KIT ST4732 from China (Firmware Update)

See how to update the firmware on: https://github.com/pu2clr/SI4735/tree...
About PU2CLR SI4735 Arduino Library: https://pu2clr.github.io/SI4735/
Be a member of Facebook group Si47XX for Radio Experimenters (  / 532613604253401  )

New features

The final code (HEX file) is about 2.5K smaller than the previous one (now you have more memory to add new features);
Twenty three bands. Two VHF(FM); one LW; two MW; and Nineteen SW bands covering from 1800 to 30000 kHz;
Band, Volume, Step, Bandwidth, AGC/Attenuation are now controlled by encoder;
_"Vol-"_ buttons is free to implement new features. It has no function for while;
_"BAND-"_ now is used to control Softmute Attenuation;
All the previous status of the receiver can be rescued when you turn it on (including SSB mode, bandwidth, volume, frequency, BFO etc);
The bandwidth now is a property of the band (you can use different bandwidth for different bands);
Bandwidth control on FM mode (Auto, 110, 84, 60 and 40 kHz);
Bandwidth control on AM mode (1, 2, 2.5, 3, 4 and 6 kHz);
Bandwidth control on SSB mode (0.5, 1, 1.2, 2.2, 3 and 4 kHz);
AGC (Automatic Gain Control) and Attenuation control;
Softmute Attenuation Control;
FM/RDS presentation was improved;
The seek function was improved (it is more precise on FM mode). The seek direction is controlled by the encoder (clockwise or counter-clockwise. Press encoder push button for seeking
Steps: 1, 5, 9, 10, 50 and 100 kHz;
Now you can configure MW band space to 9 or 10 kHz;
New FM band from 64 to 84 MHz;
New MW band from 531 to 1701 kHz for Europe, Africa and Asia;
The frequency on Display is bigger than the previous version;
Now the bandwidth sequence is ordered by bandwidth values;
After about 4 seconds, all command buttons are all disabled and the encoder control goes back to the frequency;
The current status of the receiver will be stored only after 10 seconds of inactivity.

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