Experimental Scenario 1 Introduction Recently, while reviewing exam papers, I encountered an innovative question based on photoresistors. Inspired by this, I decided to design a clever experiment using Phyphox and ESP32 to see if I could measure my own heart rate. 2 Design Idea Utilizing the combination of Phyphox and ESP32 to measure the resistance … Read more
The article about the module is about to begin, and I plan to write a series of beginner and intermediate tutorials on modules and STM32 in the future. Generally speaking, manufacturers of the ESP8266 module will periodically upgrade the firmware inside the module and release it, so we must also master the method of upgrading … Read more
Recently, I was inspired by the quality lesson activities conducted by the city’s backbone teachers at the school. During the listening and evaluation session, I managed to use Phyphox and ESP32 to jointly capture the current change images produced by the rotation of a small motor’s rotor, which was quite exciting. After building the experimental … Read more
Figure 1 Experimental Scene Recently, the author has been using Phyphox and ESP32 to capture the current changes when a light bulb is turned on. However, the current change at the moment the light bulb is turned on is quite rapid, making it difficult to draw an ideal current change graph. WeChat Official Account “Physics … Read more
Introduction On the third day of the Lunar New Year, we built an experimental circuit on a breadboard to “plot the I-V characteristics of a diode in the conducting state.” A programmable resistor board was used as the internal resistance of the ammeter, a potentiometer was used as a variable resistor to control the circuit, … Read more
Experimental Scene 1 Introduction Since learning Bluetooth communication with ESP32 and Phyphox during the National Day holiday in 2020, the author has been eager to solve the visualization problem of the relationship between capacitor voltage and charge, attempting to derive the charge amount by integrating the charging current, and then depict the charge-voltage relationship graph. … Read more
Raspberry Pi: GOIP Previously used a USB SIM800-like communication module, operated the serial port with Python after connecting to the computer. Subsequently used Raspberry Pi/ESP32 as the main controller. The open-source asterisk can not only serve as a VoIP server but also bridge PSTN for making and receiving calls and SMS messages. The customized system … Read more
This article is an excellent article from the Kx forum, author ID: wx_莫克斯 Preparation USB Protocol Specifications l USB UARTl USB HIDl USB Memory The one at the top is the standard serial port implementation, which can connect to MCUs like STM32 or ESP8266 via USB. The middle one can be used for BadUSB (to … Read more
Overall View of the Device Last time, when detecting the current changes before and after the rotor of the small motor got stuck using ESP32, the induced electromotive force when the small motor was driven by an external force was measured. However, the changes in electromotive force were too drastic, and the data jumps were … Read more
A Favored MCU – ESP32 ESP32 integrates 2.4 GHz Wi-Fi and Bluetooth dual-mode, using TSMC’s ultra-low power 40nm process, suitable for various IoT application scenarios. 32-bit MCU & 2.4 GHz Wi-Fi & Bluetooth/Bluetooth LE Xtensa 32-bit LX6 single/dual-core processor, computing capability up to 600 MIPS 448 KB ROM 520 KB SRAM 16 KB RTC SRAM … Read more