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Wireless Thermometer with using only a HC-12

simple solution which doesn't require any additional hardware

vladlenvladlen
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I am continuing my theme of using the HC-12 module in a non standard manner.
I wanted to make something with using only a HC-12 module.
And I did it... as I could :)

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:  

USING_A_HC-12_AS_A_WIRELESS_THERMOMETER.hex

hex - 11.19 kB - 01/28/2018 at 19:18

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  • Be careful

    vladlen • 11/29/2018 at 10:30 • 0 comments

    Note that you frequently might meet a trouble with tuning it because the crystals on different samples are different from each other if they were bought from the different sellers!

    It was discussed earlier. link

View project log

  • 1
    Step 1

    Just load new firmware to one HC-12 module and receive the temperature with using another module which have a default firmware.

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ke6zfi wrote 12/14/2018 at 06:17 • point

Great project, any chance of sharing the source code for others to build upon?

  Are you sure? yes | no

karczewski.szymon wrote 02/21/2018 at 12:32 • point

Hi, I've just bought HC-12 modules and I'm looking forward to try your firmware, but I also wonder if you have written everything from scratch or used some *base* code available somewhere? I want to keep this module as low power as possible by transmitting data only above certain temperature and in greater time intervals.

  Are you sure? yes | no

vladlen wrote 03/01/2018 at 11:28 • point

I have used the SPL from ST. Also I have used fragments of someone else's code that I found on the Internet to write a little and simple library that drives the Si4463.
For myself I wrote another firmware that transmits a paket only one time in about 1.5 minute. With this FW the HC-12 module consumps about 0.1mA between transmitions.

I can try to help if you need .

  Are you sure? yes | no

brian wrote 02/01/2018 at 02:22 • point

This sounds great. I'll give it a try. Thx!!

  Are you sure? yes | no

vladlen wrote 02/01/2018 at 05:40 • point

Thank you too!  

Awaiting your comments about its working.

  Are you sure? yes | no

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