Search found 232 matches

by Garth
Wed Oct 20, 2021 1:33 pm
Forum: Online Shopping
Topic: Beginning C for Arduino: Learn C Programming for the Arduino
Replies: 14
Views: 126391

Re: Beginning C for Arduino: Learn C Programming for the Arduino

The link went dead; so here's one that works:
MIT graduates cannot power a light bulb with a battery.
https://www.youtube.com/watch?v=aIhk9eKOLzQ
by Garth
Wed Oct 20, 2021 1:23 pm
Forum: Member introductions
Topic: progressions from ham radio to home-made workbench CPU, PICs
Replies: 2
Views: 9416

Re: progressions from ham radio to home-made workbench CPU, PICs

I'm not able to edit my post above, apparently because the forum software no longer allows lots of hypertext links; so here are some more links to newer articles on my mostly 6502 site, without the hypertext: My workbench computers: http://wilsonminesco.com/BenchCPU/ Self-modifying code on 65xx: htt...
by Garth
Mon Oct 18, 2021 3:03 pm
Forum: Thoughts on DAC's
Topic: Is MCP4728 able to generate different waves with different voltage and frequency simultaneously?
Replies: 1
Views: 265

Re: Is MCP4728 able to generate different waves with different voltage and frequency simultaneously?

It's not a signal generator. I only converts numbers to DC voltages. It has four digital-to-analog converters (DACs), so it can output four different ones at once; but each voltage will remain stable until you write a new number to the particular DAC. For example, you might write to channel A the nu...
by Garth
Sat Sep 25, 2021 1:20 pm
Forum: The off topic lounge
Topic: MCP4728 DAC and MCP4725 interchangeable?
Replies: 1
Views: 307

Re: MCP4728 DAC and MCP4725 interchangeable?

There are so many data converters on the market (probably thousands!) that it's hard for any one person to be familiar with even 1% of them. You'll probably have to just comb through the data sheets for these two, looking for differences, and you might want to just get them and experiment with them....
by Garth
Tue Apr 13, 2021 8:57 am
Forum: The off topic lounge
Topic: great danger from cell-phone use
Replies: 27
Views: 39778

Re: great danger from cell-phone use

matrakar84 wrote:
Tue Apr 13, 2021 6:06 am
SAR provides a straightforward means for measuring the RF exposure characteristics of cell phones to ensure that they are within the safety guidelines set by the FCC.
FCC guidelines are not nearly good enough, as evidenced by links given further up.
by Garth
Fri Feb 05, 2021 7:50 am
Forum: Great video clips
Topic: video showing how the insides of PCB holes are plated
Replies: 0
Views: 3576

video showing how the insides of PCB holes are plated

Video: "How Does Copper Get Inside of a VIA Hole in Your PCB - Do you know this? (with Kailey Shara)"
https://www.youtube.com/watch?v=ukfsupePkOM
by Garth
Tue Dec 15, 2020 11:38 am
Forum: PCB Design
Topic: Analysis of the basic process and steps of PCB circuit board design
Replies: 3
Views: 13378

Re: Analysis of the basic process and steps of PCB circuit board design

SukiEgan, the standard parts like resistors and capacitors will be in the libraries that came with the CAD. You don't have to make them unless you want greater density (like I did). "ICs" stands for " integrated circuits," not coordinated circuits! I personally do not do my schematics in CAD. There...
by Garth
Sun Aug 23, 2020 3:14 pm
Forum: Brads Projects University
Topic: oximetry
Replies: 1
Views: 5450

Re: oximetry

What do they detect? Transmission of a particular wavelength of light compared to another? I'm sure there's no need to re-invent the wheel though. I think these have even been used in aircraft, for the pilots to make sure they're getting enough oxygen, especially in non-pressurized aircraft where th...
by Garth
Mon Jul 13, 2020 11:46 am
Forum: The off topic lounge
Topic: A digital dark age may be coming, Google VP warns
Replies: 18
Views: 25363

Re: A digital dark age may be coming, Google VP warns

I'm trying to post a reply, and I get the error message:
Forbidden

You don't have permission to access this resource.
Let's see if this simpler one will post. It does. Why not the other? I have a picture in it and a link to a 90-second demo video on my site.
by Garth
Wed Jun 17, 2020 8:47 am
Forum: Programming PIC's with Swordfish Basic
Topic: I2C LCD Displays with PCF8574
Replies: 6
Views: 18526

Re: I2C LCD Displays with PCF8574

It sounds pretty easy. If its I²C clock rate is limited to 100kHz (max of 12.5KB per second), you won't be overrunning the LCD's ability to keep up for most instructions, especially with the 4-bit interface. I should probably get some of those ICs to have on hand and play with.
by Garth
Wed Jun 17, 2020 6:48 am
Forum: Programming PIC's with Swordfish Basic
Topic: I2C LCD Displays with PCF8574
Replies: 6
Views: 18526

Re: I2C LCD Displays with PCF8574

Thanks. I've usually used these LCDs in 4-bit mode, with 6 lines (just grounding the R/W, which just means you have to give it enough delay that you know each instruction is finished, since you can't poll it). I have working sample code in different forms at http://wilsonminesco.com/6502primer/LCDco...
by Garth
Wed Jun 17, 2020 4:47 am
Forum: Programming PIC's with Swordfish Basic
Topic: I2C LCD Displays with PCF8574
Replies: 6
Views: 18526

Re: I2C LCD Displays with PCF8574

That looks nice. Do you sell the I²C module? I don't see any way to buy it. Actually, I'm sure it could be used for a lot of other things besides an LCD, right? And there are undoubtedly a lot of I²C-to-parallel adapter ICs on the market, probably from Maxim and others; but this one is already made ...
by Garth
Tue Apr 07, 2020 7:35 am
Forum: The off topic lounge
Topic: great danger from cell-phone use
Replies: 27
Views: 39778

Re: great danger from cell-phone use

It would be interesting to see the results of an experiment (or multiple experiments) that have all the correct control measures in place.
Dr. Devra Davis with data on studies with controls:
https://www.youtube.com/watch?v=BwyDCHf5iCY
by Garth
Fri Feb 14, 2020 4:19 pm
Forum: Brads Projects University
Topic: soldering SOJ (& similar) parts without special equipment
Replies: 7
Views: 19483

Re: soldering SOJ (& similar) parts without special equipment

Here's another one, an SOIC. These were taken with a very cheap camera. First I tack one corner, and get the IC really straight, then tack the opposite corner, and again make sure I haven't rotated it out of being straight. Then I do the two remaining corners. Then I flood a whole side with solder, ...
by Garth
Wed Dec 11, 2019 6:13 am
Forum: PCB Design
Topic: Analysis of the basic process and steps of PCB circuit board design
Replies: 3
Views: 13378

Re: Analysis of the basic process and steps of PCB circuit board design

I find a lot of problems with the post above. For starters, I would recommend going through Dr. Howard Johnson's articles indexed at https://web.archive.org/web/20120302190123/www.sigcon.com/Pubs/pubsKeyword.htm . He is quite an industry guru, and the author of "High Speed Digital Design: A Handbook...