ESP01 serial reception issue
Posted: Thu Jul 22, 2021 3:40 pmHello,
I have 2 esp01 512k that I wanted to take out of the drawers to use with RPi Pico for example.
I flashed them all with 2 versions of the "Firmware AT COmmand".
I used the esptool tool with these 2 firmwares: **v0.9.2.2** and **v0.9.5.2**.
The programming of the ESP01s goes without problem and at reboot, I have a message from the tested firmware:
or
for the second one.
My problem is that I can't send AT commands to the ESP01 at all, none of them react with a linux serial terminal like *picocom* or the Arduino serial console.
I thought that the problem came from the firmwares but by testing a simple Arduino sketch for this type of board in the IDE, I have the same problem.
In the console, I get the *now* variable displayed but no reaction when I send characters to it.
I use a personal card connected to a USB-serial card to program and test the esp01 like this without the DHT22:
What is strange is that the serial port of the 2 ESP01 works well in both directions when I flash it, I see the traffic on the LEDs of the USB-serial module. I don't understand why, it doesn't work anymore afterwards
Would you have an idea of the problem?
Thank you,
I have 2 esp01 512k that I wanted to take out of the drawers to use with RPi Pico for example.
I flashed them all with 2 versions of the "Firmware AT COmmand".
I used the esptool tool with these 2 firmwares: **v0.9.2.2** and **v0.9.5.2**.
The programming of the ESP01s goes without problem and at reboot, I have a message from the tested firmware:
Code: Select all
[System Ready, Vendor:www.ai-thinker.com]
or
Code: Select all
Ai-Thinker Technology Co. Ltd.
readyfor the second one.
My problem is that I can't send AT commands to the ESP01 at all, none of them react with a linux serial terminal like *picocom* or the Arduino serial console.
I thought that the problem came from the firmwares but by testing a simple Arduino sketch for this type of board in the IDE, I have the same problem.
Code: Select all
long lastMsg = 0;
long now;
int incomingByte = 0;
void setup() {
Serial.begin(9600);
}
void loop() {
now = millis();
if (now - lastMsg > 5000) {
lastMsg = now;
Serial.println(now);
}
if (Serial.available() > 0) {
Serial.print("I received: ");
incomingByte = Serial.read();
Serial.println(incomingByte, DEC);
}
}In the console, I get the *now* variable displayed but no reaction when I send characters to it.
I use a personal card connected to a USB-serial card to program and test the esp01 like this without the DHT22:
What is strange is that the serial port of the 2 ESP01 works well in both directions when I flash it, I see the traffic on the LEDs of the USB-serial module. I don't understand why, it doesn't work anymore afterwards
Would you have an idea of the problem?
Thank you,