Goserial mac3/17/2023 ![]() It is recommended to use a series resistor to protect the input from stray voltages and spikes. In contrast to GPIOs, Analog inputs can read voltages at any level between 0 to 3.3V volts. ![]() A 470 Ohms series resistor is recommended for current limiting when connecting LED to a GPIO. So no additional circuitry is needed to drive regular LEDs. In output mode, GPIOs can source up to 25mA. It is recommended to use a series resistor with the GPIO/ADC pins when interfacing with other circuits. The ADC can acquire analog signal at the resolution of 12 bits per sample. ![]() All IO pins support 3.3V TTL signals and the ADC input range is 0 to +3.3V. Some of these pins can be used as Analog to Digital Converter inputs as well. The module has 128 General Purpose IO pins that can be used for various custom applications.
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