PBP projects for R/C models

[Kenjones1935]

Last night I did a successful Compile and Program code for my 16F887 robocar. All looked OKAY. The new code loaded and the car ran. I slept fine.

This morning I added a couple more statements and compiled. Up came four Error[113] comments. So I commented out my changes and recompiled and would you believe Error[113]. The offending symbol is the command "WRITE". I have been WRITE'ng to EEPROM the values of some calculated thresholds for many weeks. This morning, one WRITE and I get the four Error[113\]. They say:
"Error[113] C:\pbp\pbppic14.lib 607: Symbol not previously defined (WRITE)"
each with a different line number.

What the...?

Ken

[Kenjones1935]

When I added the reserved word 'DIG' to each WRITE statement I inadvertently dropped the all important defining word 'WORD'.

What's that about old dogs and new tricks? Seems true after all.

KEn

[Kenjones1935]

It has been a while. Some local 'education' folks have taken an interest in my project. This is good.

Here is a new video. It amply demonstrates what happens when we cross the line from 'code inside a PIC' and the 'real world'. The third segment of the video shows that 'simple' threshold adjustment linear with speed adjustment is not enough. We also have control loop bandwidth issues. Looking closely at the behavior and knowing what I know now I think the intermittent problem was the 7.2 volt battery connection.

Interesting....

[thronborg]

Hello from Newbee!
I searched for Servo Tester and didnt find anything here so here is my problem. I really cant figure out the mathematics for this.
I made a servotester that output a puls from 0.5mS to 2.5mS (Its more than i need)
I have a pot that give an input of 0 to 255.

Q1: How do i get the Pot in one direction 0, to be 0.5mS and in the other direction 255 to be 2.5mS?

Q2: I have a similar problem with the Servo current sensor that give 2.5V at 0mA and 0,25V/mA.

Thanks in advance.

[ScaleRobotics]

I made a servotester that output a puls from 0.5mS to 2.5mS (Its more than i need)
I have a pot that give an input of 0 to 255.

Q1: How do i get the Pot in one direction 0, to be 0.5mS and in the other direction 255 to be 2.5mS?

That depends on your code for the servo tester. You will probably get more response if you either explain what you are doing, or post your code so far.

[Kenjones1935]

thronborg,

You might find the code examples in post #374 helpful. This dates back to August 2010 when I was first incorporating a pot into my system.

Ken

[thronborg]

Hello
Actually i have this code for display the value on a LCD. Now i want the value of 0 to be 1mS puls and 255 to be 2mS puls.

Se attached drawing.

' Name        : ServoTester.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : PIC16F690 or similar type compatible with LAB-X20 board
' Hardware    : LAB-X20 Experimenter Board
' Oscillator  : 4MHz external crystal
' Keywords    : ADCIN, LCDOUT
' Description : PICBASIC PRO program to read pot and display on LCD.
'                        FUNKAR ROR EJ

' Define LCD pins
Define LCD_DREG  PORTC   'LCD data port
Define LCD_DBIT  0       'LCD data starting bit 0 or 4
Define LCD_RSREG PORTC   'LCD register select port
Define LCD_RSBIT 4       'LCD register select bit
Define LCD_EREG  PORTC   'LCD enable port
Define LCD_EBIT  5        'LCD enable bit

' Allocate variables
x Var Byte

   ANSEL = %00000100    ' Set PORTA.2 analog, rest digital
   ANSELH = %00000000
   Pause 100            ' Wait for LCD to start

mainloop:
   Adcin 2, x           ' Read ADC value on AN2 (PORTA.2)
   Lcdout $fe, 1, "Pot1 = ", #x ' Send value to LCD
   Pause 50            ' Do it about 10 times a second
   Goto mainloop        ' Do it forever
   End[/I][/I]

Hope this help
Thronborg

Servo Tester.pdf