Wheel weight

On Wednesday, March 6, 2019 at 5:56:09 PM UTC-8, Sir Ridesalot wrote:
On Wednesday, March 6, 2019 at 7:21:33 PM UTC-5, Frank Krygowski wrote:
On 3/6/2019 6:04 PM, Sir Ridesalot wrote:
On Wednesday, March 6, 2019 at 11:19:45 AM UTC-5, Frank Krygowski wrote:
Snipped

Back in the mid-1980s I got my first cyclometer. For me, it was useful
motivation for training - as in "I'm only going 19 mph? I can go faster
than that!"

Nowadays the data is just depressing. I try not to look at it too much.

--
- Frank Krygowski

I guess that's why some people mount the cyclometer on their seatpost or seat-tube = so they aren't tempted to look at it whilst riding. Yet they have their accumulated mileage at the end of the ride.

Very, very vaguely related: On my folding bike, I installed a Cateye
wireless cyclometer, figuring any wire would eventually get ripped apart
during the frequent folds and unfolds.

But at temperatures less than about 45 Fahrenheit, it would lose contact
with the sending unit. It would say Zero miles per hour, even though I
was sure I was going a _little_ faster than that.

Changing batteries in the sender or display units didn't help. Shifting
the sender to different positions, ahead and behind the fork, didn't
help. I finally fabricated a separate little stub mount to keep the
display part about an inch in front of my handlebar. That seemed to cure
the problem. I guess the handlebar itself was blocking the radio signal..

My wife's identical bike has a much cheaper Echo brand wireless
cyclometer. It has no such problem.


--
- Frank Krygowski

I had a Schwinn wireless bicycle computer that had the exact opposite problem intermittently. I'd be going down a hill and the thing would tell me I was doing 200+ kph which I knew I wasn't. Even on the flats the speed readout would be intermittent. nasty if you're using it to measure distances between camping spots or between roads and trails branching off the road you're on.

Cheers

This is a problem that has to do with the software multiple sampling a line.. Above a certain speed it can test the line multiple times during the same pass of the magnet. This is easy to solve by simply using an interrupt rather than testing the lines synchronously. These are the sorts of problems that leap out at you when you're an embedded system designer.

On Wednesday, March 6, 2019 at 6:09:35 PM UTC-8, James wrote:
On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.

--
JS

As I said, there is nothing to see so you do all of your navigating on the audio ques. You set the screen to go dark and there is very little power used.

Somewhere I have a chest strap that would hold the phone up under my chin where I could hear the turn ques. After I traveled my old routes enough times for my memory to save them away I didn't need it anymore and I don't know where I put that strap. But it was available from Ebay.

On Wednesday, March 6, 2019 at 6:50:45 PM UTC-8, John B. Slocomb wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.


But why? After all the road goes from here to there. Or perhaps there
is a turn off maybe 3 miles down the road. One can only speculate how
the Old Folks could go anywhere... without a GPS :-)

--
Cheers,
John B.

I don't think that there is a road in the world that isn't marked at the intersections. I still have this large roll that I sewed out of soft canvas that holds all of the maps for the western US in individual pockets. Driving around France on tiny backroads they were all marked. Some from Roman times.

On Wednesday, March 6, 2019 at 7:11:51 PM UTC-8, Jeff Liebermann wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?

I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.

The average bicycle dynamo can deliver 3 watts. If you ride for 10
hrs, that's 30 watt-hrs. Assuming an inefficient 5V USB battery
charger, that's 6 amp-hrs or 6,000 ma-hrs. Assuming a smartphone with
a modest 2,000 ma-hr battery inside, you could completely recharge
your battery 3 times during your 10 hr ride. If you don't want the
added load while climbing hills, then you can recharge perhaps 1.5
times during the ride. If you use an mapping app that allows you to
store maps on your smartphone, you don't need cellular connectivity
during the ride and can therefore operating in airplane mode to save
power.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

https://www.ebay.com/itm/Weego-10400...YAAOSw3h1ZOOtM

On Thu, 7 Mar 2019 18:41:03 +1100, James
wrote:

On 7/3/19 2:11 pm, Jeff Liebermann wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?

I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.

The average bicycle dynamo can deliver 3 watts. If you ride for 10
hrs, that's 30 watt-hrs. Assuming an inefficient 5V USB battery
charger, that's 6 amp-hrs or 6,000 ma-hrs. Assuming a smartphone with
a modest 2,000 ma-hr battery inside, you could completely recharge
your battery 3 times during your 10 hr ride. If you don't want the
added load while climbing hills, then you can recharge perhaps 1.5
times during the ride. If you use an mapping app that allows you to
store maps on your smartphone, you don't need cellular connectivity
during the ride and can therefore operating in airplane mode to save
power.

Methinks you accidentally sent me your comments via email instead of
posting them to the newsgroup. I've inserted them below:

In airplane mode, how does it know where you are? (Mine doesn't have a GPS).

How does your mapping software know where you are without a GPS? In
the USA, a GPS is mandatory because of 911 location requirements. The
only mapping devices that don't have built in GPS receivers are some
low end laptops and Chromebooks. What maker and model are you using?

Most phones need more than 3W to keep the backlight on and CPU tracking
your location and displaying a map, etc.

The programs that I use on my various Android phones (My Trails)
allows me to control the GPS sampling time in order to keep the power
draw reasonable. They also have various "battery save" options to
reduce overall drain. My current phone, a Samsung S4 (my S6 blew up),
does not have a power consumption graph in the settings. I'll see if
I can find an app and check its consumption.

Incidentally, the charging current from a 3 watt source is close to
the typical 500ma charging current of most phones.
3 watts / 5V = 600ma.

Hopefully, you don't have the map display on all the time with
backlighting. I did that once while hiking and ran the battery down
on my previous S6 in about 4 hrs.

Oh, and the reason I know that 3W isn't quite enough, is because my
nephew tried it and his phone kept loosing battery power while being
charged by the dynamo.

Much depends on what equipment he was using and how he tested it.
However, he might be correct and 3W of intermittent power might not be
sufficient to maintain a full charge on a phone that's always turned
on and running. So, how do you use the phone? Always on, battery
save, or obtain a location when needed?

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Thursday, March 7, 2019 at 9:29:46 AM UTC-8, Jeff Liebermann wrote:
On Thu, 7 Mar 2019 18:41:03 +1100, James
wrote:

On 7/3/19 2:11 pm, Jeff Liebermann wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?

I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.

The average bicycle dynamo can deliver 3 watts. If you ride for 10
hrs, that's 30 watt-hrs. Assuming an inefficient 5V USB battery
charger, that's 6 amp-hrs or 6,000 ma-hrs. Assuming a smartphone with
a modest 2,000 ma-hr battery inside, you could completely recharge
your battery 3 times during your 10 hr ride. If you don't want the
added load while climbing hills, then you can recharge perhaps 1.5
times during the ride. If you use an mapping app that allows you to
store maps on your smartphone, you don't need cellular connectivity
during the ride and can therefore operating in airplane mode to save
power.

Methinks you accidentally sent me your comments via email instead of
posting them to the newsgroup. I've inserted them below:

In airplane mode, how does it know where you are? (Mine doesn't have a GPS).

How does your mapping software know where you are without a GPS? In
the USA, a GPS is mandatory because of 911 location requirements. The
only mapping devices that don't have built in GPS receivers are some
low end laptops and Chromebooks. What maker and model are you using?

Most phones need more than 3W to keep the backlight on and CPU tracking
your location and displaying a map, etc.

The programs that I use on my various Android phones (My Trails)
allows me to control the GPS sampling time in order to keep the power
draw reasonable. They also have various "battery save" options to
reduce overall drain. My current phone, a Samsung S4 (my S6 blew up),
does not have a power consumption graph in the settings. I'll see if
I can find an app and check its consumption.

Incidentally, the charging current from a 3 watt source is close to
the typical 500ma charging current of most phones.
3 watts / 5V = 600ma.

Hopefully, you don't have the map display on all the time with
backlighting. I did that once while hiking and ran the battery down
on my previous S6 in about 4 hrs.

Oh, and the reason I know that 3W isn't quite enough, is because my
nephew tried it and his phone kept loosing battery power while being
charged by the dynamo.

Much depends on what equipment he was using and how he tested it.
However, he might be correct and 3W of intermittent power might not be
sufficient to maintain a full charge on a phone that's always turned
on and running. So, how do you use the phone? Always on, battery
save, or obtain a location when needed?

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

I have a relatively old Motorola G3 and I can play it all day long in GPS mode. Though it is a little tricky to allow it to turn off the screen and continue mapping since after I discover the trick I immediately forget it. If I write it down I can't remember where I put the directions. As long as I'm taking this medication my short term memory will be screwed up.

I can only remember one time when I lost GPS and it was only for about 20 minutes in a deep canyon.

writes:

On Wednesday, March 6, 2019 at 6:50:45 PM UTC-8, John B. Slocomb wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.


But why? After all the road goes from here to there. Or perhaps there
is a turn off maybe 3 miles down the road. One can only speculate how
the Old Folks could go anywhere... without a GPS :-)

--
Cheers,
John B.

I don't think that there is a road in the world that isn't marked at
the intersections. I still have this large roll that I sewed out of
soft canvas that holds all of the maps for the western US in
individual pockets. Driving around France on tiny backroads they were
all marked. Some from Roman times.

You lack imagination. Here in Yankee-land it is typical to have only
the minor road marked at an intersection. If you don't recognize the
major road you're just out of luck.


--

On Thursday, March 7, 2019 at 10:05:15 AM UTC-8, Radey Shouman wrote:
writes:

On Wednesday, March 6, 2019 at 6:50:45 PM UTC-8, John B. Slocomb wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.


But why? After all the road goes from here to there. Or perhaps there
is a turn off maybe 3 miles down the road. One can only speculate how
the Old Folks could go anywhere... without a GPS :-)

--
Cheers,
John B.

I don't think that there is a road in the world that isn't marked at
the intersections. I still have this large roll that I sewed out of
soft canvas that holds all of the maps for the western US in
individual pockets. Driving around France on tiny backroads they were
all marked. Some from Roman times.

You lack imagination. Here in Yankee-land it is typical to have only
the minor road marked at an intersection. If you don't recognize the
major road you're just out of luck.


--

Well, this is now the socialist state of California and they don't even pave the roads if they can avoid it. Patching is considered the height of hedonism. Unless you live on the hills. If he average income of an area exceeds $150K a year the roads will be smooth as a baby's bottom.

On Thu, 07 Mar 2019 09:29:44 -0800,
Jeff Liebermann wrote:
On Thu, 7 Mar 2019 18:41:03 +1100, James
wrote:
On 7/3/19 2:11 pm, Jeff Liebermann wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

I rode 10 hours for 250 km over two big mountains (Mt Hotham
and Falls Creek), not to mention Tawonga Gap. That would
have killed my phone battery trying to navigate through all
the mobile black spots, in a couple of hours I reckon.

The average bicycle dynamo can deliver 3 watts. If you ride
for 10 hrs, that's 30 watt-hrs. Assuming an inefficient 5V
USB battery charger, that's 6 amp-hrs or 6,000 ma-hrs.
Assuming a smartphone with a modest 2,000 ma-hr battery
inside, you could completely recharge your battery 3 times
during your 10 hr ride. If you don't want the added load
while climbing hills, then you can recharge perhaps 1.5 times
during the ride. If you use an mapping app that allows you
to store maps on your smartphone, you don't need cellular
connectivity during the ride and can therefore operating in
airplane mode to save power.

Methinks you accidentally sent me your comments via email
instead of posting them to the newsgroup. I've inserted them
below:

In airplane mode, how does it know where you are? (Mine
doesn't have a GPS).

How does your mapping software know where you are without a
GPS? In the USA, a GPS is mandatory because of 911 location
requirements. The only mapping devices that don't have built
in GPS receivers are some low end laptops and Chromebooks.
What maker and model are you using?

To be more specific, the GPS receiver is separate from the
cellular receiver, so it operates just the same whether in or out
of airplane mode. The maps themselves come to the unit via cell
(or wifi), so have to be downloaded ahead of time (as Jeff said)
if you want a useful GPS function while in airplane mode.

--
Ted Heise West Lafayette, IN, USA

On 3/7/2019 12:02 PM, wrote:


I don't think that there is a road in the world that isn't marked at the intersections.

Tom, you must not get out much.

--
- Frank Krygowski