I recently got a Dust sensor from a company and it says that the voltage out corresponds to the concentration of dust in the air. How can I use the GPIO pins to get the voltage reading?
The voltage is lower than 4 volts as well.
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I found several tutorials online for connecting analog inputs to a Raspberry Pi. I'd recommend the Adafruit site. I noticed that one of the chips they used was about the same price as an small Arduino, which has 5 analog inputs. There are many online tutorials to show you how to communicate between and Arduino and Raspberry Pi.
Use an ADC (analogue-digital converter) like the MCP3008. Easy to get readings with Python:
from gpiozero import MCP3008 dust = MCP3008() while True: print(dust.voltage)