Some mistakes I made

 I picked these up almost 5 years ago thinking I could resell them:

However, I found that they were nice looking imitations.

Why not decorate? Enter Blinkenlights / LED Matrices>>

To put these parts together I will follow:

Controlling an RGB 8x8 Matrix using multiplexers and a single MAX7219

KingBeetle1966
https://www.youtube.com/watch?v=4iFc3omSHCw

HUGE LED matrix with Arduino

Electronoobs
https://www.youtube.com/watch?v=v1vRjOU_pGA

Planning JSON for Heltec CubeCell Ardunio and ESP32-LoRa Arduino (continued from April 10th)

 Here are some additional links:

https://www.learnrobotics.org/blog/parse-json-data-arduino/

https://diyprojects.io/get-started-with-arduinojson-v6-arduino-library-for-handling-json-objects/amp/

https://randomnerdtutorials.com/decoding-and-encoding-json-with-arduino-or-esp8266/

https://www.arduino.cc/reference/en/libraries/arduinojson/

https://blog.arduino.cc/2020/08/31/how-iot-device-provisioning-to-the-arduino-iot-cloud-works/

https://github.com/chrismoorhouse/ArduinoJWT

https://forum.arduino.cc/t/generating-and-decoding-jwt-with-arduino/588233/2

Connect to ESP32 over Serial via Node.js and later websockets

 https://www.npmjs.com/package/serialport [Node.js Serial port]

Birectional Communication between Heltec CubeCell and Heltec LoRA ESP32 (V2)

 Actually, this was a huge step: https://www.youtube.com/watch?v=3XOYRV0kSuo  to get something like described at the end of this call (https://www.youtube.com/watch?v=Z8Wf7Srsg5U) to work. I think the next step would be to try to get this to work. https://simplerpc.readthedocs.io/en/latest/index.html . Ultimately, it needs to use Ceramic's EIP-2844 interface with the HTTP API as well. I have not done a lot of worked with RPC before,
but ultimately it seems to be a way to expose a function as if it were local. The Heltec CubeCell needs some sort of bytes to trigger execution of a signing function, and the Node.js server speaking with a Ceramic node needs some sort of bytes (if needed) from the Heltec ESP32.

LoRa and LCD displays

 #368 How to build performing antennas for LoRa, WiFi, 433MHz, Airplanes etc.(NanoVNA, MMANA-GAL) - Andreas S.

https://www.youtube.com/watch?v=6cVYsHCLKq8


How to build a homemade mini-PLC using simplified prototype process step by step

https://www.youtube.com/watch?v=6-9G1r2rqhg

Using LCD Displays with Arduino
https://www.youtube.com/watch?v=wEbGhYjn4QI

Crystal Oscillator Explained

https://www.youtube.com/watch?v=YzcKQWwkzWs

I found a review for the DS0138 on the EEVBlog mailing list

 Here is the link:
https://www.eevblog.com/forum/testgear/jye-tech-dso-138-review-and-performance-testing/


I have the DSO138 Mini


However, it appears for be bad for square waves. Perhaps I should use a logic analyzer instead??

https://articles.saleae.com/logic-analyzers/logic-analyzer-vs.-oscilloscope
https://www.sparkfun.com/products/15033
https://sigrok.org/

https://www.youtube.com/watch?v=KiDDL5xtnG0 [Cheap logic analyzer + Sigrok pulseview = timesaver (LHT00SU1)]

I was looking for logic analyzers viewing the output of a 55 timer. This is not it, but it seems interesting: http://exploringbeaglebone.com/chapter4/

Logic analyzers will sample a sine wave to get a square wave output:
https://articles.saleae.com/logic-analyzers/how-to-use-a-logic-analyzer

This may mean that I can get at least a qualitative representation of a high frequency sine wave.

Anti-Static Mat:

https://www.instructables.com/DIY-Anti-Static-Mat/

https://elimstat.com/static-dissipative-mats-vs-conductive-mats/

https://www.youtube.com/watch?v=EiNQbWZFe-E

https://www.adafruit.com/product/1168?gclid=EAIaIQobChMImJCg4Z2H8gIVYWpvBB0DawMmEAQYAiABEgIYcPD_BwE