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  1. Thread: UV sensor ML8511

    by Gusse
    Replies
    7
    Views
    6,920

    Re: UV sensor ML8511

    In Lapis website, they have graph including UV-index.
    1V = 0 UV-Index
    3V = 15 UV-Index

    Don't know how they have calculated that, but lets take it as it is.

    Scaling ADRaw: 310 (1V) - 925 (3V)...
  2. Thread: UV sensor ML8511

    by Gusse
    Replies
    7
    Views
    6,920

    Re: UV sensor ML8511

    It seems that it is challenging to calculate accurate UV-Index (0-11+), as you would like to do.
    Index is weighted using 3 different wavelengths and this broadband UV sensor covers all of them....
  3. Thread: UV sensor ML8511

    by Gusse
    Replies
    7
    Views
    6,920

    Re: UV sensor ML8511

    UV Index is defined W/m2 --> 1 mW/cm2 = 10 W/m2 (10x)
    From datasheet:
    UV Index: 0 = 1.0V (typ), 100 = 2.2V (typ)
    Make sure that supply voltage is very stable, 1mV = 0.833 UV index

    Check...
  4. Replies
    10
    Views
    6,874

    Re: OT - MOSFET choice

    Driver can be programmed to keep outputs low as far as you command otherwise.
    Try without any external resistors: serial resistor -> jumper, remove shunt (GND) resistor.

    Add components only if...
  5. Replies
    10
    Views
    6,874

    Re: OT - MOSFET choice

    You are right, 10mA pre-driver is weak even for this purpose, but still usable. Any application using higher switching frequency would compromise efficiency.

    Scampy, charge calculation for future...
  6. Replies
    10
    Views
    6,874

    Re: OT - MOSFET choice

    Hi Scampy,

    Based on IRF3708 datasheet, Rdson = 9.5mOhm (typ), Vgs= 4.5V, Id= 12A, therefore PCA9865 should be OK to drive FET without pre-driver stage. Gate resistor might need fine tuning. Ten(s)...
  7. Replies
    10
    Views
    6,874

    Re: OT - MOSFET choice

    There are couple of parameters that you should look.
    1) Rdcon. This parameter tells how much energy will be burned in device while FET is conducting current. Low is better and range of 10-20mOhm...
  8. Replies
    0
    Views
    2,610

    I2C EEPROM content flasher/eraser thru PIC

    I made a flasher/eraser program for I2C EEPROM (up to 24C64) thru PIC (e.g. PIC18F4520, 32K). So far, I have always had a socket (DIL8) for external EEPROM on PWB so that I can remove EEPROM for...
  9. Replies
    141
    Views
    113,913

    Re: A tft addin for pbp3

    Thanks for the schematic update. Now I have to start gathering all needed components.
    Why you have selected BS250, which has quite huge Rds(on), it is round 10 Ohm or more @3.3V. Why not go with a...
  10. Replies
    141
    Views
    113,913

    Re: A tft addin for pbp3

    Very nice work Richard!
    ILI9341 based TFT display with resistive touch screen could be the module that I was searching.
    With STMPE610 touch controller (SPI/I2C) it would be easy to make systems...
  11. Replies
    9
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    4,993

    Re: Newbie SPI question

    Have you checked LCD Wiki pages?
    There are most of the stuff you need available. Only thing you need to do is modify LCD controller specific parts to match your LCD display (e.g LCD init, std...
  12. Replies
    11
    Views
    6,249

    Re: Low power sleep mode 18f46k80

    Try to change all ports to inputs before entering sleep.
    With 18F4520 I can see big difference if I don't do that (~2mA vs 200uA, incl. quiescent current of the regulator).
    After sleep change ports...
  13. Thread: FineLineIDE

    by Gusse
    Replies
    187
    Views
    257,793

    Re: FineLineIDE

    Hi Norm,

    Thanks for the new version of FineLineIDE. I was trying it when I noticed something strange. Only part of code was visible in FineLineIDE and after debugging reason was Scandinavian...
  14. Replies
    29
    Views
    14,238

    Re: Again ADC with 12F675 ...

    Hi Fratello,

    1) Do you have two PCB with different resistor values?
    or
    2) Have you changed resistors to same board and tested with two SW settings?

    In case
    1) there must be some other...
  15. Re: 12F683, 12LF1840 - Port ON/OFF speeds are different!

    I think that you will not be able to do phase shift (delay) between 2 PWM outputs in same PIC. With 2 PIC's this might bee possible.

    If your system is so time critical that GOTO-command will...
  16. Re: 12F683, 12LF1840 - Port ON/OFF speeds are different!

    Would it be easier to do this with PWM module? With 32MHz you can reach 4MHz output frequency and accurate duty cycle.
    I think these PIC's have just one PWM module. If that is not enough, then...
  17. Re: 12F683, 12LF1840 - Port ON/OFF speeds are different!

    How about if you toggle pin in loop?


    HEAD:
    TOGGLE PORTA.2
    GOTO HEAD
  18. Replies
    7
    Views
    4,904

    Re: Nokia LCD - datasheet

    Use Google search and there you have it.
    Lumia 520 schematics

    Display is using MIPI DSI interface, so PIC's are not suitable for driving the display alone.
    In addition, you will need a SW user...
  19. Replies
    5
    Views
    3,827

    Re: How to receive and analyze text via SERIN ?

    Couple of years ago I had a similar problem/question.
    See this post. It might help you.
  20. Replies
    8
    Views
    4,995

    Re: Sorry, yet ANOTHER mod question

    Take a look to Voltage Divider Example.
    There is everything you need.

    10k and 3k3 doesn't give you 1:3 divider. Resistor ratio in your case should be 1:2 (e.g 11k and 22k).
    Link above explain...
  21. Replies
    8
    Views
    4,995

    Re: Sorry, yet ANOTHER mod question

    What kind of voltage divider you are using?
    If you try to get full 0-5V scale with 0-15V input, then you should use 1:3 ratio (e.g. 22kOhm and 11kOhm resistors) to get best measurement accuracy.
    ...
  22. Re: 18F4550 running 3.3V (serin2) and 16F877 running 5v (serout2), is possible?

    Sounds that you may have other problems than signal line and components between two PICs.
    - Power supply and de-couplings (internal noise)?
    - External noise coupling (shielding to transmission path...
  23. Replies
    20
    Views
    27,016

    Re: Pickit3 from Microcode Studio

    Thanks Henrik!

    It seems that GUI MPLAB's needed additional setting to power the target.

    Power -> Power Target Circuit from Tool (ICSP Options)


    Now it work like a charm.
  24. Re: 18F4550 running 3.3V (serin2) and 16F877 running 5v (serout2), is possible?

    I was already thinking the next generation version with both way communication (a step ahead) ;)
    2 diodes in series is a good solution!
  25. Re: 18F4550 running 3.3V (serin2) and 16F877 running 5v (serout2), is possible?

    See old Philips I2C application note AN97055, page 10 (Devices with different logic levels connected via the bi-directional level shifter).
    In addition what they propose, you can use e.g BS170,...
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