I recently undertook a project to retrofit my garage door controller with a Tasmotized Sonoff dual-channel WiFi switch, and it’s been a fascinating journey! 
I wanted to share my experience and some insights in case anyone else is looking to do something similar or facing similar challenges.
The setup involves using Node-RED to manage the automation, which has proven to be incredibly flexible. I’ve integrated time limits for opening and closing the garage door, and I’m currently using Zigbee contact sensors as a fail-safe measure. While the system works well, I had an interesting challenge to solve: ensuring that both the ‘raise’ and ‘lower’ switches couldn’t be activated simultaneously. Initially, I was worried this might require complex scripting, but it turned out to be much simpler than anticipated!
After some research and experimentation, I realized that setting up an automation in Node-RED where one switch deactivates the other upon activation was the way to go. This prevents any potential conflicts and ensures smooth operation. I’ve included a snippet of my Node-RED flow below for anyone curious about the implementation:
{
“id”: “536fd775.58fe48”,
“type”: “server-state-changed”,
“z”: “bfd7aef0.eb01f”,
“name”: “”,
“server”: “3d69c792.a40838”,
“version”: 1,
“exposeToHomeAssistant”: false,
“haConfig”: [
{
“property”: “name”,
“value”: “”
},
{
“property”: “icon”,
“value”: “”
}
],
“entityidfilter”: “switch.garage_door2_2”,
“entityidfiltertype”: “exact”,
“outputinitially”: false,
“state_type”: “str”,
“haltifstate”: “on”,
“halt_if_type”: “str”,
“halt_if_compare”: “is”,
“outputs”: 2,
“output_only_on_state_change”: true,
“for”: “26”,
“forType”: “num”,
“forUnits”: “seconds”,
“ignorePrevStateNull”: false,
“ignorePrevStateUnknown”: false,
“ignorePrevStateUnavailable”: false,
“ignoreCurrentStateUnknown”: false,
“ignoreCurrentStateUnavailable”: false,
“x”: 170,
“y”: 1660,
“wires”: [
[
“7bda149b.d98cdc”
],
]
}
This setup ensures that if one switch is active, the other is automatically disabled, preventing any accidental or conflicting operations. It’s a small but crucial detail that makes the system more reliable.
I’m now looking into enhancing this further by incorporating more advanced automation, such as motion sensor integration or even voice control through my smart speaker. If anyone has tips or experiences to share on similar projects, I’d love to hear them! 
Happy automating! 