{"product_id":"mikroe-4124-wheatstone-click-board-uk","title":"Wheatstone Click Board™","description":"\u003ch3\u003eHow Does The Wheatstone Click Board™ Work?\u003c\/h3\u003e\n\n\u003cp\u003eA Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two branches of a bridge circuit, one branch of which includes the unknown component. The primary benefit of the circuit is its ability to provide extremely accurate measurements, in contrast with a simple voltage divider.\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg alt=\"wheatstone click inner image\" data-entity-type=\"\" data-entity-uuid=\"\" data-mce-src=\"https:\/\/www.mikroe.com\/img\/images\/wheatstone-click-inner-img.jpg\" src=\"https:\/\/www.mikroe.com\/img\/images\/wheatstone-click-inner-img.jpg\"\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe R2, R3, and R4 are resistors of known resistance (1k ohm), while the resistance R1 is brought to the terminal block and therefore it is changeable. With no resistance connected to the terminal block, the bridge on the \u003cstrong\u003eWheatstone Click Board™\u003c\/strong\u003e is in balance. At this point, the voltage between the two midpoints (IN- and IN+) will be zero. Therefore the ratio of the two resistances in the known branch (R1 and R3) is equal to the ratio of the two resistances in the unknown leg (R2 and R4). If the external resistance is connected to the terminal block, bridge is unbalanced, and the voltage on the midpoints is proportional to the external resistor value.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eWheatstone Click Board™\u003c\/strong\u003e is based around the MAX4208 IC, which is connected to an onboard Wheatstone bridge circuit, in order to precisely measure the resistance of an external element. The mentioned IC uses a spreadspectrum, autozeroing technique that constantly measures and corrects the input offset, eliminating drift over time and temperature and the effect of 1\/f noise. This technique achieves less than 20μV offset voltage, allows ground-sensing capability, provides ultra-low CMOS input bias current and increased common-mode rejection performance. It also provides high-impedance inputs, optimized for small-signal differential voltages (±100mV), which makes it ideal for an application such as wheatstone bridge disbalance measurement.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eWheatstone Click Board™\u003c\/strong\u003e also has TPL0501 onboard - 256-Taps, Single-Channel, Digital Potentiometer With SPI Interface, from texas instruments. It is connected to the MAX4208 in a way that it serves an gain adjust instead of with two external resistors\u003c\/p\u003e\n\n\u003cp\u003eThe power supply voltage selection for the logic section is done by moving the SMD jumper labeled as VCC SEL to a desired position: left position to select 3.3V, right position to select 5V. This will allow both 3.3V and 5V MCUs to be interfaced with the Click board™ directly.\u003c\/p\u003e\n\n\u003ch3\u003eSPECIFICATIONS\u003c\/h3\u003e\n\n\u003ctable\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eType\u003c\/td\u003e\n            \u003ctd\u003eMeasurements\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eApplications\u003c\/td\u003e\n            \u003ctd\u003eThe \u003cstrong\u003eWheatstone Click Board™\u003c\/strong\u003e is ideal for using in various applications which may include sensor readings and precise resistance measurements.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eOn-board modules\u003c\/td\u003e\n            \u003ctd\u003eMAX4208 – an ultra-low offset\/drift, precision instrumentation amplifier, from Maxim Integrated TPL0501 onboard - 256-Taps, Single-Channel, Digital Potentiometer With SPI Interface, from texas instruments\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eKey Features\u003c\/td\u003e\n            \u003ctd\u003eultra-low offset\/drift, Spread-Spectrum, Auto-Zero, Low Offset Voltage Drift and more\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eInterface\u003c\/td\u003e\n            \u003ctd\u003eAnalog,SPI\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eCompatibility\u003c\/td\u003e\n            \u003ctd\u003emikroBUS\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eClick board size\u003c\/td\u003e\n            \u003ctd\u003eL (57.15 x 25.4 mm)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eInput Voltage\u003c\/td\u003e\n            \u003ctd\u003e3.3V or 5V\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePINOUT DIAGRAM\u003c\/h3\u003e\n\n\u003cp\u003eThis table shows how the pinout on the \u003cstrong\u003eWheatstone Click Board™\u003c\/strong\u003e corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).\u003c\/p\u003e\n\n\u003ctable width=\"549\"\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003cth\u003eNotes\u003c\/th\u003e\n            \u003cth\u003ePin\u003c\/th\u003e\n            \u003cth colspan=\"4\"\u003e\u003cimg alt=\"Mikrobus logo.png\" data-entity-type=\"\" data-entity-uuid=\"\" data-mce-src=\"https:\/\/cdn.mikroe.com\/img\/mikrobus\/mikroBUS-logo-black.png\" src=\"https:\/\/cdn.mikroe.com\/img\/mikrobus\/mikroBUS-logo-black.png\"\u003e\u003c\/th\u003e\n            \u003cth\u003ePin\u003c\/th\u003e\n            \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eAnalog\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003eOUT\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e1\u003c\/td\u003e\n            \u003ctd\u003eAN\u003c\/td\u003e\n            \u003ctd\u003ePWM\u003c\/td\u003e\n            \u003ctd\u003e16\u003c\/td\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n            \u003ctd\u003e2\u003c\/td\u003e\n            \u003ctd\u003eRST\u003c\/td\u003e\n            \u003ctd\u003eINT\u003c\/td\u003e\n            \u003ctd\u003e15\u003c\/td\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSPI Chip Select\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003eCS\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e3\u003c\/td\u003e\n            \u003ctd\u003eCS\u003c\/td\u003e\n            \u003ctd\u003eRX\u003c\/td\u003e\n            \u003ctd\u003e14\u003c\/td\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSPI Clock\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003eSCK\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e4\u003c\/td\u003e\n            \u003ctd\u003eSCK\u003c\/td\u003e\n            \u003ctd\u003eTX\u003c\/td\u003e\n            \u003ctd\u003e13\u003c\/td\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n            \u003ctd\u003e5\u003c\/td\u003e\n            \u003ctd\u003eMISO\u003c\/td\u003e\n            \u003ctd\u003eSCL\u003c\/td\u003e\n            \u003ctd\u003e12\u003c\/td\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n            \u003ctd\u003e6\u003c\/td\u003e\n            \u003ctd\u003eMOSI\u003c\/td\u003e\n            \u003ctd\u003eSDA\u003c\/td\u003e\n            \u003ctd\u003e11\u003c\/td\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003ePower Supply\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003e3.3V\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e7\u003c\/td\u003e\n            \u003ctd\u003e3.3V\u003c\/td\u003e\n            \u003ctd\u003e5V\u003c\/td\u003e\n            \u003ctd\u003e10\u003c\/td\u003e\n            \u003ctd\u003eNC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eGround\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003eGND\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e8\u003c\/td\u003e\n            \u003ctd\u003eGND\u003c\/td\u003e\n            \u003ctd\u003eGND\u003c\/td\u003e\n            \u003ctd\u003e9\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003eGND\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eGround\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eONBOARD SETTINGS AND INDICATORS\u003c\/h3\u003e\n\n\u003ctable\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003cth\u003eLabel\u003c\/th\u003e\n            \u003cth\u003eName\u003c\/th\u003e\n            \u003cth\u003eDefault\u003c\/th\u003e\n            \u003cth\u003e Description\u003c\/th\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003ePWR\u003c\/td\u003e\n            \u003ctd\u003ePWR\u003c\/td\u003e\n            \u003ctd\u003e-\u003c\/td\u003e\n            \u003ctd\u003ePower LED Indicator\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eVCC SEL\u003c\/td\u003e\n            \u003ctd\u003eJP1\u003c\/td\u003e\n            \u003ctd\u003eLeft\u003c\/td\u003e\n            \u003ctd\u003eLogic voltage level selection: left position 3.3V, right position 5V\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eVREF SEL\u003c\/td\u003e\n            \u003ctd\u003eJP2\u003c\/td\u003e\n            \u003ctd\u003eLeft\u003c\/td\u003e\n            \u003ctd\u003eReference voltage selection: left position 2.5V, right position EXT\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eEXT VREF\u003c\/td\u003e\n            \u003ctd\u003eJP1\u003c\/td\u003e\n            \u003ctd\u003e-\u003c\/td\u003e\n            \u003ctd\u003eExternal reference voltage connection jumper\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eRX\u003c\/td\u003e\n            \u003ctd\u003e-\u003c\/td\u003e\n            \u003ctd\u003e-\u003c\/td\u003e\n            \u003ctd\u003eLoad cell excitation voltage connector\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e \u003c\/h3\u003e","brand":"Mikroelektronika d.o.o.","offers":[{"title":"Default Title","offer_id":37768474296509,"sku":"MIKROE-4124","price":42.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0522\/6931\/8333\/products\/mikroelektronika-d-o-o-click-board-wheatstone-click-board-28817529372861.jpg?v=1685158143","url":"https:\/\/thedebugstore.com\/en-de\/products\/mikroe-4124-wheatstone-click-board-uk","provider":"Debug Store","version":"1.0","type":"link"}