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What have I done??

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Reply #20 — Posted 4yr ago
by Dave McLaughlin | Legend | 58,471 exp
Reply #20 — Posted 4yr ago
by Dave McLaughlin | Legend | 58,471 exp
mhectorgato says:

I got these as well, but they are useable for me only up close -- so I use them for inspection: http://www.ebay.com/itm/20x-Jewelers-Magnifier-Magnifying-Glasses-Eyeglasses-for-Gold-Silver-Jewlery-/360625410545

I didn't like things like that as it meant you had magnifying for all vision areas.

I got a local optician to make up some bifocals (old folks glasses as I call them) with plain vision on top and 3 and 4 x magnification on the bottom. I got 2 pairs. $40 each. Bloody great for close PCB work and you can look through the top at schematics and PC screen etc without having to lift your glasses all the time.

The 4 x is great for those 0.5mm pitch connectors.

Smiley

PS... Nice work Jason.
1 like
Reply #21 — Posted 4yr ago
by HughB | Hero | 18,611 exp
Reply #21 — Posted 4yr ago
by HughB | Hero | 18,611 exp
Jason says:

Well, they cooked after a couple of tries. The heat doesn't seem completely even in the reflow so some experimentation is required I think.

However, there seems to be a problem that I don't have the test equipment, patience or eye-sight to deal with tonight. Sad I don't think there can be much of a problem but DfuSe doesn't see the board. I'll have a dig around tomorrow and let you all know.

If anyone has experience of troubleshooting this type of stuff I'd welcome your insight or thoughts.

See you tomorrow.

One thing I've seen is that the STM pins sometimes don't quite solder or bridge. Hot air gun and flux usually fixes that. The other as you have seen is the USB doesn't fully solder. It's quite large and if it has kapton tape on top it reflects heat so you get a dry joint. I've has at least three Threadneedles with exactly the same problem which was easily fixed as you found.
Top work fella Smiley
9 likes
Reply #22 — Posted 4yr ago
by Jason | Hero | 14,143 exp
Reply #22 — Posted 4yr ago
by Jason | Hero | 14,143 exp
And finally, after a couple of days of craziness and probably a visit to the opticians I managed to get the BLE and I2C to both my LCD and EEPROM working. The WP8.1 app connects to the BLE, retrieves the on-time for the board, allows the frequency control of the LEDs and allows messages sent from WP8 to be displayed on the LCD. The frequencies are stored in EEPROM and retrieved upon power up to the timing can be set OTA and forgotten about. No more clumsy or expensive interfaces required. Just BLE and forget it.

Here's the video. Let me know what you think.


http://youtu.be/VHiztQ5TMco
[video][/video]

Not to decide what to do next Huh WiFi, Ethernet, more I/O. Actually, a board for the LCD is top of the list. with I2C I only need two wires, and can bus-share with other things too. Sneaky peak below.
Reply #23 — Posted 4yr ago
by .Peter. | King | 27,509 exp
Reply #23 — Posted 4yr ago
by .Peter. | King | 27,509 exp
Nice work, congrats !

Are you using Altium ?
Reply #24 — Posted 4yr ago
by Jason | Hero | 14,143 exp
Reply #24 — Posted 4yr ago
by Jason | Hero | 14,143 exp
@PiWi - yes I am. It's a lot easier than the software I use in the office.

Glad you like the post. Happy to share what I've learnt and been taught anytime you fancy getting your feet wet.
Reply #25 — Posted 4yr ago
by mhectorgato | King | 37,168 exp
Reply #25 — Posted 4yr ago
by mhectorgato | King | 37,168 exp
@Jason -

What do you mean by "high-side switching"?

Also what firmware are you using?

You, Mr WikiLeaks and others have inspired me to work on my own mCu board again!

Thanks for sharing.
Reply #26 — Posted 4yr ago
by Jason | Hero | 14,143 exp
Reply #26 — Posted 4yr ago
by Jason | Hero | 14,143 exp
@mhectorgato - Cerberus-family V4.3.3 firmware used.

This device for power switching - http://www.infineon.com/cms/de/product/discretes-and-standard-products/high-side-switches-for-industrial-applications/ITS711L1/productType.html?productType=ff80808112ab681d0112ab7036582ae2 I saves a load of discretes.

Just don't forget to connect GND of both halves! You know who you are. Embarrassed
1 like
Reply #27 — Posted 4yr ago
by Justin | Superhuman | 90,900 exp
Reply #27 — Posted 4yr ago
by Justin | Superhuman | 90,900 exp
@Jason - Whistling
Reply #28 — Posted 4yr ago
by Jason | Hero | 14,143 exp
Reply #28 — Posted 4yr ago
by Jason | Hero | 14,143 exp
@Justin - I didn't name names. Naughty
1 like
Reply #29 — Posted 4yr ago
by Dave McLaughlin | Legend | 58,471 exp
Reply #29 — Posted 4yr ago
by Dave McLaughlin | Legend | 58,471 exp
Jason says:

This device for power switching - http://www.infineon.com/cms/de/product/discretes-and-standard-products/high-side-switches-for-industrial-applications/ITS711L1/productType.html?productType=ff80808112ab681d0112ab7036582ae2 I saves a load of discretes.

These high side switching devices are great. Very robust and as Jason says, saves on part count. They may be a little higher in price but they make up for that in capability. I use them all the time when driving solenoids or relays external to my system as they can handle shorted outputs. You never know what the client is going to do with your system Smiley

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