A device/thermometer with the ability to energize when a certain temperature is reached?

Question

Iron

There is an Openwrt router that gets quite hot, lm-sensors: 55-65 C it has a usb port and I connected a USB fan to it.

After numerous attempts, + the manufacturer of the router confirmed that it is impossible to turn on / off the power of the usb port on their hardware: /

Accordingly, I am looking for an alternative how to turn on the cooler / fan when a certain temperature is reached.

I suppose you need an external thermometer that would provide appropriate power or, for example, a bunch of smart sockets + xiaomi thermometer

How to make it as simple as possible?

Answer 1

bleh .... wasn't it easier to buy Mikrotik?)

Answer 2

for example, a bunch of smart sockets + xiaomi thermometer

Or a stupid old thermostat.

Answer 3

Monsieurs just know a lot about special perversions, since they use this product called WRT.

Answer 4

Thermistor

Answer 5

arduina + thermal sensor + transistor (in the role of a power key)
if with ali- within 200 ru