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labs/006_i2c_lcd_1602/schematic.md

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+# Schematic
+
+## Expected Circuit
+
+```text
+ESP32 GND  -> LCD GND
+ESP32 3.3V or 5V -> LCD VCC, only after checking module requirements
+ESP32 SDA GPIO -> LCD SDA
+ESP32 SCL GPIO -> LCD SCL
+```
+
+## Important Check
+
+Before connecting SDA/SCL to ESP32, verify I2C pull-up voltage. ESP32 GPIO must not receive 5V.
+
+## Actual Circuit
+
+TODO: указать VCC, SDA GPIO, SCL GPIO и I2C address.