I drive a lot and wanted to toggle my Sonoff relays from the car screen without reaching for my phone — so I built a small app for it. Sharing it here in case others find it useful.
Adds a dashboard of tappable buttons on CarPlay / Android Auto.
Logs in with your normal eWeLink account — no developer keys needed.
Lists the devices in your account and supports multi-channel relays (deviceid#0, #1, …) the same way the eWeLink app exposes them. Geofence automations: trigger actions (or Home Assistant scenes) automatically when you enter or leave a zone — e.g. open the gate relay as you pull into the driveway. Notifications show up on CarPlay too.
Honest note: it’s a paid app — $9.99 one-time, no subscription. I’d rather be upfront about that than bury it. It also supports Home Assistant, MQTT, Tuya and Shelly in the same app, but eWeLink is the part that’s been tested most.
Would love feedback and feature requests from people who actually use Sonoff gear daily. Two questions to the community:
Would a geofence trigger (drive-up automation) be useful in your setup, or do you prefer manual buttons?
Happy to answer any technical questions.
It depends what you need. That app only controls eWeLink/Sonoff devices.
CarHA connects to Home Assistant, Sonoff, Shelly, Zigbee, Z-Wave, MQTT, Tuya, which means any brand and any protocol, and anything else HA supports.
You can have mixed dashboards where one tab shows a Sonoff switch, a Shelly relay, and a Zigbee sensor side by side. It also has geofencing, so actions trigger automatically when you leave or arrive home without any tap needed. And it’s built specifically for CarPlay’s native grid and list templates, not a generic remote control bolted onto CarPlay.
If you’re already in the Home Assistant ecosystem, it’s a completely different scope.
Did you create (program) it yourself, or did AI do it for you?
I designed and built it — AI helped with some of the repetitive parts, same way any developer today uses Copilot or similar tools. Architecture, UX, and all the HA integration logic are mine.
Yes, that’s possible! To add you as a tester for the Android version, I’ll need the email address associated with your Google account. Google will send you an invitation.
Sure, I’d love to! My Android Auto screen a diamond brand with only part of the screen usable, but I hope your app will still be helpful even with that limitation.
