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Topic: Share tips you have come across (Read 124748 times) previous topic - next topic

larryd

#450
Jan 19, 2018, 05:13 am Last Edit: Jan 19, 2018, 05:15 am by larryd
If you have a tight fitting head on the screw, you can cut it down with a file and a electric drill.




To protect the threads, thread the screw into a standoff.




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venquessa

A few from my palette of neat tricks:

A pair of pliers with an elastic band around the handles makes a very convenient desk vice for soldering.  CAreful of your fingers if it slips and they snap shut!  I have the scars to prove this hurts :(

Blu tack or putty can be used to hold things in place while soldering, but can leave residue if the blutak gets hot.

Servo leads (JR/Futaba) make convenient 3 pin leads with already attached male or female header pins.  They are cheap and available in large multi-packs.

A simple hardware store 20W/30W/50W 12V halogen spotlight bulb can be used to create a nice hefty load on a DC circuit.

You can use the built in LED of the arduino to flash error codes when you have no serial or screen attached.  Blink the LED as a heart beat, on error, flash it much more rapidly.  So 1 flash = success, n flashes = error code.


Watcher

Quote
You can use the built in LED of the arduino to flash error codes when you have no serial or screen attached.  Blink the LED as a heart beat, on error, flash it much more rapidly.  So 1 flash = success, n flashes = error code.

Excellent idea!

larryd

#453
Jan 31, 2018, 05:29 am Last Edit: Jan 31, 2018, 05:34 am by larryd
Make yourself a simple but very useful Logic Probe with Logic Pulser.
Resistors, diodes and LEDs are 1206.













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larryd

#454
Jan 31, 2018, 05:40 am Last Edit: Jan 31, 2018, 05:41 am by larryd




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larryd

#455
Feb 04, 2018, 11:53 pm Last Edit: Feb 05, 2018, 12:23 am by larryd
I find there are many times when I need to access an Arduino header pin with several external devices.

You can make a simple interface with male and female headers.
Cut a 6X1 male header and two 6X1 female headers.
Solder them as shown in the images below.

If you have a long pin (stackable) female header, you 'don't need the male' header.   :smiley-confuse:








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TomGeorge

Everything runs on smoke, let the smoke out, it stops running....

larryd

#457
Feb 07, 2018, 05:37 am Last Edit: Feb 07, 2018, 05:39 am by larryd
Got to get my inventory under control.   :smiley-confuse:

I did have some stackable female headers.

These turned out much better.






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larryd

#458
Feb 07, 2018, 10:23 pm Last Edit: Feb 24, 2019, 04:26 pm by larryd
If you have access to a Logic Analyzer or a Storage Oscilloscope, you can use them to time events when troubleshooting your code.
A write to pin D13 on the Arduino using the PINB command, toggles that pin's state.
Toggle: if the pin was ON it goes OFF, if it was OFF it goes ON.
examples:
PINB = 0x20 // Toggle D13 ATMEGA 328
PINB = 0x80 // Toggle D13 ATMEGA 1284 or the ATMEGA 2560
Having two of these commands in a row gives a pulse of ~62.5ns (nano seconds) for 16Mhz clocks.
Creating a pulse on D13 can be used to mark the being of some code.
Adding a second pulse on D13 at the end of that code times how long that code took to execute.
- The first image shows the timing relationship between the two PINB = 0x20; instructions, ~60ns.
- The second image shows how long it takes to go from the end of loop() back to the beginning ~1.13us and it shows the time it takes to go between the two pulses ~100us.







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larryd

#459
Feb 13, 2018, 06:00 am Last Edit: Feb 26, 2018, 09:16 pm by larryd
PCB price comparisons.    <----<<<<



Online gerber viewers:

Upload your zip file
https://circuitpeople.com/   <----<<<<

Upload your zip file
http://www.gerber-viewer.com/default.aspx   <----<<<<

Upload gerber files, one at a time (not zipped)
http://paragonrobotics.com/halo-s/#website/free-tools/gerber-viewer/   <----<<<<







EDIT
This site needs you to drag your non zipped file(s) onto the web page.
You then re-assign your files to equivalent surface names.
You can then orbit the 3D PCB rendering using your mouse.
http://mayhewlabs.com/webGerber/   <----<<<<

http://mayhewlabs.com/3dpcb  







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GreyArea

#460
Feb 16, 2018, 04:52 pm Last Edit: Feb 16, 2018, 07:37 pm by GreyArea
The little bits of sealant that you clip from IP68 LEDs make really good anti slip feet. Just add some double sided tape to the (conveniently) flat side.

See photos (if they work) and check video...

Free feet!

Boardburner2

Ipad photos are too big you have to crop them to under 1 Mb size.

GreyArea

Ipad photos are too big you have to crop them to under 1 Mb size.
It wasnt the size...iOS labels them "jpeg"...same as jpg, but not recognised here.... fixed now and uploaded.

larryd

#463
Feb 28, 2018, 04:56 am Last Edit: Mar 15, 2018, 08:51 am by larryd
The old SMD hold down tool worked well but it was a bit tall and moved too easily.

This new hold down is much better and puts more pressure on the SMD devices.

The SS rod is made from a 2mm bicycle spoke.
A 3/4" magnet gives more holding power.


The work surface is a 403 stainless steel sheet.


The hold down works better with 3/4" magnet.





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larryd

#464
Feb 28, 2018, 04:57 am Last Edit: Feb 28, 2018, 05:03 am by larryd







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