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ANT+ Cadence Sensor With Static ID

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ANT+ Cadence Sensor With Static ID

Old 11-07-19, 08:14 AM
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vkonradi
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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!

Last edited by vkonradi; 11-07-19 at 12:33 PM. Reason: clarification
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Old 11-07-19, 08:23 AM
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jadocs
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Never heard of this before and I've never had to re-pair my Wahoo cadence sensor when I replaced the battery.
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Old 11-07-19, 09:03 AM
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vkonradi
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Good to know. Are you using the Wahoo in ANT+ or BLE mode?
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Old 11-07-19, 09:13 AM
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Edited my original post: It should be a magnet-sensing type, using a reed relay.
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Old 11-07-19, 12:53 PM
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Originally Posted by jadocs View Post
Never heard of this before and I've never had to re-pair my Wahoo cadence sensor when I replaced the battery.
I haven't had to re-pair my Bontrager DuoTrap cadence/speed sensor. My Wahoo Tickr, which is paired to my phone with BT has a unique BT identifier (I actually have two, because I had lost one temporarily, and it has a different identifier).

I have no idea if it uses a reed relay or not.
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Old 11-07-19, 12:57 PM
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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.
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Old 11-21-19, 06:35 PM
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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.
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Old 11-27-19, 03:52 PM
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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?
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Old 11-27-19, 06:34 PM
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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?
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Old 11-28-19, 09:16 AM
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Originally Posted by vkonradi View Post
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?
I never would have guessed that application in a million years but I see now why you need that.
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