Search found 87 matches

by jgustavoam
Wed Sep 09, 2020 2:02 am
Forum: ESP32 Arduino
Topic: Interfacing of ACS71020 using SPI
Replies: 3
Views: 263

Re: Interfacing of ACS71020 using SPI

Did you understand all about of this information? " The SPI frame consists of: • The Master writes on the MOSI line the 7-bit address of the register to be read from or written to. • The next bit on the MOSI line is the read/write (RW) indicator. A high state indicates a Read and a low state indicat...
by jgustavoam
Wed Sep 09, 2020 1:28 am
Forum: ESP32 Arduino
Topic: Interfacing of ACS71020 using SPI
Replies: 3
Views: 263

Re: Interfacing of ACS71020 using SPI

Hi Askhay, First, you must select the appropriate model for your option: ACS71020KMABTR-030B3-SPI (VCC = 3,3V and SPI interface). Maximum SPI Clock Frequency = 10 MHz (I suggest you do initial tests with 1 MHz) "It is recommended that the ACS71020 be the only device on the SPI bus if using SPI commu...
by jgustavoam
Wed Sep 02, 2020 10:23 pm
Forum: ESP32 Arduino
Topic: Best Frequency Meter ever made with ESP32 - awesome!
Replies: 9
Views: 774

Re: Best Frequency Meter ever made with ESP32 - awesome!

Hi don,
Very good! We are happy to know that the project works fine for you.
We are thinking of another method of measuring frequency - counting the duration time of each pulse (for low frequencies).
And then Dual Slope DVM.
Wait for it!
by jgustavoam
Thu Aug 27, 2020 11:38 pm
Forum: ESP32 Arduino
Topic: Best Frequency Meter ever made with ESP32 - awesome!
Replies: 9
Views: 774

Re: Best Frequency Meter ever made with ESP32 - awesome!

When I know ESP32, I saw that it had great potential! But due to the complexity of the resources, it takes time for us to learn how to use it!
by jgustavoam
Thu Aug 27, 2020 7:20 pm
Forum: ESP32 Arduino
Topic: Best Frequency Meter ever made with ESP32 - awesome!
Replies: 9
Views: 774

Re: Best Frequency Meter ever made with ESP32 - awesome!

PlusOrc,
You can test the frequency of mains, but the resolution is one Hertz.
Then you will certanly read 50 Hz in the USA! In my country Brazil, the frequency is 60 Hz.

You can also test the frequency meter with the project's internal oscillator. Make connection between GIPO_34 and GPIO_33.
by jgustavoam
Wed Aug 26, 2020 3:07 am
Forum: Hardware
Topic: How to measure a battery.
Replies: 3
Views: 361

Re: How to measure a battery.

Tommeyers se não quer ajudar, não atrapalha. Hi Jenya, If you are using the lithium ion battery to power the ESP32, you can measure the voltage at the battery poles. But don't connect directly! The input of the ADC pin is limited to 3.3 Volts. And the lithium-ion battery voltage can be up to 4.2 V i...
by jgustavoam
Wed Aug 26, 2020 2:40 am
Forum: ESP32 Arduino
Topic: I2S DAC overshooting signal form
Replies: 3
Views: 762

Re: I2S DAC overshooting signal form

Playing audio with 8 Bits DAC?
Of course, you are hearing noisy sound.
For audible audio, I suggest that you use at least a 12 or 16 bit DAC.
by jgustavoam
Sun Aug 23, 2020 4:03 pm
Forum: ESP32 Arduino
Topic: Frequency Measurement on digital input
Replies: 18
Views: 14175

Re: Frequency Measurement on digital input

Hi rodmcm,
The project does not need an LCD Display. This is optional.
You can see the frequency on the Arduino IDE console. And more, you can adjust the frequency of the oscillator to test it.
But you must connect GIPO34 to GPIO33 as indicated.
The ESP32 is incredible!
by jgustavoam
Sat Aug 22, 2020 1:36 pm
Forum: ESP32 Arduino
Topic: Best Frequency Meter ever made with ESP32 - awesome!
Replies: 9
Views: 774

Re: Best Frequency Meter ever made with ESP32 - awesome!

Hi Bobolink,
Test it and you will see how accurate the frequency meter is!
And you can calibrate too, changing the variable:
uint32_t sample_time = 1000000;
by jgustavoam
Sat Aug 22, 2020 1:27 am
Forum: ESP32 Arduino
Topic: Best Frequency Meter ever made with ESP32 - awesome!
Replies: 9
Views: 774

Re: Best Frequency Meter ever made with ESP32 - awesome!

As promised, this version has all been translated into English: The project: A high accuracy frequency meter using ESP32, without scales and showing up to 8 digits, measuring up to 40 MHz. Very stable. Optionally, you can test the frequency meter with internal oscillator. Caution = input signal to ...

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