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A companion device to the Nintendo Wii Fit system that measures speed, altitude and steps taken during a workout.

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Fit Meter IR emitter freq

Can anyone who has this device record a video focusing on the ir emitter when pairing to the Wii U??

It has to be at possibly with exposition at low to catch the frequency this device has

Thanks in advance!

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Its should be a standard irDA setup. Here's a good article on how it works: IrDA Transceiver (Infrared Transmitter Tutorial)

What you'll want to do here is make a tool to 'see' the IR signal. Here is a simple set of circuits which you can build to test the IR signal and with it you should also be able to measure the signal with a few modifications: Infrared based music transmitter and receiver.

In your case you'll need to modify the speaker output so it can be connected to your computer as an audio input then saving the output into an audio file which you can open up within an app to measure the time base of the signal.

A coworker of mine a few years ago did this so he could control a TV set for his mother who had a hard time changing channels using the TV remote (she has arthritis and was bed ridden). In his case he programed an iPad so each station was a single button she could press. He used this IR unit RedEye. At the time it was a novel idea. Today there are quite a few IR and even TCP/IP over WiFi or Ethernet that can do this.

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omg you helped me a lot.. unfortunately I don't own this device as is not available in my zone... that's why I'm interested in the exact frequencies of the device's output to see how works

That's why I need, preferably, the sequence.. or maybe someone to record the process of pairing to emulate it with another it emitter

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Sorry guy, I don't have the WII fit meter nor the setup to measure the irDA signal. I doubt anyone has the tools to do what you're looking for. I'm sure you can still buy one online and do you own testing. If the WII set is keyed so it won't work with WII fit meter in your zones WII unit, I'm sure you can also buy a new WII online that will work with it as well.

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ok, thanks for tour help

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Diegojp, just a heads up about region: The Fit Meter does not suffer from region lockout. That means you can buy a Fit Meter from the US, Europe, or Japan and it will work with your Wii Fit U game. Right now I am using a Europe-region Fit Meter with a Wii U console I bought in the US. I have never heard of anyone having region incompatibility problems when it comes to the Fit Meter.

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I once took apart a Fit Meter, and inside I found an IrDA transceiver module very similar (if not identical) to the TFBS4650 Infrared Transceiver. This means for communication, the Fit Meter very likely uses IrDA 9.6 kbit/s to 115.2 kbit/s SIR (but knowing Nintendo, they may have changed it a bit).

IrDA is NOT the same as what a TV remote uses. Unlike with a TV remote, there is no 38khz carrier frequency. Instead, the "frequency" of our signal depends on whether the how fast the data is being sent-- 9.6 kbit/s, 115.2 kbit/s, or somewhere in between.

If you want to know what the exact waveforms of this communication may look like, check out the IrDA Physical Layer guide (skip to pages 6 and 7 for a look at the waveforms).

Edit: I don't know the speed at which a Fit Meter communicates. But if it communicates at 115.2 kbit/s, then:

But the infrared transmitter is not turned on for the entire 8.7 microseconds. Here is an image of an IrDA waveform (from the guide I linked above) showing how 0's and 1's are sent.

  • To send a "0" bit, the transmitter turns on its infrared light for 3/16th of our bit time. In our case that's 1.63 microseconds.
  • To send a "1" bit, the infrared transmitter doesn't turn on at all. It stays dark during the entire bit time.

(I am myself interested in someday taking a look at Fit Meter IR communication.)

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> Great find! <

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