[00:14] <LaurenceB> i'll be off then cya
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[10:01] <jcoxon> hey guys - sorry for this but zeusbot will be coming and going for a bit today
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[10:31] <jcoxon> !position
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[10:44] <jcoxon> hello
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[10:50] <jcoxon> hello
[10:50] <jcoxon> zeusbot, hello
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[10:52] <jcoxon> !coutdown
[10:52] <jcoxon> hello
[10:53] <jcoxon> zeusbot, hello
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[10:56] <jcoxon> hello
[10:56] <jcoxon> zeusbot, hello
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[11:26] <jcoxon> right, now to right a perl script to read emails that are received from a gateway that converts sms to email, the sms originally coming from Peg IV
[11:26] <jcoxon> hehe right - write
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[11:59] <jcoxon> hehe right - write
[12:00] <jcoxon> oops
[12:01] <jcoxon> mc-, paylod is working nicely now
[12:08] <mc-> so it was a s/w problem?
[12:09] <jcoxon> actually i think it was something to do with the soldering of the phone cable
[12:09] <jcoxon> shorting the serial port out
[12:09] <jcoxon> i'm going to suspend the wires a bit in a blob of glue
[12:09] <mc-> just emailed you my attempt at a launch procedure
[12:10] <mc-> my GPS can't get a fix today, don't know why
[12:10] <jcoxon> cloud?
[12:11] <jcoxon> i'm inside and can get enough to get the time
[12:11] <jcoxon> thats all
[12:13] <mc-> I think, it's good to test it outside, in case the ant isn't very good
[12:13] <jcoxon> oh i will
[12:13] <jcoxon> just need to get a new battery pack
[12:14] <jcoxon> brb
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[12:16] <jcoxon> sorry about that - just changing to my laptop
[12:17] <mc-> I was going to call partydays, do you need the 20 balloon cylinder?
[12:17] <jcoxon> ummm let me check
[12:21] <jcoxon> where on their website do they have the helium tank lists?
[12:21] <mc-> http://www.partydays.co.uk/heliumhire.htm
[12:22] <jcoxon> for peg I i used a V size tank
[12:22] <jcoxon> which has a volume of 1.81m3
[12:23] <jcoxon> now if we are using a 1000g balloon
[12:23] <jcoxon> peg III we used a T tank
[12:24] <jcoxon> and we filled a 500g, overfilled a 200g and another balloon
[12:26] <jcoxon> so the smallest won't be sufficent
[12:26] <jcoxon> i suggest a T size tank
[12:27] <jcoxon> it'll be about £60
[12:27] <jcoxon> it better to have more then less
[12:36] <mc-> how many balloons will there be?
[12:38] <jcoxon> at the moment it looks like one
[12:38] <jcoxon> a 1000g balloon
[12:51] <mc-> just spoken to partydays, can I give you a call, rather than typing out the details
[12:51] <mc-> I'll email my number
[12:52] <jcoxon> one sec i'll grab my phone
[12:54] <jcoxon> mc-, are they the details?
[12:55] <mc-> how do you mean?
[12:55] <jcoxon> oh in the email?
[12:55] <jcoxon> do you still want me to call?
[12:55] <mc-> oh, you need to pick up the bottle in their warehouse in Harston on Friday
[12:55] <jcoxon> hmmmm
[12:55] <jcoxon> that could be an issue
[12:56] <mc-> let's talk briefly
[12:57] <jcoxon> http://www.balloon.co.uk/gas.htm
[13:08] <jcoxon> bbl
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[16:09] <mc-> jcoxon, I tried calling back partydays (before 4pm), no answer in the warehouse.
[16:09] <jcoxon> oh okay
[16:11] <jcoxon> still got a week :-D
[16:12] <mc-> should I go for the T cylinder that has 1.5X more gas in it?
[16:12] <jcoxon> better safe then sorry?
[16:12] <jcoxon> i'm not sure
[16:15] <mc-> it's another 10quid for 0.5X more gas..so as long as there's future launches in the next few months, it makes sense.
[16:17] <jcoxon> yeah
[16:17] <jcoxon> very true
[16:18] <jcoxon> well if peg IV survives i'd be keen for some more launches relatively soon
[16:18] <jcoxon> perhaps rig my gumstix to do a bit of sensing in the payload bay
[16:18] <mc-> I've got the bits to make several more complete payloads.
[16:18] <mc-> If we can use alkaline batts etc, then the cost to lose a payload should be small.
[16:20] <mc-> the cameras will be the most expensive item
[16:20] <jcoxon> yeah
[16:20] <jcoxon> i'm still debating alkalines
[16:20] <jcoxon> my gps has been running off nimh since 11
[16:20] <mc-> I'm going to measure temp on my next design
[16:22] <mc-> did you get your temperature logger running?
[16:23] <jcoxon> no not yet
[16:23] <jcoxon> was battling with the router
[16:23] <jcoxon> which is working fine now
[16:23] <jcoxon> and also with text messeges
[16:29] <mc-> I saw you're using SMS to email
[16:29] <jcoxon> well trying to
[16:29] <jcoxon> have now learnt how to use zeusbot and scripts
[16:30] <jcoxon> so its a matter of writing a perl script to check the email and extract the info
[16:30] <jcoxon> i'll have peg IV send it to the email address every 5 minutes of so
[16:30] <jcoxon> and every minute to me
[16:31] <mc-> how about getting all SMSs sent to you, and then you can forward them as required to SMS2email?
[16:31] <jcoxon> thats an even better idea :-p
[16:32] <jcoxon> would be quite cool - have zeusbot set up so that anyone could use the service and get position coordinates sent to irc
[16:32] <jcoxon> say if someone else launches
[16:34] <mc-> is it easier to send the coordinates to a website?
[16:34] <jcoxon> no really difference i guess
[16:35] <jcoxon> either php to a website
[16:35] <jcoxon> or tcl to zeusbot
[16:35] <jcoxon> just thought it would be cool for people on the channel who can't be around can follow
[16:35] <jcoxon> so you go
[16:35] <jcoxon> woohoo
[16:35] <jcoxon> could easily do both i guess
[16:36] <jcoxon> once i've got my perl script to parse it
[16:37] <mc-> I just googled on zeusbot irc and you came up a #1..
[16:37] <jcoxon> hehe
[16:38] <jcoxon> thats cause zeusbot is my invention
[16:38] <jcoxon> eggdrop is the software
[16:38] <mc-> wow~
[16:38] <jcoxon> as in its adapted from normal irc bots
[16:38] <jcoxon> i didn't do much to it
[16:39] <jcoxon> its called zeus just to keep it at the bottom of the irc user list
[16:43] <mc-> was just thinking, the best place for the coordinates would be a WAP page, then people doing recovery could get the latest coordinates without having to make lots of phone calls.
[16:45] <jcoxon> hmmm - are they difficult to set up?
[16:48] <mc-> very easy, just follow the standard format, and you can get a page up in minutes
[16:48] <mc-> the hardest bit is typing in the page from a phone..so a tinyurl helps.
[16:53] <mc-> http://www.all2wap.com/ doesn't require any wap knowledge
[16:55] <jcoxon> oh cool
[16:55] <jcoxon> hmmm my camera might get a wee bit cold
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[16:56] <jcoxon> had to increase the size of its hole in the side of the payload
[16:56] <jcoxon> won't effect the main payload as there is another layer of insulation between the camera and the main electronices
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[18:46] <LaurenceB> hi everyone
[18:47] <LaurenceB> just got 140 grams thrust out of the motors off my plane :-)
[18:47] <LaurenceB> think its li-poly time
[18:47] <LaurenceB> off to ebay
[18:48] <LaurenceB> the total weight will be 300 grams with a 7.4v li-poly battery
[18:53] <mc-> how did you measure the thrust?
[18:57] <LaurenceB> digital balance
[19:05] <mc-> btw, do you have a payload for the 7th Jan?
[19:11] <LaurenceB> no fraid not
[19:11] <LaurenceB> do you know what the minimum thrust to weight ratio is for a plane?
[19:13] <LaurenceB> to get it to fly reliably i.e. not rely on thermals or anything like a glider
[19:13] <LaurenceB> can't find anything on the internet
[19:17] <mc-> sorry don't know
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[19:54] <LaurenceB> this is so annoying I just want a guide on thrust to weight ratio
[20:04] <LaurenceB> http://www.grc.nasa.gov/WWW/K-12/BGP/Donna/t_w_ratio_answers.htm
[20:04] <LaurenceB> at last
[20:04] <LaurenceB> looks like I need at least 0.25 to 1
[20:04] <LaurenceB> from thrust experiments that means approx 2.5A per motor, 5A total
[20:53] <LaurenceB> problem is that one of the motors wired straight into to battery will draw too much current I think, will have to look at internal resistence
[20:56] <LaurenceB> I've updated the wiki with a more detailed explanation of the maths
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[23:06] <LaurenceB> the low voltage cutout is tricky, looks like I need a speed controller to be sure of this working
[23:06] <LaurenceB> but these are cheap and give a regulated supply for the autopliot
[23:20] <jcoxon> right i'm off to bed
[23:20] <jcoxon> night all
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[00:00] --- Sat Dec 30 2006