Microprocessor light-emitting diode tachometer of AZLK
Replacement to a regular tachometer, displays a being shone column from 80 light-emitting diodes
Displays a being shone column on a scale of light-emitting diodes, the Description of all dashboard in which the tachometer described below is established works from KSZ on BONDS, to look in article the AZLK Dashboard .
The circuit works with contact system of ignition on BONDS. Whether will correctly work with other engines, I can not promise.
The matter is that in an entrance chain there are no special elements for elimination of a tinkling sound of contacts, the tinkling sound is filtered programmno. The program considers that passed the forward front of an impulse if the high signal on an entrance keeps not less set time. This delay stole up a method scientific тыка. At reduction of a delay of the indication become overestimated because of calculation of fronts from a tinkling sound, at increase in a delay on big frequency there are admissions in calculation of regular impulses.
As a result the program which steadily works turned out and gives the evidences coinciding with indications of a tachometer from a priborka of RAR in дипазоне of 500-5500 rpm. But there is no guarantee that this circuit will work with other engines, or with other type of system of ignition since to prove the chosen size of a delay I cannot than, except the carried-out tests.
Light-emitting diodes are connected to exits of Out1-Out15 of type "an open collector". It allowed запитать diodes from 12В with consecutive inclusion on 4 diodes. Chips of MBI equalize a current (and thus brightness of a luminescence) at consecutive inclusion of several light-emitting diodes in an incomplete chain. Such inclusion also reduces a consumed current.
The tachometer is connected to standard conclusions of a plait of conducting for connection of a regular tachometer.
Range of measurement of 0-8000 rpm with a step of 100 rpm.
It is possible to copy the text between lines - in a text editor, NOTEPAD will approach, and to save the file with the HEX expansion. Such file can be used for a microprocessor insertion.
------------------- :020000040000FA :10000000850186018B018101640083160030850023 :1000100001308600C730810083125F2014308D00CC :1000200058208D0B1028542010308D000B1D1628E1 :100030000B118D0B16285F20542020203A201D28FC :100040008C0120308E0005308D008B101630810021 :100050000B118B1C3328061C30288E0B33288C0A7E :100060008B1020308E000B1D29288D0B26288C0C20 :100070008C1308005F200C080339013E8D008615A3 :100080004328502086118D0B41288C0C8C138C0C2E :100090008C138C0A4C2858208C0B4B2854200800B9 :1000A00006150000061108008614000086100800DE :1000B00086155020861150205020502008008611AF :0C00C00050308D0050208D0B622808008D :02400E00F13F80 :00000001FF -----------------------
Further the initial text of the program for those who can and will conceive something to correct.
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; tachometer list p=16F84A #include __ config _CP_OFF & _WDT_OFF & _PWRTE_ON & _XT_OSC ; Constants bitSDI equ 3 bitCLK equ 2 bitLAT equ 1 iniRPT equ 5 iniTMR equ d '022'; d '100' iniDBL equ d '032' ; Variables cntIMP equ 0x0C ; counter of impulses cntRPT equ 0x0D ; counter of repetitions cntDBL equ 0x0E; counter of time of a tinkling sound of contacts ; program org 0x000 clrf PORTA clrf PORTB clrf INTCON clrf TMR0 clrWDT bsf STATUS, RP0 movlw b'00000000'; all bits of RA on a conclusion movwf PORTA movlw b '00000001'; RB0 on input, other bits of port on a conclusion movwf PORTB ; we switch off tightening resistors, movlw b '11000111' ; TMR0 on an internal step with a predivider 256 movwf ; interruptions are forbidden OPTION_REG, we will check tags bcf STATUS, RP0 ; prologue ; to include all scale call SendCLR movlw d '20' movwf cntRPT loopPRE1 call SendQRT decfsz cntRPT, f goto loopPRE1 call SendLAT ; to wait 1 with = for 16 tics (1 tic = 64К microsec = 65 ms) movlw d '16' movwf cntRPT loopPRE2 btfss INTCON, T0IF goto loopPRE2 bcf INTCON, T0IF decfsz cntRPT, f goto loopPRE2 ; to switch off call SendCLR call SendLAT ; global cycle Main_loop call COUNT_IMP call SHOW_COUNT goto Main_loop COUNT_IMP; measurement phase clrf cntIMP ; we null the through counter movlw iniDBL movwf cntDBL; we initialize the counter of blocking of a tinkling sound movlw iniRPT movwf cntRPT; cycle of calculation of impulses ; (5 times counting by the timer on 60мс) bcf INTCON, INTF ms300 movlw iniTMR; at 4Мгц and a predivider 1:256 ; 1 tic of the timer of 256 microsec turns out movwf TMR0; TMR0 should count from 22 ; to 256 during 59,904 ms bcf INTCON, T0IF ms60 btfss INTCON, INTF; if there was a front of an impulse of the sensor, ; that we go on processing of counters goto NoINCR ; the sensor is silent, we go to check the timer DoINCR btfss PORTB, 0 goto ClrINT; if RB0=0, we dump interruption ; if RB0=1, decfsz cntDBL, f; we detain further actions goto NoINCR; before zeroing of the counter of a tinkling sound ; the delay for the period of a tinkling sound ended incf cntIMP, f; +1 in a schechik of impulses ClrINT bcf INTCON, INTF; dumped a flag of external interruption movlw iniDBL movwf cntDBL; we initialize the counter of blocking of a tinkling sound NoINCR btfss INTCON, T0IF; we repeat a small cycle, goto ms60 ; while TMR0 will not tell: will suffice! decfsz cntRPT, f; counted 60 ms, it is necessary to repeat 5 times, goto ms300 ; that an interval of counting turned out 0,3 seconds ; counted 300 ms rrf cntIMP, f; we halve the counted number of impulses bcf cntIMP, 7 return SHOW_COUNT; phase of indication of results of measurement ; занулить indicator bits call SendCLR ; conclusion of a nepony quartet of a scale movfw cntIMP andlw 3; a remainder of division on 4 addlw 1; +1 movwf cntRPT; in a schechik of repetitions bsf PORTB, bitSDI goto loopMOD+2; to enter into a cycle from counter check loopMOD call SendCLK bcf PORTB, bitSDI decfsz cntRPT, f goto loopMOD ; conclusion of full quartets of a scale rrf cntIMP, f bcf cntIMP, 7 rrf cntIMP, f bcf cntIMP, 7; integer division ; on 4 counters of impulses incf cntIMP, f; gives number of full quartets of a scale goto loopDIV+1; to enter into a cycle from counter check loopDIV call SendQRT decfsz cntIMP, f goto loopDIV ; switching on indication of new measurement call SendLAT return ; subprogrammes SendCLK; formation of a clock impulse of CLOCK bsf PORTB, bitCLK nop bcf PORTB, bitCLK return SendLAT; conclusion of an impulse of a latch of LATCH bsf PORTB, bitLAT nop bcf PORTB, bitLAT return SendQRT; conclusion of a full quartet bsf PORTB, bitSDI; for each full quartet we deduce 1000 call SendCLK bcf PORTB, bitSDI call SendCLK call SendCLK call SendCLK return SendCLR; to clear a scale bcf PORTB, bitSDI movlw d '80' movwf cntRPT loopCLR call SendCLK decfsz cntRPT, f goto loopCLR return end