Project

General

Profile

Modular Telemetry System

Added by mirko.ugolini about 6 years ago

Hello all,

I need help!

I should realize a modular telemetry/control system.

The range should be few (1-10) meters.

Composed in this way:

a) N devices (node) to be monitored.
b) a monitoring unit that collects all information, make some elaboration and send back to the specif unit(node) some information.

So I suppose that I need 2 * N RT (reciver/tansmitter) modules.

N.B. All the device (node) shoud /transmit at the same time

Which jeelabs modules do you recommend to buy?

Best regards

Mirko Ugolini


Replies (3)

RE: Modular Telemetry System - Added by martynj about 6 years ago

Mirko, what data rate is required? Each reporter needs to send how much data/how often? Is data loss acceptable?

RE: Modular Telemetry System - Added by mirko.ugolini about 6 years ago

Hi martynj,

the dynamics of the node to control is not very high,

so I think that 2-5 samples per seconds should be enough.

Thanks

mirko

RE: Modular Telemetry System - Added by martynj about 6 years ago

Mirko, with low data rates like that, it should be enough to use a single master collection point (like a JeeLink to connect directly to a USB port if there is a monitor PC involved). The master can poll each sensor point (maybe a JeeNode or JeeNode Micro) to ask for the latest data, send parameter settings etc.

A new sensor node added to the system can issue a broadcast at start up, which the master will pick up and then send the sensor what ID to use etc.

If you scan the Forums (this one and the old one (forum.jeelabs.net) for ‘polling’, you will find several threads on this topic to guide you.

Your design needs to allow for some packet loss (the ISM bands are quite busy, depending on your location). If the data is critical, then you can use the ‘ACK’ system to recover from packet loss, or often, if the data is constantly changing, ignore the packet loss since the next data point polled may be just as useful as recovering the ‘lost’ value.

    (1-3/3)