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ejgertz / AMWA

Atmospheric Monitoring with Arduino
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5v power is needed for supplied LCD not 3.3 as stated #2

Open hubertron opened 11 years ago

hubertron commented 11 years ago

In the code you stated the needed for a 3.3v power supply for the LCD provided when in fact you need to supply it 5v. Please revise your documentation.

ejgertz commented 11 years ago

Hi,

Thanks for these notes. We'll take a look.

Cheers,

Emily Gertz

On Mar 9, 2013, at 6:11 PM, hubertron wrote:

In the code you stated the needed for a 3.3v power supply for the LCD provided when in fact you need to supply it 5v. Please revise your documentation.

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ejgertz commented 11 years ago

Hi Hubertron,

We're sorry you're having problems. But we haven't been able to replicate the problem you've described (i.e., the LCD requiring 5 volts to work). The LCD described in the documentation definitely is a 3.3 volt model.

It's possible the model of LCD you have is different from the one that we specify in the book. Or even that the one we specify has been changed since we first wrote about it; that can happen with some electronics components, and of course it's beyond our power to account for it in the original instructions.

You can probably power a 3.3v LCD with 5 volts, but we wouldn't recommend doing that -- the higher votage will almost certainly damage the component with prolonged use. And in our experience, there have been no problems powering a 5v LCD with3.3 volts -- again, it's probably not the best thing for the component, but it works, with the only drawback being a slightly dimmer display.

Thanks for contacting us, and we hope you enjoy the book. If you make anything new and exciting based on one of the gadgets, be sure to let us know!

Patrick & Emily

hubertron commented 11 years ago

Hello Patrick and Emily,

The LCD provided in the MakerShed kit: http://www.makershed.com/Atmospheric_Gas_Detector_Kit_p/msatm2.htm is this http://www.seeedstudio.com/wiki/index.php?title=Grove_-_Serial_LCD which as you can see hasa 5V power requirement.

The book was provided as a downloadable PDF from MakerShed, so it could easily be updated if the kit it is bundled with changes.