Flashing bricked many early units because users didn't read the pinouts. Follow this carefully.
Most ATS20 boards use the cheap CH340 USB-to-Serial chip. Download and install the latest CH340 driver so your PC recognizes the radio.
Select Arduino Uno or Arduino Nano (Check your specific ATS20 board layout; most standard budget enclosures use the ATmega328P Nano or Uno bootloader). ats20 firmware
Simple, yes. But the difference on air? Suddenly, you can actually zero-beat a CW station.
Short-press BAND+ to enter band selection, then use the encoder to switch bands. Flashing bricked many early units because users didn't
1. "Failed to upload" / "Avrdude: stk500_getsync() attempt 1 of 10"
If turning the knob clockwise moves the frequency down instead of up, you need to invert the encoder pins in the software. Look for the encoder pin definitions (typically labeled ENCODER_PIN_A and ENCODER_PIN_B ) and swap their assigned numbers. 4. Severe Distortion on SSB Download and install the latest CH340 driver so
While the ATS_EX firmware is the standard, the community has developed other specialized firmware forks:
Download your chosen ATS20 .ino firmware file from a trusted community repository (such as GitHub). Open the file in the Arduino IDE.
The (often based on the open-source work of Ricardo Caratti and later modified by others) bridges this gap by utilizing the full processing power of the onboard Arduino/Atmega328p chip. Key Features of Enhanced ATS20 Firmware