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AVR Programming Guides
We have some nice AVR code samples to share. Lots of AVR goodies like timers, interrupts, and pin I/O for the beginner. |
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Watts Tables
Use these tables to help you determine how much various items in your house cost you by the day, month, and year. |
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Saving Electricity
A list of a variety of ways to help you save money by learning how much it costs to run things. |
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Read Your Power Meter
By reading your power meter you can get a good idea of how much various electrical devices cost you. |
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Common Schematic Symbols Page 3
LED
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Actual Image
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This is the schematic symbol for an LED, or Light Emitting Diode. You can pronounce LED as "el e dee". An LED is very similar to a light bulb, except it uses much less energy to make it light up. The biggest difference between an LED and a light bulb is that an LED is polarized. This means it will only work if hooked up the correct way. This is covered in detail in the LED Guide. Pictured are 3 clear LED's of different sizes.
Notice that the LED legs have different lengths. The longer leg is the more positive side (+) and the shorter leg is the more negative (-) side. In the schematic there is an arrow with a line on the tip. The tip of the arrow is the more negative side while the back of the arrow is the more positive side. Again, this is covered in more detail in the LED Guide.
Resistor
| Schematic Symbol |
Actual Image
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Here are is the schematic symbol for a resistor. Resistors are not polarized, so you can hook them up either way. This is evident in the schematic. Notice that both sides of the resistor are the same. There is no way to determine orientation from the schematic because it does not matter.
In the picture next to the schematic there are 3 different resistors to show that they have different colored bands on them. These colors help you to tell the resistors apart. We cover this in detail in the Resistor Guide.
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