4.3 Inch ESP32 HMI Display 480x272 LCD Resistive Touchscreen Duplication of Pin Outputs
in ESP32 & Lora
This screen has only two digital output pins 37,38 and UART output pins 17,18 available for communication. How do I connect the HMC5883L 3-axis compass sensor GY-271, MAX6675K thermocouple sensor to the screen?
Comments
The GY-271 can be used with pin37 and 38. However, the MAX6675 K-Type cannot be used because of limited pin resources. But if you can connect the CD74HC4067 module, you can plug the CD74HC4067 module into the breadboard. Then use DuPont wire to connect the control pin of the CD74HC4067 chip to the unused pin on the ESP32 chip. If your project does not require the use of speakers, you can occupy the speaker's IO18, IO42, and IO17 pins, plus GPIOD's IO38 pins, which is enough for four control pins.