flies&bikes is an evolving website covering my interests which vary from biology through technology to cycle sport.  It is presently built using the Joomla! CMS.  The present incarnation now uses an integrated version of the well-known blogging software Wordpress, developed by corePHP. I maintain several other related websites: Wonderful Life is a blog covering my interests in atheism, particularly as they relate to biology and creationism. North Bucks Road Club is the website of my cycling club. Northwood Wheelers is a website dedicated to the eponymous (but now defunct) cycling club, of which my father was a member. Team Grumpy features stories concerning cycle timetrialling, particularly as they relate to 2-up team time trials. The Team Grumpy blog is Team Grumpy’s blog, and most definitely tongue in cheek. Professionally, I maintain the British Society for Research on Ageing’s website.

I attempted some modifications of my saddle - I attached a piece of cork bar tape to the nose of the saddle with a few bits of tub tape. Actually this was a bit rubbish, twice while riding to work in the morning, the tape came off and had to be rescued from my thighs! At work I fixed it better with some gaffer tape. This was probably just as well, since by the time Katja and I set off for Stony, the rain had begun to fall.After last week’s sunny conditions, it was perhaps unsurprising that tonight’s event was a bit like time trialling through a river. The rain wasn’t perhaps as who should say torrential, but it was very definitely heavier that one would like.I felt pretty good as I left the start line, and rapidly warmed up on the way to Beachampton. once through Beachampton, I climbed up to Nash. I usually attract all sorts of criticism for keeping my bike in a high gear and low cadence for the climb, so this time I thought I’d have a go a lower gear/higher cadence for the steepest bit of the climb. I didn’t really notice any greta benefit, indeed if anything I went slower!I negotiated the sharp left and right through Nash with caution, then sped up towards the turn. On the return leg, speeds were that much higher, as it’s more downhill. As it was still raining pretty heavily, I thought it prudent to take the corners with a modicum of caution. Despite this, I did clock some pretty good speeds on the main descents.I came in with 28:29, which I thought quite respectable given the conditions - good enought for second place, since one of the fast boys punctured with a few km to go.Oh, and the saddle modification not only lasted the course despite the rain but worked…Results at NBRC

This was a lovely sunny evening, though getting rapidly cooler as the evening went on. It was good to be back on the Astwood course - last time we were forced onto the alternative Stagsden course by road works.I felt reasonably OK - considerably more energetic than at Sunday’s ’25’ when I felt distinctly sub-par. Having said that, the problem with my over-slippy saddle was still noticeable. Every few pedal strokes saw me needing to push myself back onto the saddle again. Clearly some modification is needed! On the bright side, this was my first ride in the new club skinsuit. The current kit is sourced from Bio-Racer, and I was very pleased with its fit and construction (changing kit suppliers is always a bit anxious!).I finished with 24:42, I think - a bit slower than I’d have liked.Results at NBRC

I approached this event with some optimism after recent 10 mile results. However the event switched from the F1B/25 to the F1/25 due to roadworks. Everyone else seems to think the F1B/25 is the slower of the two courses, but I prefer it for a number of reasons. As an aside, this might be the last time I ride on the F1/25 - with the scheduled addition of traffic lights at the Black Cat, the course will be unusable.Over at Tempsford, we parked and were assailed with usual agri-stench from the nearby farm. The weather was exactly as forecast - only a gently 7mph westerly, and clear skies. Sadly it was rather cold I collected my number, donned my fleecy gloves, and rode off for a brief warmup. That left me feeling rather cold!From the off, I felt like I was ploughing through treacle. I hoped that I’d pick up a bit of speed on the slip road down to the A1, but that evaporated pretty quickly. I was riding along at 25-26mph a lot of the time, and I had a clear run through all the roundabouts. I did however find it pretty tough at several points after the Buckden turn, presumably a combination of gradient, the wind (albeit quite gentle!) and my general lassitude. By the time I crossed the Black Cat on the return, it was looking pretty touch and go whether I’d scrape under the hour (but frankly I though by then it would be unlikely). Indeed, I crossed the line in 1:00:40.I’m not sure what the problem was. I’ve suffered recently from pulling my rear wheel, but this was sorted the day before by a spot of judicious tinkering. I will admit to wondering if my wheel was rubbing on the frame after feeling so sluggish (but that definitely wasn’t the case).On the day, I just couldn’t lift my pace, and couldn’t get comfortable. Maybe this is just getting used to riding in the aero tuck position - which is made a bit more difficult as my new saddle seems rather slippy in combination with my club skinsuit. I’ve taken a bit of sandpaper to it (the saddle, not the skinsuit!) in an effort to make it a bit grippier.Davey Jones was out there on the course taking photographs. After the event, he lambasted me for using too big a gear!

This was an overcast evening, but rather nice conditions for a time trial. We were all a bit concerned by road changes associated with the roadworks at the Kelley’s Kitchen roundabout (and the impact of the traffic lights on traffic flow. On the evening, we moved the start and finish slightly.I felt pretty good all round, but nothing spectacular. I had a pretty clear run through all the roundabouts, but flagged a bit on the rising road up to the dual carriageway section.Despite my hopes for a sub-23, I recorded 23:02 for second place equal in a field mostly consisting of  veterans. Quite an acceptable outcome! Full results at the NBRC website.

The F2A/10 is on the A428 dual carriageway, with a turn at Caxton Gibbet. It’s a bit of an exposed course, and in my experience is a bit susceptible to the effects of a windy day. And so it proved.Tony and I went over not quite knowing what to expect - in Tony’s case because this was his first event in 2014, and in my case because my training has a bit off the boil since before my last open event (the EC Cycles ’10’ in March).On the day, it was a reasonable temperature, the rain held off, but there was a significant crosswind out there on the course, which I found made my front trispoke a bit twitchy. I don’t know whether this is merely age-related caution or nerves, but I’m pretty sure I never used to find crosswinds so much hassle is the past. That, together with a close pass from a high speed car, made me rather unwilling to give it ‘full welly’!The initial couple of miles seemed to be slightly uphill, and I struggled to keep a decent speed up. Once over that, I had a reasonably straightforward ride, with little hassle from traffic, even at the turn roundabout. After the finish, I looked down and saw my rear wheel rubbing against the frame. This is a bit annoying - the little screw that’s supposed to prevent this is bent - and the placing of the disc wheel is difficult at the best of times because its profile doesn’t leave a lot of clearance at the chainstays.I finished with 22:54 - a little slower than my 22:47 at the EC Cycles ’10’ - a ride on a course with a similar profile but in much nicer conditions. So that’s encouraging at least.Other points of note, numerous dead badgers on the course gave it a rather gruesome appearance!Davey Jones was out on the course taking pictures!

In my first foray into Raspberry PI, I set one up as a Squeezebox networked music player using piCorePlayer - this one has a HiFiBerry DAC card and is remarkably easy to use - to switch it on or off you just plug in or unplug the power respectively. For the new project, I wanted to try the new Wolfson DAC card from Element 14, particularly as I was getting occasional crackles and pops from the USB output in Raspian. This DAC isn’t currently supported by piCorePlayer, so I was keen to take a different route.I ended up with a media player that didn’t have an obvious way of shutting it down, other than via the command line. So I wanted to figure out how to add a pushbutton that would shut the Pi down to state in which it can be powered down.

Installing the Wolfson DAC

Installing the Wolfson DAC card is pretty straightforward. It uses a set of sprung connectors to conenct to the P5 header of the Raspberry Pi, pushes on to the P1 header and fixes in place with a plastic screw. The screw is important to make sure the connectors are held against the P5. I didn’t bother with trying to set the DAC up with a stock Raspbian OS - Element 14 have an image file of a modified Raspbian with all modules etc set up from the get-go. It can be downloaded from here, though I found that the file wouldn’t unzip on my Mac, unless I used Keka, a third party archiver utility available from the App Store. There’s some discussion on the Element 14 discussion forums about the unzipping problem.I set up wifi and installed squeezelite as described in this tutorial - all pretty straightforward as I have a fair bit of Linux experience. I’m using an unbranded wifi USB stick that steadfastly refused to work with piCorePlayer - but it seems fine in Raspbian.In use, the Pi starts squeezelite when it boots, and it’s then visible to the LMS web interface and other squeezebox control apps such as SqueezePad and iPeng. I was using a terminal to shut the Pi down via the command line before powering down. This seemed less than ideal, so I investigated setting up a ‘shutdown’ push button switch for an easier and more orderly shutdown.

 3 Pin Header on the Wolfson DAC

The Wolfson DAC pretty much covers the main set of header pins, and makes three of these available via a three pin header on the card (referred in this thread).

Wolfson_Card_J8-1:RPI_TX  ->  RPi: P1-08 - TXD0 (ALT0) - GPIO14Wolfson_Card_J8-2:RPI_RX  ->  RPi: P1-10 - RXD0 (ALT0) - GPIO15Wolfson_Card_J8-3:GND

[caption id="attachment_2527" align="alignleft" width="400"] The J8 Header[/caption](GPIO14 is the pin closest to the edge of the DAC card, and GND is the one furthest from the edge). I connected a pushbutton switch on a breadboard to GPIO14 and GND for testing purposes.

Setting up the shutdown script.

Bearing in mind I’d never done any prior work with hardware interfaces, and never done any python work, this proved an interesting exercise!First, I installed RPi-GPIO:

sudo apt-get updatesudo apt-get -y install python-rpi.gpio

I don’t recall installing the time and os Python modules, so I assume they are there by default. I copied the shutdown code (from here) and saved as /home/pi/scripts/shutdown2.py. Note that the comment lines indicate sources - all I had to do was to edit the pin numbers from the original to use Pin 14.

# This script will wait for a button to be pressed and then shutdown

# the Raspberry Pi.

# http://kampis-elektroecke.de/?page_id=3740

# http://raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio

# https://pypi.python.org/pypi/RPi.GPIO

 import RPi.GPIO as GPIO

import time

import os

 # we will use the pin numbering of the SoC, so our pin numbers in the code are

# the same as the pin numbers on the gpio headers

GPIO.setmode(GPIO.BCM)

 # Pin 14 will be input and will have its pull up resistor activated

# so we only need to connect a button to ground

GPIO.setup(14, GPIO.IN, pull_up_down = GPIO.PUD_UP)

# ISR: if our button is pressed, we will have a falling edge on pin 14

# this will trigger this interrupt:

def Int_shutdown(channel):

# shutdown our Raspberry Pi

os.system("sudo shutdown -h now")

# Now we are programming pin 14 as an interrupt input

# it will react on a falling edge and call our interrupt routine "Int_shutdown"

GPIO.add_event_detect(14, GPIO.FALLING, callback = Int_shutdown, bouncetime = 2000)

# do nothing while waiting for button to be pressed

while 1:

        time.sleep(1)

To run the script at startup, I added this line to rc.local:

sudo python /home/pi/scripts/shutdown2.py

One reboot, and voila! My first attempt to use Raspberry Pi GPIO pins was a success! I’ve now soldered the switch to a couple of push-on connectors which fit to the J8 pins 1 and 3 (GPIO14 and GND respectively), so it’s a little fragile in the absence of a proper case! Pressing the shutdown button shuts the system down. I suspect that a reset button connected to Header 6 would re-start the device from that state, but I’ve yet to investigate.I’m presently using this Pi as a small player to drive a pair of headphones - it sounds rather good. Here's a photo of the finished device:[caption id="attachment_2526" align="alignleft" width="1000"] Raspberry Pi with Wolfson DAC (click to enlarge)[/caption]

This event was transferred to the backup course - the Stagsden ’10’ - owing to roadworks on the Astwood circuit. It was another cold and windy morning, and I was feeling decidedly ropy after my recent trip to Africa. Not because I’d caught anything, but maybe because of the continued antimalarial tablets. Anyway, on the day I felt distinctly sub-par, and shortly after starting I found myself on the climb up to Astwood into the teeth of a stiff and cold breeze. Sadly, I was struggling and couldn’t keep a decent speed up. Once past Astwood, things did improve, but the nagging headwind really did keep me in check. As I moved up to catch my minute man, I found my progress impeded a bit by a line of cars behind him (the leading car seemed rather timid), but eventually I made it.Once round the roundabout, things were a bit better, indeed I topped 37mph. But it wasn’t enough to compensate for my lack of form on the outbound leg and I finished with a long-ish 25. What was worse was that I had a horrible cough - and that was still with me on Sunday!Ho hum.Results at the NBRC websiteHere’s the Garmin trace (to be added)

I rode this event solo which, as it turned out, was no bad thing! I was keen to ride the event in part because that afternoon I was off to Kenya for a few days work. The morning was fairly breezy and quite cold. I left my jersey and backpack with the timekeepers, as I wanted to make a quick exit so i could pack for the Kenya trip…within a few meters of starting, it was clear that I had a mechanical issue. Looking down, I could see that my rear wheel had pulled and it was rubbing tightly against my frame. With a bit of a curse I stopped and climbed off to reposition the wheel. This took a fair bit of time, and I don’t think I recovered my composure!Another issue I noticed was that with the modifications to the big A5 roundabout near the start (which includes several traffic lights), the traffic along the course seems to come in ‘packets’ which can be a hassle when negotiating roundabouts on the course. Indeed, I got held up a couple of times for a few seconds - nothing major, but a distraction.So, mechanical ineptitude aside, how did the race go? Well, as I say, I didn’t really regain my composure, so I was reasonably pleased with 24:37!Results at NBRC websiteGarmin trace will be added