Yes, you are absolutely right, using a board with several real hardware serial ports is the obvious solution. That obvious solution is named “Arduino Mega” and generally is priced at $60.

Nextion Arduino library provides an easy-to-use way to manipulate Nextion serial displays. Users can use the libarry freely, either in commerical projects or open-source prjects, without any ...

In the current setup, pins D10 and D11 of the Uno act as programmable TX and RX under the Software Serial library. The loudspeaker output pins ... After downloading & installing the third library, ...

Automate any workflow Packages ...

Arduino power management library key features: Battery monitoring – Reports battery metrics such as voltage, current, percentage, and temperature.; Battery health tracking – Monitors battery health ...

But if you *still* want to dig into this, just get any of the six versions of software Arduino.cc has released in 2015. They all have SPI transactions build into the official SPI library.

The Arduino Wire library is a core aspect of Arduino's integrated development environment, or IDE, and is a must-have if you're using sensors or extra microcontrollers in your project.

To start, you need to buy an Arduino. It comes pre-assembled or, for those handy with a soldering iron, in kit form. A fully assembled Diecimila board from the excellent Make costs just $35.