Using an esp32 Cheap Yellow Display (CYD) and si4732 to make a HF/VHF radio receiver.
I am using a 2 x USB variant of the CYD and a v5 K5/K6 si4732 flex PCB as used in modifying a Quansheng K5 for full HF/VHF.
By using the software from 'macsbug' you can have a functional radio receiver for not a lot of money.
Code is here...
https://macsbug.wordpress.com/2026/01/
Download the code for the 2 USB version (right click and save as)
I have modified my CYD by removing the onboard LED and cutting some track on the two connectors, P3 and CN1.
I cut the trace(s) from P3, just under the green wire - IO35 and also from IO22 to CN1.
I also cut the track IO22 track near CN1.
Doing this allowed me to wire IO16 and IO7 from the old LED to the P3 and CN1 connectors.
I adjusted macsbug code to match the new wiring.
I used much as macsbug has posted on Facebook...
Click images to go SUPERSIZE and then click the X at top right to close the large image.
I am going to call my type "CYD2USB-v2" as it seems different to the earlier versions shown on the internet?
In macsbug code, I have adjusted it to suit my wiring, in particular, IO21 is used by the board for the LCD backlight, so cannot be used in this scenario.
CYD2USB_2.8_All_Band_Radio.ino file, around line 85
https://macsbug.wordpress.com/2026/01/
I am not the only one with this issue.
I'm hopeful we can find a solution to this as my CYD touch does work OK using a completely different use case/software.
I used a v5 K5/K6 si4732 flex PCB as used to modify a Quansheng handy-talkie to HF Rx and hacked it onto a bit of circuit board using enamelled copper wire and some headers
More to follow as it happens...
