Kev Taw Qhia luv luv rau qhov muaj pes tsawg leeg thiab cov qauv ntawm Ultrasonic Range Finder
Ultrasonic generating Circuit Court yog ib tug ultrasonic generating circuit. Dual timer EN556 (U2b) yog ib qho monostable flip-flop. R6 thiab C6 tsim ib lub voj voog sib txawv, thiab nws txoj haujlwm yog: thaum lub pob S2 raug nias, theem qis dhau los ua qhov zoo thiab qhov tsis zoo ncov mem tes, thiab qhov tsis zoo ncov mem tes yog tau los ntawm VD1, ua rau lub flip-flop ntawm monostable flip. -flop. Cov theem siab ntawm qhov tso zis tso tawm monostable kav ntev li ntawm 1 ms, uas yog, tw≈1. 1R5C5≈1 ms. EN556 (U2n) tsim cov multivibrator, thiab oscillation zaus f1=1/T1≈1/{0.7[(R1 plus R2) plus 2(R3 plus R4)]C3≈40 kHz. Lub oscillator oscillation yog tswj los ntawm monoflop tso zis theem. Thaum lub monostable trigger outputs ib theem siab, lub multivibrator oscillates, thiab tus pin 5 ntawm EN556 outputs txog 40 rectangular pulses nrog ib zaus ntawm 40 kHz thiab lub luag hauj lwm voj voog ntawm txog 50 feem pua. Noj mus rau hauv tus account lub instability ntawm lub multivibrator pib-up theem, yog li tus naj npawb ntawm input m pulses yog tsim los kom ntau. Yog hais tias tus naj npawb ntawm cov zis pulses tsawg dhau, qhov emission siv yuav tsawg thiab qhov ntsuas qhov deb yuav luv. Txawm li cas los xij, tus naj npawb ntawm pulses ntau dhau lawm, thiab lub sijhawm sib kis tau ntev. Thaum qhov kev ncua deb ntawm cov khoom ntsuas yog qhov ze, lub tsheb ciav hlau pulse tsis tau kis, yog li cov ncha tsim los ntawm cov mem tes xa mus ua ntej yuav ncav cuag qhov kawg tau txais, uas yuav cuam tshuam rau qhov ntsuas qhov deb thiab ua rau ntsuas qhov deb. Qhov chaw tuag nce. U1a ~ U1e ntawm (U1) tsim ib qho ultrasonic pulse tsav Circuit Court, uas yuav ua rau kom lub amplitude ntawm lub mem tes voltage tsav lub ultrasonic xa sensor, zoo ua hluav taws xob / acoustic hloov dua siab tshiab, txhim khu lub peev xwm mus emit ultrasonic tsis, thiab nce qhov kev ncua deb. Ib txoj hauv kev ntawm 40 kHz mem tes tsheb ciav hlau yog inverted los ntawm U1a, thiab ces inverted los ntawm parallel inverter ntawm U1b thiab U1e; lwm txoj kev yog inverted los ntawm parallel inverter ntawm U1c thiab U1d.
