Power analyzer, DC power supply, data recorder


665 in stock


Power supply, monitoring and analysis in one easy to use and feature-packed product, the Otii is the ultimate tool for any developer aiming to design highly energy efficient IoT projects.


Connect Otii Arc and power your device directly to the DC input or battery connectors. It will act as both an up to 5V DC power supply and high-resolution voltage and current measurement unit.

Otii software will give you real time measurements and generate statistics based on the entire data set or small subsections even during the recording process. You can record and compare the changes in energy consumption due to changes in your software and hardware in one and same Otii project. Share the data with team mates and suppliers.


  • Records currents, voltages and UART logs and displays them in real time as charts and interactive measurements and comparisons
  • Recordings synchronized with UART debug logs
  • Enables long continuous recordings, recording time limited only by computer storage
  • Sample rate of up to 4k samples per second.
  • Measurement range of <100nA-5A. Requires an external power supply if going beyond USB capabilities. Note: If using a Yellow USB port or with a lightning symbol, often they can power up to 1500+mA without the need for an external power supply. Check your USB port power limits for more info.
  • Data + Power via USB. 2.1mm DC jack for external power
  • ADC subsystem measurements with differential measurement range of -81.9175 mV to 81.92 mV
  • Two General Purpose Inputs
  • Two General Purpose Output
  • Two Sense pins that can be used to compensate for voltage drop in cables or as extra voltage sensors
  • Monitor multiple projects and Otiis from the same computer
  • Crop, downsample & share

Today, based on statistics, tighter calibration limits and updates in the firmware, we can proudly announce an update to the technical specification.

The new accuracy for current measurements is (0.1% + 50nA) for currents below 19mA and (0.1% + 150uA) for higher currents. The new accuracy for voltage measurements is (0.1% + 1.5mV)

Previously we have stated (1% + 0.5uA) for current measurements and (1% + 10mV) for voltage measurements, so we are delighted with the improvements!

Also recommended (for basic use):

  • IC Clips these will fit into the Arc black and red outlets, which then connect to your device under test. You could use any standard banana plug style connectors though.
  • If available, use a Yellow USB port or one with a lightning symbol to increase the power supply limit from 500mA to 1500mA (sometimes, these ports can go up to 3Amps).

Also recommended (for advanced use):

  • If you are powering devices beyond USB power constraints and would like to interface with the 14 port header, then read on.
  • 27W Switch Mode Power Supply set this variable supply to 7.5 Volts and your Arc will be able to power the device under test well beyond the USB limitation.
  • SMD Clips and Through Hole Clips (Red / Black) the 14 pin connector on the Arc has standard 2.54mm pitch, so you can use any female headers and crimps to make your leads to suit your project along with stranded wire for better flexibility.

USB Type A Female Breakout this is a useful combination for USB device testing. The female connector can then be used with any Type A cable, which adapts to a Micro B or other popular USB variants. To enable Otii Arc to power 5V devices, in the projects settings menu, disable Current Auto range . This will unlock the main voltage from 4.55V to instead be 5V back on the Supply tab for your project setup.


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SKU: 1923400 Category:

Power analyzer, DC power supply, data recorder


665 in stock