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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 Ah well – nice to have something work.
We haven’t tried the service yet, but probably soon. Tuesday, November 21, mission failure – how to load AVR. Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation.
Michael found BatchPCB and we get etching, solder mask, silk screen, and the holes drilled! A Google search led me to this great serial programming book.
IRF530 – N-CHANNEL ENHANCEMENT-MODE SILICON GATE TMOS POWER FIELD EFFECT TRANSISTOR
This is the last board that I etched myself – I don’t enjoy the process at all. 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.
The chute, quick links, and shock cord weight a total of 6. 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. 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.
Tuesday, November 28, talking to the uMMC. Gnd – 21 mA used – if resistance on gate-source, then irf513 used will be smaller – assuming negligable resistance – circuit: Friday, November 10, spicy ubuntu. Thursday, November 09, preparing to build rocket electronics.
For my own reference, this is a list of parts that I have ordered and the data sheets: 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.
Thursday, November 16, large capacitors.
Here are my notes in preparation datashset bread-boarding and testing: 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. Michael pointed out the Advanced tab and that uisp is in the package list!
Links to this post. 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. Now that is the smart way to learn! 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.
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. Monday, November 27, communication with AVR established! Saturday, November 18, no need to build boards!
By a bizzare turn, I happened to get communication with the AVR established – I have uploaded my program! My mistake, besides doing this in real life rather than with Crocodile Clipswas that I didn’t plan my volt versus amp metering locations. Wednesday, November 01, Ready for Recovery.
IRF Datasheet pdf – N-Channel Power MOSFETs/ 20 A/ V – Fairchild Semiconductor
Gnd – 18 mA used – if 5V 20 mA isn’t enough to turn MOSFET on, eatasheet current will be smaller You know what’s coming – after careful consideration of my constraints and building my irff531, I blew the fuse in my multimeter! Funny how things happen – I had given datashret 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 have no spares, so I’ll have to finish testing tomorrow: Newer Posts Older Posts Home. Card not inserted; the other command I typed was V to request the system version and serial number – the return is kinda funny: It dattasheet probably still a no-brainer, but The task was too simple. So I resorted to my backup plan – install avrdude. The 3D view is pretty and neato, but what I’m not showing is the schematic with ammeter and voltmeters installed.
SUTEX IRF Series Datasheets. IRF, R Datasheet.
So anyway – the reason for this post was so I could write down somewhere the weights of the recovery harness. Impressive stuff, in my opinion. No joy there, either: