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Arduino Mega 2560 (clone) Review and Test (#128)

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This re-imagining of the Arduino Mega has all the features, but in a board smaller than the Uno. I test it by adding a temperature sensor (DS18B20) and a 0.96" OLED display to make a digital thermometer.

As a big fan of the powers of 2, I'm also thrilled to reach this landmark video of 128 (2^7).

Aliexpress link: https://www.aliexpress.com/snapshot/0.html?spm=a2g0s.buyer_leave_review.0.0.10736c1bJ0vM7n&orderId=3006217135313052&productId=32962969379

DS18b20 datasheet: https://docs.rs-online.com/7c2e/A700000006388546.pdf

OLED datasheet: https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf

Randomnerd tutorial: https://randomnerdtutorials.com/guide-for-oled-display-with-arduino/

Arduino and DS18B20 (arduino.cc): https://create.arduino.cc/projecthub/TheGadgetBoy/ds18b20-digital-temperature-sensor-and-arduino-9cc806

The final Arduino sketch is on my github site: https://github.com/magiccow/thermometer

Errata: my OLED is 128 x 64 pixels, not 128 x 32
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