The YL-105 (frequently cross-referenced as the HW-200 breakout adapter ) functions as an intermediate power conditioner and pin-out mapping shield. By bridging the massive power gap between standard 5V microcontrollers like the Arduino Uno or Mega and 3.3V RF chips, it serves as a critical single-point voltage buffer. Official Specification Value Technical Relevance 5.0V DC to 7.0V DC Max Safe to power from standard USB rails or 5V MCU pins. Output Voltage 1.9V DC to 3.6V DC (Nominal 3.3V)
If you read the YL105 faster than 1 Hz (e.g., every 500ms), the internal thermistor will self-heat by 2-3°C. The datasheet does not warn about this clearly. Limit reads to once every 2 seconds for temperature accuracy, even if humidity can refresh faster.
*data = byte; return true;
Keep the high-current loop area as small as possible. Use wide copper traces or dedicated power planes to handle heavy current paths. This technique lowers voltage drops and reduces radiated EMI. 5. Comparative Evaluation: Why YL105 is the Better Choice
Stop fiddling with external pull-ups and faulty libraries. Download the original YL105 datasheet, follow the timing diagrams above, and build humidity logging that just works. yl105 datasheet better
With Analog data, you can program logic like: "If the rain value is < 500, close the skylight. If it's < 200, turn on the emergency sump pump."
The specific (e.g., hobbyist makers, professional PCB layout engineers) Any competing part numbers you want to compare it against Share public link Output Voltage 1
If you are reading this blog, you might be experiencing "jitter." Here are the fixes:
: Unfortunately, a formal manufacturer datasheet for this specific board is rare. The "better" documentation is a combination of its features. Search "YL-105 voltage regulator Arduino" or "YL-105 NRF24L01 adapter pinout" to find community guides, specs, and wiring diagrams. For details on the regulator chip itself, search for the AMS1117 datasheet . *data = byte; return true; Keep the high-current
Place high-frequency ceramic decoupling capacitors as close as possible to the VCC and GND pins. Keep trace lengths under 2mm to minimize stray inductance. Power Loops
: 5.0V DC (compatible with 51 microcontroller and Arduino systems). Output Voltage : Stable 1.9V to 3.6V DC (typically 3.3V). Operating Current : Approximately 12.3 mA.