Making the Memsense Mag3 IMU Wireless?

What is the data rate (and so the band width) requirement of the 30 feet transmission?

How much this Mag3 costs?

Thanks for the reply Many. The bandwidth as listed on the datasheet is 50hz. Do you think you have a solution?

The Mag3 runs about $930.

Matt.

Matt,

What I understand from the doc. is that unit provides analog outputs. So I assume you need to digitize the analog signals for the transmission. Depending on your sampling rate, number of channels, Analog to Digital Conversion Reolution and error check/correction mechanism for your digital transmission you may end up something like the following equation for your bandwidth (bits/sec) requirement (50Hz) x (2) x (number of channels) x (ADC resolution + Start/Stop+CRC) You should find this figure before searching 30ft transmission.

Regards,

Many,

Yeah, I will definitely need an ADC. I am not sure if I am able to solve that equation at this point, maybe you can help me. I want a tranceiver that can transmit the Mag3 output at full capacity. Couldn't I output everything over one channel? As far as the ADC resolution and Start/Stop and CRC I don't know these values yet, since I haven't selected the ADC. Thanks for your help.

Matt

This really looks like a neat part.

Yes, you can transmit everything over a single channel.

However, This means all data will be sent serially, One after the other. If you were to have an 12 bit ADC, as mentioned : (50Hz) x (2) x (number of channels) x (ADC resolution + Start/Stop+CRC)

Thats a lot of bits to send in 20 millaseconds (50 Hz)

Also how small is your "small footprint" ?

I think the analog output of each channel can drive a voltage-to-freq converter. Multiple PWM transmitter and receiver circuits could be used to decode each channel.

Build one and repeat. Adjust freq for each channel.

google for voltage-to-frequency converters.

hamilton