 | | How to add more IC lines?
|
|
Hi, all It appears that the proposed expansion board will not have any additional input capture functions. I've run out of Input Capture lines on the Handyboard, so does anyone have a suggestion on which processor could best be slaved to the (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: IR transmission
|
|
(...) Did you tried to remove the resistor? I actually simply fitted the IR diode in the female header. I found that the red diode beside the header would light less if the IR diode is emitting, since those two diode are installed in parallel. The (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: IR transmission
|
|
Also... For Tx I use a high power IR LED with about a 5-10ohm resistor (I can't remember exactly) Because the carrier is 50% duty and the signal is not continuous, this is ok. If you use a lower powered IR LED and/or a higher resistor, you may find (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: IR transmission
|
|
Jeff, You are right. Several things could be wrong here. First of all the precision resistor is VERY VERY important. This controls the frequency of the carrier signal. The freq is approx 1/(RC) where R = R4 and C = C6 of the the Handyboard IR Tx (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: DC10 turning
|
|
(...) A partial solution which I found is effective in turning a tracked platform on carpet, is to run the pivot tread in the same direction as the turn tread but at a much slower rate. This worked quite well with a Radio Shack Sherman Tank, but the (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | IR transmission
|
|
Well, in my quest for new and neat things to add to my robot, I've decided to start exploring IR transmission. I downloaded the REC80 routines, and have figured out that one of my TV/VCR/cable box remotes is compatable for the TV and VCR. It gives (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
RE: Attached processors... I have considered different ways of refining PWM speed controls on the HB, and have decided to try adding another 'HC11, and use the PWM code example in the Handbook. This seems easier (and smaller) than building it from (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: piggyback pentium/powerPC
|
|
(...) Or use the 32-bit Hitachi SH7032 microcontroller. An evaluation board sells for only $100 (I bought mine from Marshall Industries). It runs at 20MHZ, has 4GB address space, DRAM circuitry, 10-bit A/D, several timers, and I forgot what else. (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | piggyback pentium/powerPC
|
|
Already serveral ideas have been mentioned on processor upgrades. Instead of such a quantum jump, why not instead a small bunt. ie. Motorola has recently announced availability of the 68HC12. Although certainly not the screamers of a PowerPC, et.al. (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: DC10 turning
|
|
(...) That's how I've been doing it. I'm still having trouble turning. I partially solved the problem by applying some belt dressing (from my local Kragen auto parts store :-) to the treads, which helps some with the grinding I get from the drive (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Musings regarding Handyboard Expansion & Interfacing
|
|
More "musings":- ***...*** * MUSINGS ON THE SUBJECT OF HANDYBOARD INTERFACING * ***...*** * Generating Chip Selects and Address Signals * ***...*** These are my thoughts on (re)generating some needed signals on an expansion board to allow more (...) (28 years ago, 7-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | RE: DC10 turning
|
|
(...) A _long_ time ago, Dave Williams and I got into a discussion about tank treads and turning etc. I ran some experiments on a Radio Shack Sherman Tank toy I was using (the original "RoboTank" in my case) In a nutshell we proposed a mathematical (...) (28 years ago, 7-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: piggyback pentium/powerPC
|
|
(...) Pentium and low power can hardly be used in the same sentence. (...) If someone wants to design a piggyback 32 bit machine for the handy board, I will suggest the 68360. It is really powerful, and has all the glue logic in it for several megs (...) (28 years ago, 7-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | DC10 turning
|
|
Hi Jeff (...) I had the same problem. I got some improvement by running the treads in opposite directions. Turns real quick then! And the drive tread does not have to carry the whole force of the turn plus "slip" or pivot the stationary tread. Keith (...) (28 years ago, 7-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | piggyback pentium/powerPC
|
|
I realize that what I'm asking for is hardly cheap, but I'd like to piggyback some real computing power with the handy board. Can anyone suggest components for: - a small low-power pentium/powerPC with min 32MB RAM and a pair of serial (...) (28 years ago, 7-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Charging the battery
|
|
Make sure your adapter is 12v, 500 mA. If you have a voltmeter, measure the open-circuit voltage (when it's plugged into the wall, but not operating anything); you should get around 17 v. -F (...) (28 years ago, 7-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Glue/Caulk thread
|
|
GE's Silicone 2 is an amazing adhesive when you want to mount something firmly but might want to be able to peel it off and reposition it later without damaging the surface. Again, its flexible, cures overnight (for the most part) and doesn't have (...) (28 years ago, 7-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: Electronic Compass
|
|
(...) I was the one who had the Vector-2X working with the Miniboard not using the SPI bus. I won't try and talk you out of it, it may just work for you. Make sure you get the current documentation from Precision, the original docs I got from them (...) (28 years ago, 6-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Electronic Compass
|
|
OK, I finally got the prices for the KVH C100 and the Vector 2X electronic compasses, both referred to as low cost. The KVH is $700, the Vector 2X is $50. EASY decision, even though the Vector's accuracy isn't as good. It'll be here tomorrow. Now, (...) (28 years ago, 6-Aug-96, to lugnet.robotics.handyboard)
|
| |
| | Re: my bot
|
|
(...) I found the best way to mount micro switches is silicon bathtub caulk. It is flexible, and strong. (28 years ago, 6-Aug-96, to lugnet.robotics.handyboard)
|
