4-digit voltmeter

Introduction: 4-digit voltmeter

Schematic PCB

Automatic drip irrigation control system based on MQTT protocol

Introduction: Since this work is still in the graduation project and is under undergraduate review this year, in order to avoid the trouble of unnecessary spot checks, the source code will not be open sourced for the time being. The automatic drip irrigation system is required to complete basic humidity collection, upload parameters to the IoT platform, and complete the watering action by receiving and processing corresponding instructions issued by the IoT cloud platform.

Schematic PCB

Simple R test circuit

Introduction: This project can measure resistance value, the range is 0-2M ohm, and the range can be automatically selected.

Schematic PCB

thermometer

Introduction: Display the recorded temperature and humidity meter through WIFI and mobile APP, using the XR3 WIFI smart module.

Schematic PCB

AS5600 magnetic encoder

Introduction: AS5600 magnetic encoder 3.3V application circuit, with reserved IIC, OUT interfaces and resistors for programming, welding as needed.

Schematic PCB

Ultrasonic distance meter based on STC microcontroller 4.17 modification

Introduction: Ultrasonic range finder based on STC8H1K16 microcontroller, HC-SR04 ultrasonic transceiver module and other components.

Schematic PCB

Microcontroller development board sensor pcb

Introduction: Join QQ group 375029515 to discuss technology

Schematic PCB

lock-in amplifier

Introduction: Lock-in Amplifier

Schematic PCB

[Guangdong University of Technology] Simple Amplifier

Introduction: A distortion waveform research device based on a triode amplifier that can measure input and output impedance, total harmonic distortion, etc.

Schematic PCB

Xinfeng magic reform

Introduction: Second magic modification based on Xinfeng portable PM2.5 detector

Schematic PCB

JOY 7307 multi-function calibration source-panel

Introduction: JOY 7307 multi-function calibration source - the One Piece Luffy avatar is added to the panel

Schematic PCB

joy6.5 Aegis panel

Introduction: joy 6.5 six and a half countertop panel

Schematic PCB

JOY 7307 multi-function calibration source-side panel

Introduction: JOY 7307 multi-function calibration source-side panel

Schematic PCB

Air pressure detection module based on LPS25HBTR

Introduction: An air pressure detection module is designed based on LPS25HBTR (C87898), which can actually measure temperature. I2C/SPI communication mode is optional.

Schematic PCB

ESP32 electronic load meter

Introduction: Multifunctional DC electronic load meter and voltage and ammeter based on ESP32 module

Schematic PCB

Simple electronic load

Introduction: A constant current electronic load built based on LM358 operational amplifier and TL431 reference voltage source

Schematic PCB

STM32 DC electronic load

Introduction: DC electronic load meter based on STM32 microcontroller to measure voltage, current and temperature and display it

Schematic PCB

ESP32 USB-V

Introduction: A USB voltage and current meter built based on ESP32-PICO-D4D, with high-precision voltage and current measurement, serial port download communication, PD protocol controller, QC deception and other functions

Schematic PCB

USB voltage and ammeter

Introduction: A USB current and voltage meter designed using STM32F103C8T6 microcontroller

Schematic PCB

Arduino PCB Heating Station

Introduction: Arduino NANO builds a PCB heating table and reflow soldering machine with temperature, voltage and current acquisition, adjustable constant temperature control display

Schematic PCB