Heh, general dev board looks a little different these days
and prototyping a little more advanced
That's a few Dallas temperature sensors, 80MHz cpu board, 32K external RAM, 4MB external flash and a 1GB micro SD card. Add a little test software (http://forum.sparkfun.com/viewtopic.php?f=19&t=17217) and things have come a long way :)
Now you're just showing off lol
I know feck all about mechanics so I've got to find some way to justify my membership here ;-)
14-08-2010 #25Tim G-C
“I disapprove of what you say, but I will defend to the death your right to say it.”
(attrib. Voltaire but written by Evelyn Beatrice Hall "The Friends of Voltaire" 1906)
I hadn't used stripboard for ages until I made Les's Tacho x2. Much more used to the joys of UV boxes, FeCl3 etc. I have now resolved never to use stripboard again. It's just too much hassle checking for shorts between the strips :sad:
ecat's Eagle .brd looks good. Must investigate ...
Just a thought about the design spec. Three features of Les's design that I really liked were
- the use of the Allegro gear sensor (it's as good as gold; no messing with slotted discs/foil/Tipp-Ex etc, very reliable, very robust -- just needs to be mounted tangentially 1-2mm from teeth)
- the capacity to accommodate a non-standard number of pulses per rev (65 in the case of the ml7 bullwheel)
- a one pulse per rev output (useful for my Shumatech DRO's).
The software design already accommodates a 'divide by N' feature as Rick needs /50 for his, and I will need something for the minilathe and if I do one for the mill too Im sure that'll have a different value. I haven't yet decided how to set this.. probably a jumper and a push button... at power up if jumper present go into setup mode and each press of the button increments the 'divide by count' from 1 to 100, hold it down 5sec is increment by 10... release button for 10sec, store in eeprom
One pulse per rev is easy...
Irving,there is a way to mount a disc on the lathe...
One disc with a hole in it and mount it on the back of the spindle just behind the two locknuts,you'll have to make a short arm piece of metal for the slotted sensor to fit over the disc.
This way its covered up and out of sight.
yes, but I want more than one pulse/rev... for closed loop speed control you can't have too much information... and a sensor on the fixed gears may well be easier...
Note: if anyone reading this has a minilathe with built in rev counter... how is it done? Are there any useful parts that could be acquired as spares? I had a quicl browse for a parts list online but all of the ones I found don't detail the rev counter...
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