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Type: Posts; User: ohararp

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    Re: Water level detection (again)

    Tim, I know you solved this but this was pretty interesting to me...http://www.adafruit.com/products/2656
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    Re: Need to hire a maths student (Please :) )

    Email Sent.
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    Re: Inventory check in/out

    What about some of the BLE tags? You could even use these to find radios that have gone astray?
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    Re: Power Supply Design

    I have been using these http://www.cui.com/product/power/ac-dc-power-supplies/internal/1~50-w/vskm-s5-series with great success. Mainly for onesy-twosy projects around my office and for friends. ...
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    Re: Faze Hot Plate Clone

    Fanie, I just wanted to say thanks for your help with A/C switching. I recently bought a Thermawave IR oven and ripped the guts out and replaced them with my own. I used some pretty fat 25A triacs...
  6. Re: Proton 24, release. Proposal and call for discussion.

    I pay for commercial licenses on an annual basis. Labcenter would be the obvious example to most here. I am fine with this for Proton 24.

    1. What would be the license or payment cycle for...
  7. Thread: Thermistors

    by ohararp
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    Re: Thermistors

    Tim, as always let me know if you have the thermistor lookup tables. I did some matlab code to translate the given resistance-> temperature. It was pretty simple to then generate a lookup table...
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    Re: Itead Printed circuit boards

    I actually just placed another order over the holiday. Hard to beat their pricing and turn times.
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    Re: Help choosing serial to ethernet module

    I second any code sharing! Definitely interested to see how you did this!
  10. Thread: Curve Fitting

    by ohararp
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    Re: Curve Fitting

    Geoff, a 4th order polynomial is a pretty tall order. Doing a least square linear fit wouldn't be a problem though. Got any data that you can use to start with? Are you looking for a floating...
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    Re: SMT soldering service

    Ray, if that is all the smt parts you have you can do all this with a soldering iron no problem. Flux and copper braid are your friends. TQFP parts are a pain even with stencils. Bridging can be...
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    Re: Stealing Proton

    Mav, I have put together a LPC11U24 dev board (without mbed interface chip). With the usb capability of this chip you don't even need to convert the .bin to hex. As long as a MSD is able to...
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    Just curious but did the cdata table end up working for you?
  14. View Post

    A really simple way to output a lookup table would be to use excel. By creating a column of Position Numbers and a column of Decimal Output. Sort the data by the decimal outout and...bam...your...
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    Got any code you can share? Sounds like you may not be setting up the ports properly to read them. I would recommend using PORTD of a ucontroller for this, since these are usually associated with 8...
  16. View Post

    This seems to be a pretty straight forward 8-bit port interface. Line up a single port to P1-P8 and you should be all set.
  17. Thread: Lookup tables

    by ohararp
    Replies
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    Re: Lookup tables

    So I recently did a thermistor project. And what I did (not steinhart) was to import a complete data table into matlab. I then took these values and plotted them. I then fit a log curve to the data...
  18. Thread: Lookup tables

    by ohararp
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    Re: Lookup tables

    Great thread and EXCEL spreadsheet on this subject can be found here at http://www.protonbasic.co.uk/showthread.php/59543-Steinhart-Hart-Linearization-Worksheet
  19. Thread: pwm to 0-10v

    by ohararp
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    Re: pwm to 0-10v

    I have used a 0-5V pwm through an RC filter to an opamp for isolation and constant current control feedback (see pdf attachment). See atttached 1450 . I think a combination of the proposed methods...
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    Re: Interfacing Max3155 Thermocouple Chip

    Here's some Max6675 code. These chips are a little pricey but make interfacing to a thermocouple super easy.


    Device = 18F25K22 Xtal = 16
    All_Digital = True
    Declare Watchdog =...
  21. Thread: Wifi modules

    by ohararp
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    Re: Wifi modules

    Tim, I am digging up this old thread, since I was searching the forum awhile ago. I have a need to monitor a liquid vessel and its temperature. I also wanted to put this data on the web using...
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    Re: programming 12f675

    This might be some better code to start with. You'll want to set the ANSEL and TRISIO registers for input/output.


    '****************************************************************'* Name :...
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    Re: TLC5940 is driving me nuts

    Chris, in keeping with the " sharing " theme of the forum can you post the code that works for the TLC5940 when you get that working?
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    Re: TLC5940 is driving me nuts

    Here's the code I used for the TLC5947. Not sure if this helps or not?


    '****************************************************************'* Name : OCTOBRITE_A.BAS ...
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    Re: Itead Printed circuit boards

    I can also vouch for these boards. Good price and good turn time. I rarely make my own boards anymore even though I have access to an LPKF router. Main reason is no thru hole plating capability...
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    Re: Simple Switcher Inductors

    These inductors are rated at 100 KHz http://www.coilcraft.com/dr0608.cfm
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    Re: Simple Switcher Inductors

    Without looking at this closely I was going to suggest coilcraft. They have a great sample program as well. I have ordered thousands of inductors from them because of their great service.
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    Re: Ultra Minature crystals

    These are not crystals, but I have found these resonators to be both tiny and reliable - http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&KeyWords=CSTCE16M0V53-R&x=0&y=0
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    Re: Alternatives for serial bootloading

    I can attest to the efficacy of Tim's bootloader. I think this would be a really welcome addition to the community!
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    Re: Right Angle Brackets

    Rick, nice find! I will totally take a look at those. I have seen them before, but never really thought of using those.
  31. Thread: Pic16f722 ctmu

    by ohararp
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    Re: Pic16f722 ctmu

    John, did you make any head way with the ctmu? Any sample code you can share? I have read the app note, but would curious to see what your code ended up looking like in PDS.
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    Re: Measuring water pressure

    Charlie, I have a 4 bar sensor (in package unopened) http://www.sensormateonline.com/datasheet/SST/SST81_STD.pdf That works very well. IT runs on 9-30VDC and outputs 5VDC analog. I ordered these...
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    Re: pressure transducer

    Charlie, just wondering if that sensor worked out for you? I saw another related post and was just curious.
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    Re: Multitasking OS

    JohnB, I do apologize. I ended up getting the temperature controller I was working with going using a simple state machine.
  35. Re: Can anyone tell me if this is a good deal? Any workshop cheaper than this is wan

    I just used iteadstudio for the second time. Pretty good deal there on boards right now. Next time I will opt for Fedex shipping since it took 2 weeks for boards. If you are in no rush China...
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