💻 HiLetgo 5pcs USB to Serial USB to TTL CH340 Module: STC Microcontroller Download Adapter Bundle Review

I tried these because they were cheaper than the commonly mentioned FTDI converters. On the Internet, users have reported connection problems with the ESP32-CAM. I was concerned that using them would complicate things. Initially they would not load properly at the default 921600 baud (using the Arduino IDE). However, they worked fine when I reduced the speed to 115200 baud. This might work at a medium speed like 460800 but I haven't tried it. I can't fault these converters as people have had…

They are nicely packaged in an insulating, see-through case and work great with a 3.3V TTL CPU (STM32F103RC). I didn't see any jumpers to select 3.3V or 5V because the board is so compact I doubt there will be room for it! I especially like the RED LED which doesn't blind your eyes when you plug in the module! Some other brands use blue LEDs which I feel are tailor made to fully illuminate a typical computer room :) But this one is discreet. I'm a lucky tourist!

The adapter works great in the cycle test so I really hoped it would do its job. I'm trying to upload a sketch to my standalone ATmega328P PU chip. However, since there is no DTR pin to the output, I had trouble connecting this device. I know the CH340 has a DTR pin and have seen pictures of people soldering a small wire from the DTR pin to the output, it seems a bit beyond my skillset. However, I have successfully connected it to the ESP8266-01 and it works great. I would like to see how to…

I tested these because they were cheaper than the commonly mentioned FTDI converters. On the Internet, users have reported connection problems with the ESP32-CAM. I was concerned that using them would complicate things. Initially they would not load properly at the default 921600 baud (using the Arduino IDE). However, they worked fine when I reduced the speed to 115200 baud. This might work at a medium speed like 460800 but I haven't tried it. I can't fault these converters as people have had…

These are by far my favorite USB/TTL devices. First, there is a jumper that allows you to choose between +3.3 or +5V. Another interesting feature is that they use the CH340 chip. I found it significantly more reliable on Windows than another widely used chip, the SiLabs CP201x. The problem with CP201x chips is related to Windows - so often after applying Windows updates, drivers are replaced with default values, which causes them to stop working until the appropriate drivers are manually…