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  1. foTONICS

    nesting a program with a bool statement

    so I have this program that asks a user to enter a time(24 hour clock) and spit out the next available flight. the program works except for one thing: I've tried to get it to loop until a user chooses to quit (giving the variable <int action> a value of 2) but no matter the value of <action> the...
  2. foTONICS

    old laptop

    so i have this laptop that recently went past its prime. if i wanted to harvest the hard drive out of it to use as an external drive can i just pull it out or is it more complicated than that, does it need to be specially formatted?
  3. foTONICS

    faulty car blinker relay

    So the relay to my rear right blinker is acting funny. sometimes the lightbulb gets shaken loose (the housing is broken) and instead of the steady blinking that we are all familiar with, ~1-2Hz, I get something somewhere two-three times as fast. if i go back to the trunk and fiddle with it it...
  4. foTONICS

    problem with resonant frequency

    Hey all, I work at a school lending out materials and offering advice whenever I can. A student came up to me the other day and was asking about folded dipole antennas. He was constructing a antenna that he built from a schematic in a textbook (This was a few weeks ago so I don't have any...
  5. foTONICS

    TLC5940 LED driver

    I'm trying to understand how to write in the values for PWM for this chip. The problem isn't writing in the values, I can get a micro to do that; I just want to know if I'm right at thinking that 0.0 would be 0% for output 0 and 0.11 would be 100%. So is it safe to say that the smoothest...
  6. foTONICS

    spreading out the PWM on a PIC16F627a

    I have 6 sets of LED's, each set consists of around 5 LED's (give or take an LED) arranged in a circle. I wanna use the PWM pin on the PIC to fade these lights in and out but I know I can't drive that many LED's with a single pin. Would it be feasible to use the PWM pin to source 6...
  7. foTONICS

    searching for sensitive load cell

    In my final year of schooling I have chosen to design and build an electronic beer pong table. Nothing fancy, just a circle of LED's that shine one color when the glass is full, a different when it is empty, and off when nothing is there. I've started to research into what kind of sensor...
  8. foTONICS

    turning off timer1

    So this is the code I'm using, nothing fancy, just a string of LED's lighting in sequence from one end to another. My problem is with pin13 (RB7/T1OSI/PGD). that LED won't light and I've tried turning it off and configuring it as an output but still nothing, I believe I'm pointing to the right...
  9. foTONICS

    knight rider code

    so I'm writing some code to have a set of LED's flash in sequence like the knight rider. I tried turning on and flashing only 2 LED's and that worked, but when I added another 6 to make 8 total nothing turns on. I checked my circuit and everything seems okay so I was wondering if it's my code...
  10. foTONICS

    understanding the pic16f627a

    So I've been doing lots of reading and researching and I feel I can confidently program one of these babies except for one thing. My problem is any tutorials i read i can't seem to find how to initialize one of the outputs. I dont know what to call them when writing my program. looking at...
  11. foTONICS

    multiplexing using assembly

    Hey guys, I've been teaching myself PICS by going through this tutorial website someone on here posted a while ago www.googligum.com. and I find it extremely useful and informative. Attached is a screenshot of a section of code used to increment the value of some digits (being sent to a 7-seg...
  12. foTONICS

    Arduino in North York/Toronto area?

    Hey guys, I'm looking for a place that sells Arduino's in the North York/Toronto area. The only place I have found is charging about $50 for one and I wanted to see if I could find it cheaper. Online is out of the question since I do not have a credit card, many thanks!
  13. foTONICS

    logic probe

    so I just want a basic logic probe, red = LOW & green = HIGH. I don't care for frequencies just those two basic needs although I am putting some rules down for my project. Mainly when I'm not touching anything I don't want either of the two LED's to turn on. Attached is my idea. The probe...
  14. foTONICS

    controlling lights

    Hey all, I've been kicking around several ideas for having music influence 3 sets of lights ( low, medium, and highs). at first i was using sallen key active filters but just thought of something. i remember in my telecomm class we talked about tank circuits and how we can pull AM/FM signals...
  15. foTONICS

    RS-232/TTL encoder

    Hey all, I have a DTE/DCE board which takes a TTL signal from one end and translates it to a RS-232 signal (-15/+15 out of phase signal). These boards are already made, I'm just testing them to make sure they are still functional. I have a Tektronix osciliscope monitoring the TTL signal...
  16. foTONICS

    lights synchronized with music

    So I'm trying to develop a circuit that will allow LED's to turn on and off depending on what the frequency is. I have decided to split the circuit into three parts; the first one detecting anything from 0hz - 2kHz; the second stage detecting 2kHz - 6kHz; and the last stage detecting anything...
  17. foTONICS

    LM741

    I am designing a cascading low pass filter to stop frequencies around the 2kHz band. I don't mind if the filter response bleeds into the 3kHz band but I would like to make sure it doesn't go any further. Right now I'm using two LM741's but wondered if there were already IC's that had multiple...
  18. foTONICS

    556 clock problem

    I have a 556 timer set up to produce two different square waves (1Hz and 10kHz). The 1Hz signal coming off of pin 9 works correctly, but the 10kHz coming off of pin 5 just shows a steady 5V. I checked the voltage divider going into pin 1 (which controls the 10kHz) and it shows 5V. The...
  19. foTONICS

    6264 RAM IC

    Hey all, my teacher gave us this problem of needing a 16k x 8 bit memory. He gave us an example of one 6264 and how to set it up but now he wants us to add a second one so that we can get the required 16k. I know how all the enable, read/write functions work and also how the data inputs are...
  20. foTONICS

    lightning arrester @ base station

    Hello all, We were having a discussion about lightning arresters at radio towers and their purpose (providing lightning a easier path to ground so as to not destroy the sensitive Rx). But someone brought up a good point, what stops the wanted RF signal from being shorted to ground? He...
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