last day of this project

  Today is the end days of this project. In this case, we begin to prepare the final test. Last week, we finish the first parts of this circuit, so this week we should do the other parts of this circuit. the professor yan suggest we should record the diagram and finish their works. In the meantime, he say our first circuit's diagram has some problem, we need to change the oscilloscope and set the correct frequency.

  this weeks the abanoub miled has joined us. Even if he can not give us many help, but we are happy to do this week's project together. However, from the suggestion of the AA, we reduce the frequency of oscilloscope. last week's waveform like a straight line. however, when we reduce the frequency, the waveform outputs like the following figure 1. when we pass through the re200b, the line will up and down a little. 

               

                         Figure 1

Then we finish the other parts of the circuit. we check the circuit again and again to ensure the components' connection. The final circuit is like figure 2.

              

                        Figure 2

Of course, we test the second parts of circuit. When we pass through the re200b, the circuit can output the waveform like figure 3.  

              

                       Figure 3

The waveform like a sine wave. when we leave with re200b, it became a straight line. In the end, we can not get the correct output from the final circuit. when we test the tired circuit, the output waveform like the figure 4.
                

                      Figure 4

It has some problems in the process, but we have no time to solve this problem. we can not get the correct waveform in the final. 

the fouth week of this project

  Before this weeks lab, boyue and xiaokai are going to ask for doctor yan's help. he suggested our group should check the connection of this circuit. Maybe some problems excited in the breadboard. the other is this project can change the values of the electronic components. From this suggestion, we began this week lab.

  first, we design to check the first part of our circuit. it cost to much times in it. Finally, the circuit link and the voltage is normal, but RE200b did not work weather we touch or pass through it. in this case, we have to build the circuit again and change it little. the whole circuit divide into 3 parts from the difference amplifier and build it in difference breadboard. In this way, we can check the parts of the circuit and find the detail problem in this project. However, the first part of the circuit use the amplifier to the signal. the result is like the following picture. 

this is the two picture about the oscilloscope screen. As we can see, when we pass through the re200B,it has a little change in the process. when we touch the re200b, the oscilloscope screen like following. 

The difference is more obvious. our project has succeed in first part. Maybe next week we can finish it and go to test. 

the tired week of project

  In this week, our group begin to try another circuit. However, our teammate Abanoub Milad has not joined in this week's experience. This is the second time that he absented the experience. in this case, this week, our group has only two people to build the circuit.the figure 1 is our finally circuit what we build this week.

figure 1

when we connect the energy source and oscilloscope. when I skim over the RE200B. Oscilloscope's output only have a line. they did not have some change. Then I touch the RE200B, it can change a little, but it did not meet requirement. in this case, we began to test the amplifying circuit. we connect the oscilloscope in the first LM324. However, it output like the finally output. we must check the circuit again. In Multisim software, I build the circuit to simulate. The circuit is figure 2.

figure 2

In the end, we get the simulate result like figure 3.

figure 3

The output is like our output in experience. in this case, we must check the circuit again. the time is not more. our group must check quickly and get the correct answer.

the second week of this project

This week, the tutor suggests our group to begin to build the circuit first. The RE200B is hard to simulate in the Multisim,so we decide to build it first. Through the effect of morning, the circuit has been finish. we connecct the energy sourse and oscilloscope with the circuit. when we set the voltage to 12v  and adjust the current. however, because of the teammate's faults, the circuit's current has became too big. In this case, the diode has an explosion in the process. our circuit has some lines has been in the wrong place. in the meantime, the current is too big to adapt the electronic components.
 From this problem, we check the circuit and test again. in this case, we fail again. the oscilloscope can not output the screen of the RE200b.
From this case, we have to change our circuit again. the final circuit is like the picture 4.

first week of project, prepare for working.

the first day of this experiment, our group only has two peoples. We get the experiment's instruction and check the instruction's function. Our project is about the infrared sensor. it's function is used the oscilloscope to output the signal from the infrared sensor. The process is liked the picture 1.

picture 1

 We uses the RE200B to test the project. The whole project has included the amplifier and compactor. The infrared sensor gets the light and sent the signal to the circuit.The whole circuit is liked the picture 2. In this case, the group should design the circuit about it.

picture 2

  Then the circuit has been designed and begin to simulate this. however, it did not work. Maybe we should check this again in next week. The circuit has been followed in picture 3. In next week, our group begin to check again and begin to build the circuit.

picture 3