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Re: PIC16F877 PWM用熱敏電阻控制讓馬達乘4倍
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新會員
 
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是的，謝謝你用心看我的問題
發表於: 2008/1/14 22:28
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Re: PIC16F877 PWM用熱敏電阻控制讓馬達乘4倍
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新會員
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Hi..
你寫的主旨有點奇怪..不太懂你所要表達的意思 是指利用熱敏電阻所造成的電壓變化..經由pic內建的ad讀入類比電壓..經過計算將原先pwm的開度..增加到原來的4倍..並輸出至放大電路..推動馬達...是這樣嗎..
發表於: 2008/1/14 12:38
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PIC16F877 PWM用熱敏電阻控制讓馬達乘4倍
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新會員
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請問各位先進
我要如何用熱敏控制馬達讓它乘4倍，並且LCD最高顯示到255，以下是我的程式碼，我該如何修改，謝謝 8 BITS A/D(VR) + LCD + PWM ; LIST P=16F877, R=DEC #INCLUDE P16F877.INC CBLOCK 0X20 ENDC ; ; DEFINE RAM ; CBLOCK BCDBFH, BCDBFL ENDC ; ORG 0 NOP GOTO MAIN ; ; ;---------------------------------------------------------------; ; #INCLUDE <LCD.INC> ; ; ; Defines for I/O ports that provide LCD data & control ; ; LCD_DATA equ PORTB ; LCD_CNTL equ PORTB ; ; RS equ 5 ; RS=PORTB,5 ; E equ 4 ; ; ;===============================================================; ; #INCLUDE <HX2BCD.INC> #include <DLY2_5mS.INC> ; ;................................. ; MAIN: call InitLCD call clrLCD ; ;************************************************ ;* - Initialize the A/D converter * ;* - Left justified * ;* - 1 analog channels, 0 references * ;* - Fosc/8 clock source * ;* - Channel 0 * ;* - Enable A/D * ;************************************************ ; BANKSEL ADCON1 ; ADCON1 is in bank1 MOVLW B'00000100' ; select left(0) justified (d7) ; 1 ch(AN0)/0 refs MOVWF ADCON1 ; BANKSEL ADCON0 MOVLW B'10001001' ; select Fosc/8(01), AN0(000) MOVWF ADCON0 ; a/d done(0), x(0), a/d ON(1) ; ;************************************************ ;* - Initialize the CCP1 Module * ;* - Set the period to FFh * ;* - Make RC2 an output * ;* - Configure CCP1 for PWM (xxxx11xx) * ;* - Initialize Timer2 * ;* - 1:1 Postscale (x0000xxx) * ;* - 1:4 Prescale (xxxxxx01) * ;* - Enable the timer (xxxxx1xx) * ;************************************************ BANKSEL PR2 MOVLW H'FF' MOVWF PR2 BCF TRISC,2 BANKSEL CCP1CON MOVLW B'00001111' MOVWF CCP1CON MOVLW B'00000101' MOVWF T2CON CALL DLY2_5mS ; wait for input charge MAIN1: BSF ADCON0,GO ; start a/d converting MAIN2: BTFSC ADCON0,GO ; a/d convertion finished? GOTO MAIN2 ; no ; call L2homeLCD MOVF ADRESH,W ; read a/d result ( high byte ) CALL HX2BCD ; convert HEX to BCD ; results in BCDBFH/BCDBFL ; MOVF BCDBFH,W ; output a/d results to LCD CALL putHexLCD ; MOVF BCDBFL,W ADDLW .100 CALL putHexLCD ; MOVF ADRESH,W MOVWF CCPR1L ; Also in Duty cycle ; GOTO MAIN1 ; ; ; END
發表於: 2008/1/12 19:57
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