ANT+ Cadence Sensor With Static ID
11-07-19, 08:14 AM
#1
Junior Member
Thread Starter
Join Date: Nov 2019
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
ANT+ Cadence Sensor (Magnet Type) With Static Device ID
I need a ANT+ cadence sensor with a fixed ID. It needs to be persistent through power cycles, i.e through battery removal and replacement. It should be a magnet-sensing type, using a reed switch.
It seems common practice to randomize the ID at power-up. Probably so the manufacturer doesn't have to individually program each device on the manufacturing line. Makes sense but doesn't work for my project.
Any experience with this? Do you have a cadence sensor with ID which doesn't need to be re-learned after battery replacement? Thanks!
It seems common practice to randomize the ID at power-up. Probably so the manufacturer doesn't have to individually program each device on the manufacturing line. Makes sense but doesn't work for my project.
Any experience with this? Do you have a cadence sensor with ID which doesn't need to be re-learned after battery replacement? Thanks!
Last edited by vkonradi; 11-07-19 at 12:33 PM. Reason: clarification
11-07-19, 08:23 AM
#2
Senior Member
Join Date: Jul 2018
Location: USA
Posts: 2,190
Bikes: Ti, Mn Cr Ni Mo Nb, Al, C
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 942 Post(s)
Liked 526 Times
in
349 Posts
Never heard of this before and I've never had to re-pair my Wahoo cadence sensor when I replaced the battery.
11-07-19, 12:53 PM
#5
Full Member
Join Date: May 2017
Location: Washington, DC
Posts: 466
Bikes: Trek Domane 4.3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 193 Post(s)
Liked 50 Times
in
35 Posts
I have no idea if it uses a reed relay or not.
11-07-19, 12:57 PM
#6
Senior Member
A reed switch requires a magnet to trip it. You can hear the "pling" when a magnet comes within range. All of my ANT+ sensors (Wahoo, Cateye, and Garmin ) have a unique address to pair to.
11-21-19, 06:35 PM
#7
Junior Member
Thread Starter
Join Date: Nov 2019
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Purchased and tested a Bontrager Interchange cadence sensor. Confirming it appears to power up with the same ID after a battery change. My initial test was with a Niterider Rebel cadence sensor which definitely rolled its ID on a battery change.
11-27-19, 03:52 PM
#8
Senior Member
All my ANT+ sensors come up with the same ID whenever I pair them.
Curious, why does it have to be the magnet sensing cadence sensor? As long as it's a new sensor, why wouldn't you want to get rid of the external magnet issue?
Curious, why does it have to be the magnet sensing cadence sensor? As long as it's a new sensor, why wouldn't you want to get rid of the external magnet issue?
11-27-19, 06:34 PM
#9
Junior Member
Thread Starter
Join Date: Nov 2019
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I'm mashing up anemometers with cadence sensors. The resultant unit reports air speed on the cadence channel. I'm doing aerodynamic drag testing so I care about air speed, not cadence. I log that "cadence", a well-known value to all sorts of cycle computers, and post-process the logged cadence to obtain airspeed.
An old-style cadence sensor interfaces to a simple digital input, a magnetic reed switch. The anemometer interface into that cadence sensor is (relatively) trivial. A new style magnet-less sensors use an accelerometer to infer orientation, and there is not an obvious way to fool them with a different input.
My test bikes are all equipped with legacy wired or ANT+ Powertaps acquired at reasonable prices. For drag testing, important to know power at the wheel, not at the crank. Were I to move to BT, Weather Meter anemometer is supported by CdaCrr app, looks pretty cool. Anyone have experience with that combo?
An old-style cadence sensor interfaces to a simple digital input, a magnetic reed switch. The anemometer interface into that cadence sensor is (relatively) trivial. A new style magnet-less sensors use an accelerometer to infer orientation, and there is not an obvious way to fool them with a different input.
My test bikes are all equipped with legacy wired or ANT+ Powertaps acquired at reasonable prices. For drag testing, important to know power at the wheel, not at the crank. Were I to move to BT, Weather Meter anemometer is supported by CdaCrr app, looks pretty cool. Anyone have experience with that combo?
11-28-19, 09:16 AM
#10
Senior Member
I'm mashing up anemometers with cadence sensors. The resultant unit reports air speed on the cadence channel. I'm doing aerodynamic drag testing so I care about air speed, not cadence. I log that "cadence", a well-known value to all sorts of cycle computers, and post-process the logged cadence to obtain airspeed.
An old-style cadence sensor interfaces to a simple digital input, a magnetic reed switch. The anemometer interface into that cadence sensor is (relatively) trivial. A new style magnet-less sensors use an accelerometer to infer orientation, and there is not an obvious way to fool them with a different input.
My test bikes are all equipped with legacy wired or ANT+ Powertaps acquired at reasonable prices. For drag testing, important to know power at the wheel, not at the crank. Were I to move to BT, Weather Meter anemometer is supported by CdaCrr app, looks pretty cool. Anyone have experience with that combo?
An old-style cadence sensor interfaces to a simple digital input, a magnetic reed switch. The anemometer interface into that cadence sensor is (relatively) trivial. A new style magnet-less sensors use an accelerometer to infer orientation, and there is not an obvious way to fool them with a different input.
My test bikes are all equipped with legacy wired or ANT+ Powertaps acquired at reasonable prices. For drag testing, important to know power at the wheel, not at the crank. Were I to move to BT, Weather Meter anemometer is supported by CdaCrr app, looks pretty cool. Anyone have experience with that combo?
