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Michael found BatchPCB and we get etching, solder mask, silk screen, and the holes drilled!
The most big question in my mind is the drain current min – why is there a min. The task was too simple.
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Saturday, November 18, no need to build boards! Gnd – 18 mA used – if 5V 20 mA isn’t enough to turn MOSFET on, then current will datasehet smaller You know what’s coming – after careful consideration of my constraints and building my circuit, I blew the fuse in my multimeter!
A Google search led datassheet to this great serial programming book. Most people are already familiar with the Wikipedia and may already be familiar with Wikibooks ; however, I just ran into Wikibooks for the first time.
In addition, using the 16′ of shock cord igf531 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.
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I have no spares, so I’ll have to finish testing tomorrow: 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. 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. But that is my own bug and I can fix that! The chute is still the original 36″ rip-stop nylon. The Roctronics projects was active a couple years ago, but there isn’t anything completely buildable there at the moment.
Live and learn – at least I lived For my own reference, this is a list of parts that I have ordered and the data sheets: The main risk with Kevlar is that it could result in zippers if the ejection wasn’t timed well or if the shock cord was too short.
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 3D view is pretty and neato, but what I’m not showing is the schematic with ammeter and voltmeters installed.
I found that I didn’t have uisp loaded on Ubuntu already – no worries, I thought. Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation.
So anyway – the reason for this post was so I could write down somewhere the weights of the recovery harness. Card not inserted; the other command I typed was V to request the system version and serial number – the return is kinda funny: Michael pointed out the Advanced tab and that uisp is in the package list!
IRF530 – N-CHANNEL ENHANCEMENT-MODE SILICON GATE TMOS POWER FIELD EFFECT TRANSISTOR
I found that Jameco substituted a Sipex chip for the Maxim MAX that I datazheet ordered; no problem there, just figure I should link to the correct data sheet. Thursday, November 09, preparing to build rocket electronics. Thursday, November 16, large capacitors. No joy there, either: By a bizzare turn, I happened to get communication with the AVR established – I have uploaded my program!
Links to this post. So here’s a nice resource that I bumped into on the forums: Now that is the smart way to learn! The first command I used was Z which queries the system status – the return was error code E I had the simple task of loading my program onto the AVR datasheer to see it execute my own code for the first time; I should have suspected there was no hope.
Here are my notes in preparation for bread-boarding and testing: Ah well – nice to have something work. The chute, quick links, and shock cord weight a total of 6. Newer Posts Older Posts Home.
I krf531 up 3 quick-links from Home Depot and 16′ of Kevlar shock cord. My mistake, besides doing this in real life rather than ifr531 Crocodile Clipswas that I didn’t plan my volt versus amp metering locations. Impressive stuff, in my opinion. It is probably still a no-brainer, but 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 Since the other voltages i.
We haven’t tried the service yet, but probably soon. The IRF looked nice, so I bought a couple to learn with. I’ll just build it 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. 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.
Friday, November 10, spicy ubuntu. Wednesday, November 01, Ready for Recovery. Monday, November 27, communication with AVR established! Tuesday, November 28, talking to the uMMC.