PBP projects for R/C models

[Kenjones1935]

Channel 2 is PULSOUT.
Channel 3 is the corresponding PULSIN.

PULSOUT is waaayyy to long. It is supposed to be 20 microseconds since I am using the 4meg oscillator and my command is

PULSOUT trigfront 2

PULSOUT is about 14 millisec according to the LOGIC TOOL. See picture. Oops. The forum won't honor my request to upload the picture. You'll have to take my word for it.

Any ideas?

[Kenjones1935]

I chose, by flipping a coin, to have my PULSIN inputs on pins PORTB.2 and PORTB.3.

Is it possible that these pins can not accept pulses for width measurement? I read a two year old posting that seemed to say by changing his PULSIN pins from PORTA to PORTC everything suddenly worked. He was having the same problem as I. The pulse is on the pin, but the PIC does not act upon it.

KEn

[Archangel]

Hi Ken, Are you still using 16F887. If so PortB is lousy with analog functions, just waiting to be disabled.

[Kenjones1935]

Joe,

Are you saying that all I need to do to use PORTB is figure out how to appropriately configure it?

If so, please give me a hint? I am soooo close.

Ken

[Archangel]

Joe,

Are you saying that all I need to do to use PORTB is figure out how to appropriately configure it?

If so, please give me a hint? I am soooo close.

Ken

Ken,
I am not an expert on pulseout or pulsein, and I have not read the manual lately, but I believe they are digital commands, which by default should require you to disable the analog functions on the pin you are using.
On this chip you have,
ADCON0
ADCON1
ANSEL
ANSELH
CMCON0
CCP1CON
CCP2CON
CM1CON0
CM2CON0
CM2CON1 and a couple more which all have effect on the I/O. Get into the data sheet and read about them, they are all listed in the index of the data sheet, and see how to set them up. Remember if a bit is SET it is a 1 if cleared it is a 0.
When you come out of the data sheet you will be a much more "Savy" programmer.

[Kenjones1935]

My problem was that the length of the PULSOUT pulse was way toooo long. This was true even if I did a PULSOUT trigfront, 1.

So I changed it to:

HIGH trigfront
PAUSE 1
LOW trigfront.

It seems to respond correctly on its blocks with me moving a oak cutting board in front and on the right side to simulate inside a room with no furniture.

The battery needs charging and I need to neaten up the bundle of wires. I feel a video might not be long in coming.

Thanks, gang. Whomever you are.

Ken

[Kenjones1935]

I've got the car driving around using HPWM to control the electronic speed control and the steering servo. This is a high quality hobby level car. It seems to not react quickly enough to the PIC commands. It was designed to have a person at the radio transmitter controlling with finger and wrist movements while watching how the car performs. This is a beautiful mechanism when human judgment is included.

A toy level car runs the wheels with direct current. The steering is a bang bang servo with a mechanical mechanism forcing it straight. Fritzl used a toy level car in his wall racer. http://letsmakerobots.com/node/696

I have added 'kickers' to the steering commands. Realizing that steering straight is the servo's action when given no current, I figured that transitioning from hard left or hard right to straight might be faster if the go straight HPWM command were preceded by a momentary hard shot to the opposite extreme. My first experiment did little to improve response.

Of course it might be that my car needs a grease job.

Hmmm....

Ken