I have a driveway sensor which up until recently was working well. In summer, it used to trigger with the sun low on the horizon, so in hindsight, it would have been better to install it in the other direction, although cabling didn't really permit that.

Due, I think, to UV degradation of the plastic cover over the receivers, it is now triggering a lot more frequently. Applying a small amount of baby oil seems to stop it, suggesting my theory is correct.

In order to avoid pointing directly into the afternoon sun, I am hoping to install a 433MHz 'sensor' that can take a generic high/low or open/close input and transmit state changes. I've not been able to find such a thing, but I'm sure it exists on AliExpress amongst all the universal receivers and remote controls. This would need to transmit a protocol that can be decoded using rtl_433, which already integrates with the security system (to provide light levels for outdoor sensor light logic).

I had considered repurposing an old remote and wiring the relay up to a button, but because the sensor outputs continuously if the beam is broken, I'd exceed the maximum permitted duty cycle on 433MHz.

Any pointers would be appreciated.