How to Build a Sunrise Alarm Light in Home Assistant

I wanted a sunrise alarm: the light slowly ramps up before I need to be awake. I also wanted to control it from a Home Assistant dashboard without opening any menus. One tap to arm it, and a time picker that only shows up when it's armed. Here's how I built it, starting with the dashboard and then the automation that does the work. It's another smart-light automation to add alongside my post on controlling Govee Scenes in Home Assistant. Here's how it looks on a dashboard, armed for 05:55: What you need Two helpers: an input_boolean called alarm_toggle and an input_datetime called alarm_time (time only, no date). Create these under Settings → Devices & Services → Helpers → Create Helper, picking "Toggle" and "Date and/or time" respectively. A dimmable light that supports transitions, which is the light that does the sunrise. I'm using a Hue Play Bar Mushroom cards, for the toggle card time-picker-card, for the time picker The automation itself, which is the part that does the work and…