Difference: HardwareAccessGPIO (2 vs. 3)

Revision 32022-10-16 - UliRaich

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META TOPICPARENT	name="MinimalLectures"

Hardware access, the General Purpose Input Output (GPIO) pins.

Running the programs on the PC

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In order to understand how to access GPIO line we must look up the MicroPython documentation. Select Quick reference for the ESP32 and search for Pins and GPIO

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As you can see, MicroPython supplies a Python module named Pin, which is used to program GPIO pins. In order to control a LED the corresponding pin must be programmed to be an output line.

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The schematic diagram of the LED connection looks like this:

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When the output level on GPIO 2 is zero, then there is no voltage across the LED and the resistor. The LED is switched off. If GPIO 2 is at high level, then there is a voltage of 3.3V across the LED and the resistor and the LED lights up. The 330 Ω resistor limits the current flowing through the LED to 10 mA.

As you can see, MicroPython supplies a Python module named Pin, which is used to program GPIO pins. In order to control a LED the corresponding pin must be programmed to be an output line.

from machine import Pin
from time import sleep
led = Pin(2,Pin.OUT) # the led is connected to GPIO 2 and this is an output line

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META FILEATTACHMENT	attachment="esp32_back.png" attr="" comment="" date="1665914587" name="esp32_back.png" path="esp32_back.png" size="169353" user="UliRaich" version="1"

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META FILEATTACHMENT	attachment="led.png" attr="" comment="" date="1665938650" name="led.png" path="led.png" size="5815" user="UliRaich" version="1"
META FILEATTACHMENT	attachment="switch.png" attr="" comment="" date="1665938650" name="switch.png" path="switch.png" size="5608" user="UliRaich" version="1"

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