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https://esp32arduino.com/ This may be simple for you, and once upon a time, I probably understood it. But being over 70 years old and coming back to “programming” or “coding” or whatever you young folks call it, it has involved a lot of head scratching. I use this page as a reminder to myself, because by tomorrow I will have forgotten it already. But here is what I figured out about functions, and passing variables (or arguments) one way and the other in Arduino or ESP32 using the Arduino version of C++ . Maybe this will help someone. Arduino functions and passing arguments or variables BASIC To call the function: myFunction(

Arduino NMEA GPS code to replace paddle wheel transducer uses GPS module TTL to RS232 converter, all code and wiring included. While it is all in the code, the kind of pseudocode is: Read GPS output at 9600 baud (that is the GPS default) Get rid of everything except $GNVTG sentence Convert $GNVTG sentences into valid $SDVHW,0.0,T,0.0,M,0.95,N,0.0,K*7E sentence (the SD seems to be something Garmin MAY want) create and add a checksum in after the conversion add the carriage return and line feed (yeah, totally weird eh) send it out of the Arduino as TTL (0 to +5v) at 4800 baud (4800 is what Garmin wants) convert the TTL signal

This is almost too simple to post, but hey, someone may be stumped. I am only including a short code snippet, and it WILL matter where this function appears. At least it does in this case as I am using it to store a Preference value in esp32 flash memory. As it is in “setup()” it is only going to run once, so there is no second chance, as there often is in parsing variables in a function that runs in a loop. Without further ado, the code.

For how it works, see the comments in the code. the serial output is below the code to see the code I used to come up with this see:https://www.upesy.fr/blogs/tutorials/what-are-interrupts-in-esp32-with-examples-for-arduino-codeandhttps://lastminuteengineers.com/handling-esp32-gpio-interrupts-tutorial/ Using esp32, which lets you use attachInterrupt() on every pin, unlike with the Arduino, which depends on the card and only works on some pins. The code can also be a little simpler (not explained here). The isr function capability is truly powerful, particularly when combined with the struct (structure) note the use of the code, IRAM_ATTR DON_isr() that forces RAM to be used instead of flash. DON_isr is just the name of the function, You can name it whatever you

How to easily create a function that can be called from anywhere using existing code that already works. Use this approach to clean up your code, make it “readable” as well as easier to edit, maintain and improve. This is done in the visual micro IDE, which runs on top of visual studio. Both apps are free, but you can pay the visual micro people $12 a year for an astounding piece of work. But the technique shown here will work on ANY editor, including the Arduino IDE. It is not rocket science and there is nothing unique or original here, but it took me many hours over many months

this is the slave code , master code is on another page

This is part of a larger project that uses the esp32 as a tank level sensor for a boat. But of course, it could be used in any situation that uses non-metallic tanks. This code handles up to three slave cards, but it could be extended to more than three. The code that does the job is mainly one function, but some variables are set in other places and the standard esp32 connection code has some flags added to it, but is primarily that provided by Espressif (the people who make the esp32). At present, the MAC address of the master card does need to be hard-coded into the sketch

This works with an ESP32, I have not tested with an Arduino, but it should work. It relies on the WiFi.H Library written by some genius

at the page https://docs.platformio.org/en/latest//core/installation.html#windows the doc shows the following You need to edit system environment variable called Path and append C:\Users\UserName\.platformio\penv\Scripts; path in the beginning of a list (please replace UserName with your account name). To solve PlatformIO CLI problem with PATH What I have found is that you DON’T put a ‘ ; ‘ semicolon at the end but you DO put a ‘ \ ‘  C:\Users\UserName\.platformio\penv\Scripts\ and this is a back-slash , (not the forward // slash that you may be more used to using) THEN restart widows. How I got there was go to the search in the lower left, corrner in Windows-10 , type in environment variables, click on the thing that

Okay I am very very annoyed. I have been using Raymarine for well over 20 years and probably before that. SeaTalk , SeaTalk2, nmea 0183 to SeaTalk, Mostly been very happy. On my second Axiom but come on, this SeaTalk-ng cable is GARBAGE. It could just be called SeaTalk-G . Yes, I realize the concept was good, and they did everything they could to be backward compatible, koodoos for that. But over $50 for a 1 foot cable?? $30 for and end-of-line resister that you can not remove from the connector without breaking it. What is below is simply a shared opinion from a guy who studied electronics back when