Let me show you another cool thing with using the HC-12 module.
In this case it will be a wireless thermometer with using only a HC-12 module as a sensor and as a transmitter simultaneously.
With a new custom firmware it will transmit a data from a temperature sensor which is embedded in the Si4463 chip. This solution does not require any additional hardware but a HC-12 module.
The transmitted data can have been received with another HC-12 module that have a default firmware and must has been set to default channel. It can has been done with the AT command 'AT+DEFAULT' when the SET pin is connected to the ground pin.
A measuring step is 0.2 celsius degrees.
The received data looks like "+12.3~C" or "-12.3~C" in a window of a Terminal programm.
How it looks like can be seen on YouTube: