Current state of affairs
Haven't had much chance to work on the project or update the blog in the last couple of weeks due to the festive season being in full swing - aiming for a launch in a week or two though, I'll set a tentative date soon.
I was given a Sparkfun voucher for Christmas(thanks Holly! 
), which will go down a treat. Sparkfun are selling a humidity sensor which I'm ordering for the payload - this simple analogue sensor looks really easy to use, having an almost linear output.
Sparkfuns humidity sensor breakout board
I'm also ordering an MPX4115 pressure sensor from Farnell - a (cheap) absolute pressure sensor with a range from 15kPa to 115kPa. A minimum of 15kPa means that I will only have accurate pressure data upto 45,000 feet, but I don't know of any other sensors which are capable measuring lower pressures in the same price range.
MPX4115 pressure sensor
I purchased a piezoelectric buzzer to be used as a warning tone when the payload descends below 1 or 2km, and to help us find the payload in case it lands in trees or scrub. This little buzzer can run on anywhere from 1-13v, and draws less than 10mA at 5v. Even on a single AA battery, it's very loud!
Piezoelectric buzzer
My balloons have arrived from Kaymont also. I'm planning on doing a tethered test of telemetry & software this weekend, I'll send an email to everybody who's contacted me regarding tracking. Tethered balloons are bound by maximum altitude restrictions, so range will be limited, but hopefully we should be able to get an idea of how well everything is working.
Kaymont balloons
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