#robotics Logs

Dec 30 2012

03:03 Triffid_Hunter spagetti: 2v at 15mA? use an lm317
03:04 Triffid_Hunter oh 200mA stalled, lm317 still handle it no worries although if you plan on loading it, a buck switcher will help with battery life
03:08 spagetti triffid_hunter great thanks
03:15 spagetti triffid_hunter what size resistor do i use
03:16 Triffid_Hunter spagetti: for what? the feedback on the lm317? whatever you have lying around
03:16 spagetti do i need a cap
03:16 Triffid_Hunter lm317 datasheet should tell you that
03:19 spagetti hm
03:19 spagetti im measuring the output voltage
03:19 spagetti it starts at 4 but starts dropping down
03:24 spagetti hm
03:24 spagetti the voltage regulator also regulates current?
11:53 spagetti http://www.eminebea.com/content/html/en/dc_list/pdf/mdn3.pdf hi can someone tell me what numbers i should be looking for here
11:53 spagetti for the current
11:53 spagetti it says rated load current 71ma but starting current 166ma ...i'm not sure what that means
14:24 rue_house cant, your gone
14:39 DagoRed :(
14:48 home rue_house: well
14:48 home I got the robot little thing working :/
14:52 rue_house cool, lets see!
18:28 KimLaroux Plastic bushing... whoever invented them needs to get shot in the knee
18:29 rue_shop3 :)
18:29 Tom_itx it's called job security
18:29 Tom_itx programmed to fail
18:29 KimLaroux eh
18:30 KimLaroux I just disassembled the rear derailleur of my bike, and both rollers are plastic on plastic
18:30 KimLaroux Needless to say, both surfaces are now scrap
18:30 KimLaroux the bike is only a year old
18:30 Tom_itx rue can turn you some new ones
18:31 KimLaroux My old bike, which cost a fraction of this one, has ball bearings in the rollers... and they outlast the life of the bike frame
18:31 KimLaroux eh
18:32 KimLaroux capitalism will never fail to disgust me
18:34 KimLaroux Plastic on metal would have been ok... but plastic on plastic?!?
21:54 rue_house brass and stainless maybe?
21:54 rue_house I have to find some wire for a power run to the back of the truck
21:54 rue_house mm, #10 or so...
22:00 Tom_itx rue_house, what you workin on?
22:14 rue_shop3 tov
22:14 rue_shop3 rov even
22:14 rue_shop3 Tom_itx, whats outsourcing pcb's costing you /1"^2
22:14 rue_shop3 approx
22:14 rue_shop3 new board
22:24 Tom_itx $5
22:24 Tom_itx x3
22:26 Tom_itx http://oshpark.com/
22:27 Tom_itx if you want more than a prototype talk to capnkernel in avr
22:27 Tom_itx china sourced
22:30 Tom_itx https://docs.google.com/document/d/1p6FH25ltGpzJQ5_8fbflDukqEKghiEcpuhJpngth2Is/edit?pli=1
22:32 gluetron hi
22:33 ace4016 hi
22:33 tobbor hi ace4016.
22:36 gluetron hi
22:37 gluetron got some cookoo algorithms for self reinforcement, invariance and motor output
22:37 rue_shop3 ok, locked rotor is 1.3A, so a 9A fet is ok
22:37 rue_shop3 Tom_itx, $5 for 3"^2
22:38 Tom_itx you said 1 sq in
22:38 rue_shop3 yea
22:38 Tom_itx it's $5 /sq in
22:38 rue_shop3 you said x3
22:38 Tom_itx but you get 3 back
22:38 rue_shop3 ok
22:38 rue_shop3 so its $5 for 3"^2
22:38 Tom_itx of the same board
22:38 rue_shop3 I dont want to make a 1" board, I want to get an idea of the rate
22:38 Tom_itx $5/sq in
22:39 rue_shop3 k
22:39 Tom_itx or talk to capnkernel for his china price
22:39 gluetron Where does math and incorrect thinking cross in this riddle? I study math and neurological loops of confusion and nobody has a clear answer to this- 3 men pay for a hotel room for one night. The total cost for all 3 was $30 which means each man paid $10. After the 3 men had gone to the room, the clerk at the front desk realized he had overcharged them $5. He sent the bellhop to return the money but only had one dollar bills. To k
22:39 gluetron bellhop decided to give each man $1 and keep the other two dollars as a tip. If each man had paid $9 and the bellhop kept $2, where did the other dollar go?
22:39 rue_shop3 that would put my avr boards at $40/ea
22:40 Tom_itx how big are they?
22:40 gluetron oops sorry...
22:40 Tom_itx and how many do you want?
22:41 rue_shop3 I was thinking a batch, cause I made generic serial controller software for them and now I want ot use them for io control everywehre
22:41 Tom_itx so 5 min
22:41 Tom_itx capn can probably get you a better deal
22:41 rue_shop3 their 8"^2 of so
22:41 Tom_itx make em smaller
22:41 Tom_itx i know you can
22:42 Tom_itx and i haven't even seen em
22:42 rue_shop3 their almost like yours, but mine keep to a connectors standard a bit more
22:42 rue_shop3 babyboard III
22:43 Tom_itx you stuck on the 40 dip?
22:43 rue_shop3 I have 6 commerially etched ones that I got done in vancouver
22:43 rue_shop3 yup
22:43 Tom_itx what did they cost you?
22:43 rue_shop3 the idea is to be able to replace when you burn out io lines
22:43 rue_shop3 I dont remember, but it dosn't matter, I was pushing them with a bunch of stuff I was making for a guy
22:43 Tom_itx everyone is getting used to doing smt nowdays
22:44 rue_shop3 forgetting hwo to drill holes?
22:45 rue_shop3 I thought i etched myself a bunch of fuse boards, cant find em
22:46 Tom_itx turn the shop upside down
22:46 Tom_itx they'll fall out
22:46 rue_shop3 :)
22:46 rue_shop3 I can see it but not quite work out where it is