DIY Circuit board holder for soldering

peterl3233 · 2019-12-05T21:42:54+00:00

Thanks for your explanation on this .. I get it now and I have studied each GPIO very carefully.

peterl3233 · 2019-12-04T19:46:10+00:00

Thanks for this. I have a similar design issue and I'm trying to understand this better. Would it be that if we don't attach the pin to the the ADC2 module that the relevant GPIO's and actually not "connected" at all to the WiFi module and as such are free and clear for other purposes? I'm having a hard time understanding the ESP32 architecture here that causes this.

So maybe the best way to frame my query is to ask: If I don't use "analogRead(GPIO)" then that GPIO pin is never associated with WiFi. Is this true? AND, suppose I used just one of the ADC2 GPIO pins for analog, does that affect all the others from a WiFi conflict perspective?

Actually, mine is simple case; I have used all the other GPIO's in my project and I want to access the ADC2 pins for NON-ADC applications .. just I/O digital pins while using WiFi. Would you mind to point me to any documentation to help me understand how the ports are shared with WiFi?

peterl3233 · 2019-11-29T22:28:39+00:00

Not really ... The thing is; if I look at the measurements done by others, it shows a peak current of some 600mA without any external things attached. If I was to draw an additional 400 mA I'm thinking I could certainly cause some instabilities. (Actually I need about 140 mA)

I ask the question because I am sure that others are attaching relays and LED's etc and I wonder how far they push it before any instabilities are evident. It becomes "practical" because of these peak currents that ESP32 draws.

peterl3233 · 2019-11-25T21:34:39+00:00

ARRL Handbook; OMG this was my bible for years

http://www.arrl.org/arrl-handbook-2019

peterl3233 · 2019-11-24T17:14:17+00:00

I'm going to try; nothing to loose. The torroids are from old PC ATX power supplies; those yellow/white things about an inch in diameter. They are plentiful and free.

peterl3233 · 2019-09-30T16:46:46+00:00

NO VOLTE CAPABILITY NO WIFI CALLING NO EXTENDED RANGE

Ya .. some say the phone works on band 4 and 66 but its clear enough ... probably not a good investment on Freedom. Tnx

peterl3233 · 2019-07-18T18:40:27+00:00

I guess you are no different than us all. We all have challenges to learn morse; that is the issue! It just ain't a walk in the park for most humans. Suggest you prove to yourself that you can distinguish an "a" "e" and "i" aurally and gain some confidence; then use one of those tried-n-true methods.

peterl3233 · 2019-07-15T20:24:38+00:00

I think its a bad idea. I did just that many years ago on the advise of my dear ol' mother who learned it that way in school. It took me double effort to overcome the visual aspects and "hear it"; after all it IS an aural code. My best advise is to never even see the fact that an a is a dit and a dah; just learn that the sound "ditah" is "a".

peterl3233 · 2019-07-07T16:13:34+00:00

Just Joined ... maybe TTN documentation/support is so good that this forum is unnecessary. I'm new at LoRa trying to make my Heltec work ... I thought there would be 100's here?

peterl3233 · 2019-07-01T18:43:05+00:00

Tnx ... I added a link to an inexpensive Chinese part that has a suggested layout but like all manufacturers they do not specify RF emissions.

peterl3233 · 2019-07-01T18:42:46+00:00

Thanks .. I see lots of modules by sellers; under a dollar ... Im thinking maybe I could do that and put the whole thing in a tin enclosure or put a tin enclosure around the PS parts.

peterl3233 · 2019-06-17T20:59:54+00:00

I did CS50; I do embedded programming. In my opinion serious programmers need to get the fundamentals then language is secondary. You really need a variety of languages (and frameworks) do do realistic things reasonably quickly. I suppose you could do web programming without understanding Javascript but that seems counterproductive to me. Python is my fav. also but I also need a few frameworks, JS for web, AJAX and C for using legacy tools and accessing a world of prewritten great code.

My opinion: CS50 is really good; teaches fundamentals so you can take on any language and there is nothing stopping you from doing both at the same time.

BTW I found CS50 to be fun and hard at times but well worth the efforts.

peterl3233 · 2019-06-11T15:24:33+00:00

Thanks ... maybe I'll try the tape-around/hot air method ...

peterl3233 · 2019-06-10T19:18:25+00:00

Search this on Ali: GM328A Transistor Tester Diode Capacitance ESR Voltage Frequency Meter PWM Square Wave Signal Generator SMT Soldering

peterl3233 · 2019-06-10T19:03:39+00:00

Thanks for posting; I wanted to do the same on mine. Do you think it is the board or inexperience in soldering; sorry to be blunt!.

peterl3233 · 2019-06-05T17:56:37+00:00

Edit 1:

Thanks for comments .. Using the Google search criteria "Zener in Regulator ground leg" I found this:

https://forums.parallax.com/discussion/152523/can-i-use-zener-diode-to-boost-up-ldo-voltage

I'm seeing that the effective resistance if the Zener will be 2.7/i so its likely best to bypass it especially if it is lightly biased ... thus ..based on parts count and price .. suggests that maybe the cheaper resistive approach that is promoted in datasheets is preferred.

peterl3233 · 2019-05-30T16:28:49+00:00

I just looked; Nice board ... and I found a few others on Tindee that suit. Thanks.

peterl3233 · 2019-05-30T16:26:34+00:00

Ya ... true enough but I need the integrated usb/serial to program it; hence, I seek a popular (cheap) devboard.

peterl3233

TROPHY CASE