Model Train controller - revisited

[malc-c]

Hi,

I'm using the 16F676 - this is the code that I have (I think its the same as per the 1st post in this thread)

@ __CONFIG  _HS_OSC & _WDT_ON & _PWRTE_ON & _MCLRE_OFF 

DEFINE OSC 20

ANSEL = %00010111    			        ' Set which ports are digital and which are analogue
CMCON=7                                 ' Turm Comparitors off
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 (Hz)
DEFINE SPWM_RES   254               	' SPWM Resolution (0 - 255)

DutyVar VAR byte[4]                     ' Array used to store ADC [channels]

ASM
SPWM_LIST  macro                    	; Define Pin's to use for SPWM
    SPWM_PIN  PORTC, 2, _DutyVar        ; and the associated DutyCycle variables
    SPWM_PIN  PORTC, 3, _DutyVar+1      ; (Additional channels DutyVar+2, +3 etc)
  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]                    ; if having more channels add ADCIN 2, DUTYVAR[2] etc
 ADCIN 1, DUTYVAR[1]
GOTO Main                               ; program simply loops round reading ADC and sending corresponding PWM out

Compiles fine here

[malc-c]

Opps.. just noticed in the 1st post I have the wrong pic stated in the header of the code - Sorry !

[Acetronics2]

Hi, Malc

Sorry to sink your dreams ...

http://www.electroniquepratique.com/couve.php?id=43

The very bottom item ...

Alain

PS: its This Month issue !!!

[malc-c]

Don't you juts love bablefish !

Regulator for railway model making
Ci to be downloaded: 32 MODFERCI.zip

If it is a field where electronics contributes an interesting share, it is well in model making. To our readers amateurs of railway circuits, we propose the realization of this regulator intended for the piloting of the machines of traction.



Extract of L’article page 32 of the Practical number 316’D Electronic:

We deliberately chose an operation close to reality. The rise to power as well as deceleration are extremely progressive by the placement of fifteen stages visualized by two-tone leds. The inversion of the direction of walk can be carried out only one time the stopped convoy. Lastly, this control panel also comprises a button of emergency braking...

Oh well.... just goes to show how good my concept was...

[malc-c]

Well to finally put this one to bed, I've found that in the real world the practical aspect of using the PIC in this environment, is not without issues. The main problem has been with the reliability of the PIC. Whilst the control at slow speed can't really be beaten even with commercial controllers, the PIC often falls over and stops generating the PWM signals and requires the power to be disconnected and re-connected. I'm not sure what causes this, but would suspect that its something to do with the noise that model railways generate, or the back emf or something.

The concept was great, I've gained a lot of information and found some nice new usefull routines and had fun playing with these circuits and code

how's that saying go... back to the drawing board

[malc-c]

Hi, Malc

Sorry to sink your dreams ...

http://www.electroniquepratique.com/couve.php?id=43

The very bottom item ...

Alain

PS: its This Month issue !!!

Strange how the image is missing from that page, and the zip file gives a 404 error... maybe they have problems like I've experienced

[Acetronics2]

Hi, Malc

After this thread, I decided to make a single channel train controller ... for my sweet Daddy ( 85' y.o. in Sept. ... hé,hé !!! )

Drive will be in auto or semi-auto mode, with all whistles and bells ( w/ Brake, emergency, soft accel/decel ... etc, etc. ), so I need a 28 Pins chip for all indicators and pots !!!

a 16F87x @ 4 Mhz or less will perfectly do the job ...

I'll ring you when ready ...

Alain