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X Y Zach humbly asks for your help... Answered

Hey there Brochachos,
           Ok, having just dug in on my first project, I'm more than overwhelmed by the sheer volume of 'stuffs' I need to learn to accomplish my goal.  Howevever, having done a substantial amount of reading, I believe I've got a fairly focused question that can hopefully pull a concise answer out of the beautiful woodwork of this community.  Onward...

I'm trying to interface a gantry style xy table that uses some softpots as positions sensors for the x and y axes.  I want to send this analog signal wirelessly to two servo motors that will respond to this analog signal accurately, with minimal latency, and no jitter.

As a fairly new egg in the DIY self world, I stubbornly cling to Arduino for comfort and the xbee modules seemed like a good fit, but the workaround to transmit an analog signal seemed troublesome and the servos always seem to develop a Parkinson's syndrome of sorts. (at least with the builds I saw).

The question...   What transmitter/receiver is both extremely amateur friendly, with regards to setup, and can also get the signal (sans Internet connection)  at least 100ft to the receiver where it gracefully manifests itself on the servos as smooth motion.  If you don't have a definite answer, pointing me in the right direction of relevant reading is also greatly appreciated.  If there is anything I've left out, just ask.  Thanks in advance, I love you, but not like that...



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9 years ago

Jitter can be eliminated in software, by appropriate use of digital filters, like the "exponential forgetter" or first-order hold.

Digitising the signal is just what you have to do - what's the problem ?

You can't be doing it breathtakingly fast, because your servos won't respond that fast in turn.

Xbee is a brilliantly conceived little package to do what you want.