GPIO0 is used to determine the boot mode on. ¶ Note that in certain conditions you can use the pins marked as INTERNAL in the above image. Only one GPIO pad can connect with input signal.The ESP32 boards often use the internal GPIO pin numbering on the board, this means that you don't have to worry about other kinds of pin numberings, yay! Pins on the NodeMCU ESP32 development board. Internal signal can be output to multiple GPIO pads. TX0 and RX0 -> Serial), the same code works fine.Using this function we can select any pin as a TX, RX, CTS and RTS. Instead, if i connect the LoRa RX and TX to pin 41 and 40 (which is the U0UXD. While i am using the next code, nothing is sent to pin 17.

I checked the pinout of the ESP32 board and saw that Serial2 corresponds to 17 and 16 pins, in which i connected the LoRa RX and TX, accordingly. Exists more expensive FT232RL or FT232 module, but a CH340G or CH340 working very good. To connect, naturally, you must use a USB to TTL converter, you can find it at 1$. This pins can be used at to transmit core debug information or like a classic serial named Serial2. Komunikasi serial merupakan salah satu komunikasi data yang sinkron, meskipun esp32 sudah memiliki cukup banyak pin gpio yang bisa bekerja sendiri tanpa menggunakan arduino sekalipun, namun tujuan dari artikel ini hanya untuk belajar, barang kali suatu saat mengharuskan komunikasi data antar esp32 dan arduino uno dengan serial, maka tutorial ini bisa bermanfaat. In order to program this device you'll need to make use of an FTDI adapter. Another thing missing from the ESP32-CAM module is a USB port. Many of the GPIO pins are used internally for the camera and the microSD card port. TX & RX of PMS5003 is connected to RX2 & TX2 of ESP32.The ESP32-CAM module has fewer I/O pins than the previous ESP-32 module we looked at. Similarly, the PMS5003 sensor is connected to the UART2 pin of ESP32, i.e. The relay is switched ON via BC547 NPN Transistor which is connected to GPIO23 of ESP32. The OLED Display is an I2C module, hence it is connected to ESP32 I2C pins, i.e SDA & SCL pins are connected to ESP32 GPIO21 & GPIO22 respectively.

Arduino using wire library