Search results

  1. pgib8

    New guy just getting started need advice on tools

    That's funny, I also bought mine from saelig and it's also an owen scope (SDS7072V). I'm pretty happy with it although I have run into a few minor shortcomings already. Since you're working with audio, you might really enjoy the FFT feature. I also like to hook mine up to the PC via USB to take...
  2. pgib8

    PIC programming

    Very cool. Even with ARM core. Have fun.
  3. pgib8

    PIC programming

    The PICs are broken down into many categories. That name specifies precisely which PIC it is. Some of the same PICs have more or less pins, some have more or less flash and RAM. With the number you posted, that's how you can find out exactly what you have.
  4. pgib8

    Hi and pic question!

    PICs are great microcontrollers, especially for beginners. Definitely get a real basic one first, just look at how many pages the datasheets are, because that's what you will be using alongside - but of course make sure the PIC has the features you need, perhaps analog inputs. I also like that...
  5. pgib8

    Hot-swap dual battery setup.

    Off each battery, use a zener diode with a pull-down resistor. once the voltage of the battery falls below the threshold, it turns off the mosfet and stops using that battery and at the same time switch on another mosfet to use the other battery. but if both batteries are about dead, the thing...
  6. pgib8

    Diodes

    Here's the thing, a regular diode has a very high reverse breakdown voltage, you may need to have like 1000V to overcome it (just an example), plus then you probably break the diode. So really, no current will flow. Now there are zener and TVS diodes that are designed to have a specific and much...
  7. pgib8

    clever I2C/SPI switch: fail

    And we have a winner: @dorke So yes, a simple relay is the perfect solution and I was severely over-complicating things. The reason the circuit didn't work is because it creates a never-ending feedback loop. Once a line is pulled low from one side, it will pull it low on the other side which...
  8. pgib8

    FW rectifier - can't measure DC

    Had to think about this one and I was in fact confused. So maybe then, you put the ground lead above the resistor and effectively bridged it. In that case your drawing is inaccurate.
  9. pgib8

    FW rectifier - can't measure DC

    on my scope, the ground leads of each probe are internally connected and they are also connected to real ground. my scope has a battery so i can operate it in an isolated mode but the grounds of each channel are still connected. could it be possible that through the ground leads, you are...
  10. pgib8

    clever I2C/SPI switch: fail

    I'm working with a microcontroller where I had to select the small version with fewest pins to save space. So now I have I2C and SPI sharing some of the same pins. If I want to use both, it's easy in firmware but more difficult on the hardware side. The SPI device(s) won't be an issue because...
  11. pgib8

    clever vibration motor driver?

    True :) I don't know why I'm doing the cardboard. I started using it once and ever since then I like it. I also used to use hot glue to hold everything in place, then one time I didn't find my hot glue and I used super glue and ever since then that's what I use now. It is such a relieve not to...
  12. pgib8

    clever vibration motor driver?

    Hi again, it's been a while and I now got around to prototyping the circuit. It works very well. Thank you all for your feedback and ideas!
  13. pgib8

    Voltage divider protected by Zener diode

    @CDRIVE, that's a good tip. Using the forward voltage always seems like cheating but if it works, it works. In my case I've gone to a 10V Zener and the voltage divider comes after it.
  14. pgib8

    Voltage divider protected by Zener diode

    I'm building a voltage divider to scale the input voltage down to something that the 10-bit ADC can measure, to do voltage measurement. I want to have the maximum resolution in the area of interest (3 to 4.2V) and I don't care about anything above that. The max input voltage is 20V. If I just...
  15. pgib8

    Voltage divider protected by Zener diode

    I'm looking for a voltage divider that also has its output clipped at about 3V. I need to do voltage measurement and I'm going to use a voltage divider. I want to "magnify" the lower region. The input is 0 to 20V but I'm really interested in 0 to 4.2V (Li-Ion battery). So I thought I use a...
  16. pgib8

    Help With Kids Homework

    I'm sorry but this is a really bad assignment (my opinion). I'm totally struggling with it, trying to figure out what the teacher wants (lol).
  17. pgib8

    Anyone feel like helping a complete idiot?

    Don't be so hard on yourself, you can't be that dumb taking on a project so far out of your "comfort zone". Is the snake out of very soft material? If so, the vibration may not be felt. Have you ordered some of these motors and tested them on the battery? Do you have a multimeter that you can...
  18. pgib8

    3.6v i2C part in a 5V uP circuit

    Well the nice thing about I2C is that all the outputs are open-drain / open-collector, meaning they will only ever pull the signal low or leave it floating, but never source anything into it. The lines are pulled high by pull-up resistors. So I'm thinking that you simply pull them high to 3.3V...
  19. pgib8

    Controller is not running properly as per logic after removing PICKIT3 programmer

    Try a very small sample program, then start adding in your other code and see where it fails. If the small sample program also fails, post it.
  20. pgib8

    clever vibration motor driver?

    thanks Hop, means a lot coming from someone with your experience :) At this point I'm done with it at least until prototyping the circuit. As for what motor it's using, I asked myself the same question but couldn't get a part number, just a link to ebay :) I tested two pieces I have on hand and...
Top