There’s still plenty of useful hardware out there that uses an RS-232 interface ... Inside the SerialChiller is an ESP32, a MAX3232 line driver, a LM1117 linear regulator, and a few passives.
Single-board computers have been around a long time: today you might be using a Raspberry Pi, an Arduino, or an ESP32, but three ... Pi extended with an RS232 Hat. This add-on board comes with ...
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