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[18:48] <rocketboy> hey phatmonkey - is there any way you could add a search facility to the IRC channel logs on the ukhas website sometime? (no rush)
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[22:17] <jcoxon> hey all
[22:17] <jcoxon> rocketboy, is the launch going ahead this weekend?
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[22:31] <rocketboy> yes as far as I know - Laurence is going to launch and so are the NOVA guys
[22:38] <jcoxon> oh excellent
[22:39] <jcoxon> they finally get permission? or has their time working for hte department over?
[22:40] <rocketboy> No idea - C said they had to clean the blood off the walls =:D
[22:42] <jcoxon> hehe
[22:43] <jcoxon> i'm amazed you managed to contact him
[22:43] <jcoxon> i think he ignores me :-p
[22:45] <rocketboy> The NoVA guys are talking about Sunday - and I think it would be better for Larence to go Saturday - as there is a possibility of the radio systems interfering if there are 2 flights at the same time using the same frequency (NOVAs tracker and MiHABs downlink use the same frequency)
[22:45] <jcoxon> oh right
[22:45] <jcoxon> your going to have a busy weekend
[22:46] <rocketboy> Also that way I can test out the NOVA downlink on the Saturday with H
[22:46] <rocketboy> yeh - busy indeed - but thas no problem when its fun!
[22:47] <jcoxon> launching from churchill?
[22:48] <rocketboy> yep
[22:49] <jcoxon> sadly i can't make it
[22:49] <rocketboy> I'll ring H tomorrow to discuss - If I find out more I'll let you know.
[22:50] <rocketboy> downer :-(
[22:50] <jcoxon> oh well - i can't make it to all the launches
[22:50] <jcoxon> though i'm wondering do they have a filler?
[22:51] <rocketboy> Don't know - I think they have the helium.
[22:51] <jcoxon> i'm sure they've thought of it - its just a couple of pipes
[22:52] <rocketboy> I guess they need to make up your piece of plumbing?
[22:52] <rocketboy> What size pipe fits the balloon necks?
[22:52] <jcoxon> ummm not sure
[22:52] <jcoxon> i'd have to measure my filler
[22:53] <rocketboy> That would be handy - I could make one for myself then
[22:54] <jcoxon> i'll do that tomorrow
[22:54] <jcoxon> stick it on the wiki
[22:54] <jcoxon> with a few pics etc
[22:54] <rocketboy> That would be excellent.
[22:55] <jcoxon> the wiki is coming along nicely
[22:56] <rocketboy> yes - I have added a few bits an pieces - I was thining on doing a blog on my flight computer as it develops
[22:57] <jcoxon> that would be cool
[22:57] <jcoxon> what route are you taking? PIC?
[22:58] <rocketboy> yes PIC18F chip + a SD card for transfering data
[22:59] <rocketboy> I have built the board up - about 30mm x 80mm
[23:00] <rocketboy> There are 6 analoge ports and 8 digital I/O
[23:00] <jcoxon> very nice
[23:00] <rocketboy> plus serial I/O etc.
[23:01] <jcoxon> yeah
[23:01] <jcoxon> i'm putting together my first ever circuit
[23:01] <rocketboy> I'm writing in C
[23:01] <jcoxon> to get some adcs through i2c
[23:01] <rocketboy> what is it?
[23:02] <jcoxon> i've got a maxim 127 chip
[23:02] <rocketboy> what adcs are you using
[23:02] <rocketboy> hang on I'll have a deco
[23:03] <jcoxon> i plan to stick some accelerometers on
[23:03] <jcoxon> and a digital compass
[23:05] <rocketboy> nice - 1mV steps
[23:05] <jcoxon> is it okay then?
[23:07] <rocketboy> Yeah looks good - easy enough to interface to
[23:07] <rocketboy> I have played with the KMZ51 Magnetic sensor in the past - they do a 2 axis sensor now KMZ52
[23:08] <jcoxon> i'm struggling to find accelerometers in the UK
[23:08] <jcoxon> might order from sparkfun
[23:08] <rocketboy> you could make a 3 axis sensor with a KMZ51 + a KMZ52 - that would be real fun
[23:09] <jcoxon> where can i get KMZ5*?
[23:10] <rocketboy> Maplin used to hold the standard accelerometers
[23:10] <rocketboy> hang on I'll have a look
[23:10] <rocketboy> if not I have one somewhere
[23:14] <jcoxon> i actually need to get my hands on a sensor so that i can test the circuit i plan to build!
[23:14] <rocketboy> No luck with Maplins - but RS do both the ADXL150(1 axis) and ADXL250(2 axis)
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[23:15] <rocketboy> about £20 a pop though
[23:16] <rocketboy> aggh - I didn't read they are discontinued
[23:16] <jcoxon> i was thinking of ordering from sparkfun and getting them shipped over
[23:17] <rocketboy> how many do you want?
[23:17] <jcoxon> well i've got 8 inputs
[23:18] <jcoxon> i'd really like to know the spin of a payload
[23:18] <jcoxon> so 3 axis accelerometers
[23:18] <jcoxon> either single or multiple
[23:18] <jcoxon> also i want a digital compass to see how it reacts
[23:20] <rocketboy> the magnetic chips have a differential output - you will probably need some interface circuitry between the chips and the A2D
[23:21] <jcoxon> hmmm
[23:21] <jcoxon> well if i get the circuit done it'll allow me to interface other things
[23:25] <rocketboy> Yeah - quite a few sensors have the same type of differential output - load cells pressure sensors etc.
[23:25] <jcoxon> i'll start off with a temperature sensor and work up
[23:25] <jcoxon> hehe
[23:25] <jcoxon> Peg IV is going to be pretty simple - i'm going to go with just a phone and a radio beacon (if the peg III is still avaliable)
[23:25] <rocketboy> Internal and external temprature sensors would be a good start
[23:26] <jcoxon> i have it to henry
[23:26] <jcoxon> yeah perhaps i'll order those now
[23:26] <jcoxon> so that i have something to test with
[23:28] <jcoxon> when do you reckon you're flight computer will be ready?
[23:29] <rocketboy> Well I might have somthing basic working in a week or so (no SD card) - just GPS parser and radio downlink interface
[23:30] <jcoxon> want to launch with me and phatmonkey in october?
[23:31] <rocketboy> still playing with the cutdown circuit at the moment though - fireing cutdowns left right and centre at the mo
[23:31] <jcoxon> (though feel free to go solo)
[23:31] <rocketboy> October would be great
[23:31] <jcoxon> also means that i can just have phone onboard
[23:32] <jcoxon> and focus on a small payload with sensors
[23:32] <rocketboy> Humm the whole thing needs to be modular
[23:33] <jcoxon> ?
[23:33] <rocketboy> So adding/subtracting things is simple
[23:34] <jcoxon> whose payload is this? or is the whole flight in general?
[23:34] <phatmonkey> hey all
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[23:34] <jcoxon> hey ben
[23:34] <rocketboy> Somthing like a bus - where the phone/downlink/camera/sensors can be added
[23:35] <jcoxon> yeah i've done that
[23:35] <jcoxon> i've got a 25pin connector off my gumstix
[23:35] <jcoxon> with differnet things coming out through it
[23:35] <jcoxon> but for a multiple flight we'd all have seperate payloads in a train
[23:36] <rocketboy> Ok - I will aim to get a GPS+downlink+radio tracker working
[23:37] <jcoxon> and cutdown?
[23:38] <jcoxon> phatmonkey, rocketboy reckons he'll have a payload ready by october to go on our flight
[23:38] <phatmonkey> great
[23:38] <phatmonkey> i guess i need to hack something together
[23:38] <phatmonkey> the radio downlink software is the biggy
[23:38] <phatmonkey> freddie has done some great work on the ground station
[23:39] <phatmonkey> it obviously doesn't need to control/read much for this, but it's easily expandable to a glider to let us control absolutely everything
[23:39] <jcoxon> with 3 payloads and 2 radios will we have an issue?
[23:39] <jcoxon> or would this be a suitable test scenario?
[23:39] <phatmonkey> issue with...
[23:40] <phatmonkey> ?
[23:40] <jcoxon> 2 radios
[23:40] <jcoxon> interferance
[23:41] <phatmonkey> oh
[23:41] <phatmonkey> rocketboy?
[23:41] <rocketboy> yep?
[23:41] <phatmonkey> it shouldn't if they're on different frequencies, surely
[23:41] <phatmonkey> would the two radios interfere?
[23:41] <rocketboy> depends on the frequency used
[23:41] <phatmonkey> whatever radios we're using... i'm not sure
[23:41] <rocketboy> I'm using 434.075 and 434.650
[23:42] <rocketboy> MHz
[23:43] <jcoxon> we'd also need to decide on positions on the flight train pretty soon - so as to work out cutdown etc
[23:43] <phatmonkey> i've got a smallish tupperware box, loads of polystyrene, gumstix, gps
[23:43] <phatmonkey> wahet else do i need
[23:43] <phatmonkey> ah, batteries
[23:43] <phatmonkey> who will have the most reliable live communication?
[23:43] <phatmonkey> that payload should take the cutdown
[23:43] <jcoxon> and also balloon size and where we get it from
[23:44] <jcoxon> that rules me out :-p
[23:44] <phatmonkey> my 60" parachute should be fine for the 3
[23:44] <jcoxon> oh definitly
[23:44] <jcoxon> i'll be upset if my payload weighs more then 1kg
[23:44] <rocketboy> 60" wow - how heavy?
[23:44] <phatmonkey> eerrm, not sure
[23:44] <phatmonkey> not very heavy?
[23:44] <phatmonkey> hehe
[23:45] <phatmonkey> i might get a 48" for the final glider
[23:45] <jcoxon> i've got a 36"
[23:46] <rocketboy> 60" is like 20Kg
[23:46] <phatmonkey> oh, how much weight it can carry
[23:46] <phatmonkey> uuerm
[23:47] <phatmonkey> http://spherachutes.com/chart.asp - that's the chat from the guys I bought it from
[23:47] <phatmonkey> chart
[23:49] <rocketboy> humm yes the chart says about 3Kg for a 60" chute
[23:51] <jcoxon> rocketboy, for a temperature sensor do i want one with a linear output?
[23:52] <rocketboy> yep - try one of the LM34 range - they are cheap enough
[23:53] <rocketboy> Phat - ignore my 20Kg (I looked at the wrong chart) 3Kg is more like it
[23:54] <jcoxon> phatmonkey, what sort of weight is your payload?
[23:55] <rocketboy> LM50, LM60/61/62
[23:55] <phatmonkey> jcoxon, it probably won't be much more than 1kg
[23:55] <phatmonkey> unsure yet
[23:55] <phatmonkey> the radio gear doesn't way much does it rocketboy?
[23:56] <rocketboy> next to nothing (50g)
[23:56] <rocketboy> inc battery
[23:57] <phatmonkey> ah goody
[23:57] <phatmonkey> i just need to sort out some rechargable lithiums then and i'm sorted
[23:57] <phatmonkey> apart from cleaning up the software to something usable
[23:57] <phatmonkey> i like the idea of rechargables
[23:57] <phatmonkey> i can test duration without it costing anything too...
[23:58] <rocketboy> Li-Po IMO
[23:58] <rocketboy> is the way to go
[23:59] <rocketboy> or Li-ion from a phone
[23:59] <jcoxon> i was thinking Li-ion
[00:00] --- Thu Sep 7 2006