How to use an Arduino as a USB to TTL converter || Arduino tutorial

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Video, edit, voice by Chris Lorkowski

Music by Jason Shaw - Keep It Real

[debdinoogmai]

Fantastic. I just bricked my tp-link router and this is exactly what I need to fix it today instead of waiting for a usb to ttl converter.

[Ahmadnaweed]

What about logic level ? Because the router is 3.3 v and atmega328p is 5 v?

[dnsshetty]

When using a normal USB to TTL device, we connect RX of the device to the TX of router, and TX of device to RX of router. However, in this video you have connected RX to RX and TX to TX.. am not too sure, but is this a correct configuration?

[davebutler]

This worked like a champ for Tasmotizing a few Sonoff Basics after also connecting 3.3V on the Arduino to 3.3V on the Sonoff.

[liquidpower]

this helped so much i was trying to use a real usb to ttl the ftdi232 and every time it gave me an error watched this threw my arduino on it and bam i can upload the firmware now thanks!

[renzevenir]

Truly a life saver! Thanks! I have to customize my STOSD and I have no USB to TTL converter.

[memogarcia]

Hi, in this case I have the arduino 2560, what is the sketch for make it work? thanks

[stephencrown]

Can i connect esp8266 to a PC in this method ?

[barebooger]

This worked with my older Arduino Duemilanove, thanks! I was having trouble programming the PID on a Tarocco servo controller with a 3.3v USB to serial cable. This did the trick. I think it needed the full 5V.

[chriskaprys]

I'm so glad this is here. I was about to purchase a USB to TTY serial converter, but then wondered if I couldn't just use one of my arduinos to do the same. Arduino to the rescue!
I'm wondering how I actually interface with the device once it is connected, though. If I open the serial monitor I will only have a passive view of what's happening on the device, right? How would I send commands over a terminal once the device is connected?
Thanks!
*edit* Ignore me. I just realised the text field with 'Send' is at the top of the serial monitor. So blind sometimes 😎

[sweetclara]

Please do me a favor?Can I use Arduino instead of Serial port to USB gender?Now I want to use 4, 6 pin ( DSR/DTR) of serial ports cable with my device,  but I don't have Serial port cable.So, I connect with my device (there are two cable to connect 4, 6 pin actually) to Arduino.I am not sure it is working or not...

[pascalbeucher]

Hi, then you connect a USB cable between the computer and the Arduino?
USB PC ---> USB Arduino _ TX/RX Arduino ---> Device serial port ?

[ВадимГусев-со]

Hello tell me you need to use the library for this example?

[doniherald]

someone say i need to connect CH_PD or EN pin to GND, but i can't find it in my Wemos D1 R1 board.
turn out Reset pin to GND also works, Thanks!

[eaingraham]

I'm trying this with an Arduino Leonardo, and when I make the connection between RESET and Ground (similar to whats shown in the video), the connection between my computer and the arduino gets reset (sounds reasonable when you think about it) ... How do I get my computer to speak to/through the arduino once the atmega gets put to sleep?

[serial]

Hi I am trying to use this to program my UV-5R radio, Usually it requires cable which has USB to TTL adapter, I made the cable and trying to use arduino as USB-TTL adapter, But it does not seem to connect... Tx-Rx line flashes once then it Chirp software gives error that it cannot detect the radio.

Software: CHIRP

Reference:

Why with this method can`t flash SIM900A ?

but without a usb to ttl converter does it work?

I still don't understand.

[xephael]

What's your voltage reading on ground to RX or TX?

[saikatd]

How to program the external atmega ic using this technique?

[bxeagle]

Does this method works for stm8 board?