How to upload program from Arduino IDE to ESP-01s with ESP32

Using Arduino Microcontrollers
1

I want to use ESP-01S in my project to create Wifi Modem. So i just want to send program to esp-01s with esp32 if that's possible. I tried to simply connect VCC, GND, RX,TX, and GPIO to Ground to go in programming mode. So i tried to set esp32 just to be without any programms but it doesn't work. Of course i set COM, board, and baud, but this happend when i try to upload simply program to esp-01s.

Variables and constants in RAM (global, static), used 28124 / 80192 bytes (35%)
║ SEGMENT BYTES DESCRIPTION
╠══ DATA 1496 initialized variables
╠══ RODATA 948 constants
╚══ BSS 25680 zeroed variables
. Instruction RAM (IRAM_ATTR, ICACHE_RAM_ATTR), used 59747 / 65536 bytes (91%)
║ SEGMENT BYTES DESCRIPTION
╠══ ICACHE 32768 reserved space for flash instruction cache
╚══ IRAM 26979 code in IRAM
. Code in flash (default, ICACHE_FLASH_ATTR), used 236132 / 1048576 bytes (22%)
║ SEGMENT BYTES DESCRIPTION
╚══ IROM 236132 code in flash
esptool.py v3.0
Serial port COM3
Connecting......................................_____
A fatal esptool.py error occurred: Failed to connect to ESP8266: Timed out waiting for packet header.

I don't have any ch340, ftdi ft232rl or similary modul, only ESP32.
Any help?

2

Welcome to the forum

Please explain in detail how the Rx and Tx pins of both boards are connected. A schematic would be helpful

3

My recommendation would be to get one of those! CP2102 also good.

shopping (1)

4

Esp-01s Esp32
VCC 3,3V
GND GND
Tx Gpio3 (Rx)
Rx Gpio1(Tx)
GPio0 GND

I didn't use button between Gpio0 (esp-01s) and Ground. All i want is to set the es32 to be the bridge between pc and esp-01s.

5

Try connecting the ESP32 EN pin to ground. That will keep the ESP32 disabled while you do the upload

6

Good one.

I have another option.

Upload a modified version of the 'SerialPassThrough' example onto the ESP32.

void setup() {
  Serial.begin(115200); // baudrates to match ESP-01upload speed
  Serial2.begin(115200);
}

void loop() {
  if (Serial.available()) {      // If anything comes in Serial (USB),
    Serial2.write(Serial.read());   // read it and send it out Serial1 (pins 0 & 1)
  }

  if (Serial2.available()) {     // If anything comes in Serial1 (pins 0 & 1)
    Serial.write(Serial2.read());   // read it and send it out Serial (USB)
  }
}

Set the dtr on in the IDE to 'no dtr' preventing the ESP32 to go into the wrong boot mode.

connect the ESP-01 RX & TX pins crossed over to the Serial 2 pins on the ESP32 (RX to TX & TX to RX) and that should work

CH_PD / EN should always be connected to 3.3v / Vcc

@jim-p solution is obviously much simpler.

1 Like