Recommendations - Model Train Controller

[mister_e]

Malc,
it's little bit more than rem ADCIN line. i'll place all the changes i made in RED

@	__CONFIG  _HS_OSC & _WDT_ON & _PWRTE_ON & _MCLRE_OFF 


	ANSEL = %00010111    			; - dt suggested value



	DEFINE OSC 20
	CMCON=7
	TRISA=%11111111        			'set PORTA as all input 
	TRISC=%00000001        			'set PORTC as all output apart from RC0

	DEFINE ADC_BITS  8     			' ADCIN resolution  (Bits)
	DEFINE ADC_CLOCK 2     			' ADC clock source  (Fosc/32)
	DEFINE ADC_SAMPLEUS 11 			' ADC sampling time (uSec)

	INCLUDE "DT_INTS-14.bas"            	; Base Interrupt System
	INCLUDE "SPWM_INT.bas"              	; Software PWM module

	DEFINE SPWM_FREQ  150                	; SPWM Frequency
	DEFINE SPWM_RES   255               	; SPWM Resolution

	DutyVar VAR byte[4]

ASM
SPWM_LIST  macro                    	        ; Define Pin's to use for SPWM
    SPWM_PIN  PORTC, 2, _DutyVar                ; and the associated DutyCycle variables
    SPWM_PIN  PORTC, 5, _DutyVar+1              ; Notice the underscore before variables
    SPWM_PIN  PORTC, 4, _DutyVar+2
    SPWM_PIN  PORTC, 3, _DutyVar+3
  endm
  SPWM_INIT  SPWM_LIST                  	; Initialize the Pins
ENDASM

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,  SPWMhandler,  ASM,  yes
    endm
    INT_CREATE                      	        ; Creates the interrupt processor
ENDASM

@ 	INT_ENABLE  TMR1_INT              	; enable Timer 1 interrupts

	;_____________________________________________________________________________

Main:                               
 	ADCIN 0, DUTYVAR[0]
 	ADCIN 1, DUTYVAR[1]
	ADCIN 2, DUTYVAR[2]
 	ADCIN 4, DUTYVAR[3] 
 
	GOTO Main

Now for the noise, to me, as i'm not a motor pro, there's something normal in that. Your motor have a comfort zone in which he can operate. So if you're under that (let's call it threshold, lower possible voltage or else), for sure he will yell. It has to fight the inertia.. (OK OK probably not the right term... but it's how i understand )

Now, is this louder using PWM or not? this is why i asked for a variable supply before.

If it's better, we could still redesign the whole thing... same thing if you find a PWM frequency which reduce the noise.

Time for few tests on your side... even if you use few battery in serie