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Recent content by marrc

  1. M

    eagle eda library

    hi all! i was trying to add adafruit library to my free eagle eda software. for this i downloaded the adafruit library to my pc hard drive . i have downloaded the library to my hard drive and added its path to the blank space next to"Libraries" under drop down of "directories". the exact path i...
  2. M

    4inch 7 seg display

    hi guys! i have recently purchased a 4 inch 7 seg ment CA display but cant manage to locate its datasheet. the part no printed on the digit is SUNR400CA-S090318. can anyone tell me how much current does it draws per segment? thanks in advance, cheers, marrc
  3. M

    [SOLVED] problem with coding 123

    Hi Klaus! thanks so much for your comments. someone has told same thing to me earlier about referring to datasheets, but i know i might sound stupid but i find them a bit boring! P.S:by the way the online document worked this time ,some tweaking in hardware was needed Cheers, Marrc
  4. M

    [SOLVED] problem with coding 123

    Hello Klaus! I am a newbie to arduino and am just trying to check if my recently purchased mcp4725 is working fine. i thought that a simple way to do that would be to read an analog voltage to arduino and make it convert it to digital form and send it to the dac. the dac would then convert it...
  5. M

    [SOLVED] problem with coding 123

    hi guys! i recently purchased dac mcp 4725 and just tried connecting it to arduino so i am giving 0-5 v at A0 pin of arduino problem is Mcp4725 is always op 2v only irrespective of voltage at A0 pin i think its a coding error my code is as follows: A0 pin is connected to center of pot...
  6. M

    problem with arduino

    hi FenTrac, increasing the delay does brighten the digits but they also start blinking. now it has boiled down to finding a compromise between digit brightness and digits blinking. how to make the digits bright and steady? cheers, marrc
  7. M

    problem with arduino

    sorry for the late reply...actually when i dint get any replies i stopped checking. your reply has given me some hope, but can you help me with the code . what you say makes sense but i just couldnt translate it to code. cheers, marrc
  8. M

    problem with arduino

    this is code i am using (some parts were missing): #include <adafruit_max31856.h> // inclusion of temperature module library int latchPin1=2; //for small display int dataPin1=3; int clockPin1=4; int D5=5,D6=6,c=0,switchState,dig,dig_1,dig_2,dig_3,dig_4; float c1; int...
  9. M

    problem with arduino

    hi guys! I have recently put together a device that can measure and display temperature. i am using 2 seven segment displays, one small display for displaying some parameters and 1 large display (4inch height) for displaying the temperature. now the problem with the large display is that the...
  10. M

    measuring analog voltage using arduino

    Hi again, I have tried your idea, i am getting proper scaling (electrically) though am getting range on serial monitor i.e -5v ip on a0 shows as -5 and 5v shows as 5v but in between the ops are unstable, so like for 1.3v i am getting following readings on serial monitor(in mv): there seems...
  11. M

    measuring analog voltage using arduino

    hello! I am trying to measure and display analog +5 to -5 v on arduino using below sketch, void setup() { // initialize serial communication at 9600 bits per second: Serial.begin(9600); } // the loop routine runs over and over again forever: void loop() { // read the input on analog...
  12. M

    unstable arduino based frequency counter

    hi, yes "when no i/p applied" means no i/p signal connected. there is no pullup/pulldown the input is directly connected to the arduino(digital pin 8) 555 is NE555 timer in astable mode..not sure about the frequency though... i am using a mid sized cap and 2K resistor,if that helps - - -...
  13. M

    unstable arduino based frequency counter

    hello, am getting following out puts on serial monitor: a) when no i/p applied : 50 b) when 555 connected to i/p: values changing continuously between hundreds,thousands, ten thousands for the same applied input i have used following code: const int pulsePin = 8; // Input signal connected to...
  14. M

    TC 9400 v to f converter

    Hi ! You havent replied.. Since when i posted last i have found that was incorrectly connecting the cro strobe pins(was not connecting the ground of the cro to the gnd of the ckt) i think thats why i was getting the w/f like the ones i have attached.. now i have rectified that mistake but am...
  15. M

    TC 9400 v to f converter

    HQ image attached. Vss and Vref are shorted right?
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