Arduino 33 V Output. If the pin has been configured as an OUTPUT with pinMode its voltage will be set to the corresponding value. But now the coolest new sensors displays and chips are 33V and are not 5V compatible. The NodeMCU micro-controller is similar to Arduino micro-controller board. The 33V regulator is.
This is the case of the Arduino Ethernet Shield. Perhaps the author can offer some guidance. The output of a 33V logic circuit will drive the INPUT of a 5V logic circuit technically this is marginal but works in practice. If the pin is configured as an INPUT digitalWrite will enable HIGH or disable LOW the internal pullup on the input pin. Breadboard view of an Arduino Nano connected to two force sensing resistors FSRs and a speaker. Use a small 5V to 3V3 voltage regulator something around 100mA in a TO92 package should do.
Arduino out pins are connected with the input pins of another controller which works on 33v having active low configuration via internal pull up resistor.
Output 33 V pin. It is still a logical 1. When the switch is pulled low the 1000C output is off the LED is off the Pi is off and the display is off. 816 bit Xmega core 32 MHz. Here is the datasheet for the part. It uses the Atmega328p which can run both on 33V and 5V.