Experiment with Lux Meter

Recently, I was working on a energy harvesting experiment where I was trying to test various solar cell with indoor lighting conditions and was also checking how much is the light intensity at various location in our office using Lux Meter.

Experiment with Lux Meter 1

I got curious and quickly created a setup to test the power consumption of the Lux meter.

I was surprised to see the power consumption.

Experiment with Lux Meter 2

Let me show you how I set it up.

I removed the cells and I used Owon Power Supply to give 4.5V DC as you can see Lux meter uses 3x AAA cells which will produce 4.5V

Experiment with Lux Meter 3

In the series, I connected NanoRanger to measure the current accurately.

Experiment with Lux Meter 4

I was surprised to see it was consuming a few 10s of nano amps and not even a few uA. that’s like a very good design.

See the short video clip.

Consuming ~20mA while in active mode and then when in Standby or OFF condition get back to nA 🙂

Whenever designing a battery powered equipment and have a power off mode, make sure you have least possible current consumption when in stand by / off mode (if not possible to make it zero).

I have seen many instruments / products consume 10 to 100s of uA while in OFF/Standby mode. You can check my video on Fluke Multimeter I did couple of months back.

This was a quick experiment and I thought it would be interesting for you to also know the results.

If you are also working on energy harvesting or battery powered product, I would love to speak to you.

I hope you found this post useful.

If you have any feedback, you can share in the comments section or you can also contact me directly.

Read more interesting articles on Embedded Systems Design.

If you need help on custom embedded product development, do reach out to me.

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