Full Duplex TTL to Half Duplex TTL Converter 질문

[roboteer]

Hello @gr3658 ,

Does your custom controller have a USB Port available to control Dynamixels? If it does, you can use the U2D2, as the easiest solution:

Introduction

The ROBOTIS e-manual website does provide the circuitry for converting Full to Half Duplex here:

ROBOTIS e-Manual

And I have tried to recreate this circuitry myself, but my soldering skill does not extend to Surface Mounted (SMT) devices (such as the 74LVC2G241) which are too small for me to handle. You can read my post below for a DIP solution.

"Homemade" DXL Shield

Like many folks, I was also interested in creating my own DXL Shield and I found this TTL Communication schematic on ROBOTIS e-Manual It uses the 74LVC2G241 which is a surface-mount device which has 0.38 mm wide leads set 0.65 mm apart from each other. Unfortunately, a home user like me does not have the soldering tools and skill levels to handle such a small device (3.1 x 3.1 mm overall size). Thus, I needed a different solution using Dual-Inline type of devices with similar functionalitie…

If your controller is ARDUINO compatible, you also should be able to use the DXL MKR Shield with your custom controller if it has 3.3 V UART Port, please these two posts regarding the use of ESP32 and ESP32 S3 with the DXL MKR Shield:

ESP32 S3 + DXL MKR Shield Mash-Up in ARDUINO

UPDATE: 3/9/2023 Just got in today an Adafruit Feather S3 4 MB Flash 2 MB PSRAM. It also got the same issues with needing to use the BOOT & RESET buttons to get into LOAD mode and into RUN mode as the UM board. I am beginning to think that THIS IS a FEATURE of the S3 Don’t know when Espressif and/or Arduino are going to fix this issue as according to this Github post, this issue had been discussed since May 2022. The ESP32 C3 seemed to have similar issues but su…

ESP32 + DXL Shield MKR Mashup in ARDUINO

Update 2/24/2023 I got some PCB and made my 100% wire-wrap “carrier” board for the ESP32 and DXL MKR shield - all the wire-wrappings are hidden beneath the PCB: [IMG_020624] And interestingly, no more “128” Packet Error Message >> must have been due to some mechanical connection issues with my first wire-wrap solution. [NoMoreError128] So we found that although the D2A Library had never been written for Dual Core Programming, but thanks to the good job of the FreeRTOS folks in writing the…