Add submission # 6230

#6230

Author: ArduinoBot

registry.txt

@@ -8079,3 +8079,4 @@ https://github.com/TheKvc/ServoHack.git|Contributed|ServoHack
 https://github.com/microbotsio/CodeCell-MicroLink.git|Contributed|CodeCell MicroLink
 https://github.com/miniiot/miniiot-arduino.git|Contributed|MiniIot
 https://github.com/fanfanlatulipe26/ESP32_ppm.git|Contributed|ESP32_ppm
+https://github.com/DFRobot/DFRobot_C4001.git|Contributed|DFRobot_C4001