Or roll your own:
It's overkill, but lots of solar-powered battery-backed raspberry pi systems out there. If it only needs to run for a few minutes/day. You can undersize the solar if you can skip cloudy days when there's not much growth anyway.
Maybe an old laptop with webcam or some digital cameras with 'remote' triggers could fill the role.
An RTC chip with alarm function could send a power-on signal every day and at least a pi can self-shutoff once the job is complete.
"Not all RTC chips have alarm functions but a few that do are the DS3231 (Maxim Integrated), MCP79410 (Microchip) and ISL12026 (Intersil). Here, a DS3231M is used to construct a simple, but fully functional, RTC building block and, further, to construct an example RTC-based switch."
Or roll your own: It's overkill, but lots of solar-powered battery-backed raspberry pi systems out there. If it only needs to run for a few minutes/day. You can undersize the solar if you can skip cloudy days when there's not much growth anyway.
Maybe an old laptop with webcam or some digital cameras with 'remote' triggers could fill the role.
An RTC chip with alarm function could send a power-on signal every day and at least a pi can self-shutoff once the job is complete.
"Not all RTC chips have alarm functions but a few that do are the DS3231 (Maxim Integrated), MCP79410 (Microchip) and ISL12026 (Intersil). Here, a DS3231M is used to construct a simple, but fully functional, RTC building block and, further, to construct an example RTC-based switch."
https://www.allaboutcircuits.com/projects/build-programmable...