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Step 2Prepare the circuit
Now that we have all of the parts, we can start putting things together. I recommend you put everything together on a breadboard first, this will make it easier to program the microcontroler and you can get a feel for how the circuit works before soldering anything together.
The parts should be placed according to the schematic I have attached, it's a pretty simple design. The big block in the center is the AVR, and the number beside all of the wires coming out of it corresponds to a pin. To figure out which pin is which, look at the microcontroller. You should notice a little circular indent beside one of the corner pins, this marks pin one. You count the pins going around the chip in a counter-clockwise direction starting here. In the picture the part marked G1 is the battery, C3 is the 0.1 uF capacitor, C1 and C2 are the 18 pF capacitors, Q1 is the crystal, and SP1 is the speaker. All of the GND's connect together (to the negative terminal of the battery).
The parts should be placed according to the schematic I have attached, it's a pretty simple design. The big block in the center is the AVR, and the number beside all of the wires coming out of it corresponds to a pin. To figure out which pin is which, look at the microcontroller. You should notice a little circular indent beside one of the corner pins, this marks pin one. You count the pins going around the chip in a counter-clockwise direction starting here. In the picture the part marked G1 is the battery, C3 is the 0.1 uF capacitor, C1 and C2 are the 18 pF capacitors, Q1 is the crystal, and SP1 is the speaker. All of the GND's connect together (to the negative terminal of the battery).
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