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Type: Posts; User: brunofunchas

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  1. Closed: Re: Measuring current with ESP32 and Seeed board

    Taking in consideration the comments I have layout a a circuit. That will give a 3,3V protection of the input? What should be the wattage of each device? And whats the best option of the NPN...
  2. Closed: Re: Measuring current with ESP32 and Seeed board

    Yes, I'm concern. But at the moment I cannot know the voltage spike that will occur. Perhaps a zener+resitor in parallel will avoid the voltage go above 3,3V?
    Perhaps, I will change my question to:...
  3. Closed: Re: Measuring current with ESP32 and Seeed board

    Sorry, perhaps I was misinterpreted! I was referring that the inrush current will induce a voltage greater than 3,3V at the input of the ESP32. I’m afraid of burning the microcontroller.
    I know that...
  4. Closed: Measuring current with ESP32 and Seeed board

    Hello!

    I have a project where I have to reads the current of a compressor. It has a nominal current of 4,5A and the maximum of the board is 5A:...
  5. Closed: Re: This is a simple capacitor or it has a resistor inside it?

    Thanks for the inputs. I will change it.
  6. Closed: This is a simple capacitor or it has a resistor inside it?

    Hello!

    I have the attached capacitor with HPF graved on it. When I measure with a multimeter, across the leads, it gives me 30ohms both ways. That means it is shorted or has a built in resistor?
    ...
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    Closed: 24Vdc Relay for a DC load of 2A 600V

    Hello!

    Is there any 24Vdc coil relay with a NC contact that can open a DC load of 2A 600V?

    I have search but could only find with NO!

    Thanks,
    Bruno
  8. Closed: Re: ESP32 Modbus RTU and measuring miliamp current

    Thanks,

    I'm going to look at it. I will have to hand soldering the PCB so i will look to other type of Package / Case.
  9. Closed: ESP32 Modbus RTU and measuring miliamp current

    Hi!

    Is it possible to use Modbus RTU directlly on the pins of an ESP32? Using arduino framework on VSC. Or should I use a MAX485?

    For measuring miliamp current in a 240Vac system can I use...
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    Closed: Re: NodeMCU ESP-32S pitch

    Hello!

    Thanks for the inputs! I have attached the photos of the board. Today, I could measure it with a paquimeter and it has 23mm between the two pin headers and 2,54mm pitch:

    154539

    I have...
  11. Replies
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    649

    Closed: NodeMCU ESP-32S pitch

    Hello!

    I have several ESP-32S NodeMCU boards. I'm going to design a PCB board to connect to it by SIL header blocks. These boards have a pitch of 2,54mm? And the distance from side header pins is...
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    Closed: Re: "Gold" pin

    Thanks Brian!
  13. Replies
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    Closed: "Gold" pin

    Hello!

    I have a PCB where one of the "gold" pins, that makes conection between two boards, broke. What's the name of it? Where can I find a spare one?

    Thanks,
    Bruno
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    [SOLVED]Closed: Re: RS232 - PIC sending data to PC

    Thanks for the reply! In fact the caps should be 1uF and not 100nF. I have changed them and everything is working fine. Sorry for my sloppy post about the waveforms.
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    [SOLVED]Closed: Re: RS232 - PIC sending data to PC

    Ok. Thanks for the inputs! I will post the waveforms. I have used, as a reference, the easyPIC v7 RS232 hardware schematic. The power supply is only based in 5Vdc. There is no negative reference.
    ...
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    [SOLVED]Closed: RS232 - PIC sending data to PC

    Hello!

    I have a simple project, where I have to send only some bytes to the PC, but I can not see them with realterm serial capture. With the oscilloscope Fluke 123 I can see that the TX pin is...
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    Closed: Going for GDD X or VTFT from Mikroc

    Hello!

    I have done some work, with MikroC, for 8bits from Microchip. Now I have a project, only two boards, where I have to use a touch panel of 7 inchs to interact with the MCU.

    I'm thinking...
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    Closed: Re: SPI with PIC16F887 and Proteus

    Hello!

    Thanks for the input! In fact Following your advise I have disconnected all of the outputs and only left the firt IC connected and it work fine. My problem is in fact that I have to daisy...
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    Closed: SPI with PIC16F887 and Proteus

    Hello!

    I'm trying to communicate with five SN74HC165 IC, by SPI, but the chips to not respond to the PIC18F887!

    I have seen the SPI debugger and the microcontroller reads zeros from them. On...
  20. Closed: Re: Electronics troubleshooting with PCB boards

    Thanks for the inputs!

    I have to work on the safe side since my compnay it is only me! I can not afford paying breaking down a machine!

    Just wanted to know if technicians swap electronic...
  21. Closed: Electronics troubleshooting with PCB boards

    I have situations in which I doubt if an electronic board is good on an industrial machine. Sometimes I have the possibility to test it on another machine, which is working well, to see if it's her's...
  22. Closed: Re: L4960 question - PTC fuse cuts the input voltage

    Thanks for the input. You are right, since I was looking to the table where we see the worst scenario for current and time.

    I have order this one:...
  23. Closed: L4960 question - PTC fuse cuts the input voltage

    Hello!

    I have an electronic board where the "fuse" X60X050( I think it is an 500ma 60V PTC) cuts out the supply to input pin 1 of an IC L4960.

    I have a peak current of 2,45A before it cuts out...
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    Closed: Re: C639 is a BC639 NPN transistor?

    Hello!

    In fact it was a NPN transistor since I came across another one with the same marking. Thanks fot the input on testing germanium transistor. I haven't seen them yet on a board!
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    Closed: C639 is a BC639 NPN transistor?

    Hello,

    I have a transistor with c639 marked on the body. I have seen on the internet and it indicates me that is a NPN transistor BC639, but when I measured it with my Peak Atlas DCA it says that...
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