#robotics Logs

Oct 06 2014

00:29 mrdata ok how
00:30 mrdata resistor network?
00:31 rue_house tie the rows to +5 with the following resistors r1:0R r2:400R r3:800R r4:1200R then put the columsn togethor witht eh following resistors c1:100R c2:200R c3:300R c4:400R, take the non-keyborad end of that and tie them togethor, put a 1k resistor to ground from there
00:31 rue_house measure the voltage at the top of that 1k resistor
00:31 rue_house a count of more than 10 means you have a key
00:31 rue_house from there, there are atleast 15 adc units between the keys
00:32 mrdata mhm
00:32 mrdata good job
00:32 rue_house R 0:C 0, 4.545455, (929.999991)
00:32 rue_house delta -4.545455V (-929.999991)
00:32 rue_house R 0:C 1, 4.166667, (852.500065)
00:32 rue_house delta 0.378788V (77.499926)
00:32 rue_house R 0:C 2, 3.846154, (786.923054)
00:32 rue_house delta 0.320513V (65.577011)
00:32 rue_house R 0:C 3, 3.571429, (730.714279)
00:32 rue_house delta 0.274725V (56.208776)
00:32 rue_house R 1:C 0, 3.333333, (682.000033)
00:32 rue_house delta 0.238095V (48.714246)
00:32 rue_house R 1:C 1, 3.125000, (639.375000)
00:32 rue_house delta 0.208333V (42.625033)
00:32 rue_house R 1:C 2, 2.941176, (601.764694)
00:32 rue_house delta 0.183824V (37.610306)
00:32 rue_house R 1:C 3, 2.777778, (568.333360)
00:32 rue_house delta 0.163399V (33.431334)
00:33 rue_house R 2:C 0, 2.631579, (538.421096)
00:33 rue_house delta 0.146199V (29.912264)
00:33 rue_house R 2:C 1, 2.500000, (511.500000)
00:33 rue_house delta 0.131579V (26.921096)
00:33 rue_house R 2:C 2, 2.380952, (487.142852)
00:33 rue_house delta 0.119048V (24.357148)
00:33 rue_house R 2:C 3, 2.272727, (464.999996)
00:33 rue_house delta 0.108225V (22.142857)
00:33 rue_house R 3:C 0, 2.173913, (444.782600)
00:33 rue_house delta 0.098814V (20.217395)
00:33 rue_house R 3:C 1, 2.083333, (426.250033)
00:33 rue_house delta 0.090580V (18.532568)
00:33 rue_house R 3:C 2, 2.000000, (409.200000)
00:33 rue_house delta 0.083333V (17.050033)
00:33 rue_house R 3:C 3, 1.923077, (393.461527)
00:33 rue_house delta 0.076923V (15.738473)
00:33 rue_house R = row C = column volts (adc units)
00:33 mrdata yep
00:34 mrdata how little tolerance do those Rs require?
00:34 rue_house should be ok if your keyboard connects with less than maybe 50 ohms
00:34 rue_house :D they need to be .0001% resistors
00:37 rue_house http://ideone.com/FjykF9
00:39 rue_house helps if the delta line is in the right place, whatever
00:41 rue_house whats 40 ohms error over 1200 ohms
00:41 rue_house 3%?
00:42 rue_house maybe if I'm interested I'll rewrite the program to hit 16 particular voltage
00:42 rue_house s
00:42 rue_house the idea works, thats what I was interested in
00:45 rue_bed-aok my last idea before that used 4 adc channels
00:45 rue_bed-aok one for each column
19:16 rue_house Tom_itx, I got those converters
19:16 rue_house I see what they did
19:16 rue_house they have two sata connectors,
19:16 rue_house one is for when using sata -> ide hd the other for ide ->sata hd
19:25 Tom_itx i got one of em today
19:25 Tom_itx 3 to usb
19:26 Tom_itx the 2.5 pata is useless though
19:26 Tom_itx can't power it unless you put an adapter on it which turns it into a .1 spacing one
22:12 rue_house why did you get to usb if you didn't want them to go to usb?
22:21 rue_house the usb ones are only meant to go between the usb and the drive (in one of the two connectors)
22:36 anonnumberanon msp430 vs STM32 F4 discovery vs Ardupilot to make a very capable quadcopter?
22:50 rue_house Tom_itx, you didn't buy the usb converter to ADAPT the drive connectors did you?instead of just buying the $1 drive adapter?
23:15 rue_house Tom_itx, http://www.ebay.ca/itm/QZO-IDE-3-5-to-2-5-Laptop-Hard-Disk-Drive-Adapter-Convertor-Card-Power-Cable-/151209282826
23:15 rue_house helps if I PASTE the link