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volt.tech Latest Questions

vikas Nagpal
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vikas Nagpal
Asked: February 6, 2023In: Wireless Connectivity

Why ESP-32 Can Still Work after the Capacitor of the Crystal Oscillator?

  • 0

Hello, In the average assignments, the software controller chip outputs a high and low-level signal with a frequency of 100HZ at GPIO5. When we suddenly- circuit the load capacitance of the 40 MHz crystal oscillator, the output signal of GPIO5 changes ...Read more

Hello,

In the average assignments, the software controller chip outputs a high and low-level signal with a frequency of 100HZ at GPIO5. When we suddenly- circuit the load capacitance of the 40 MHz crystal oscillator, the output signal of GPIO5 changes to a signal of 10HZ- 20HZ, and the CPU seems to be working at a reduced frequency. What’s the reason? Why can the CPU still work?

I really appreciate any help you can provide.

Read less
capacitorcontrollercrystalesp32gpio5oscillatorsoftware
  1. Alex thomas
    Added an answer on February 7, 2023 at 10:03 am

    Hello, Yeah, do not do that, it runs the ESP out of specs and we can not guarantee anything wrt how it works in that case. For an explanation, I am just guessing then, but the CPU runs off the internal PLL. While that PLL uses the Xtal as a reference, it has its own VCO that gets tuned to run in synRead more

    Hello, Yeah, do not do that, it runs the ESP out of specs and we can not guarantee anything wrt how it works in that case. For an explanation, I am just guessing then, but the CPU runs off the internal PLL. While that PLL uses the Xtal as a reference, it has its own VCO that gets tuned to run in sync with the xtal frequency. Could be that shorting the xtal makes the VCO still run, but not veritably stably, and at the lowest frequency it happens to be suitable to reach, and that is what you see.

    Thank You

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  • 1 Answer
Answer
ashishgawade
  • 0
ashishgawade
Asked: November 24, 2022In: Wireless Connectivity

what I should use for Keyboard controller?

  • 0

Hello, I am in the process of learning my way around microcontrollers and designing an IOT device that will include a thumb keyboard. The font used will be an older one used on BBS systems and I envision holding control keys ...Read more

Hello,

I am in the process of learning my way around microcontrollers and designing an IOT device that will include a thumb keyboard. The font used will be an older one used on BBS systems and I envision holding control keys to utilize the upper area of the fonts for drawing.
As similar, I am aware that the esp32 lacks the pins demanded to program a keyboard so I am thinking a keyboard controller chip would be needed. Does anyone have a recommendation on what I should use?

I looked up many but they feel to be more fit for a laptop and apparently preprogrammed.

Thanks & Regards

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controllerdeviceesp32iotkeyboardmicrocontrollers
  • 0 Answers
Answer
vikas Nagpal
  • 0
vikas Nagpal
Asked: May 21, 2022In: Microcontroller

NMI pin interrupt

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How to configure the NMI pin interrupt for the Renesas RH850/F1KH controller?

How to configure the NMI pin interrupt for the Renesas RH850/F1KH controller?

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controllernmi pinrenesasrh850rh850 f1kh
  • 0 Answers
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