Look at the datasheet of the L293 chip. It can handle 4.5-36V, up to 1 amp per channel....
25625
Brian Dean
bsd512
Oct 4, 2005 6:19 pm
... Thanks, Doug! We just completed run #4 and we completed the course again, but we tagged the van along the back stretch. Had we been about 4 inches to the...
25626
barryschrag
Oct 4, 2005 6:27 pm
I currently have two seperate power sources on my robot, a small laptop computer containing Li cells, and the two main NiCd battery packs in series for the...
25627
Don French
french_don
Oct 4, 2005 7:58 pm
Finding suppiers of components other than electronic or common hardware is challenging. I am looking for someone who makes or sells jog dials but so far...
25628
Brian Dean
bsd512
Oct 4, 2005 8:13 pm
... Woops, my mistake. All the trials are running together - that was run #5 for us, not #4. So we have 3 solid completed runs on the NQE course. It's...
25629
Pete Miles
ajklz5
Oct 4, 2005 8:21 pm
Brian, I hope your team makes it. It is quite impressive to see what your team has accomplished so far. Pete ... From: "Brian Dean" <bsd@...> To:...
25630
Pete Miles
ajklz5
Oct 4, 2005 8:21 pm
What is a Jog Dial? Is is a mechanical Dial Indicator, used to measure machine position when manually jogging it around? Pete ... From: "Don French"...
25631
Bryan
bnhrobotics
Oct 4, 2005 10:13 pm
My encoder is from US Digital. It has 4000 counts per revolution. It is connected to a binary counted which is connected to the microcontroller. This way, the...
25632
PeterBalch
PeterBalch@...
Oct 4, 2005 10:32 pm
... I've tried both in the past and my experience is that piezo transducers aren't so good for low frequency vibrations. If you're going into mass production...
25633
George Lawrence Storm
keencoyote
Oct 4, 2005 10:35 pm
I am attempting to get my Mac Mini robot to do voice recognition. Currently I have a Blue Parrot B100 headset that links to the Mac Mini, however it appears it...
25634
Rob Purdy
gausswave
Oct 4, 2005 11:26 pm
The computer li packs I've replaced raided for cells etc. have a built in charging system in the pack it's self. I'd venture a guess when you're running the...
25635
Tom Capon
robot_mechan...
Oct 4, 2005 11:59 pm
I'm not sure Lithium-Ion batteries can do high current, but I know for a fact Lithium Polymers can go really high. As for in-circuit charging, you DO NOT want...
25636
paulpawelski
Oct 5, 2005 12:28 am
... If you have a parallel port available, you can do ISP on and AVR using the simple cable shown here: http://www.dontronics.com/dt006_programming.html All...
25637
paulpawelski
Oct 5, 2005 12:55 am
Solorbotics has some good small geared DC motors. Here is a link to one I use in small bots: ...
25638
Tom Capon
robot_mechan...
Oct 5, 2005 1:59 am
If I were to use only generic 741-type op-amps, would that simply mean i'd need 2 stages of amplification? What kind of gains are required to make this sensor...
25639
Kipton Moravec
kipton_moravec
Oct 5, 2005 3:07 am
... The MSP1007 has a weight which makes it more sensitive to lower frequencies. With an OP-AMP you can measure the smallest vibration. I was quite surprised...
25640
huip@...
handyboard2002
Oct 5, 2005 3:20 am
You can also check the AVR ISP ready made cable for reasonable price. http://www.robotstorehk.com/avr/avr.html ... From: paulpawelski ppawelski@... ...
25641
Kipton Moravec
kipton_moravec
Oct 5, 2005 3:53 am
I do not know if you are doing quadrature correctly. Some systems see jitter on one edge and declare it movement (counting up or down). You need to make sure...
25642
Jon Dugan
jdugan1024
Oct 5, 2005 5:15 am
Sparkfun has some as well (as well as lots of other nifty things): http://www.sparkfun.com/shop/index.php?shop=1&cat=4& They have a $11.95 serial programmer, I...
25643
Alan King
alantak69
Oct 5, 2005 6:07 am
... Surplus coil (relay, dot matrix print head, etc) and a NIB magnet on a flexible mount near the coil might be a little easier to deal with than a speaker,...
25644
Kipton Moravec
kipton_moravec
Oct 5, 2005 12:05 pm
I have not tried it with a 741 type op-amp. An op-amp with JFET inputs has higher input resistance which is what is recommended. The Piezo generates voltage,...
25645
Tom Capon
robot_mechan...
Oct 5, 2005 2:14 pm
Well, in terms of equipment, my main problem is that I can't move a washing machine into the lab. So I'm trying to buy myself a scope, which I've been meaning...
25646
Dave Hylands
dhylands_99
Oct 5, 2005 2:15 pm
Hi Don, ... If this is for a milling machine, then search for MPG or Manual Pulse Generator rather than jog dial. I picked up a Faunc one for $26 on eBay a...
25647
dan michaels
oric_dan
Oct 5, 2005 3:47 pm
... While it ... gain ... move ... Hey Kipton, have you ever tried gluing one of the MSP devices to a motor to see if you could use it as an RPM sensor? They...
25648
Randy Carter
randycarter2001
Oct 5, 2005 4:24 pm
Most jog dials are simple quadrature output rotary encoders like these from the Digi-Key catalog: http://dkc3.digikey.com/PDF/T053/1358.pdf The electronics of...
25649
Rich Chandler
mauser712
Oct 5, 2005 7:34 pm
... Just an FYI, the expression is "Run the gamut". And while I'm at it "Toe the line" not "Tow the line", and "For all intents and purposes" not "For all...
25650
Don French
french_don
Oct 5, 2005 8:49 pm
The thing I am looking for is for user input, like a thumb wheel that you can turn to make a selection. Here is a definition I found that pretty much...
25651
Rich Chandler
mauser712
Oct 5, 2005 9:06 pm
... I find that sometimes you can accidentally trigger a stonewall when you say "I want something LIKE X" when X is something exclusive, and they miss the ...
25652
The Earl
theear1
Oct 5, 2005 9:10 pm
So I found the car alarm that Circuit City installed for $600 on ebay for $50. In looking at it, it would not make a terrible robot brain. It already is...
25653
Ted Larson
ted_srf_dude
Oct 5, 2005 9:38 pm
Bryan, From your hardware description, and problem description of missing pulses, a timing issue is where I would be looking for the problem. Do you ever...
