Ats20 Firmware
Most custom ATS20 firmware is built upon the robust SI4735/SI4732 Arduino Library developed by Ricardo Caratti (PU2CLR). While it is a library rather than a standalone firmware sketch, developers use it to create feature-rich interfaces specifically compiled for the ATS20 button layout and OLED display. 2. The "Harduino" / PE1NNZ Modifications
Most "out of the box" ATS20 units come with basic, sometimes buggy, factory firmware. Updating to community-driven versions offers several transformative benefits:
The firmware was compiled for a different display driver or I2C address (e.g., 0x3C vs 0x3D ).
For the first time, you have granular control over how the radio sounds, including a built-in adjustable AGC (Automatic Gain Control) and Noise Blanker . You can also adjust the De-Emphasis for FM stations, optimizing the sound quality for your region. ats20 firmware
Most ATS20 boards use the cheap CH340 USB-to-Serial chip. Download and install the latest CH340 driver so your PC recognizes the radio.
Custom code eliminates jagged, scaled UI assets, replacing them with sharp 7-segment digital styles, adjusted brightness controls, and functional S-meter visual bars.
At its heart, the ATS-20 is a marvel of modern design. It's a portable software-defined radio (SDR) that, at the time of writing, can be found online for around $30. Unlike many "black box" consumer radios, the ATS-20 is built on an accessible Arduino platform (typically an ATmega328P on an Arduino Nano board) and is powered by a powerful Silicon Labs Si473x DSP receiver chip. This open hardware architecture is what makes the world of custom ATS-20 firmware possible. Most custom ATS20 firmware is built upon the
This is the "holy grail" for many users. Advanced firmware allows you to listen to amateur radio (HAM) operators, utility stations, and maritime communications by enabling LSB (Lower Side Band) and USB (Upper Side Band) modes.
Short-press VOL- to mute/unmute the receiver. Troubleshooting
Switch the baud rate between 57600 and 115200 . Try a different USB cable and verify the port in Device Manager. 2. Display is Blank After Flashing The "Harduino" / PE1NNZ Modifications Most "out of
Because the ATS20 uses an Arduino-compatible microcontroller architecture, flashing new firmware is straightforward. Prerequisites
Install the CH340 driver if your computer does not automatically recognize the radio when plugged in. Step 2: Download the Firmware File
Some custom builds even add using just the existing LCD and clever timing tricks.
Most ATS20 units use the CH340 USB-to-Serial chip. Ensure the CH340 driver is installed on your PC so the device is recognized as a COM port. Method A: Flashing via Arduino IDE (From Source Code)