I am using the arduino pro mini 3.3 volts. i have been powering an RTC chronodot, the 1306 oled Monochrome 0.96 128x64 OLED Graphic Display - STEMMA QT : ID 326 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits , ms5541 pressure sensor http://www.meas-spec.com/product/t_product.a…

Arduino pro Mini 3.3 V powering issue

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