Wireless "wire" 1

[AJustice]

Hi, I was wondering if anyone had a "low cost" solution in creating a system to read a 0-5V AC signal and wirelessly transmit then "reproduce" the signal. I need "high" accuracy, say +- 0.5%

 

[benta]

Define "system"
Semiconductor level?
Module level?
Boxed Solution level?

Define "low cost"

There are solutions for all, but your question begs for clarification.

Benta.

 

[AJustice]

Basically, I want a set of ICs that I could provide power and an AC signal to and "replace" a length of wire. They would only "talk" to each other, allowing for multiple sets of ICs in the same area. The semiconductor level is prefered(cost), I have found some "boxed" sets for $150+, but I am looking for more of a $5-$20 range.

 

[MacGyverS2000]

PIC with a 10-bit A/D (better to find one with a 12-bit an throw away some bits after preprocessing) and a Bluetooth module. Cost you about $10 in materials and some programming time.

Done.


Dan - Owner

http://www.Hi-TecDesigns.com

 

[benta]

Dan you're a bit optimistic on the BT module. More like 20$ if you want one with stack (and you do, due to regulatory issues).

Benta.

 

[AJustice]

what is "stack"? I am looking at the TI msp430rf-2500. I just don't know how "good" of a signal I would get from that circuitry. They say it has a 10bit ADC and up to 200kBps data rate. How do you get a "feel" for how accurate the sampling/ADC/DAC would be?

 

[benta]

Re "stack"

There are basically two types of Bluetooth (BT) modules:

HCI or "host controller interface". This is a very basic and cheap module that requires that you put most of the BT protocol stack firm/software) in your host controller. Only viable if you are planning to produce 50k+ units due to excessive cost of test equipment and certification (FCC, R&TTE etc.).

Port Replacement Module. This additionally features an onboard controller containing the full BT stack. You interface to the module via a CMOS UART using AT-commands (Hayes), just like a modem. No certification issues, these modules can be used out of the box as they are already certified. I would go this way in your place.
Example here:

http://amber-wireless.de/65-1-AMB2300.html

Benta.

 

[kiwisoundguy]

Hi Guys,
I would be interested in this too, but I am after a 4-20ma bluetooth system. Basicly I need to get a current loop signal 30m (100ft) to a small LCD display box. Do you think you could kill two birds with one stone and help us both out?

Thanks in advance.