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.
Published by: Embedded Tech Insights
Reading Time: 6 minutes
When you are searching for the term "yl105 datasheet better," you aren't just looking for pinouts and voltage ratings. You want a comparative analysis. You want to know: Why should I choose the YL105 over the DHT11, DHT22, or the AM2302? yl105 datasheet better
In the crowded world of capacitive humidity sensors, the YL105 is often misunderstood. Viewed by beginners as a "cheap alternative," this sensor module—when paired with a correct reading of its datasheet—offers a superior price-to-performance ratio for 80% of DIY and commercial IoT projects.
This article breaks down the YL105 datasheet in detail and explains exactly where, why, and how this sensor is better than its more famous rivals.
Download our free YL-105 Missing Appendix PDF (link below) which includes: Most YL-105 datasheets omit dynamic timing
Stop guessing. Start measuring accurately. Your plants will thank you.
Keywords: yl105 datasheet better, yl-105 soil moisture calibration, capacitive sensor drift fix, improve yl105 accuracy.
This will help me provide a more accurate and relevant response. Why does this matter
The YL-105 datasheet ignores cable capacitance. If your cable to the sensor exceeds 30cm, readings drop by 10%.
The standard module includes a comparator (LM393) for digital output. Throw that away. The potentiometer drifts with temperature.
| Parameter | Value | Why it matters | | :--- | :--- | :--- | | Operating Voltage | 3.3V to 5.5V | Better compatibility (works with 3.3V ESP32 & 5V Arduino) | | Humidity Range | 20% to 90% RH | Standard room conditions | | Humidity Accuracy | ±5% RH | Comparable to DHT11 | | Temperature Range | 0°C to 50°C | Indoor/Greenhouse focused | | Temperature Accuracy | ±2°C | Adequate for HVAC monitoring | | Sampling Rate | 1 Hz (1 reading per second) | Better stability than cheap clones | | Signal Type | Single-bus digital | Uses only 1 GPIO pin |
The "Better" Factor: The datasheet explicitly notes that the YL105 includes a 10kΩ pull-up resistor. The raw DHT11 does not. This means the YL105 is better for beginners because you don't need external components to make it work.
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.