{"product_id":"4-digits-digital-objects-counter-with-laser-wifi-esp32c3-tm1637","title":"4 digits digital objects counter with Laser - WiFi ESP32C3 +TM1637","description":"\u003cp\u003eThis is a compact, Wi-Fi enabled \u003cstrong\u003e4-digit digital object counter\u003c\/strong\u003e built around the \u003cstrong\u003eESP32-C3\u003c\/strong\u003e microcontroller and a \u003cstrong\u003e\u003ca href=\"https:\/\/buildcircuits.com\/products\/0-56-inch-tm1637-seven-segments-display-module-for-arduino?_pos=1\u0026amp;_sid=12572218a\u0026amp;_ss=r\" rel=\"noopener\" target=\"_blank\"\u003eTM1637\u003c\/a\u003e 4-digit LED display\u003c\/strong\u003e. It is designed for accurately counting objects using a \u003cstrong\u003elaser beam and photoresistor (LDR)\u003c\/strong\u003e, while also offering manual counting and browser-based control.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0217\/9979\/6836\/files\/TM1637digitalobjectscounter.jpg?v=1786139416\" alt=\"\" width=\"479\" height=\"271\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe counter is lightweight, easy to use, and ideal for production lines, packaging, laboratories, educational projects, and general object counting applications.\u003c\/p\u003e\n\u003ch2\u003eDemo Video\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe width=\"750\" height=\"420\" src=\"https:\/\/www.youtube.com\/embed\/T3puJF7G3wg\" title=\"TM1637\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eA \u003cstrong\u003e\u0026lt;1 mW laser module\u003c\/strong\u003e is directed at the \u003cstrong\u003eLDR (Light Dependent Resistor)\u003c\/strong\u003e mounted on the side of the counter. Whenever an object interrupts the laser beam, the counter automatically increments or decrements the count, depending on the selected operating mode.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0217\/9979\/6836\/files\/DImensions1.png?v=1786144486\" alt=\"\" width=\"485\" height=\"291\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0217\/9979\/6836\/files\/How_it_works.jpg?v=1786144331\" alt=\"\" width=\"573\" height=\"172\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe LDR sensitivity can be calibrated to suit different room lighting conditions, ensuring reliable operation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003ch3\u003eAutomatic Object Counting\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eCounts objects whenever the laser beam is interrupted.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUses an LDR (Light Dependent Resistor) as the optical sensor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSuitable for both indoor and controlled lighting environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUP Count and DOWN Count Modes\u003c\/h3\u003e\n\u003cp\u003eChoose how the counter behaves:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUP Count Mode:\u003c\/strong\u003e Counts upward (0, 1, 2, 3...).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDOWN Count Mode:\u003c\/strong\u003e Counts downward from a preset value (e.g. 3, 2, 1, 0...).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManual Counting\u003c\/h3\u003e\n\u003cp\u003eThree buttons are provided on the top of the unit:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUP\u003c\/strong\u003e – Increase the count.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDOWN\u003c\/strong\u003e – Decrease the count.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRESET\u003c\/strong\u003e – Reset the counter.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor rapid adjustment, press and hold the \u003cstrong\u003eUP\u003c\/strong\u003e or \u003cstrong\u003eDOWN\u003c\/strong\u003e button for approximately \u003cstrong\u003e3 seconds\u003c\/strong\u003e to enable fast counting.\u003c\/p\u003e\n\u003ch3\u003eBrowser-Based Control\u003c\/h3\u003e\n\u003cp\u003eThe built-in \u003cstrong\u003eESP32-C3\u003c\/strong\u003e creates a browser-based user interface, allowing users to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eIncrease or decrease the count remotely.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReset the counter.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnter any desired count value directly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSelect UP Count or DOWN Count mode.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnable or disable the LDR sensor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCalibrate the LDR.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAccess all counter functions from a phone, tablet, or computer.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA screenshot of the user interface is shown below.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0217\/9979\/6836\/files\/Screenshot.jpg?v=1786139140\" alt=\"\" width=\"209\" height=\"467\"\u003e\u003c\/p\u003e\n\u003ch3\u003eLDR Calibration\u003c\/h3\u003e\n\u003cp\u003eLighting conditions vary from room to room. If the photoresistor does not respond correctly to laser interruptions, simply press the \u003cstrong\u003eCalibrate\u003c\/strong\u003e button in the browser interface. The counter will automatically adjust its sensing threshold for the current ambient lighting.\u003c\/p\u003e\n\u003cp\u003eCalibration is optional and only needs to be performed when necessary.\u003c\/p\u003e\n\u003ch3\u003eDisable the LDR Sensor\u003c\/h3\u003e\n\u003cp\u003eIf you only want to use the device as a manual digital counter, the LDR function can be disabled. When disabled, interruptions to the laser beam are ignored, and counting is performed only using the buttons or the browser interface.\u003c\/p\u003e\n\u003ch3\u003eMemory Function\u003c\/h3\u003e\n\u003cp\u003eThe counter automatically saves the current count value in non-volatile memory.\u003c\/p\u003e\n\u003cp\u003eFor example:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eCurrent count: \u003cstrong\u003e2345\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePower is switched OFF.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhen powered ON again, the display will still show \u003cstrong\u003e2345\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThere is no need to reset or re-enter the count after a power outage.\u003c\/p\u003e\n\u003ch2\u003eDimensions\u003c\/h2\u003e\n\u003cp\u003e10.5cmx5.6cmx1.9cm\u003c\/p\u003e\n\u003ch2\u003eWeight\u003c\/h2\u003e\n\u003cp\u003e90gm\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003ePower Supply\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOperating Voltage: \u003cstrong\u003e5 V DC\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUSB-C power input\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan be powered using any standard \u003cstrong\u003e5 V USB phone charger\u003c\/strong\u003e or power bank.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eOptional Wireless Transmitter Feature\u003c\/h2\u003e\n\u003cp\u003eAn optional transmitter version is available.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"750\" height=\"420\" src=\"https:\/\/www.youtube.com\/embed\/2pc4Ms1xwFg\" title=\"\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003eIn this mode, the counter wirelessly transmits its count value to a larger \u003cstrong\u003eP3 or P5 digital object counter\/display\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis allows the compact counter to be installed close to the objects being counted, while the larger display is mounted at a convenient viewing location for operators or spectators.\u003c\/p\u003e\n\u003cp\u003eThis feature is ideal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eManufacturing and production lines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWarehouses\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePackaging stations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial counters\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePublic counting displays\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e4-digit TM1637 LED display\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eESP32-C3 microcontroller\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWi-Fi browser-based control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAutomatic laser\/LDR object detection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUP Count and DOWN Count modes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eManual count buttons\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFast count adjustment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAdjustable LDR calibration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOptional LDR disable mode\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNon-volatile memory (retains count after power loss)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUSB-C powered (5 V)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLightweight and portable\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOptional wireless transmitter for large remote displays\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Includes:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Counter module\u003c\/li\u003e\n\u003cli\u003e1 x Laser module\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BUILDCIRCUITS","offers":[{"title":"Default Title","offer_id":43186443976802,"sku":null,"price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0217\/9979\/6836\/files\/TM1637.jpg?v=1786139416","url":"https:\/\/buildcircuits.com\/products\/4-digits-digital-objects-counter-with-laser-wifi-esp32c3-tm1637","provider":"BUILDCIRCUITS","version":"1.0","type":"link"}