~Going in Lab II~ (12/10/2010)

Author: Our Diaries // Category:
It is our turn to test the circuit. 

 After connect the positive terminal to a power source of 12V and the negative terminal to ground, we turn on the switch.......

ERmmmm......The result is ..... 

      Red LED turns on but Green LED does not turn on.
It meant relay does not work!

Sigh....we have to troubleshoot the circuit.  At first, we thought that it is the relay problem. However, we realized that we had made a mistake in the construction of circuit. The relay is not connected and thus cannot be switched on. We finally successfully troubleshooted our circuit and the relay can be switched on already.
 

The following is some simple and general analysis about our circuit :

When we switched to A ( assumption), the relay is switched on when the LDR is in light condition; when we switched to B(assumption), the relay is switched on when the LDR is in dark condition.

 The next step is to solder all the components in a copper board. Let's fight for our project~~

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