https://wiki.jw-tech.eu/index.php?action=history&feed=atom&title=WSAL11092_%E2%80%93_DHT22_Temperature-Humidity_Sensor%2Fen 2026-10-23T22:23:58Z Versionsgeschichte dieser Seite in JW Tech Wiki MediaWiki 1.43.9 https://wiki.jw-tech.eu/index.php?title=WSAL11092_%E2%80%93_DHT22_Temperature-Humidity_Sensor/en&diff=1936&oldid=prev 2026-09-05T22:39:39Z

<p>Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex</p> <p><b>Neue Seite</b></p><div>__NOINDEX__<br /> &#039;&#039;&#039;Documentation notice:&#039;&#039;&#039; This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br /> <br /> == Summary ==<br /> Calibrated digital temperature and humidity module (AM2302) for measuring ambient temperature and humidity via a single-wire interface.<br /> <br /> == Related products at JW Tech ==<br /> * [https://shop.jw-tech.eu/p/WSAL11092 WSAL11092 – DHT22 Temperature-Humidity Sensor]<br /> <br /> == Technical overview ==<br /> * Sensor: DHT22 (AM2302); calibrated digital module with higher accuracy and wider range than the DHT11.<br /> * Temperature resolution 0.1 °C; accuracy ±0.5 °C; range −40 °C to 80 °C.<br /> * Humidity resolution 0.1 %RH; accuracy ±2 %RH at 25 °C; range 0 %RH to 99.9 %RH.<br /> * Operating voltage: 3.3 V to 5.5 V.<br /> * Recommended storage conditions: 10 °C to 40 °C, humidity ≤ 60 %RH.<br /> * Pins: Pin 1 = VCC (power), Pin 2 = GND, Pin 3 = DOUT (SDA data line of the AM2302).<br /> * Communication uses a simplified single-bus protocol; in idle state the bus line is pulled HIGH by an external pull-up resistor of about 5.1 kΩ.<br /> * One transmission carries 40 bits, MSB first: humidity high/low, temperature high/low, parity bit.<br /> * Start signal: host pulls SDA low for at least 800 µs; the sensor responds with 80 µs LOW followed by 80 µs HIGH.<br /> * After the start signal the sensor transmits 40 bits serially; the parity bit equals the sum of the four data words modulo 2.<br /> <br /> == Notes and version constraints ==<br /> * The source contains no explicit commands or API calls for the DHT22; concrete code examples are not included in the provided text.<br /> * Accuracy specifications apply only under the stated reference conditions (e.g., ±2 %RH at 25 °C); deviations at other temperatures are expected.<br /> * The single-bus timing (800 µs start, 80 µs response, 50/70 µs bit encoding) is version-sensitive; changes to the sensor firmware may alter the protocol.<br /> * Storage conditions (10–40 °C, ≤60 %RH) are recommended values, not guarantees; prolonged storage outside this range may affect calibration.<br /> <br /> == Source and revision record ==<br /> * [https://www.waveshare.com/wiki/DHT22_Temperature-Humidity_Sensor DHT22 Temperature-Humidity Sensor - Waveshare Wiki]<br /> * Source revision: 68965<br /> * Captured: 2026-08-30T02:44:52+00:00<br /> * SHA-256: &lt;code&gt;1260b0ccfa65f889a8c8c6fcadd22a4842f31b2335a825c8e3b61690367fda4c&lt;/code&gt;</div>

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