Every electronics expert has to have a test device called an oscilloscope in their toolbox. It can be used to view and analyze a variety of signals, and it is typically presented in the form of a two-dimensional plot in which one or more signals are plotted against time. In the process of designing and debugging electrical devices, they are utilized to view and compare waveforms, as well as determine the voltage levels, frequency, noise, and other properties of signals that are applied at the device's input as it varies over time. Because of this, oscilloscopes are a very useful instrument that should be kept on the workbench of each electronics expert or maker. Oscilloscopes, on the other hand, may be rather expensive, with entry-level models ranging anywhere from $500 to $2,000 in price. Because of their tens of thousands of dollar price tags, more complex oscilloscopes are out of reach for consumers with more fundamental needs. But what if we were able to design one that was simpler, smaller, and less expensive to produce? This is the question that prompted us to start working on this project today. ESP32 Oscilloscope Features

Single-channel 1 million samples per second, 50 thousand at 16 bits per buffer (50ms of data at 1Msps) Scale from 10 microseconds per division to five milliseconds per division @ 1 msps In 1X mode, the maximum VPP is 3.3 volts, while in 10X mode, it is 33 volts. Control that is both quick and responsive, employing tactile switches. Frequency calculations (20hz min due to buffer size) Simple mean filter ON/OFF Maximum, minimum, typical, and highest point Peak voltage The difference in time and voltage Analog, Digital/Data Mode Single TRIGGER AUTOSCALE Components Required to build ESP32-based Oscilloscope 1.69-inch, 240x280 Rounded Corner TFT display included with the ESP32 Devkit (ST7789s) Switches that can be felt. SHDT and SPDT switches 100K resistor 10K resistor 100nF capacitor Clad in copper or perforated board Soldering tools ESP32 Oscilloscope Circuit Diagram The data acquisition is controlled by an ESP32, which is employed in this application. When it comes to storing and manipulating the signals, we will

be using the I2S buffer that is built right in. In this example, the 38-Pin variation is used, however other types of development modules might be used instead. We are utilizing a 1.69-inch TFT display module as our means of display. The resolution of this device is 240 by 280 pixels. The display controller that we will be using is a ST7789S, and the SPI communication protocol will be used to control it. The module also has a slot for an SD card, however we haven't utilized it yet. In a future version, we might make use of this for waveform capturing or other applications along those lines. The keypad is a pretty straightforward device. For this particular reason, tactile switches that include pullup resistors are utilized. To identify each individual key press, we are making use of the hardware interrupt. This will provide us with a keypad that is incredibly responsive.

The analog input part is a rather straightforward component. It is made comprised of two SPDT switches, one for selecting the range, and another for selecting the AC/DC coupling. A voltage divider that can be used to feed signals with a peak voltage greater than 3.3V has been introduced by our team as part of the range selection process. This divider can be used to feed the signals. Signal will be converted to a 10:1 ratio after passing through the voltage divider. Arduino Code for Oscilloscope Download the complete source code from the GitHub repository hosted on the Circuit Digest website. You will also find an archive with the name TFT eSPI within the GitHub repository. In order to successfully drive the display, this modified library is required. It should be extracted into the

library folder for Arduino. In the event that the TFT eSPI library has already been installed, you will need to uninstall it before extracting the new version. When it is finished, go to the board manager and choose the esp32 option. After that, you need to compile the code and then upload it. Our do-it-yourself oscilloscope is now operational and ready for usage. The Oscilloscope can be powered by using the Micro USB port that is located at the bottom. This connector is used exclusively for supplying electricity. 485. DIY ESP32 Oscilloscope Every electronics expert has to have a test device called an oscilloscope in their toolbox. It can be used to view and analyze a variety of signals, and it is typically presented in the form of a two-dimensional plot in which one or more signals are plotted against time. In the process of designing and debugging electrical devices, they are utilized to view and compare waveforms, as well as determine the voltage levels, frequency, noise, and other properties of signals that are applied at the device's input as it varies over time. Because of this, oscilloscopes are a very useful instrument that should be kept on the workbench of each electronics expert or maker.

Oscilloscopes, on the other hand, may be rather expensive, with entry-level models ranging anywhere from $500 to $2,000 in price. In addition, more sophisticated oscilloscopes might cost a few thousand dollars, putting them out of reach for consumers with less sophisticated needs. But what if we were able to design one that was simpler, smaller, and less expensive to produce? This is the question that prompted us to start working on this project today. ESP32 Oscilloscope Features Single-channel 1 million samples per second, 50 thousand at 16 bits per buffer (50ms of data at 1Msps) Scale from 10 microseconds per division to five milliseconds per division @ 1 msps Maximum VPP 3.3V in 1X and 33V in 10X mode Control that is both quick and responsive, employing tactile switches.

Frequency calculations (20hz min due to buffer size) Simple mean filter ON/OFF Max, min, average and Peak-Peak voltage The difference in time and voltage Analog, Digital/Data Mode Single TRIGGER AUTOSCALE Components Required to build ESP32-based Oscilloscope 1.69-inch, 240x280 Rounded Corner TFT display included with the ESP32 Devkit (ST7789s) Switches that can be felt. SHDT and SPDT switches 100K resistor 10K resistor 100nF capacitor Clad in copper or perforated board Soldering tools ESP32 Oscilloscope Circuit Diagram The full circuit diagram for the ESP32-based oscilloscope may be seen in the next page. The data acquisition is controlled by an ESP32, which is employed in this application. When it comes to storing and manipulating the signals, we will be using the I2S buffer that is built right in. In this example, the 38-Pin variation is used, however other types of development modules might be used instead. The data acquisition is controlled by an ESP32, which is employed in this application. When it comes to storing and manipulating the signals, we will be using the I2S buffer that is built right in. In this example, the 38-Pin variation is used, however other types of development modules might be used instead. We are utilizing a 1.69-inch TFT display module as our means

of display. The resolution of this device is 240 by 280 pixels. The display controller that we will be using is a ST7789S, and the SPI communication protocol will be used to control it. The module also has a slot for an SD card; however, we haven't utilized it yet. In a future version, we might make use of this for waveform capturing or other applications along those lines. The keypad is a pretty straightforward device. For this particular reason, tactile switches that include pullup resistors are utilized. To identify each individual key press, we are making use of the hardware interrupt. This will provide us with a keypad that is incredibly responsive. You are able to acquire knowledge regarding the ESP32 Interrupts that we discussed previously.

The analog input part is a rather straightforward component. It is made comprised of two SPDT switches, one for selecting the range, and another for selecting the AC/DC coupling. A voltage divider that can be used to feed signals with a peak voltage greater than 3.3V has been introduced by our team as part of the range selection process. This divider can be used to feed the signals. Signal will be converted to a 10:1 ratio after passing through the voltage divider. Arduino Code for Oscilloscope You can obtain the whole source code by following the link provided at the bottom of this page, which leads to the Circuit Digest GitHub repository. You will also find an archive with the name TFT eSPI within the GitHub repository. In order to successfully drive the display, this modified library is required. It should be extracted into the library folder for Arduino. In the event that the TFT eSPI library has already been installed, you will need to uninstall it before extracting the new version. When it is finished, go to the board manager and choose the esp32 option. After that, you need to compile the code and then upload it. Our do-it-yourself oscilloscope is now operational and ready for usage. The Oscilloscope can be powered by using the Micro USB port that is located at the bottom. This connector is used exclusively for supplying electricity.