How To Connect A Vibration Sensor Like LDT0-028K To MCU On PCB?

Projects General Guidance
21

Does that work at all with a piezo disk?

Consider the LTC3588, which is specifically designed for energy harvesting from piezo elements, using a full wave rectifier to charge a capacitor.

Actual harvested power is typically in the range of nanowatts.

22

I actually ended up doing that.

Thanks

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23

I saw that one, yes, however, it doesn't seem to allow me have the type of setup I want. For example, low output current, it only does buck conversion and my main thing is I want the storage element powering the load all the time basically then the energy harvesting to charge the storage element instead of the way something like AEM10941 would do it that the energy harvested goes to load and if there's extra, it goes to storage element.

24

I doubt that is possible. Please answer the question I posted above.

25

The biggest one I linked to is 59mW. Close to $400 though.
That's a lot of walking (170 hours) to charge an average 10Wh18650 lipo cell.

26

I was referring to the 20 mm piezo that the OP linked and the LTC4070, but agree that nanowatt was a poor choice of unit.

Microwatt is more appropriate, although I would like to know if any useful power could be harvested using the LTC4070 with the 20 mm piezo.

27

Maybe with a vibration motor attached to it, but not with the relative slow movements of a human body.

28

it will be a good learning experience!

29

Perhaps, but I suspect the OP will soon loose interest if he ever gets to testing his project.

30

I probably won't. I have been interested in energy harvesting for over a year now.

It's mostly been solar (indoor especially) that I've worked with but it seems piezo is more complicated than I thought.

31

I know energy harvesting like this can hardly achieve energy autonomy. I would want to investigate if a battery's life can be extended at all.

But, I concede on this topic, I'll drop it. Probably work on a TEG module next.

32

Hi,
There are ICs out there;

Key features and benefits

  • Optimized to efficiently harvest energy from a wide range of ambient sources (light, kinetic, temperature variations, radio signals)
  • Unique inductorless design allowing a reduced BOM cost
  • Ultra-compact chips with <20 mm2 assembly area
  • Designed for low-power applications
  • High power conversion efficiency
  • Ultra-fast MPPT, adapts within up to 0,5 second
  • Basic power management features (e.g. battery protection, USB charging, LDO)
  • Suitable for a wide range of storage elements as well as batteryless designs thanks to cold start

Tom.... :smiley: :+1: :coffee: :australia:

33

Another dead end, with a human as the heat source. Another great learning experience, though!

35

Human body heat is how I got interested in energy harvesting, but no, I don't think I'll optimize for body heat. Maybe you use whatever heat source you want on one end :joy:

36

This lowkey looks promising, thank you.

37

I have a night light in my lounge with an 8mm strawhat LED.
Running all night at 20mA (more than 12 hours in winter).
The solar panel is 4volt, 10x10cm, taped flat to the window.
The battery is a 1Ah LiFePo4.
It has a DIY shunt regulator, set to 3.45volt

Running more than 3 years now without missing a beat.
Full brightness every morning even after a couple of dark winter days.

Solar is the way to go, even on humans (solar caps, Flexible panels, etc.)
A shake generator (coil with moving magnet inside) is another alternative (shake flashlight).
Reminds me of the fifties, when I had a "knijpkat (squeeze-cat).
Leo..