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Saturday, November 18, no need to build boards! I found that I didn’t have uisp loaded on Ubuntu already – no worries, I thought. The chute is still the original 36″ rip-stop nylon.

IRF Datasheet PDF – Motorola => Freescale

In addition, using the 16′ of shock cord falls in the guideline of making iff531 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. The task was too simple.

I had the simple task of loading my program onto the AVR tonight to see datssheet execute my own code for the first time; I should have suspected there was no hope. Now that is the smart way to learn!

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. No joy there, either: The first command I used was Z which queries the system status – the return was error code E Michael pointed out the Advanced tab and that uisp is in the package list!

The IRF looked nice, so I bought a couple to learn with.

So I datashedt to my backup plan – install avrdude. For my own reference, this is a list of parts that I have ordered and the data sheets: I have no spares, so I’ll have to finish testing tomorrow: Impressive stuff, in my opinion. Monday, November 27, communication with AVR established! I picked up 3 quick-links from Home Depot and 16′ of Kevlar shock cord.


Since the other voltages i. Thursday, November 16, large capacitors.

IRF 数据表, Datasheet – Alldatasheet

A Google search led me to this great serial programming book. Newer Posts Older Posts Home. 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. It is probably still a no-brainer, but 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.

Gnd – 21 mA used – if resistance on gate-source, then current used will be smaller – assuming negligable resistance – circuit: 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 So here’s a nice resource that I bumped into on the forums: The most big question in my mind is the drain current min – why is there a min. Thursday, November 09, preparing to build rocket electronics.

Tuesday, November 28, talking to the uMMC.


Friday, November 10, spicy ubuntu. I’ll just build it Most people are already familiar with the Wikipedia and may already be familiar datadheet Wikibooks ; however, I just ran into Wikibooks for the first time.


Tuesday, November 21, mission failure – how to load AVR. Gnd – 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! 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.

So anyway – the reason for this post was datasneet I could write down somewhere the weights of the recovery harness. This is the last board that I etched myself – I don’t enjoy the process at all.

dwtasheet Links to this post. I’m have a pretty basic multimeter and a limited set of resistors, so I bread-boarded some iff531 with the intent of getting a most basic understanding.

But that is my own bug and I can fix that! Here are my notes in preparation for bread-boarding and testing: The chute, quick links, and shock cord weight a total of 6. Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation. Wednesday, November 01, Ready for Recovery.

Ah well – nice to have something work. Live and learn – at least I lived