51 microcontroller electronic keyboard design

Electronic keyboard design based on 51 microcontroller.

Schematic PCB

Open source audio amplifier

The power supply has a stable symmetrical +/- 40 V to ensure optimal performance.
Maximum power (THD 1%) approaches 100 W into 8 Ω load and 190 W into 4 Ω load (see measurements). All parts are through-hole, making it easy to build the amplifier. The design is completely symmetrical.

Schematic PCB

MSP430F149+1602 digital display and real-time clock

MSP430F149+1602 digital display and real-time clock

Schematic PCB

Single-chip wireless dual-display answering machine based on AT89S51 (with papers, circuit diagrams, and C language programs)

This design is a system built using AT98C51 microcontroller. The wireless answering terminal uses a combination of PT2262 transmit encoding chip + F05P transmit module (including thesis description, circuit diagram, and C program are complete)

Schematic PCB

Heart-shaped running water lamp program and circuit

Heart-shaped running water lamp program and circuit.

Schematic PCB

Xiaomi gravity sensor remote control

Xiaomi gravity sensor remote control (contains schematic diagram, code)

Schematic PCB

Intelligent non-contact infrared electronic thermometer with voice broadcast

The program is written in C language and contains MLX90614 temperature measurement, OLED driver, and 4004-8 voice chip driver. The entire system is user-friendly. The user can choose voice broadcast or OLED display, low temperature or over-temperature alarm, and forehead skin function. Conversion formula from temperature to real body temperature (the formula has been verified by actual measurements and has high accuracy). The entire system has been verified to be feasible, and the measurement results were compared with electronic thermometers on the market, with an accuracy higher than 98%.

Schematic PCB

Light cube production source code + schematic diagram

Light cube production source code + schematic diagram.

Schematic PCB

Design program of password lock based on microcontroller

51 microcontroller password lock LCD display

Schematic PCB

Nixie Tap: Minimalist Wi-Fi Nixie Clock

Nixie Tap is a compact and simple Nixie clock. It's powered via a micro USB connector, so you can power it from any USB port or an old phone charger. It also has Wi-Fi, so it can automatically synchronize with an NTP time server once connected to a wireless network. We made the Nixie Tap look good on our desks, and we hope it looks good on yours.

Schematic PCB

Small quadcopter DIY

IAP15W4K58S4-Small quadcopter DIY

Schematic PCB

51 microcontroller infrared decoding data + source code

51 microcontroller infrared decoding data + source code

Schematic PCB

Double self-balancing trolley

Double self-balancing trolley stm32

Schematic PCB

Simple and practical fully automatic hand dryer

The author has designed a circuit controlled by a microcontroller, and can easily create an automatic hand dryer with a commonly used hair dryer. In addition to the above functions, it also has flashing lights and crisp audio prompts.

Schematic PCB

100w stereo amplifier board DIY TDA2030 IC with transistor

This is a 100w stereo amplifier board. This project can easily play two 50w speakers.

Schematic PCB

NUVOTON Wireless Charging Reference Solution

Schematic PCB

MSP430 microcontroller controls tank target shooting C language source code

MSP430 microcontroller controls tank target shooting C language source code

Schematic PCB

WM8960 High-Definition Sound Card for Raspberry Pi

Schematic PCB

51 single chip electronic thermometer

51 single chip electronic thermometer

Schematic PCB

2018 Electronic Competition Question D-Gesture Recognition Device (Shandong University)

Schematic PCB