PBP projects for R/C models

[Kenjones1935]

22 gauge will be snug and if you do your breadboarding like Darrel does it all should stay put.
http://www.picbasic.co.uk/forum/atta...2&d=1278267329

My 16F887 is attached to a Microchip PC board. It is the PICkit #2. My problem is getting ten signal wires off that board an onto a solderless proto board like Darrel used. Are you all suggesting that I do the whole job on a solderless board? If I were to do that, where do I get the solderless header that fits my Microchip provided USB connector? I'm pretty sure my 44 pin square shaped PIC will not fit. I need the long rectangle shape.

Ken

[mackrackit]

I use these with bread boards and the PicKit2
http://www.allelectronics.com/make-a...-ANGLE//1.html

The long rectangular chips are what they call a PDIP package. Much easier to solder when you get to that point.

I would develop the project on a bread board with PDIPs and that might be the way to go with the kit also. It would low the students to experiment...

[Kenjones1935]

Looks like all I need to connect to a PDIP 16F887 on a solderless board are the six wires from the USB device and two .1uf caps between Vcc and Gnd. The rest of the Microchip PICkit 2 schematic I do not use. (Some LED's would be nice.) Don't forget two isolated batteries. One for the DC motors the other for the logic.

This is little considering the six Zettler relays, the SN7407, and a 5v regulator. Hmmmm

Does this seem correct to you?

Ken

[Kenjones1935]

Power, Ground, Trigger and Echo to/from three sonars. Interconnections with the radio receiver and the wires that go to the DC motors and/or the Electronic Speed Control.

If this could all be on one board and the board could fit inside a little car.....

Ken

[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

[ScaleRobotics]

Glad to hear it. The bad news is that HPWM doesn't go down as low as 50 hertz, unless you use a really low osc speed. You have to go down to 0.5 mhz to get there. And, unfortunately you have to tell pbp that it is running at 4mhz. This will make a pause 2000 16 seconds. It can be compensated for, but a bit of a pain. And it limits you to 32 steps of speed. I think I talked about this back on post 199. Maybe that's why you tried to go back to PWM. But as you saw, PWM is effected by blocking commands, like pause.

http://www.picbasic.co.uk/forum/show...5908#post85908

I don't have a 16F887, but I just ordered a sample, so I can help test some options for you.

Walter