Ultra low power energy harvester from BPW34

super small and durable power supply for wireless nodes

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Thanks to the ultra-low power design it works under indoor lighting conditions.
red flashing LED now only

size is about 30x30mm

I want use this circuit to charge larger capacitor and then powering wireless node

Idoor voltage is about 1V with only 1uA

Harvester work as charge pump, multiply input voltage twice to get 2V pulses

2V is enough to powering micro-controller

sch - 722.98 kB - 06/12/2018 at 20:33


brd - 117.38 kB - 06/12/2018 at 20:33


  • 4 × BPW34 Opto and Fiber Optic Semiconductors and ICs / Photodiodes
  • 2 × Resistor 1M
  • 2 × Resistor 23K
  • 1 × Resistor 22R
  • 1 × Transistor NPN

View all 8 components

  • Prototype testing board

    bobricius6 days ago 0 comments

    After breadboard success I designed first application .... flashing heart, first batch was just only garbage due mistake in design.

  • Harvesting test

    bobricius6 days ago 0 comments

    As you can see on first video, led flashing in room light.

    Power output is short 2V pulse.

    I created all on breadboard and about month experimentally adjust components values to get best performance.

    Charge pump schematic.

View all 2 project logs

Enjoy this project?



Stephen Tranovich wrote 03/21/2018 at 20:47 point

This is awesome! I can't wait to see what you power with this project!

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