Basically I just need a temp sensor and either a presence sensor or motion that works with Snartthings and doesn’t cost the earth.
What’s been successful for you?
Same here, the Tapo T315 bridged with the H100 hub (I try to avoid Matter bridges but it’s cheap and small). It updates via Matter (almost) every time it changes 0.1°C. And the motion sensor too, works great and it’s so compact.
And the Tapo contact sensors are tiny compared to other brands.
Another benefit: they are “subG”, 868 MHz, if I remember correctly. Rock solid connection even through thick walls. Battery lasts 1.5 years in my experience.
For your temperature sensor try using the “ZigBee Temp Sensor and Child Thermostat Mc” driver it works well with my Tuya temperature and humidity sensors.
FYI: the cheap Tuya ZigBee temperature and humidity sensors work well with this driver on ST and are cheap. Do NOT get the Tuya sensors with LCD displays.
Ive literally just sent one of these back as I couldn’t get it to work correctly in ST. I can find the thread about the driver but can’t actually find the driver!
I’m using Sonoff 02P and 02D for temperature and humidity. They have dynamic update rate - quick changes report quickly, while in steady conditions battery is being saved.
This is what put me off the Aqara temp/hum sensor - it reports once an hour no matter what, which made it useless for automations.
Both of these were run directly on the ST hub, not through vendor’s hubs. Results may vary if you did that.