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Day of Flight - 30/10/2008

We meet at school early to prepare the last details. Rescheduled some PIC 's charging them programs made the night before, hoping that some of them can make the flight.
After the trip about an hour and a half, we came to San Vicente where we met with two schools more and different members of the ACEMA .
The land belongs to William Barefoot, also a member of the ACEMA .
soon as we arrived we set up the tent would put all our instruments. Once unpacked
all brought the bus, witness some shots from his total success until destruction on the ground.
Later, along with Leandro Arcusin we set out to test the emergency programs made the night before.
At the beginning and without knowing why, the PIC 's too hot to connect on the plate and apply pressure . That is why we redid the auxiliary connections (cables and resistors were added at the last moment in a rudimentary way) with more care.
The connections consisted auxiliary cables and a resistance directly out of the shafts used for power (bronze long screws that pass through all the plates) and were to some port PIC to return in the same way the other axis.
After this touch, the auxiliary program HPWM 8 began to function properly.
The way we use to detect the operation, was used a satellite created by students from 4 to year electronic who came with us to the field. This antenna received a signal and a tone emitting the same frequency headphones. That way when varying the pressure , varied sound. The higher was the rocket should sharpest tone sounds of the antenna and the more bass, more serious.
Happy with what we were able to improvise, we went to lunch a good roast.
After lunch, we continue giving final touches to the plate. Our biggest challenge
, was to assemble some kind of sensor that allowed us to detect the launch. To do this, use two metal contacts , separated by a makeshift insulation cut. This cut through a wire, the rocket went out and tied to the base, so the rocket takeoff tear the insulation and the two plates enter into contact, detecting and takeoff. This task was not easy because we were constrained by the structure of the rocket and the absence of a strong thread to pull takeoff. Such was the uncertainty, we did not know if it would work until the time of takeoff. When the time
take-off of our rocket barely throw the absence of heads that fit into our rocket. After solving this problem, we take up the launch base, place it and retired to a safe distance.
The launch was a success and we hear the rise and fall of the rocket through the antenna named above. Happy
so accomplished, we returned to school, finishing the day not the best way (because we preferred to shoot the rocket program), but still happy. I can see some photos of this memorable event:

Preparing the "fuel" of rockets.

Armando carp Maravankin points us to the North.

Secrets MEETING ON bad education.

One of the takeoffs.

roast.

Leandro Thanks for everything you taught us.
With love and Wajs Mati.

Students who made the antenna ... and antenna.

Ezequiel Leandro and putting the finishing touches. Matias
monitors than any asteroid we ruin the evening.

All.

to get our share here in CanSat project, begun in March and carried out throughout the 2008 school year. We are grateful to our teachers Edgardo Baez, Leandro Mariano Arcusin and Foullier by knowledge and good humor transmitted to Nostra. Close this time that was certainly rewarding for us hope that this blog is useful for anyone who needs it or find it. Without more we take for closing this blog that contains all of our experiences, successes and failures.

Maravankin and Matias Ezequiel Wajs.

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Night Pre-Flight - 29/10/2008

We meet at the house of Ezekiel the night before the flight to see if we could do something useful before the flight and to give it a culmination of hard work this year. That is why we stayed until the wee hours preparing some "emergency program" to avoid the use of division and multiplication. The programs were much simpler than the Final Programme V3, but we expected that even fulfill their purpose. This is why it emerged that night 3 programs:

• HPWM10

The program takes a measurement in 10 bits, the output from a PWM, where the frequency of is 1000 plus 2 times the measured data (as in the protocol), also reduced to 8 Bit's using a very crude operation (as had been right to divide the data by 4) and stored in the EEPROM.

• HPWM8

The program takes a measurement of 8 bits, the output from a PWM, where the frequency of this is 1000 plus 4 times the measured data (similar to the protocol) and then stored in the EEPROM. Storage

The program takes measurements and stores 8 bits

programs here: Last Chance

* Note that to avoid multiply add several times the record.

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thirty-second day (32 º) - 10/24/1908 Thirty-first Day

The 30/10 would be the rocket that would launch the final program that we have been preparing throughout the year (not literally preparing the program and develop it in the last month, but this program is the culmination of learning all the programming that we tested during the year). Edgardo
told us he was not very satisfied with working ranges with our board altimeter and preferred use of last year that had included a regular potentiometer allowing the output range. That is why we use the same method explained in the previous post to calibrate the altimeter old, we get a range down to the 5V (Limit Analog-Digital converters CIP) and started from a lower voltage than the Altimeter manufactured by us. We set out to record 5 PICs, 2 with auxiliary programs which merely transmit antenna the data that were measured (in 8 Bit's, to simplify the operation, since it is only an auxiliary program) already stored in EEPROM and other 3 with the main program contains the following functions, all integrated and funcionamieto quasi-simultaneous:

• Recording in 10 Bit's (1024 possible values)
• Detection and Warning Takeoff and Height Measurement Home
• Averaged Data (He makes an average of 3 consecutive data, low error)
  
• Data Processing (For program ground level becomes 0)
• Data Processing for Streaming RF (To adapt to the Protocol)
• Data Processing for Storage (Reduced to 8 Bit's)
• Saved Data in the EEPROM (8-Bit's)
  
• Apogee Search (constantly chequenado ballistic trajectory)
• Subroutine Apogee (Simplified to work better in the fall)
• 2 Programs in 1 ("Phase of Flight" and "Computer Connection")
  
• Interactive Program Connection PC Data Recovery
  

This day closed the transmission protoclo was as follows:

1. The data would be mounted on a PWM and would be proportional to the frequency of this.
2. The Duty Cycle (Duty Cycle) discriminate if the rocket was in flight or on land.
3. would Frequencies of 1000Hz to 3048Hz no more than
4. The data (between 0 and 1024, actually less for the processing received at the PIC) would be multiplied by 2 and then would add 1000 and thus obtain the PWM frequency.

   Here the equation: F (d) = d * 2 + 1000

   
   
5. A measured frequency is subtracted from 1000 and divided by 2 and get the data (between 0 and 1024, actually less for the processing received at the PIC).

   Here the equation: D (f) = (f - 1000) / 2

   
   

RESULT: Only frequencies are supported PAIRS in this protocol (due to the multiplication by 2), odd should be rounded as they are not possible.
programming code here: Final Program

The "Final Program V3" (as we call it, since he had two previous versions that were modified) was too complex to test in the laboratory because there were many conditions and variables to pretend to measure the Breadboard and receiving antennas was too cumbersome, they needed the rocket with its infrastructure (the program was designed with this philosophy and therefore there is where it should be tested), and beyond that we did not have the rocket at that time, would have required that this be raised, which could not simulate. That is why we tried lots of specially tailored program to be tested in the laboratory regardless of the others.
Unfortunately we got the surprise of the emission of radio frequency data was not working at all well. Since we could not find the error in programming, even with the help and expertise of Edgardo Baez and Arcusin Leandro (2 faculty scholars in the field) made several consecutive changes of transmission antennas and reception antennas (the latter laboratory to test whether the data actually issued PIC) and yet we could not get things consistent, but more noise.
After a while Leandro Arcusin noted that the PWM was changing constantly and steadily, and referred us to a pause after modify it to not be constantly depressed by the fact that the current case. The correction you gave us was correct, but the program was not working. Importantly, we stayed until well after school was for us, in fact it was more than double the time we had that day at school. After much time had decided to assume that errors may operate with the data to implement the protocol, after testing, we realized that somehow external to us the compiler does not properly handled multiplication and division, making the records are loaded with values \u200b\u200bthat were not allowed in the protocol and that the antennas could not be issued by a disability. Thus ended our day with a very disappointing end, we had a useful program for loading into the Rocket could not do anything in our power to fix our program, we had scheduled assuming that the compiler would do exactly what we said. We retired to our homes because we had stayed up so late starting classes Institute of Technology that works in our school at night and we had to release the Classroom. We thank Edgardo Leandro and for having stayed with us and helping us.

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(31 º) - 17/10/08

Once the altimeter , we set out to calibrate it.
To calibrate the circuit we had simulate pressure levels for which happen once the rocket in flight, that is why we use a bell to create empty and generate the possible values of pressure. The original idea is based on the method found on page of William Barefoot . This is a completely sealed bottle, except for two holes through which pass hoses, which suck the air to simulate different levels of pressure. To suck, the water breaks through the hose and using a meter, determine the height reached by water. The system used is quite similar to that proposed by Barefoot, only instead of using a bottle and an altimeter under test, use a vacuum chamber and the altimeter done for us.
Based on the levels of water present, using a conversion table by William Barefoot where set a height for each level of water. This is the table of equivalences of William Barefoot:
The pressure sensor is responsible for assigning a value of tension to a certain value of atmospheric pressure. The circuit consisted of a resistance that were fed back to the amplifier reaches the 5v output, but when we practice we got not or 4v and after analyze the possible values \u200b\u200band test with a resistance that saturated the track, we reach an output of 4.70 v.

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Thirty Day (30 th) - 10/10/1908 Twenty-Day

The circuit we had some errors printed using Protel 99 SE's correct. We proceeded to make the whole process that allows us to have the final product of a printed circuit (copper plate used is made of copper on one side and a fiberglass )

1. Cleaning and sanding of the face plate on copper.
2. Steaming Toner printed circuit and on a special sheet on the copper plate.
3. Separate sheet of copper plate into a container of cold water.
-product: copper plate Toner tracks covering part of its surface.
4. Submerged plate tracks in a ferric chloride tank for 20 minutes.
5. Removed from the tank plate chloride.
6. Rinsing the plate.
Byproduct: Plate with dissolved copper, except in the parts under the toner.
7. Removed by sanding of the parts with toner.
Byproduct: Plate with copper traces.
8. Coated copper face ContacFlux .
9. Leaky pads and other necessary holes.
Byproduct: End plate empty.
10. Components assembled in their respective places.
11. Soldier of the components.
Final Product: Printed Circuit.

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(29 º) - 10/03/1908 Twenty-Day

Since we did not get a sensor and we needed to launch an urgent, desolder the sensor a plate of previous years. We replace the connectors
cut the sensor, new wires and place it on the breadboard, to see the whole system performance.
got amplify pressure variations measured by translating them into voltage variations that are more significant than the sensor output is a few millivolts (mV), so the PIC can be seen with less measurement error that being made, as the PIC measures from 0 to 5 Volt and a resolution of at most 10 bit's, ie 1024 steps as the smallest step is 5V/1024 that is approximately 4 mV. If we had not amplified sensor output measurement would be really very vague. Amplifying get a higher degree of certainty.