MxkA7yj

Optical Coupler Tester

Overview

This small optocoupler testing tool uses an NE555 chip to generate a PWM signal of approximately 2-3 Hz. A probe is applied to pins 1 and 2 of the optocoupler, and pins 3 and 4 receive the signal, causing an indicator light to flash. The entire tool has a simple circuit principle, few components, and uses a 5V Type-C interface for power supply, making it convenient and quick. During testing, use the probe with the circle on the circuit board to press against one pin of the optocoupler. A flashing indicator light indicates the optocoupler is good; no light or a constantly lit indicator light indicates a problem.

b016ff66cdead0b6a3256b3064c24956.mp4

PDF_Optical Coupler Tester.zip

Altium Optical Coupler Tester.zip

PADS_Optical Coupler Tester.zip

BOM_Optical Coupler Tester.xlsx

95344

STM32-based miniature table pet design

This design is a small desktop four-degree-of-freedom robot based on STM32F103C8T6.

In this project, I chose the STM32F103C8T6 development board as the main controller, paired with the NRF24L01 communication module, and charged via a Type-C interface.
My goal is to design a four-degree-of-freedom robot, making it a compact and portable desktop pet. This design concept aims to make our robot not only practical but also a companion for users, adding fun and entertainment.
For component selection, I specifically used plug-in components, a design that considers convenience, educational value, and maintainability for beginners. Plug-in components not only simplify the robot's construction process but also facilitate component maintenance and replacement. This design helps beginners better understand and master the robot's structure and gradually improve their overall understanding of electronic systems.
This project is designed with beginners in mind, striving to provide a user-friendly learning platform. By selecting the STM32F103C8T6 development board and the NRF24L01 communication module, we can not only achieve the project's goals but also provide a comprehensive learning experience, offering beginners ample opportunities to gain in-depth understanding of these technologies and acquire more practical experience.
Related reference video: https://www.bilibili.com/video/BV1Lj411H7x1/?share_source=copy_web&vd_source=3f844ddda93388504b96d0dae333dafd

STM32F103C8T6-based small desktop pet code.zip

STM32F103C8T6-based remote control code.zip

model file.zip

PDF_STM32-based Mini Tablet Pet Design.zip

Altium-based STM32 mini desktop pet design.zip

PADS_STM32-based Mini Tablet Pet Design.zip

BOM_STM32-based Mini Tablet Pet Design.xlsx

95345

electronic

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-28 13:32:45

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