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Sergey_new_pcb
23:45:06 Tue
Feb 18 2014

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287 posts
BBMG Major General **


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Re: Drozd Blackbird "Sergey's board - 2" (9-24V, 400-2000 RPM, Full auto, 4-12 m

Hello everyone.

It's been a while since I posted to this thread and I'm glad to be here again.

Gentlemen, I need your opinion.

I receive messages from time to time in which Drozd/Blackbird owners ask for voltmeter to check batteries condition. Each time I receive a message like this I need to explain that this task cannot be done with "just a voltmeter". It's because the current drawn by Drozd/Blackbird is not smooth. It's graph looks like saw teeth. Conventional voltmeters demand that voltage remains stable for at least 1/3rd of a second to measure it precisely.

In order to prevent your batteries from over-discharging we need a comparator or digital-to-analog converter (DAC) fast enough to register short but deep voltage drops observed at the peak current consumption moments. Then, I think we don't need any display because when you're not shooting the battery isn't loaded, it'll be even worse to watch some display while shooting. I think we need to use a buzzer instead of a display.

We also need some hardware/software to stretch those beeps (up to 0.5-1 sec) so they can be heard more easily after you release the trigger.

Finally, different users will need those battery monitors with different threshold values. I guess I'll have to add a small 3-pins connector for two detacheable buttons (up and down) to give the user ability to adjust the tripping point using a conventional voltmeter or multimeter. I will be able to ship those little circuits pre-adjusted to a certain value specified by the customer.

Now, the main problem for me is that I need to try to estimate future demand for circuits like those. I guess its price will be about $60 including shipping from Russia to US/Canada (please understand that it's not that I'm too greedy, it's the circuit being too specific so it will never be sold in volumes like hundreds of pieces and R'n'D cost won't spread around these quantities).

Questions for you:

Do you like the whole design idea? Do you care about your battery condition/endurance that much?

If you'd agree to pay $60 or so for the circuit like this, please let me know -- I need to have at least preliminary number of potential customers before I start working on it.

If you're not a member of this forum, you may want to send your opinion to my e-mail: e-go [you-know-what] inbox [dot] ru

Thanks.

Yours,
Sergey.

  
Mood:

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