Friday, October 15, 2010
Thursday, October 14, 2010
Day 11
We managed to discuss everything about our report and it's almost done!
now,just going to focus more on preparing the slides for our presentation.
now,just going to focus more on preparing the slides for our presentation.
Wednesday, October 13, 2010
Tuesday, October 12, 2010
~Day 9~
After what had happened yesterday, I spent 3 hours to reconstruct our circuit and make it neater. It did not turn out well when I tested with the 9V battery.Only one LED lighted up. I decided to bring it to class and discuss with Shahirah.
Apparently, it was our 555 timer that caused the problem. We changed the IC and the circuit is finally working!!
However, the time delay was fast. The question requested it to have a short pause of 3 seconds. But we are having less than 1 second's delay.
We googled up and finally found the way to solve, it was the resistors and capacitor as shown below that control the delay. 555 timers
After several trials, we changed the values of both R1 and R2 to 100kohms and C to 10microA. Finally we got the desired result.
Apparently, it was our 555 timer that caused the problem. We changed the IC and the circuit is finally working!!
However, the time delay was fast. The question requested it to have a short pause of 3 seconds. But we are having less than 1 second's delay.
We googled up and finally found the way to solve, it was the resistors and capacitor as shown below that control the delay. 555 timers
After several trials, we changed the values of both R1 and R2 to 100kohms and C to 10microA. Finally we got the desired result.
Monday, October 11, 2010
Day 8
Today, we learnt more about our circuit..1st of all, we had tried to run our circuit..
but we found out that our circuit did not meet the need of the question where a 3 seconds of delay was needed. so,we modified our circuit by adding a 51k resistor and all the 9 LEDs lights and then stopped for 3 seconds.
Unfortunately, there's another problem..our LED was not functioning properly. There were certain possibilities :
1) either the LED was burnt..or
2) the 4017 counter had damaged.
We are still finding out of what is wrong with our circuit.
At the same time, today we discussed about the details of our report..trying to finish it up sooner..=)
but we found out that our circuit did not meet the need of the question where a 3 seconds of delay was needed. so,we modified our circuit by adding a 51k resistor and all the 9 LEDs lights and then stopped for 3 seconds.
Unfortunately, there's another problem..our LED was not functioning properly. There were certain possibilities :
1) either the LED was burnt..or
2) the 4017 counter had damaged.
We are still finding out of what is wrong with our circuit.
At the same time, today we discussed about the details of our report..trying to finish it up sooner..=)
Sunday, October 10, 2010
Day 7
Hmm..today we managed to run our circuit using our own breadboard..
at the same time, we were searching more information about sequencer,timer.. setup time n so on..since we haven't really learn about that in our lecture.
I think that's all..till then sayonaara =)
at the same time, we were searching more information about sequencer,timer.. setup time n so on..since we haven't really learn about that in our lecture.
I think that's all..till then sayonaara =)
~Day 6~
Today is day 6 of our project.
After trying to connect the circuit in the lab yesterday, today we spent our time troubleshooting the problem we faced.
We try to connect it in a project board. But we just can't get the result.
After trying to connect the circuit in the lab yesterday, today we spent our time troubleshooting the problem we faced.
We try to connect it in a project board. But we just can't get the result.
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