2021 Question A-Signal distortion measurement device

Introduction: The second one from Xiaoguo has completed all the indicators of the question and expanded. MCU chose MSP432E401Y to commemorate the last electronic competition during the team’s undergraduate period.

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[Internet of Things] Hongmeng IoT Smart WIFI Switch

Introduction: Use the Hongmeng Hi3861 chip combined with the servo to realize intelligent WIFI remote control of physical switches in homes or dormitories.

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mi2s_mi2_esp32

Introduction: For Xiaomi Air Purifier 2 and 2S modified chassis

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Xiaoai Audio Play modified battery board

Introduction: Xiaoai Audio Play/Xiaoai Audio Play enhanced version, battery modification board.

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Mao_266 three-color ink screen_shell adaptation version

Introduction: Mao_266 three-color ink screen_shell adaptation version

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2.1 inch price tag temperature and humidity adapter board

Introduction: 2.1-inch price tag temperature and humidity adapter board bracket

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[Internet of Things] Hongmeng Internet of Things smart wifi switch +4254724A

Introduction: Using chip junction to realize remote control of physical switches in homes or dormitories

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usb power meter mini(power-s) optimized PCB version

Introduction: Main control: stm32f401cccu6 Screen: 0.96-inch st7735 Test: ina226 Type-C male and female splint 0.8mm or 1.0mm thickness is acceptable. When ldo is 20V, it can generate heat of more than 70 degrees!

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[5V input] Boost charging, can charge two series lithium batteries (8.4V) circuit

Introduction: Based on CS5090E two-cell lithium battery 8.4v charging circuit. It supports a maximum charging current of 1.5A, and the input voltage is 5V. It has a built-in adaptive loop that can intelligently adjust the charging current to prevent the adapter from being pulled. The output can match all adapters. Its rated operating temperature range is -40°C to 85°C

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Single cell 18650 battery charging circuit

Introduction: Single cell 18650 battery charging module. Low cost, simple structure and cheap price

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W806 main control ammeter

Introduction: W806, INA226, ST7735. Using lua, Hezhou Luatos can read voltage and current, 24pin full-featured C port

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[Internet of Things] Hongmeng Smart WIFI Switch +4238284A

Introduction: Hongmeng Smart WiFi Switch

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#The 7th Lichuang Electric Competition#Power consumption monitor

Introduction: The power consumption detector designed based on N32G430C8L7 and INA199A1DCKR can monitor the power consumption of low-power or high-power loads with a supply voltage of 1V-20V and a current of 0.1A-3A, or monitor the reverse current by switching the welding resistor.

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EFR32MG21 USB Stick

Introduction: The EFR32MG21 USB Stick reference design is a low-cost IoT gateway development kit that uses Silicon Labs' wireless IoT chip to implement the gateway function on a Linux host with a USB port.

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8266 to 485/232/TTL module

Introduction: Universal 1.5P shell 8266 or ESP32 module realizes serial port transparent transmission

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【LM3914】10 level display

Introduction: A simple LM3914 level display

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#The7thLiChuangElectricityContest#USB Ammeter

Introduction: It can measure USB charging voltage, current and power, and can also use the host computer to view and record the data.

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Dual-channel chip MAX232 level conversion solution verification version

Introduction: This project is used to verify the solution verification board design of the Lichuang mall level conversion chip RS232 (mall number C158068)

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Adaptive 4A lithium battery charger CN3791 MPPT solar panel charger high power charging board module

Introduction: MPPT solar controller uses CN3791 chip, has large charging current and is relatively cheap. I bought it on Taobao for 1.5 yuan each. All other components were used on hand. The PCB has been proofed and verified, so you can refer to it with confidence.

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XL4016 adjustable constant voltage and constant current experimental power supply

Introduction: This is an adjustable power module composed of Definitely do it.

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