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Type: Posts; User: instrumentek

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  1. designing an external teensy boot loader for MK64. PTE pins hi, low or open?

    Hi;
    I have successfully integrated the MK64FX512VLQ12 with an on board MKL04Z32 into my project. Now I want to build an external programmer and remove the on board MKL04, then have an external...
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    3.5 144 lqfp diy

    For anyone needing a start point using the 3.5 144 pin LQFP. Use at your own risk, It worked for me.



    12349
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    I have no idea how that library works. I utilize...

    I have no idea how that library works. I utilize a keypad but used my own code, its a 3x7 keypad. 3 of the pins are interrupts, the other 7 pins are normal digitals. When the interrupt is toggled it...
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    depending the circuit configuration you could use...

    depending the circuit configuration you could use several (4?) diodes to allow voltage to you interrupt pin when one of the keys is pressed. The diode should prevent the keys from interacting with...
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    Here is a snippet of code i use: keyPad =...

    Here is a snippet of code i use:

    keyPad = 0;
    txmsg.len = 3;
    txmsg.ext = 1;
    txmsg.id = 0x16EA0000;
    //_____________________________________write request for pgn 65253
    ...
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    I'm no expert, but I have used the extended ID...

    I'm no expert, but I have used the extended ID Flex can for J1939 data. I do not think the Transceiver cares weather it is extended or not. The transceiver is just a signal amplifier. I have used...
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    Hi; What are the chances you would share the...

    Hi;
    What are the chances you would share the files for this project?
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    freelance for small teensy project

    Hi;
    Basically I have a project using the teensy 3.5. I use nearly all the pins on the teensy and have to solder all the bottom side pins. This is very time consuming to produce my project. I want to...
  9. This worked perfect, Thank you. I just need to...

    This worked perfect, Thank you. I just need to change the rest of my code to work with this new type of data and I will be up and running!!
  10. Is there a way I could edit the EEPROMEX library...

    Is there a way I could edit the EEPROMEX library to correct this?

    change uint16_t to INT?
  11. EEPROMEX with teensy 3.5 and 2.0++ returns different values

    Hi;
    I have an issue that I'm hoping someone can point me in the correct direction. EEPROMEX function EEPROM.readInt returns an incorrect value on teensy 3.5 but returns correct value using the...
  12. Got mine yesterday (Canada).... so nice

    Got mine yesterday (Canada).... so nice
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    Hi; I work on hydraulic solenoids like this...

    Hi;

    I work on hydraulic solenoids like this quite often, And most actually respond better to PWM. As the hydraulic solenoids age / get dirty the develop internal friction and a dead band. The...
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    Price is CAD with tax: 6623

    Price is CAD with tax:

    6623
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    I have had good luck with MyRo PCB but they are...

    I have had good luck with MyRo PCB but they are in china, boards are 1-2 weeks standard. approx 60 USD for 2 layer x 5 shipped UPS.
  16. Hi again; sorry about the delay today is my...

    Hi again;
    sorry about the delay today is my first day off again. I have done some more testing and wrote a different program so I can give some better and quantitative observations. The below...
  17. In the program in message #5 the LED blinks...

    In the program in message #5 the LED blinks (digital output 9) off and on 5 times a second for the first delay of 5 seconds. After the tone(21,1000); no tone(21); The blinking still happens but its...
  18. I just realized IntervalTimer must also have a...

    I just realized IntervalTimer must also have a conflict with the timers in the different functions. I had more then one issue. I have found if i activate tone() on a pin then off again it slows the...
  19. I think i got it somewhat working. I needed to...

    I think i got it somewhat working. I needed to declare the timer after initialized the display screen(which i forgot to add into the code i posted here). I was trying to make a sketch to demonstrate...
  20. Thanks for the ideas; I tried both of these...

    Thanks for the ideas;

    I tried both of these and have the same issue. There is also something else i am noticing, if i call "tone" (in my un-edited program) the interval timer starts to work again?...
  21. conflict with IntervalTimer and display library

    Hi;

    I have an issue where intervalTimer runs until I call my display to print. I'm thinking its a conflict of some kind. I cut down the program to demonstrate the issue. I'm using:
    - Teensy LC ...
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    Its a risk for sure but its for parts like banana...

    Its a risk for sure but its for parts like banana jack connectors, and the molex style wire leads ect, so i could find them elsewhere if needed.
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    That would be a neat and save costs overall...

    That would be a neat and save costs overall because i could eliminate my currently planned interface. but i think for my application not the best, i'm making a tool for technicians that will be using...
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    Thanks for all the good ideas, One thing i...

    Thanks for all the good ideas,

    One thing i will change is adding test points. I currently have a company and make similar products so some items mentioned I have considered before, thinking about...
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    any cost reduction ideas?

    Hi,
    Just looking on any pointers for reducing costs on a project I want to market. I am using a Teensy LC and assembled PCB with approx 50 parts. It also incorporates an extruded aluminum case,...
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    Yes Flex can does work with with j1939, earlier...

    Yes Flex can does work with with j1939, earlier in this thread i posted a snippet of code i use for extracting active fault codes. For receiving extended messages i did not need to make any changes,...
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    here is a snippet of code for anyone trying to...

    here is a snippet of code for anyone trying to decode j1939 error codes with the flexcan library:



    sourceAddress = rxmsg.id & 0x000000ff; // mask out 2 byte source address
    PGN = (messageID &...
  28. the last method worked well thanks

    the last method worked well thanks
  29. Hi; I tried both the first and second method...

    Hi;

    I tried both the first and second method listed above:

    The first method gives me an error: first - invalid conversion from 'char' to 'const char*' [-fpermissive]

    The second method works...
  30. Thanks, I will try these when I get home from...

    Thanks, I will try these when I get home from work.
  31. SD library; declaring different file names using "if" statment

    Hi;
    I'm wondering if there is a way to call different file names to one file declaration so I can save on repeated coding for different file names. here is an example of my code:



    #include...
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    Hi; Just want to add something for anyone else...

    Hi;
    Just want to add something for anyone else interested in j1939. Teachop's Flex can works well for the extended ID and j1939. I have a very rough code reader that has been tested on some...
  33. reverse polarity protection is easy to accomplish...

    reverse polarity protection is easy to accomplish on 4-20 mA circuts; just place a diode in series with your resistor. Your sense line needs to be between the diode and the resistor. 4-20 mA circuts...
  34. the data sheet says it provides "2.1 kVRMS...

    the data sheet says it provides "2.1 kVRMS Voltage Isolation" It should be well protected. 47 x gain from 5 amps you could have a max span of 106 mA if you wanted, although accuracy of that would be...
  35. ACS712 Fully Integrated, Hall Effect-Based Linear...

    ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor for 1.71$
  36. Its kinda late for this but a cheap hall effect...

    Its kinda late for this but a cheap hall effect sensor:

    http://www.ebay.com/itm/20A-ACS712-Module-5V-Measuring-Range-Current-Sensor-Hall-Board-For-Arduino-new-/281683071902?hash=item41959e939e
    ...
  37. I guess to sum up I would suggest a lower...

    I guess to sum up I would suggest a lower resistance resistor to increase the range like 50 ohms @ 1.2 volts then you have a range to 24ma.
  38. If you did this you would be limiting yourself to...

    If you did this you would be limiting yourself to 20.00 mA exactly, depends on the application i guess but i have on my work bench now 4 pressure transmitters that full scale over 20 mA; like 20.1mA...
  39. A couple things to consider, many 4-20 devices...

    A couple things to consider, many 4-20 devices have a failed high option so 165 ohms x 20 ma = 3.3 exactly will not give you any room to detect anything over 20 mA. I would suggest a lower value....
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    I tried getting an hc 05 and changing the class...

    I tried getting an hc 05 and changing the class of the device so I phone would connect but is still didn't work. +1 for android app inventor it's a very good tool, however to start I would recommend...
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    what BT module do you use? I use an HC-06 to send...

    what BT module do you use? I use an HC-06 to send and receive serial commands from my phone. FYI The I phone does not work with the HC series BT modules
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    I have ran into similar issues but it was not EMI...

    I have ran into similar issues but it was not EMI it was feedback from the relays when de-energizing, a large high voltage spike would somehow make it back to an I/O pin on the teensy. I used some...
  43. The only issue I see would be overloading the...

    The only issue I see would be overloading the power supply during an In rush when first powering up charging the caps. Is that same 5v supply also powering your teensy? The power supply will already...
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    I've had issues before where the Teensy and...

    I've had issues before where the Teensy and another serial device install onto the same com port in windows rendering the serial moniter in arduino IDE non functional, while programming it still...
  45. I had to google PLL (phase-locked loop). So if...

    I had to google PLL (phase-locked loop). So if for example i'm try to read serial data or use the tone library this would not work correctly as slowing down the CPU will effect all timers? I can...
  46. Changing delay to a function that slows clock speed for power savings

    Just wondering about Changing delay to a function that slows clock speed for power savings. Is it a bad idea to change clock speed frequently?


    void loop() {
    //do some jazz
    CPUdelay(1000);...
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    Assuming the 48 pin form will at least have as...

    Assuming the 48 pin form will at least have as many or more I/O then the teensy 2.0 ++. I'm already planning my next project and i'm short a few with the teensy 2.0++. Regardless of how the extra...
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    complete newbe suggestion, what about...

    complete newbe suggestion, what about implementing finer pitch through hole pins all the way around but then with each teensy 3.x++ provide another pcb that goes from the finer spacing to the larger...
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    Looks like the K26 is not going to be 5V...

    Looks like the K26 is not going to be 5V tolerant, but still looks very nice.
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    My vote is for the 3.x++

    My vote is for the 3.x++
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