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Comment by hansc | Hacker News Reader

Love to hear your feedback and reactions

Nice read, thanks for sharing.

As an arduino noob, it wasn't clear to me why you need a resonator component, especially since it isn't present in your first schematic?

Also, have you given thought to what happens after the battery runs out? Can the battery be replaced by the customer or does the device need to be disposed of?

Thanks for your reply.

The resonator is shown in the 'Eagle schematic', right in the middle of the picture. The first schematic is just for the moisture sensor. I used it as a crystal to run the ATMEGA.

When the battery is gone, you just pop open the enclosure and put in a new CR2032 coin cell battery. You can get those at every gas station or supermarket.

Please bear with me, I'm new to Arduinos/uCs..

So an ATMEGA uC needs an external oscillator to run? Is it to provide the clock signal or for something else? If so, why doesn't it have its own clock signal generator? Wouldn't it always need one to run at all?

The standard bootloader needs a resonator or crystal to run the oscillator. You can also program a bootloader which uses the internal oscillator in the Arduino IDE, in that case no resonator or crystal is used, like I did with the attiny.

Safari 7.0 on OS X 10.9 - I can't add a pre order to my cart! The green circle flies up but the cart remains at 0. Works fine in Chrome.

Edit: Also can't check out in Chrome… just sits in 'Completeing Order'

Thanks for the feedback! We use shopify, will contact them about it.

Are you using Shopify with a custom theme? I recommend starting with one of their stock themes - those should work well - and moving to a custom theme once you have more expertise. :)

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