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So I resorted to my backup plan – install avrdude.

Gnd – 21 mA used – if resistance on gate-source, then current used will be smaller – assuming negligable resistance – circuit: The main problems with the elastic bungie are that it won’t last like Kevlar since it lives in the booster airframe because of ejection chargesit can break easily, and it is elastic and may cause the ejected nose cone to bounce back into the booster and do damage.

By a bizzare turn, I happened to get communication with the AVR established – I have uploaded my program! I had the simple task of loading my program onto the AVR tonight to see it execute my own code for the first time; I should have suspected there was no hope.

The first command I used was Z which queries the system status – the return was error code E It made me suspect that my parallel port in my VM was not set for bidirectional communication, so I manually edited my VMX file to add 3 lines Now that is the smart way to learn!

Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation. Thursday, November 09, irf5331 to build rocket electronics.

None of the data sheets that I have looked at speak of a ‘gain factor’, but I read that forward transconductance what Croc Clips means by gain factor.

For my own reference, this is a list of parts that I have ordered and the data sheets: In addition, using the 16′ of shock cord falls in the guideline of making the shock cord at least 2 to 3 times the length of the rocket so the bodies have some time to slow down before the cord gets pulled.


Here are my notes in preparation for bread-boarding and testing: The IRF looked nice, so I bought a couple to learn with.

IRF531 MOSFET. Datasheet pdf. Equivalent

Michael found BatchPCB and we get etching, solder mask, silk screen, and the holes drilled! The task was too simple. Funny how things happen – I had given up on getting the AVR programmed via the parallel port and was going to try a serial method that Michael had found; I was closing out tabs in my browser and one happened to be pointing at this post about disabling the parallel port on the VMWare site.

I picked up 3 quick-links from Home Depot and 16′ of Kevlar shock cord. Monday, November 27, communication with AVR established! I’m have a pretty basic multimeter and a limited set of resistors, so I bread-boarded some circuits with the intent of getting a most basic understanding. So anyway – the reason for this post was so I could write down somewhere the weights of the recovery harness.

I have no spares, so I’ll have to finish testing tomorrow: Card not inserted; the other command Igf531 typed was V to request the system version and serial number – the return is kinda funny: Tuesday, November 28, talking to the uMMC. So here’s a nice resource that I bumped into on the forums: Thursday, November irc531, large capacitors. Since the other voltages i.

IRF Datasheet(PDF) – Inchange Semiconductor Company Limited

We haven’t tried the service yet, but probably soon. I found that Jameco substituted a Sipex chip for the Maxim MAX that I had ordered; no problem there, just figure I should link to the correct data sheet.


Impressive stuff, in my opinion. No joy there, either: This is the last board that I etched myself – I don’t enjoy the process at all. My mistake, besides doing this in real life rather than with Crocodile Clipswas that I didn’t plan my volt versus amp metering locations. The main risk with Kevlar is that it could result in zippers if the ejection wasn’t timed well or dafasheet the shock cord was too short. The chute is still the original 36″ rip-stop nylon. I found that I didn’t have uisp loaded on Ubuntu already – datssheet worries, I thought.

Links to this post. Ah well – nice to have something work.

Newer Posts Older Posts Home. I’ll just build it It is probably still a no-brainer, but Friday, November 10, spicy ubuntu. The 3D view is pretty and neato, but what I’m not showing is the schematic with ammeter and voltmeters installed. Live and learn – at least I lived But that is my own bug and I can fix that! The chute, quick links, and shock cord weight a total of 6. A Google search led me to this great serial programming book.

Michael pointed out the Advanced tab and that uisp is in the package list! Gnd dataxheet 18 mA used – if 5V 20 mA isn’t enough to turn MOSFET on, then current will be smaller You know what’s coming – after careful consideration of my constraints and building my circuit, I blew the fuse in my multimeter!

Most people are already familiar with the Wikipedia and may already be familiar with Wikibooks datasjeet however, I just ran into Wikibooks for the first time.