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Member postings for jason udall

Here is a list of all the postings jason udall has made in our forums. Click on a thread name to jump to the thread.

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Thread: arduino uses ?
27/10/2014 08:39:48
Ahh just google
433Mhz rf arduino. ..
27/10/2014 08:38:29
And on the wireless front......
...http://www.amazon.co.uk/gp/aw/d/B00E9OGFLQ/ref=redir_mdp_mobile?pc_redir=1414398829&redirect=true&ref_=pe_378491_56158811_em_3p_0_0_im
Thread: On Off switch - Digital Calipers
26/10/2014 14:53:41
As to why this doesn't completely power down the device...
A few possibilities. .
Cheap ness..slide switch..moving part..more expensive than a pushbutton. .

Function. .stay powered to hold reading.. power down display to save some power. .

But your guess
26/10/2014 14:49:06
Anyone know the self discharge of the button cell ( in these devices?)

I ask since in a previous life have designed circuits pushing the self discharge limits ( ie comparable)...of the batteries powering them
Thread: LEDs ... The Good, The Bad, and The Ugly
26/10/2014 14:42:56
Andrew.thanks..but thats why I asked about current smd soldering and smd leadout versus through board lead out.. as I understand most of the heat "sinking" of the LED die is via the leadout wires so I believe the through board has more opportunity for leading heat out of the die....
The reason I think about this is many led light bars seem to cook and I would have expected better design..I suspect the difference between through hole and smd might have been overlooked...
Of course I may be wrong..it might not have been considered at all.
Thread: arduino uses ?
26/10/2014 12:43:31
Thanks Ian

Slightly missed my point..I was trying to say that even an envolved programme like MARLIN fits into that tiny 32k space.....
For bavkground I cut my micro controller teeth on pic 16c54.. devices in products... working with average current consumption of 50uA...for whole board....
Think 500 mAhr per year.....
But again thanks

.
26/10/2014 11:40:12
Oh and Andrew..Please don't stay away..
Frankly I haven't had to deal with fft etc for years and probably won't again..but didn't take any offence at your explanation.

Generaly when I see a term I don't recognise ..I look it up. .or ask..then make an assessment as to whether I need to know more..

26/10/2014 11:30:43
Audrino. .refees to a circuit board..of "open source" design..
Design in controlled and documented and different suppiers meet this design
The micro controller is an amtel( brand ) device.
The" nano" also has onboard..a usb receive/transmission chip and a 5V voltage regulator.
The latter allows running the board from 5V dc in up to 20V dc.
Thus you get a micro controller..with about 30 thousand bytes of storage ( for programme and typically a "heavy programme" like MARLIN for 3D printers takes about 10 thousand bytes)

Also on board
.four leds...one for power.two showing whats happening on the serial port ( sort of)
And one connected to pin 13..

The one on 13 is a test light..so when you get your audrino and power it up..the preprogrammed "blink" programme runs and flashes this light...
Bit dull huh?..
Now connect this marvel to your pc ( or mac) run the audrino software and send you board new instructions..the programme for reasons I haven't bothered togind out is called a sketch..but is in fact a C++ computer programme..don't get hung up on that. .load up the example "blink"..
Look this is what the circuit is doing when it flashes that light...
Change that instuction .."delay (1000) ; " to say
"delay(500) ;"..don't forget that ;
Upload this to you board.......look.the led flashes faster....

Seriously you now have the beginnings of a electronic circuit that can look at switches and analogue voltages ( 5 mV to 5V) make some decisions based on that and wiggle pins ( supply or sink 40 mA at 5V) based on those decisions.
26/10/2014 11:06:59
Frank..
For me electronics is my"trade"..
The mechanical side is less so..having to make the control systems of cnc lathes mills work I have had to pick up some of that side along the way...
That said there is something seductive about turning and doubly so about making tools to make other things..

For now maybe think of audrino as electronic leggo or possibly more correctly meccano.....
At the very least you can try an idea out quickly to see if you want to do it that way. ....

Not knocking meccano in any way ..just that one wouldn't be as proud of the coil winder made in meccano as the one made with hand cut gears....even if the coils turn out the same...
.. ( well I might be more proud of having my coils finished before the plate for the gears even arrived..if you get what I mean)

Edited By jason udall on 26/10/2014 11:09:01

26/10/2014 10:15:32
If using the nano..
There is a wonderful "breakout board " that provides copies of power pins and labeled I/O pins for ease of use..
Similarly there is an excellent "starter kit"
.breadboard ,audrino, few electronic components. .for I have seen 30 quid on amozon..other retailers are available..for those who don't already have this stuff..
For more serious application. .think of the audrino MEGA with a RAMPS board.. ( ramp = reprap audrino something polou shield)..it can take stepper driver sub boards ( the polou) up to five ( well six since two motors can share the same channel)..three heater controls with thermistor sensors..
Six limit switches. .
And thats just for starters. .this pair form the guts of many 3d printers.along with the MARLIN sketch..
..
So yeah the audrino has uses...

Edited By jason udall on 26/10/2014 10:16:40

26/10/2014 09:59:46
Starting out with the arduino can be fiddly..

For one the first gotcha is that the folder and the sketch have to have the same name..
Easily solved..use " Save As"..and the audrino programme ( pc end) will do the nessacary..
The above is only a problem if like me you are used to having to do this stuff for yourself

The other relates to the similarities between ( and { ..
I remember where I left them on the keyboard but some times can't see the difference on screen...

As you go on.. libraries are great but ..to me.. handled in the editor confusingly. .might be just me..

Anyway to any newcomer. .get an audrino ( mega or nano or which ever)..and have a play...
It will be worth the cost and certainly worth your time..( your milage may vary. . )
Thread: LEDs ... The Good, The Bad, and The Ugly
26/10/2014 09:46:44
Feeling idol just now..
Any one got a comparison of THERMAL resistance for surface mount lead free solder joint and through-hole lead-tin solder joint...because it strikes me that the thermal managment of the production lamps is significantly off
Thread: arduino uses ?
25/10/2014 21:40:04

fancy

Basic AND PLC (LADDER PROGRAMMING).. in the same device? at the sametime

look at comsol

uk dealer audon electronics

for instance the ct1820...with incuded lcd display and touch screen..

for give terseness this retyped afted this xxxxxx editor ditched it

edited to remove in temperate language ..

Edited By jason udall on 25/10/2014 21:47:35

25/10/2014 14:45:26
As to jargon
All trades/professions have there own "shared" short hands. .
Much of the time we forget that not everyone is steeped in that world..

We also talk of gauge plate ,silver steel, phosfor bronze when much of the greater herd would say "metal"..
Make no apology for none is needed when asking for expansion of a term..
Please accept mine in advance for when enthusiasm exceeds typing patience.
25/10/2014 14:32:42
Re. Target rotator..

Unless you want some sort of speed control ..I would go with a simple dc motor (perhaps a wiper motor from a car)..you get a hi ratio gear box an right angle drive for "free"..and as suggested some sort of encoder disk for the target..
If you don't need to rotate /reverse..and can rotate. Pause..rotate.. allclockwise say..the whole thing becomes ssimpler. .

Even if using an arduino .would advise the notched disc..so you can tell the arduino the target is in play or parked..
If you need to do wireless "shields" and software ( firmware?) Libraries exist..
Blue tooth is maybe a bit short range ( and vulnerable if paranoid)
I would if more than a few metres use a serial link..with an arduino each end and rs485 serial drivers..( serial communication and rs485 is a hardware protocol good for about 15 km)..
Or failing that just use twelve volt power and optocouplers at arduino ..
What I am suggesting is arduino under target near motor..micro switch sensing the "park" notch on disc..
Wiper motor turns target one way..motor relay driven directly from arduino ( 5V 200ohm coil switching whatever load and voltage of the motor..)..diode across relay coil to protect arduino.
Opto couple inputs for your switches...one wire each out to remote box along with +12V....
Add one extra button since you have arduino at motor end..."RANDOM"...
After a random number of seconds the target turns for say a random duration. ..

Thread: Align power feed units
24/10/2014 20:37:56
John. I don't know the part you are mention ing..
..I have seen simular for hydraulics...all mechanical..

Anyway..if I understand you have a control handle for fwd/reverse and concentric with that a pot. That does the speed..could you replace the pot knob with a locking type..the catch operates on the mounting spigot of the pot and locks the shaft relative to that spigot...
Thread: How do I drill square holes ?
23/10/2014 09:15:18
Btw.. being a literal soul.." how do I drill square holes"...
There are tools for this...
Too expensive and specialist for our use..
Do in simple terms..how do I drill...you can't. .
But there are more than one way to do it other than ( just ) drilling
23/10/2014 09:09:01
As above but for bigger holes more "teeth"...and file a taper say 15 degrees included ... but for one off in "easily" remade part the above works at that scale...
Watch out for distortion ..ideally you need a die to support far side..now how do we make the die...

Edited By jason udall on 23/10/2014 09:10:10

Thread: poor engineering companys
22/10/2014 22:13:51
Oops the above should have read
..sourcing minimun QUANTITY of material. ....
Maybe I should read my posts....
22/10/2014 18:33:40
When I worked in cnc turning shop..
Minimum costs for and job was about 180 quid... unless done completely as favour..
These costs were. .
Quote processing
Quality requirements assessment
Validation of customer credit
Sourcing minimum quality of material...
Special tooling
Special gauging
Last but not least cycle time...times number of parts


We oftern offered these customers..
180 quid for 1 or
180 quid for however many we could make out of 10 foot of bar. ..
Seriously it cost us as much to quote for 1 off as to quote for 14k parts..
Best approach was catch boss in right mood at get permission to get a machinist to make it for tea money....
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