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  1. Jouellet

    video generator: guidance needed

    ok....mixing signals is not an option. what about "manipulating" the signal, by overwritting portion of the signal, by writting the required text ... I'm sure that I'm not the only one who needs to embed text in a video signal ! That must have been done before !
  2. Jouellet

    video generator: guidance needed

    Hi folks, another project: I have the signal from a camera. It's output is in HDMI format. I need to be able to "encode" some information into the image, such as pre-defined location and distance (given by an encoder. could be Arduino driven) my first thought was to use a Raspberry PI to...
  3. Jouellet

    Getting started making PCB with software like Eagle

    Follow up about PCB manufacturer Note that this is my personal experience, and other peoples might have different opinion about it ! Got frustrated by PCBway, because I've sent them a board design, that was actually 2 designs, merge into 1 Gerber file, still within the 100M x 100mm limit. They...
  4. Jouellet

    PCB: panel vs single board

    Hi Bob, my Gerber had 4 of the same exact design, side by side, with a line of drilled holes (1mm, 0.15" apart) separating them. My goal was to either "snap-break" them apart, or cut them along the drilled line.
  5. Jouellet

    PCB: panel vs single board

    hi folks, Lately, I had my first "professionally made" PCB done. The deal was that it had to be below 100mm x 100mm One if my design was way smaller than that so I thought "I'll just put more than one per board" thinking I just had the "idea of the year", while staying below the 100x100 limit...
  6. Jouellet

    Getting started making PCB with software like Eagle

    Hi Folks, I just want to share my experience of getting started with my first "professional-like" PCB. For years, I've made PCB: first using a pen, on bare boards, then migrated to tape & rub-on kit. The next step was using positive sensitive boards. That allowed me to produce more than one of...
  7. Jouellet

    Detecting A Knock Pattern

    Okaaaaay ! I thought it was some kind of expression in English ! I actually was able to use that as my knock pattern ! Due to the closenest of some notes, I had to be a bit slower and could not use the "high sensitivity" on my circuit...
  8. Jouellet

    Call Progress tone

    hevans1944: I'm building a prop for an Escape game. That rotary phone is not going to be connected to a TELCO system/line, but rather to some sort of PLC: the 4 wires of the regular RJ11 will be connected like this: 1- +12V 2- relay COM 3- relay NC (or NO) 4 - Gnd There will be up to 16...
  9. Jouellet

    Detecting A Knock Pattern

    Hevans1944: Being francophone, I'm not sure what you mean by "shave and a hair-cut... two bits", but I guess it's positive ! As for whistle recognition, I like your optimism, but I don't think it's going to happen soon ! For those interested, here's the (almost) final code: /* * knock detector...
  10. Jouellet

    Call Progress tone

    hevans1944: you are absolutely right, and the result would probably be better, but given the fact that a Pro Mini sells for about 2 US$ on Ebay (including shipping), it may not be worth the effort, (and money) to design a PCB, assemble it and test it !
  11. Jouellet

    Call Progress tone

    Follow-up: Managed to do it. Had to use 2 Arduino: one that has a command Tone() generating 350 HZ and another that generate at 440 HZ. both connected to the same speaker. has to use 2 Arduino, because Tone() can only be used by one pin at a time....
  12. Jouellet

    Call Progress tone

    Thanks to you guys. One thing I wasn't sure but I think I understand now: the signal is made up of 2 continuous frequencies. I need to generate (opamp or arduino) both frequency at the same time, then hook them up to the same speaker, so they kind of "blend" together... Right ?
  13. Jouellet

    Detecting A Knock Pattern

    Hi Guys, follow up on my project. I did it by enabling the interrupt to capture when a knock is detected, then sampling every 25ms and saving the result. I "teach" the sequence and for every position where a bit is recorded, I set the 2 bits before and after to '1', therefore making it a bit...
  14. Jouellet

    Call Progress tone

    Hi Everyone, I'm working on (another) project: I need to hack an old rotary phone and when the proper number is dialed, a dry contact is activated. The phone IS NOT connected to any phone line. when people are picking up the phone, I want to generate/simulate the "Call Progress" tone, to make...
  15. Jouellet

    Detecting A Knock Pattern

    Hi everyone, I'm looking for a way to detect a knock pattern. something like: toc----toc---------------toc Getting the 'toc' shouldn't be a big problem: I'm planning on using a microphone or a piezo, and detect 'spike' of signal, corresponding to the knock themselves. I mostly use Arduino...
  16. Jouellet

    Need advise on charging Li-Ion battery

    Alec_t: if you find the proper datasheet, let me know !
  17. Jouellet

    Need advise on charging Li-Ion battery

    Hi folks, I bought a couple of these: http://www.ebay.com/itm/121845454110?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT and a couple of these: http://www.ebay.com/itm/351633458803?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT my need is to put 2 batteries in...
  18. Jouellet

    Tension/Pressure sensor?

    for a typical circuit: http://edg.uchicago.edu/tutorials/load_cell/ INA125P is super easy to use....
  19. Jouellet

    How do I multiplex lots of switches/LEDs with my Arduino

    8 I/O points expansion module You could configure 4 points as Inputs and 4 points as Outputs You write 0/1 thru I2C to turn outputs on/off And read thru I2C
  20. Jouellet

    How do I multiplex lots of switches/LEDs with my Arduino

    Maybe you could consider I2C expansion. PCF8574 as a chip or this module: http://www.ebay.com/itm/PCF8574-PCF8574T-Module-Communication-Module-I-O-Expansion-Modules-I2C-h-/111787743916?hash=item1a07119aac:g:cBwAAOSwKIpWDzzq fairly easy to use and lots of library/actual projects available on...
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