Yl105 Datasheet Better May 2026
The YL105 datasheet reveals a 100nF decoupling capacitor on the power rails. The standard DHT11 module (the blue 3-pin version) often lacks sufficient capacitance. This means:
The YL-105 datasheet never mentions copper oxide formation. Over 48 hours, copper develops a patina that alters the dielectric baseline. A better approach: yl105 datasheet better
The datasheet says "non-condensing environment." But if condensation occurs, the sensor requires 2 hours of drying at 50°C. Better design: Mount the YL105 vertically, not horizontally, so water drips off the PCB. The YL105 datasheet reveals a 100nF decoupling capacitor
The datasheet mentions "VDD ripple < 50mV." In reality, if you power the YL105 from the same 5V rail as a servo motor, you will get +10% RH errors. Better solution: Use a dedicated 3.3V LDO regulator or add a 470µF capacitor on the power rail. The datasheet mentions "VDD ripple < 50mV
Most YL-105 datasheets omit dynamic timing. Yet, for sequencing or pulse-width modulation (PWM) control, this is fatal. Using a digital oscilloscope, a better datasheet would report:
Why does this matter? If you are toggling the relay faster than 50Hz, it will fail. If you are switching AC loads without zero-crossing detection, the bounce can cause arcing. A thoughtful datasheet would include a waveform diagram showing the relationship between the IN pulse, the coil voltage, and the contact closure, including bounce artifacts.
The stock YL-105 is not linear. The real transfer function (discovered via third-party testing) is:
Voltage_out = Vcc * (1 - e^(-k * Moisture))
Where k is approximately 0.45 for loamy soil. A better datasheet would include 5-point calibration (sand, silt, clay loam). You must generate this yourself.