Another noteworthy feature is the RX-TX switch function. Traditional Arduino boards assign digital pins in a specific order, but the UART interface on the RP2350 has a different configuration.

PPM_Receiver is a project that receives wireless data via NRF24L01 and outputs it as PPM signals, compatible with both Arduino and ESP32 platforms.

CH570 also comes with 12KB SRAM and 256KB flash (vs 2KB SRAM and 16KB flash for the CH32V003), offers up to twelve GPIO, six PWM, I2C, UART, SPI, and a 20-channel key detection module. There’s also ...