Search:

Type: Posts; User: baileychic

Page 1 of 20 1 2 3 4

Search: Search took 0.01 seconds.

  1. [SOLVED]Closed: Re: PIC16F877A controlled 74HC595 by serial command

    I can help you with your project. You really need to use a delimiter at the end of each UART command transmission which controls the output of the 74HC595. A 0x0D delimeter will be fine. If you use...
  2. Closed: Re: Multiplexing problem in my 8051 clock project.

    It is because of using delays in the main loop where the 7 Segment display codes are also called. It is time for you to learn how to multiplex 7 Segment display using Timer interrupt in the interrupt...
  3. Replies
    8
    Views
    461

    Closed: Re: AutokeyReset function

    I can provide you a working code but only mikroC PRO PIC code if you are interested and if you can port it to your XC8 code because I don't use XC8 Compiler much.
  4. Closed: Re: PIC18F based Motor Controller Design, Is it good?

    I use a Motor Driver (L293D) to drive the MOSFETs because L293D cannot drive a 200V 10A or more DC motor. Gate of MOSFETs need say 10V or more (Vgs datasheet ratings usually +/-20V) so that the...
  5. Closed: PIC18F based Motor Controller Design, Is it good?

    Hi,

    This is my PIC18F based Motor Controller Design. PIC18F circuit is not shown in the schematic because my question is with Motor Driver circuit.

    I want to know whether my circuit is good?...
  6. Replies
    3
    Views
    587

    Closed: How to make a lumen meter?

    How to make a lumen meter?

    I am planning to make a lumen meter to measure lumen output of Power LEDs using PIC12F microcontroller.

    Lumens are expressed in Lumens/Watt usually.

    So, if I know...
  7. Closed: Re: Attiny85/Atmega32u4 internal differential ADC to replace HX711?

    You need to check your AVR datasheet for the minimum value of AREF that you can use.

    If say, min value of AREF that can be used is 2.5V then you can only feed max 2.5V input into your AVR's ADC...
  8. Closed: Re: Attiny85/Atmega32u4 internal differential ADC to replace HX711?

    HX711's input voltage range is +/- 20 mV (40mV) or +/- 40mV (50mV).

    What do you think your Arduino's ADC VREF+ (AREF) should be?
  9. Closed: Re: For loop termination with data in array is 0xff

    microSD Card interface to read files and above code to send read bytes to eeprom.
  10. Replies
    45
    Views
    2,342

    Closed: Re: HX711 mV/V information needed

    Okay, will do that.
  11. Replies
    45
    Views
    2,342

    Closed: Re: HX711 mV/V information needed

    Its not me but the client who wants to overload the Load Cell.



    Of course not.
  12. Replies
    45
    Views
    2,342

    Closed: Re: HX711 mV/V information needed

    I will explain with an example.

    Let's say we are using a 30kgs 2mV/V Capacity Load Cell with HX711 @ 128 as gain and 5V as excitation voltage (EV), then

    for 5V EV and 30kgs weight we get 10mV...
  13. Replies
    45
    Views
    2,342

    Closed: Re: HX711 mV/V information needed

    The client is telling that with my code a 600gms Load Cell is easily measuring up to 30kgs weight accurately.

    Load Cell Ultimate Overload is 200% and
    Safe Overload is 150%.

    200% of 600gms =...
  14. Closed: Re: How can I measure this voltage and current?

    The load is resistive only but I will get another confirmation about it from the client.
  15. Closed: Re: How can I measure this voltage and current?

    You mean I have to use Linear optocouplers like IL300 between scaled 5V DC and ADC input?
  16. Closed: Re: How can I measure this voltage and current?

    Why should I measure minimum? If I use a diode to convert 400Vp-p signal to 200Vp signal (200 - 0.7V) and use a 200uF 300V capacitor and charge it then it will charge to 200 - 0.7V and if I scale...
  17. Closed: Re: How can I measure this voltage and current?

    It is 400Vp-p 1 Hz square wave.
  18. Closed: Re: How can I measure this voltage and current?

    Can I drop the voltage to say 5Vp-p range using a voltage divider and then use a diode and a capacitor to charge the capacitor to the peak value of scaled signal which will be 5V - diode drop. Let's...
  19. Closed: How can I measure this voltage and current?

    How can I measure this voltage and current?

    It is 400V peak-to-peak @ 1 Hz and it is connected to an R load. Current in R varies between 100uA and 1.5A and I need to measure both voltage and...
  20. Replies
    45
    Views
    2,342

    Closed: Re: HX711 mV/V information needed

    Client tested it and got accurate results. Weighing Scale working fine now.

    https://mega.nz/#!uAACCA6b!Ptfi4DBGuN4Fy30L9xqy75PJ9X_A0Nh4Junl36Xs6Bo
  21. Replies
    23
    Views
    999

    Closed: Re: MOSFET Gets Hot in H Bridge

    I replaced the Mosfets to IRFP250N.

    For PWM signal > 50 kHz the output signal is getting distorted and also the HOx and LOx signals. What changes are needed to the circuit to get clean output for...
  22. Replies
    23
    Views
    999

    Closed: Re: MOSFET Gets Hot in H Bridge

    Here is the simulation output. I have not yet built the hardware.

    - - - Updated - - -

    Updated file. VSx probes added. See the graphs and tell me how to fix the high-side voltage issue.

    - - -...
  23. Replies
    23
    Views
    999

    Closed: Re: MOSFET Gets Hot in H Bridge

    Okay, increased the C1, C4 capacitors to 22uF but no change in output.

    I am using 50% duty PWM. Should I increase the duty to say 90% to get high output voltage of say +22V or +24V?
  24. Replies
    23
    Views
    999

    Closed: Re: MOSFET Gets Hot in H Bridge

    That was a mistake. I changed them to 10R but the output voltage goes to max 9V now.

    HOx and LOx voltgaes are fine and they are 36V and 12V respectively.

    HOx = 24V + 12V = 36V and LOx = 12V...
  25. Replies
    23
    Views
    999

    Closed: Re: MOSFET Gets Hot in H Bridge

    From your circuit in post #1 you use 24V DC and 0V as GND and so I thought the output signal varies between 0V and 24V.

    Edit:

    My circuit works for your requirement if the GND connection in the...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4