PBP projects for R/C models

[Kenjones1935]

I do write SONAR proximity results in EEPROM. I use the WRITE command. It comes out in HEX with reversed words. Here is an example:

Address 00 contains BC
Address 01 contains 02
This reads as BC 02 when looking at the EEPROM readout.

These are HEX and they are reversed. They represent:
$02BC = 256x2 +16x11 + 12 = 512 + 176 + 12 = 700decimal

Take 2/3 of 700 and get about 48 inches. I do that with in my head or with scratch paper.

Your system of dividing 700 by 14.8 gets 47.29 inches. My brain can figure out "two thirds of" easier.

I want addresses 00 and 01 to look like 4729, or preferably rounded down to 0047 or up to 0048. Can PBP do that?

Ken

[ScaleRobotics]

I want addresses 00 and 01 to look like 4729, or preferably rounded down to 0047 or up to 0048.

This will write asci to your eeprom data. Your PicKit2 can be set to read data as asci with the little drop down box. By the way, I hope you are not writing to the eeprom each time a distance is measured, because you will wear your chip out pretty quick that way.

distance var word
inches var byte
distance = 700
distance = distance * 10
distance = distance + 74        'add half of divisor (148) , this is not  needed, but will "round up" if you want to be a little more accurate
inches = distance / 148


write 0,61                      'For "=" (standard asci character set)
                                'the + 48 changes it from dec to asci
write 1, inches dig 2 + 48      'will be a "0" if inches = 47
write 2, inches dig 1 + 48      'will be a "4" if inches = 47 
write 3, inches dig 0 + 48      'will be a "7" if inches = 47

Then you can view it like this:

[Kenjones1935]

Today I brought both of my PIC controlled cars to the old gym to see how they fared together on the same track. Here's the video. Which do you think was the winner? Remember the TOY car is red. The MODEL car is blue. The TOY cost originally cost $50. The MODEL cost $200. Both have my kit.



What do you think? Should I show it on Access Television?

Ken

[mackrackit]

They look pretty much equal to me.
What if you took some paste board and made the corners a radius?

Overall they look good!!

[Kenjones1935]

I have a new plan to control the much faster 1/10 scale toy car which is fast, but does not contain proportional controls. The trick is to turn the wheels only for a short period of time (150 msec at the moment) then 'kick' (supplement the springs) them back to neutral.

If the neutral is well calibrated (the 1/10 cars have a knob that centers the wheels) this method makes the car turn with little swerve. I need this while wall following. Otherwise the car crashes into the wall before the code/DPDT relay/steering wheels can react.

I'll make a video if this really works.

Ken

[cncmachineguy]

Great Idea Ken

[mackrackit]

Worked for me

Originally Posted by mackrackit :
I just drove home trying to simulate Ken's car. Pulsed the same degrees left or right, more pulses left or right for turns but always the same, say 5 degrees off center, and after each pulse returned to center.