{"id":6577,"date":"2026-06-18T15:23:44","date_gmt":"2026-06-18T15:23:44","guid":{"rendered":"https:\/\/materialparts.com\/dht22\/"},"modified":"2026-06-18T15:23:44","modified_gmt":"2026-06-18T15:23:44","slug":"dht22","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/dht22\/","title":{"rendered":"DHT22"},"content":{"rendered":"

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The DHT22 (AM2302) from Aosong is a high-accuracy digital temperature and humidity sensor with +\/-0.5C temperature accuracy and +\/-2% RH humidity accuracy. It uses the same single-wire protocol as the DHT11 but with 16-bit resolution and wider operating ranges. Packaged in a 4-pin through-hole module with white housing.<\/p>\n

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Temperature Range<\/td>\n-40 to +80C<\/td>\n<\/tr>\n
Temperature Accuracy<\/td>\n+\/-0.5C<\/td>\n<\/tr>\n
Temperature Resolution<\/td>\n16-bit (0.1C)<\/td>\n<\/tr>\n
Humidity Range<\/td>\n0% to 100% RH<\/td>\n<\/tr>\n
Humidity Accuracy<\/td>\n+\/-2% RH<\/td>\n<\/tr>\n
Humidity Resolution<\/td>\n16-bit (0.1% RH)<\/td>\n<\/tr>\n
\u0627\u0644\u0648\u0627\u062c\u0647\u0629<\/td>\nSingle-wire digital (proprietary)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n3.3V to 5.5V<\/td>\n<\/tr>\n
Sampling Period<\/td>\n2 seconds (minimum)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40 to +80C<\/td>\n<\/tr>\n<\/table>\n

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    \n
  • High accuracy: +\/-0.5C temperature, +\/-2% RH humidity<\/li>\n
  • 16-bit resolution: 0.1C and 0.1% RH<\/li>\n
  • Wide operating range: -40 to +80C, 0-100% RH<\/li>\n
  • Single-wire digital interface<\/li>\n
  • Long transmission distance (up to 20m)<\/li>\n<\/ul>\n

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      \n
    • Professional weather stations<\/li>\n
    • Industrial environmental monitoring<\/li>\n
    • Agricultural and greenhouse control<\/li>\n
    • Home automation HVAC systems<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The DHT22 (AM2302) from Aosong is a high-accuracy digital temperature and humidity sensor with +\/-0.5C temperature accuracy and +\/-2% RH humidity accuracy. It uses the same single-wire protocol as the DHT11 but with 16-bit resolution and wider operating ranges. Packaged in a 4-pin through-hole module with white housing. Key Specifications Temperature Range -40 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,42],"tags":[],"chip_brand":[144],"class_list":["post-6577","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","chip_brand-on"],"acf":{"brief_explanation":"High-accuracy temp+humidity sensor, -40~80C +\/-0.5C, 0-100%RH +\/-2%, 16-bit","date_code":"","package_case":"4-pin through-hole (white body)","in_stock":11870,"datasheet":"https:\/\/cdn-shop.adafruit.com\/datasheets\/Digital+humidity+and+temperature+sensor+AM2302.pdf","price":"$4.50 @ 1ku","product_introduction":"The DHT22 (also known as AM2302) from Aosong is a high-accuracy digital temperature and humidity sensor that significantly upgrades the DHT11 platform. With 16-bit resolution providing 0.1C and 0.1% RH steps, +\/-0.5C temperature accuracy, and +\/-2% RH humidity accuracy, it is suitable for professional environmental monitoring. The sensor covers a wide operating range of -40 to +80C and 0-100% RH. It uses the same single-wire protocol as the DHT11 but transmits 40 bits of 16-bit data. The minimum sampling interval is 2 seconds. The white housing distinguishes it from the blue DHT11.","working_principle":"The DHT22 uses a capacitive humidity sensing element and a bandgap temperature sensor paired with a built-in ADC and microcontroller. The capacitive humidity sensor changes its capacitance proportionally to ambient relative humidity. The bandgap temperature sensor provides a voltage proportional to absolute temperature. The internal MCU digitizes both readings to 16-bit resolution and stores calibrated values. Communication uses the same single-wire protocol as the DHT11: the host initiates by pulling DATA low for at least 1ms, the sensor responds with 80us low and 80us high sync pulses, then transmits 40 bits (16-bit humidity + 16-bit temperature + 8-bit checksum). Bit encoding uses 26-28us high for 0, 70us high for 1.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>VDD<\/td>Power supply (3.3-5.5V)<\/td><\/tr>
      2<\/td>DATA<\/td>Single-wire data I\/O (4.7k-10k pull-up required)<\/td><\/tr>
      3<\/td>NC<\/td>Not connected<\/td><\/tr>
      4<\/td>GND<\/td>Ground<\/td><\/tr><\/table>","application_scenarios":"
      • Professional weather stations with +\/-0.5C and +\/-2% RH accuracy<\/li>
      • Industrial environmental monitoring across -40 to +80C range<\/li>
      • Agricultural greenhouse control with 0-100% RH full range measurement<\/li>
      • Home automation HVAC systems needing higher accuracy than DHT11<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Key Difference<\/th><\/tr>
        DHT11<\/td>Aosong<\/td>Lower cost, +\/-2C, 0-50C only<\/td><\/tr>
        SHT31-DIS<\/td>Sensirion<\/td>I2C, +\/-0.3C, +\/-2%RH, smaller<\/td><\/tr>
        BME280<\/td>Bosch<\/td>I2C\/SPI, adds pressure sensor<\/td><\/tr>
        Si7021-A20<\/td>Silicon Labs<\/td>I2C, +\/-0.4C, +\/-3%RH, low power<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6577","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=6577"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6577\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6577"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6577"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}