Correction: Device not working

Today I spent a lot of time debugging my device and found out that my device is not functional. I realized that I made a mistake in reading the schematics and placed the stuff that was meant to be on pin number 5 on pin number 8. After fixing this I still find that the device is not working. I troubleshoot the piezo-electric film and find that its working, so I use an audio-jack as a wave-form generator and oscilloscope. I also found that I will need a capacitor to bypass the ports one and eight to get the required output for pulse. At the end of all the troubleshooting I find that my Op-amp is fried.

Device is working

The pulse collection device is now working, however my PC’s audio card is refusing to accept as an audio device. One thing that could be a cause is that I may need a second stage amplifier. I came to the conclusion after using a multimeter to measure the voltage. The multimeter seems to respond to me when I hit the piezo film however the output voltage is very low. This is a major set back in my project as I need a working device in order to collect pulses for my report.

Meeting #2 with supervisor

I have completed my 2nd meeting with my supervisor. The outcomes of todays meeting were:

  • Power and test the device.
  • Do some research on pulse and its uses.
  • Start design specification for the report.
  • Decide on date for next meeting.

My plan is to complete the power on of the device by 30th of august. Complete research on pulse by 7th september and complete the first draft of my specifications by 14th september.  

Sparrow 112 and Rex 1

Over the weekend, I and my younger brother built 2 mini-planes. I have an intent on putting light weight engines on these currently gliders. The sparrow 112 is like any other plane, it has straight wings and a tail much like a modern airliner. In the front it has a nose cone with loads of play-doh stuck on to increase it weight. The motor of the sparrow 112 will be located inside the fuselage. Its specifications are as follows.

Sparrow 112

  • Wing span: 45cm
  • Fuselage Length: 35cm
  • Fuselage Height: 5cm
  • Wing type: Straight
  • Tail stabilizer: 18cm
  • Fuselage width: 6cm
  • Tail fin height: 5cm
  • Engine: Compressed Air / none
The other mini-plane we built is Rex 1.  Rex 1 is a delta wing craft that is very light weight. It is kind of like a flying wing. The rex 1 will use ducted fans that are hidden in the fuselage section. Rex 1 also has its direction control inside the fuselage.
Rex 1
  • Wing span: 30cm
  • Fuselage Length: 15cm
  • Fuselage Height: 4cm
  • Wing type: Delta
  • Tail stabilizer: 18cm
  • Fuselage width: 4cm
  • Tail fin height: none
  • Engine: Ducted electric fan / none

Compared with sparrow 111, Rex 1 does show better performance in all areas. However, sparrow 111 is larger in size. These planes can be fitted with payloads.