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Hi, I’m using an ESP32 controller, and I want to design the antenna on my PCB board, Can I get the antenna design details? Thank You
Hi, I’m using an ESP32 controller, and I want to design the antenna on my PCB board, Can I get the antenna design details?
Thank You
Read lessHello All, I’ve designed a very smooth and low ripple 5V force for my board. This gets coupled through an LDO 3.3 V controller to feed the ESP32 (same as most boards out there). When the ESP32 transmits WiFi, I see ...Read more
Hello All,
I’ve designed a very smooth and low ripple 5V force for my board. This gets coupled through an LDO 3.3 V controller to feed the ESP32 (same as most boards out there). When the ESP32 transmits WiFi, I see a 50- 100mV drop in the 3.3 V rail and it’s being coupled through to the 5V side of the 3.3 V reg.
Large electrolytic caps on the 5V side and the 3.3 V side bettered it greatly (to the 50- 100mV measured result) but I would like to see further improvements.
Most 3.3 V LDO regs all appear to have the same/similar load regulation characteristics so I’m not yet convinced a change in reg will resolve the issue. Having a 16-bit ADC on board means I’m very sensitive to voltage changes on the 5V rail.
Has anyone overcome this issue already?
Thanks
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It will not. Note that the 3.3 V LDO doesn't" regulate" its input voltage. The drop you see on the 5V side is the result of the ESP drawing more current during TX and the 5V supply/ rail failing to a) give that amount of current while maintaining 5V, or b) react to the change in current quickly enouRead more
It will not. Note that the 3.3 V LDO doesn’t” regulate” its input voltage. The drop you see on the 5V side is the result of the ESP drawing more current during TX and the 5V supply/ rail failing to a) give that amount of current while maintaining 5V, or b) react to the change in current quickly enough. There is nothing the LDO can do to change the current the load draws from the force.
So some options are
a) beef up the power supply
b) (further) reduce the impedance of the power supply (i.e. further caps), and make sure supply and ground/ return lines and connections have low resistance
c) consider decoupling only the sensitive circuitry (ADC,.) from the 5V supply, which may be easier to achieve (less current) than stabilizing the whole 5V rail.
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 lessHello, 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
See lessHello, 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
Read lessHow 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?
Read less
Hello, Here are some things to consider for designing an antenna on an ESP32 PCB board: 01. Determine the frequency range you need. The most common frequencies for ESP32 are: 2.4 GHz for WiFi 433 MHz for low-power communication 02. Decide what type of antenna you need based on your frequency range aRead more
Hello,
Here are some things to consider for designing an antenna on an ESP32 PCB board:
01. Determine the frequency range you need. The most common frequencies for ESP32 are:
02. Decide what type of antenna you need based on your frequency range and application:
A. For 2.4 GHz WiFi, a chip or PCB antenna would work well. Options include:
B. For 433 MHz, a simple wire antenna would likely suffice.
Hope this advice on ESP32 antenna design helps! Let me know if you have any other questions.
Thank You
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