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Understanding the YL-105 Adapter Board: Datasheet and Integration Guide
(specifically the FIT-221 YL105 series) is a general-purpose, yellow-colored heat shrink tubing manufactured by Alpha Wire yl105 datasheet
Note: While the power input is safely stepped down to 3.3V, the data pins (MOSI, MISO, SCK, CE, CSN) bypass the regulator and pass directly to the transceiver. Fortunately, the data input pins on the nRF24L01 chip are 5V-tolerant, meaning logic level shifters are usually unnecessary when pairing it with a 5V MCU. Input / Microcontroller Interface Side the data pins (MOSI
Found in battery chargers for small appliances. yl105 datasheet
: Power input pin connected to the 5V line of the microcontroller. GND : Common ground pin connected to the system ground.