IFD:Printed Interfaces/introduction to electronics: Difference between revisions

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Clemensw

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 * In printed electronics, we use capacitors to detect the presence of fingers by a change in capacitance
 [http://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000005+10.20027730826997+50+5+43%0Av+-112+16+-112+-64+0+2+400+5+0+0+0.5%0Ax+-208+68+-1+71+4+12+Fast%5Cssignals%5Cspass%5Csthrough%5Cscapacitors!%0Ax+-206+-135+-34+-132+4+20+Capacitive%5CsSensors%0Aw+-112+16+32+16+0%0Ar+32+16+32+-64+0+1000%0Ac+-112+-64+32+-64+0+1e-9+-5%0Ax+-211+145+340+148+4+12+When%5Cswe%5Csapproach%5Csthis%5Csplate%5Cswith%5Csour%5Csfingers,%5Csit%5Csforms%5Csa%5Cssecond%5Csplate%5Csand%5Csincreases%5Csthe%5Cscapacitance,%0Ax+-209+93+213+96+4+12+The%5Csamplitude%5Csof%5Csthe%5Cssignal%5Csthat%5Cspasses,%5Csdepends%5Cson%5Csthe%5Cssize%5Csof%5Csthe%5Cscapacitor.%0Ax+-209+116+141+119+4+12+With%5Cscapacitove%5Cssensors,%5Cswe%5Csprint%5Csonly%5Csone%5Csplate%5Csof%5Csthe%5Cscapacitor.%0Ax+-208+171+95+174+4+12+which%5Csin%5Csturns%5Csamplifies%5Csthe%5Cssignal%5Csthat%5Cspasses%5Csthrough.%0Ax+-208+197+71+200+4+12+We%5Cscan%5Csmeasure%5Csthis%5Cssignal%5Cswith%5Csa%5Csmicro%5Cscontroller!%0Ao+0+8+0+4098+5+0.1+0+2+0+3%0Ao+4+8+0+4098+5+0.1+1+2+4+3%0A Capacitive Sensors]
+* Here is a circuit for driving an LED:
+[http://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000005+10.20027730826997+50+5+43%0Ar+-240+-48+-144+-48+0+100%0Av+-240+32+-240+-48+0+0+40+5+0+0+0.5%0A370+-64+-48+-64+32+1+0%0Ax+-315+101+405+104+4+12+For%5Csdriving%5Csan%5CsLED%5Cswithout%5Csdestroying%5Csit,%5Csyou%5Csneed%5Csto%5Csadd%5Csa%5Csseries%5Csreistor%5Cs(R).%5CsTo%5Cscalculate%5Csthe%5Cscorrect%5Csresistance,%5Csuse%5Csthe%5Csformula%5Csabove!%0Ax+41+-55+160+-52+4+18+R%5Cs%5Cq%5Cs(Vs%5Cs-%5CsVf)%5Cs/%5CsI%0Aw+-240+32+-240+48+0%0Aw+-240+48+-64+48+0%0Aw+-64+48+-64+32+0%0Ap+-304+-48+-304+48+1+0%0Aw+-304+48+-240+48+0%0Aw+-304+-48+-240+-48+0%0Ax+-88+-159+33+-156+4+18+Driving%5Csan%5CsLED%0Ad+-144+-48+-64+-48+2+old-default-led%0Ap+-144+-96+-64+-96+1+0%0Aw+-144+-96+-144+-48+0%0Aw+-64+-96+-64+-48+0%0Aw+-240+-48+-240+-96+0%0Ap+-240+-96+-144+-96+1+0%0Ax+43+-23+185+-20+4+12+Vs%5Cs...%5Csvoltage%5Csof%5Csthe%5Cssource%0Ax+44+6+332+9+4+12+Vf%5Cs...%5Csforward%5Csvoltage%5Csdrop%5Csof%5Csthe%5CsLED%5Cs(from%5Csdatasheet)%0Ax+45+32+434+35+4+12+I...%5Csdesired%5Cscurrent%5Csthrough%5CsLED%5Cs(below%5Csmaximum%5Cscurrent%5Csfrom%5Csdatasheet)%0Ao+2+64+0+4099+0.0000762939453125+0.1+0+2+2+3%0A LED circuit]