PBP projects for R/C models

[mackrackit]

You may also want to look at the 16F886. Same chip as far as programming goes, less I/Os smaller foot print, 28 pins. Same data sheet as the 887.

The same outfit with the headers has a 400 hole bread board that can snap together with others if you need more room.
http://www.allelectronics.com/make-a...dboards/1.html

[Kenjones1935]

Here is a proto board that will carry all my parts and then some. Each board has two rows of 62 pairs of bussed 0.1" centers pin holes.

http://www.circuitspecialists.com/prod.itml/icOid/6888

I need 20 paired pins for the forty pin 16F887, 48 paired pins for the 6 sixteen pin DPDT relays, 7 paired pins for the fourteen pin SN7407, 6 isolated pins for the USB device and three isolated pins for the 5v regulator.

The board is 6 and 1/2 by 3 and 1/8 inches. That fits fine on my 1/10 scale hobby level SPRINT (the belt up the middle driving the front wheels is a problem that can be overcome) and my toy level 1.10 and 1.12 scale toy cars.

Is that a plan, or what?

Ken

[Kenjones1935]

New unexpected problem.

I have not been able to find socket headers that are compatible with the solderless proto board technology. All the headers are designed for PC use. This makes it very difficult to connect my six pin 0.1" centers USB connector device. It also makes it difficult to connect the servo PWM three pin cord, the Electronic Speed Control three pin cord, and the connectors needed for the radio receiver three pin male headers.

I could cut and strip six 1/2" #22 lengths of solid #22 gauge wire and stick then into consecutive holes. The female connector would come in perpendicular to the board.
This is not as reliable as 90 degree square header stock, but what choice do I have?
Remember this is for middle school students.

Suggestions anyone?

ken

[mackrackit]

Are you saying the breadboard you have is not 0.1 centers?
Up in post 311 I gave a link to a place with headers with 0.1 centers.

[Kenjones1935]

The 90 degree headers do not have long enough stems. They do not reach to the springs in the proto board holes. I solved this by bending them straight, but I would rather have the connectors coming in horizontal.

BIG REAL PROBLEM!! My PBP 2.6 version DEFINE pulsin_max
command does nothing. I can see this from the speed at which the sonar LED's blink. I am using a PULSIN command to detect whether the radio transmitter is powered on. If no PWM signal comes in, the power is off and the PIC is on its own to guide the car. This is my new TOGGLE system, but it does not work. When power is off the LED's flash about once per second no matter what I set pulsin_max to be. When power is on they flash many times per second.

Any rumors around campus to which I am not privy?

Ken

[Kenjones1935]

pulsin_max does not cut short the time used by PULSIN? It makes PULSIN ignore everything that happens after pulsin_max duration but the next command in line is not implemented until PULSIN has gone through all its 65,535 ticks.

If this is the case, what can I do to detect within, say, 25 millisec something that happens every 20 millisec or not at all?

Ken

[mackrackit]

I think COUNT might work better in this case...

Those 90 degree headers should be long enough when the plastic that holds them together is slide close to the bend. Works for me that way.