{"product_id":"gy-21-htu21d-iic-i2c-digital-temperature-humidity-sensor-breakout-board-module-for-weather-stations-humidor-control-3-3v","title":"GY-21 HTU21D IIC\/I2C Digital Temperature \u0026 Humidity Sensor Breakout Board Module For Weather Stations Humidor Control 3.3V","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNONE\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\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"product-description\" id=\"product-description\"\u003e\n\u003cdiv class=\"\"\u003e\n\u003cdiv class=\"\"\u003e\n\u003ch1 data-spm-anchor-id=\"a2g0o.detail.1000023.i0.4f8dW53iW53iNP\" style='box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; font-family: \"font-size:24px;font-weight:500;line-height:36px;color:rgb(0, 0, 0);margin:0.67em 0px 12px;box-sizing:border-box;margin:0.67em 0px 12px;\";'\u003eGY-21 HTU21D Temperature Humidity Sensor Breakout Board Module\u003c\/h1\u003e\n\n\u003cp data-spm-anchor-id=\"a2g0o.detail.1000023.i1.4f8dW53iW53iNP\" style='box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px; margin: 0px; padding: 0px; line-height: inherit; color: rgb(34, 34, 34); font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; font-family: \"font-size:14px;line-height:inherit;color:rgb(0, 0, 0);margin:0px;box-sizing:border-box;margin:0px;\";'\u003e\u003cspan style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px; margin: 0px; padding: 0px; max-width: 100%; word-break: break-word; font-size: 16px;\"\u003eThe HTU21D is a low-cost, easy to use, highly accurate, digital humidity and temperature sensor.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nThis sensor is ideal for environmental sensing and data logging and perfect for a weather stations or humidor control systems.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nAll you need is two lines for I2C communication and you'll have relative humidity readings\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nand very accurate temperature readings as a bonus!\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\n\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nThere are only four pins that need to be hooked up in order to start using this sensor in a project.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nOne for VCC, one for GND, and two data lines for I2C communication.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nThis breakout board has built in 4.7k pull up resistors for I2C communications.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nIf you're hooking up multiple I2C devices on the same bus, you may want to disable these resistors.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\n\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nIt's summer and you're sweating and your hair's all frizzy and all you really want to\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nknow is why the weatherman said this morning that today's relative humidity would max\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nout at a perfectly reasonable 52% when it feels more like 77%.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nEnter the HTU21D-F Temperature + Humidity Sensor - the best way to prove the weatherman wrong!\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\n\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nThis I2C digital humidity sensor is an accurate and intelligent alternative to the much simpler\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nHumidity and Temperature Sensor - SHT15 Breakout It has a typical accuracy of ±2% with an\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\noperating range that's optimized from 5% to 95% RH. Operation outside this range\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nis still possible - just the accuracy might drop a bit. The temperature output has\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nan accuracy of ±1°C from -30~90°C. If you're looking to measure temperature more accurately,\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nwe recommend the MCP9808 High Accuracy I2C Temperature Sensor Breakout Board.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\n\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nSuch a lovely chip - so we spun up a breakout board that includes the\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nFiltered version (the white bit of plastic which is a PTFE filter to keep the sensor clean),\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\na 3.3V regulator and I2C level shifting circuitry. This lets you use it safely with any kind\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nof microcontroller with 3.3V-5V power or logic. Each order comes with one fully assembled\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nand tested PCB breakout and a small piece of header.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nYou'll need to solder the header onto the PCB but it's fairly easy and takes only a few minutes even for a beginner.\u003cbr style=\"box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px;\"\u003e\nBoard size:1.2x1cm(approx)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\r\n","brand":"DOLLAR CHARM","offers":[{"title":"Default Title","offer_id":49331063488750,"sku":"\u003cnone\u003e","price":5.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/7065\/9566\/files\/Sfaac67bed5404daf8b07e04c1f220609B.webp?v=1785429232","url":"https:\/\/dollarcharm.com\/products\/gy-21-htu21d-iic-i2c-digital-temperature-humidity-sensor-breakout-board-module-for-weather-stations-humidor-control-3-3v","provider":"DOLLAR CHARM","version":"1.0","type":"link"}