A truly better datasheet would be a living document, including application notes, oscilloscope captures, and a failure mode analysis. Until then, treat every YL-105 datasheet as a starting point, not an ending one. Probe the signals, test the limits, and always— always —design with a safety margin. In the world of relay modules, the difference between a prototype and a product is the quality of the questions you ask of the datasheet. Ask better questions, build safer circuits.
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
After scouring GitHub, Hackaday, and Chinese forums, the answer is . There is no official v2.0 datasheet. The YL-105 is a victim of its own success — so cheap that manufacturers don't bother with documentation. A truly better datasheet would be a living
When comparing the YL105 adapter to a direct connection, the advantages are clear: : Standard Arduino pins often provide only . The YL105 leverages the rail to provide up to In the world of relay modules, the difference
If your modules aren't "talking," check these three common pitfalls:
Desolder the LM393 chip. Connect the sensor’s center pad directly to an analog pin (via a 1kΩ resistor for protection). The comparator’s hysteresis ruins precision.
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.