The 555 Timer is different from other microcontrollers in which it fires electric pulses in order to keep track of time. The way it works is that a capacitor is filled by a resistor and then emptied out by a different resistor. Depending on your arrangement, you can increase the frequency of the pulses by changing one of the resistors for a pot or replacing the capacitor with a different quantity.
An Oscilloscope is a tool used to see the signals at different points of the circuit. When seeing the grid, it will tell whether the ciruits are correct. On the screen a V/t graph is drawn so it shows voltage vs. time.
There are three modes in which the oscilloscope works: channel 1,2, and dual mode. Channels 1 and 2 can be setup independently and "dual" allows for side by side comparison of signals. Normally you dont get what you see in the picture bellow, so you have to do a little work to see the signal pattern.
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| 10K pot (blue), piezo (round sound emitter) |
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