Notification device III

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Posted by w0ep on July 7, 2018 at 5:58 pm

[Thursday : 3.5 miles; today: 6.6 miles]

I worked some more on the notification device.  I had an aluminum box; I had to make a cover for it and put some holes in it for the power supply and network port.  Today I got everything installed, tested, then took it out to the radio transmitter shed.

For the moment it has two temperature sensors and a serial port connection to the transmitter.  I need to do the email configuration yet again (the third time I think).  Then I can write up some scripts to watch for error conditions and send myself an alert email.

I still need to figure out how to determine dead air.  I have an FM receiver chip.  I should be able to tune in and demodulate the signal.  I will have a signal strength indication and the audio output.  Single strength probably won’t do any good because a quite FM signal is as “strong” as a noisy one.  So I’m thinking I may need to run the audio output into an ADC and look for activity on the audio.  I’ll work that out here in the office then install the modifications once I know what I need to do.

I’m really happy with my progress on this.  I have been thinking about it for a long time.


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