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0 pointshansc12y ago0 comments

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.

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graphene12y ago· 1 in thread

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?

hanscOP12y ago

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.

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