# Connecting WebControl to Arduino

**URL:** <https://forums.maslowcnc.com/t/connecting-webcontrol-to-arduino/26272>\
**Category:** Troubleshooting\
**Created:** [October 12, 2026, 2:58pm UTC](https://forums.maslowcnc.com/t/connecting-webcontrol-to-arduino/26272 "2026-10-12T14:58:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![eriktheelder](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/eriktheelder/32/32024_2.png) [@eriktheelder](https://forums.maslowcnc.com/u/eriktheelder)\
**Post date:** [October 12, 2026, 2:58pm UTC](https://forums.maslowcnc.com/t/connecting-webcontrol-to-arduino/26272/1 "2026-10-12T14:58:36Z")

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I’m using a Metal Maslow and have driven it with a MacBookAir 7,2 using a Ubuntu 24.04.5 LTS and WebControl v0.94. I am now trying to operate the Maslow with a Lenovo ThinkPad P50 also running the same Ubuntu OS. I attach the USB from the Maslow to the ThinkPad, launch WebControl (also v0.94) and under maslow settings I refresh the list of serial ports and choose /dev/ttyACM0 and use the submit option but the display still shows not connected. Specifically “Connected to 127.0.1.1:5000 CPU 19% Not Connected” with Not Connected in Pink. In Terminal I can see the Arduino SA mega 2560 R3 (CDC ACM) Bus 001 Device 016: ID 2341:0042. Since the list of serial connections populated it seems there is a connection between the WebControl and the Maslow. So how do I connect?