where did you find the 555 timers. all I get is a transistor layout of 555.
Click on the little AND gate in the Toolbar. The Symbol window opens. Normally you would choose one of the standard symbols, like an NPN. Instead, double click on [misc], which pushes down one level in the heirarchy to some miscellaneous symbols, including the NE555.
and what to do to get the wave forms to show up??
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You have to choose one of several analysis methods by clicking on the "SIMULATE" menu, and selecting "EDIT SIMULATION COMMAND". I used a time-domain transient analysis. Look at the schematic, and you will see ".Tran 2" on the page. This tells LTSpice to simulate the circuit for 2 sec.
I set up the independent variable V2 (which is not a real voltage; it is just used to control the voltage dependent resistor R2 which is the light sensor. During the 2 sec simulation run, I ramp the "light level" up for the first second, and back down for the second. This creates a voltage which triggers the first 555.
During any simulation, LTSpice will display the voltage at any circuit node, the current through any component, the power dissipated by any component via a powerful waveform viewer.
Anybody that wants to get familiar with LTSpice should sign up for the Yahoo groups LTSpice Group.