The Raspberry Pi Pico is a popular 3.3V microcontroller. Here is a concrete example of how to connect a YP-05 to it for serial communication:
Typically Mini USB (though some variants use USB Type-C ). Yp-05 Schematic
Since the ESP32-CAM lacks a built-in USB port, the YP-05 is frequently used to flash firmware. This requires connecting U0R (RX) to TX , U0T (TX) to RX , and bridging GPIO0 to GND to enter flashing mode. The Raspberry Pi Pico is a popular 3
Sometimes, manufacturers of YP-05 clones will slightly rearrange the pinout, so it's always a good idea to check with a multimeter to confirm VCC and GND. This requires connecting U0R (RX) to TX ,
While the amplifier section often runs directly off the 5V input, the core Bluetooth SoC requires 3.3V. The schematic features a low-dropout (LDO) linear regulator (such as the XC6206 or standard 6206A) to step down the voltage cleanly, ensuring stable wireless performance. 2. The Bluetooth SoC Block