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  • DavidF15 commented on Naran's instructable Cheapest Smart Home for $382 weeks ago
    Cheapest Smart Home for $38

    Visually, the "RF sockets" look like Etekcity devices, available on amazon for $30 for a kit of 5 sockets and 2 handheld transmitters. Over at https://www.samkear.com/hardware/control-power-out... it says you can get a compatible 433MHz transmitter/receiver kit for about $5 ($6.66 SMAKN kit from Amazon). Amazon says the SMAKN thing is ASK/OOK modulation. There looks like a lot of meat on that other blog entry.

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  • DavidF15 commented on BR00KSM3T4L's instructable Sub Centimeter GPS With RTKLIB1 month ago
    Sub Centimeter GPS With RTKLIB

    The RTKLIB program `conv2bin rover.ubx` file can convert files into RINEX files: $ bin/convbin rover_20171211T165315.ubxinput file: rover_20171211T165315.ubx (u-blox)->rinex obs : rover_20171211T165315.obs->rinex nav : rover_20171211T165315.nav->rinex gnav: rover_20171211T165315.gnav->rinex hnav: rover_20171211T165315.hnav->rinex qnav: rover_20171211T165315.qnav->rinex lnav: rover_20171211T165315.lnav->rinex cnav: rover_20171211T165315.cnav->rinex inav: rover_20171211T165315.inav->sbas log: rover_20171211T165315.sbs2017/12/11 16:53:36-12/11 23:54:54: O=25279 N=50 G=102 H=75 L=88 S=13470$

    I've only got one ublox-M8T, and I was eventually able to get it to report some sub-centimeter scale positions referenced to a CORS station, but that was including averaging over a long, stationary time. I liked the http://rtkexplorer.com/ stuff for guidance. I eventually got it working under Wine on OSX, communicating with the M8t and finally getting fixes. The big tricks for me was using the updated 2.4.3 and rtkexplorer demo5 code which actually decoded the M8T messages, then figuring out how to turn on some monitors/logs (tiny box just above the RTKNAVI Start button) and see where it might be having problems.

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  • Arduino Bathroom Scale With 50 Kg Load Cells and HX711 Amplifier

    The coloring/configuration of the half-bridge cell wires if very important. They are different in several of your pictures. The wires on the cells pictured in step 2 (W-R-B) don't match the cells in the schematic (B-W-R). The wiring on the cells in the different panels of the step 1 pic differ from each other.If you don't drive and sense on the center taps of the half-bridges, the circuit would have half the sensitivity of https://arduino.stackexchange.com/a/18698/6628 configuration since your wheatstone bridge would exist between the cell's center terminals, and then be attenuated from each node of the wheatstone bridge into the HX711 by the variable resistance of the strain gauge.To make sure you get it right, be sure to figure out which two terminals on the load cells have the ...

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    The coloring/configuration of the half-bridge cell wires if very important. They are different in several of your pictures. The wires on the cells pictured in step 2 (W-R-B) don't match the cells in the schematic (B-W-R). The wiring on the cells in the different panels of the step 1 pic differ from each other.If you don't drive and sense on the center taps of the half-bridges, the circuit would have half the sensitivity of https://arduino.stackexchange.com/a/18698/6628 configuration since your wheatstone bridge would exist between the cell's center terminals, and then be attenuated from each node of the wheatstone bridge into the HX711 by the variable resistance of the strain gauge.To make sure you get it right, be sure to figure out which two terminals on the load cells have the highest resistance between them (E.g. Black and White, to match your schematic), wire them in a big color matching loop, like B-B W-W B-B W-W and then excite (E+/E-) two opposite center taps (R) and sense (A+/A-) on the other pair of center taps.

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  • Control WeMo Switch With Arduino+Ethernet Shield

    Grrr -- point your browser to the wemoipaddress:port/setup.xml file for its capabilities.

    Thanks,I found http://www.makermusings.com/2015/07/13/amazon-echo... as some info on the discovery and communication protocols used by the Wemo stuff. They use uPnP and SOAP. If you want to see what the switch advertises it can do, try http://www.makermusings.com/2015/07/13/amazon-echo...

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  • DavidF15 commented on Wood Yogi's instructable Marking Gauge for Woodworking7 months ago
    Marking Gauge for Woodworking

    Cool. I needed one of these just a couple days ago and I think I'll make this one. I think I'll probably file only the inner edge of the allen wrench, leaving the outer edge at 90 degrees, so I can set and mark flush to an external surface,

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  • DavidF15 commented on mikeasaurus's instructable 11 Unusual Uses for Coffee7 months ago
    11 Unusual Uses for Coffee

    Try some ground coffee as an ice cream topping. Yum!

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  • DavidF15 commented on timberanew's instructable Portable Benchtop Spring Pole Lathe8 months ago
    Portable Benchtop Spring Pole Lathe

    Awesome project. I was just thinking about a string pole late I saw in Branson Missouri about 35 years ago. I love the use of bungee elastic in lieu of the greenwood sapling.Maybe try a skinnier piece of scrap for the toolrest-crosspiece. The one in the pics looks too wide and would limit the ways you can vary to position and angles the chisels or gouges with respect to the workpiece.

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  • DavidF15 commented on carpespasm's instructable Make Your Own Geta Sandles1 year ago
    Make Your Own Geta Sandles

    The archived javascript didn't work for me, but they have a non-java set of percentages at https://web.archive.org/web/20080101130044/http://www.egeorgeonline.com/getapage/nojava.html (the javascript looks like it only does proportions anyway)

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  • Measure The Moisture Content Of Your Firewood With A Multimeter

    The Forest Service pub is at http://www.treesearch.fs.fed.us/pubs/9823 and the table is on page 4 (or between pages 3 & 4)

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  • DavidF15 commented on Kester1's instructable Arduino: CNC Machine / Part 21 year ago
    Arduino: CNC Machine / Part 2

    Looks like the bars would deflect about 0.003" per pound of force in the middle. How much does the belt stretch?

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  • The Best Dang Butterbeer Outside of Hogsmeade

    So, metric-wise, the drink is 2L cream soda, 75ml butterscotch syrup, and 5ml butter extract, plus a topping of 1L marshmallow fluff, 1L whipping cream, 15ml powdered sugar, and 18ml of rum extract.

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  • DavidF15 commented on Vulcaman's instructable Cherry- 60€ 3D-Printer1 year ago
    Cherry- 60€ 3D-Printer

    No, endstops are not necessary. You jog to the center of the board, set the nozzle to a paper-thickness above the board, and send a "G92 X0 Y0 Z0.01, you can set the coordinates just fine. If the printer is accurate, and the slicer is set to match the build area, you really don't need them.

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