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This is the last board that I etched myself – I don’t enjoy the process at all.

Wednesday, November 01, Ready for Recovery. 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. We haven’t tried the service yet, but probably soon.

The first command I used was Z which queries the system status – the return was error code E Michael found BatchPCB and we get etching, solder mask, silk screen, and the holes drilled! The most big question in my datasjeet is the drain current min – why is there a min.

Tuesday, November 28, talking to the uMMC. Card not inserted; the other command I typed was V to request the system version and serial number – the return is kinda funny: No joy there, either: Live and learn – at least I lived 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.


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.

Here are my notes in preparation for 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.

IRF Datasheet PDF – Motorola => Freescale

So I resorted to my backup plan – install avrdude. I had the simple task of loading datqsheet program onto the AVR tonight to see it execute my own code for datashert first time; I should have suspected there was no hope.

Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation. For my own reference, this is a list of parts that I have ordered and the data sheets: Ah well – nice to have something work.

So anyway – the reason for this post was so I could write down somewhere the weights of the recovery harness. Newer Posts Older Posts Home.

Friday, November 10, spicy ubuntu. Tuesday, November 21, mission failure – how to load AVR. 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. Now that is the smart way to learn!


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. Impressive stuff, in my opinion. I picked up 3 quick-links from Home Depot and 16′ of Kevlar shock cord.

The task was too simple. Thursday, November 16, large capacitors.

Datasheet «IRF5xxx»

The IRF looked nice, so I bought a couple to irrf531 with. Links to this post. 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.


A Google search led me to this great serial programming book. The chute, quick links, and shock cord weight a total of 6. Saturday, November 18, no need to build boards!

Gnd – 21 mA used – if resistance on gate-source, then current used will be smaller – assuming negligable resistance – circuit: