{"product_id":"aht21-precision-digital-temperature-and-humidity-sensor-measurement-module-aht21b-i2c-communication-replace-sht20-for-arduino-1","title":"AHT21 Precision Digital Temperature And Humidity Sensor Measurement Module AHT21B I2C Communication Replace SHT20 FOr Arduino","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eApplication\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eComputer\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eSZYTF\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eChoice\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eyes\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCondition\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNew\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eDissipation Power\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eN\/A\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003enone\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOperating Temperature\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eN\/A\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eSupply Voltage\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eN\/A\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eType\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eModule\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eis_customized\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eYes\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003esemi_Choice\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eyes\u003c\/span\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003e1. AHT21B- Temperature and Humidity sensor:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eComplete calibration\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eDigital output, I²C interface\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eP2C interface\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eExcellent long-term stability\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eQuick response\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eStrong anti-interference ability\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eA variety of accessories are available for customized applications\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eAHT21B Digital Temperature and humidity module is a temperature and humidity composite sensor with calibrated digital signal output. It uses special digital module acquisition technology and temperature and humidity sensing technology to ensure that the product has very high reliability and excellent long-term stability. The product has the advantages of excellent quality, rapid response, strong anti-interference ability and high cost performance. Each sensor is calibrated in a professional humidity check room to achieve higher accuracy standards. The standard l2C interface makes the system integration easy and fast. Its small size and low power consumption make it the best choice for all kinds of applications, even the most demanding.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S8c978251e78445eda6a9ef01c6af90ae9.jpg?width=800\u0026amp;height=555\u0026amp;hash=1355\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003e2. Application scenario:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003eHvac, dehumidifier, test and detection equipment, consumer goods, automobiles, automatic control, data recorder, weather station, home appliances, humidity regulation, medical and other related temperature and humidity detection and control.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003e3. Product parameters:\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sff7da073765144519e849766b3642cbed.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S893ad57dc5bb415798a8439a0b48292e5.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003e4. Sensor performance：\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S5bf7507c36de4865819aa5e6dcbef51eG.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S864a7d5468c34f3bb09973d43c5c7105h.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S82335ea24ac2493f81e442198dd70eddq.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S9e132dc22ca84ea8af0cfaf09a273c1di.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003e5. Interface definition:\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S273b269f6ca948a99a8e30cdfec0ed56f.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003e1. VCC: power supply voltage\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003e2. SDA: serial data, two-way port\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003e3. GND: ground\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003e4. SCL: serial data, two-way port\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003ePower pin (VDD,GND)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eThe power supply range of AHT21B is 2.0-5.5V, the recommended voltage is 3.3V, and the decoupling capacitor 100NF must be added between VCC and GND to act as a filter.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eSerial clock SCL\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eSCL is used for communication synchronization between microprocessor and AHT21B. Because the interface contains completely static logic, there is no minimum SCL frequency.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eSerial data SDA\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eSDA pins are used for data input and output of the sensor. SDA is effective on the rising edge of the serial clock SCL when the command is sent to the sensor, and SDA must remain stable when the SCL is at high level. After the falling edge of SCL, the SDA value can be changed. To ensure communication security, the effective time of SDA should be extended to TSU AND THO before the rising edge of SCL and after the falling edge of SCL, respectively. When reading data from the sensor, SDA is effective after the SCL becomes low (TV) and remains effective until the falling edge of the next SCL.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003e6. Typical application circuit：\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se633fb1078de4947bda47fa4f876b9d2u.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eTo avoid signal collisions, microprocessors (MCU) must only drive SDA and SCL at low levels. An external pull-up resistor (e.g. 4.7~10KO) is required to pull the signal to high levels. Pull-up resistors may usually be included in the microprocessor's I\/○ circuit.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color:rgb(224, 62, 45)\"\u003e\u003cstrong\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003e7. Note:\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eThe pull-up voltage of SDA must be supplied by VCC, and the supply voltage range is 2.0~5.5V;\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eThe capacity between VCC and GND should be 100NF decoupling capacitor;\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:18.6667px\"\u003eAHT21B can share PC bus with other l2C devices.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style='font-size:14pt;font-family:\"times new roman\", times, serif'\u003e\u003cstrong\u003e8. Product picture:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;display:block;width:100%\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S96c7a1aa47bd4b38988b744f28f96352g.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S54168ac147e748848fdfca1b278f7de1s.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S8644da49bef7468aa47b1a415f28ee16z.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Saf488d12f58d4495aa42b5aa645c7e08v.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S26a43847de6048cb94ec4acb6f83dc96l.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003cbr\u003e","brand":"Yoeruyo","offers":[{"title":"China Mainland","offer_id":55378480791851,"sku":"200007763:201336100","price":6.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/5744\/8747\/files\/S8644da49bef7468aa47b1a415f28ee16z.webp?v=1788341231","url":"https:\/\/yoeruyo.com\/products\/aht21-precision-digital-temperature-and-humidity-sensor-measurement-module-aht21b-i2c-communication-replace-sht20-for-arduino-1","provider":"Yoeruyo","version":"1.0","type":"link"}