion %!s(int64=3) %!d(string=hai) anos
stl a53884b1ed Added STL file for the front and back for the box %!s(int64=3) %!d(string=hai) anos
variant 0fc0644123 first commit %!s(int64=3) %!d(string=hai) anos
CurrentRanger.code-workspace 0fc0644123 first commit %!s(int64=3) %!d(string=hai) anos
README.md eef6c0774f Updated README %!s(int64=3) %!d(string=hai) anos
platformio.ini cf41045ab2 Added timer and statistics %!s(int64=3) %!d(string=hai) anos

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.

2021-02-11 Added support for a timer that is trigger on going over a current setpoint. Added support for min and max values and prepaired for avg values.

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