{"product_id":"4-4-matrix-16-push-button-keyboard-module","title":"4×4 Matrix 16 Push Button Keyboard Module","description":"\u003cp\u003eThe 4 x 4 matrix keypad usually is used as input in a project. It has 16 keys in total, which means the same input values. The 4 x 4 Matrix Keypad Module is a matrix non-encoded keypad consisting of 16 keys in parallel. The keys of each row and column are connected through the pins outside – pin R1-R4 as labeled beside control the rows, when L1-L4, the columns.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eA 4x4 matrix keypad consisting of microswitch buttons. The module has four holes 3mm (M3) holes for mounting. The pin designations on each PCB are shown on each PCB. Four pins are thus used as an 'x' coordinate and the other 4 as a 'y' coordinate. The module is already equipped with soldered pin headers (rotated 90 degrees).\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eHow it Works:\u003c\/p\u003e\n\u003cp\u003eFirst test whether any key is pressed down. Connect power to rows, so they are High level. Then set all the rows R1-R4 as Low and then detect the status of the columns. Any column of Low indicates there is key pressing and that the key is among the 4 keys of the column. If all columns are High, it means no key is pressed down. Next, locate the key. Since the column in which the pressed key lies is identified, knowing the line would finalize the testing. Thus, set the rows as Low in turns until any is unveiled accordingly – other rows will still be High. Now the row can be identified. Detect the status of each column in turns. The column tested Low is the one intersecting with the line – their cross point is just the key pressed.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eNote: This keyboard module is available in red and black colours of push-button, we will ship it randomly.\u003c\/p\u003e\n\u003cp\u003eFeatures:\u003c\/p\u003e\n\u003cp\u003e4x4 Matrix Keyboard Module with 16 buttons\u003c\/p\u003e\n\u003cp\u003eSmall in size and hence Save space\u003c\/p\u003e\n\u003cp\u003eMore convenient to use\u003c\/p\u003e\n\u003cp\u003eExpanded development application modules for single chip\u003c\/p\u003e\n\u003cp\u003eWith 16 keys and 8 pin\u003c\/p\u003e\n\u003cp\u003ePackage Includes:\u003c\/p\u003e\n\u003cp\u003e1 x 4x4 Matrix 16 Push Button Keyboard Module \u003c\/p\u003e\n\u003cp\u003eSpecification:\u003c\/p\u003e\n\u003cp\u003eItem Type: Keypad Module\u003c\/p\u003e\n\u003cp\u003eSwitch Type Momentary\u003c\/p\u003e\n\u003cp\u003ePin Spacing (mm) 2.54\u003c\/p\u003e\n\u003cp\u003eLength (mm): 57\u003c\/p\u003e\n\u003cp\u003eWidth (mm): 33\u003c\/p\u003e\n\u003cp\u003eWeight (g): 10\u003c\/p\u003e\n\u003cp\u003eShipping Weight 0.015 kg\u003c\/p\u003e\n\u003cp\u003eShipping Dimensions 8 × 6 × 2 cm\u003c\/p\u003e","brand":"Jaideep Robotics","offers":[{"title":"Default Title","offer_id":46750301421741,"sku":"400497","price":71.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0773\/7638\/9293\/files\/download_24.jpg?v=1783165482","url":"https:\/\/jaideeprobotics.com\/products\/4-4-matrix-16-push-button-keyboard-module","provider":"Jaideep Robotics ","version":"1.0","type":"link"}