A 3D printer control board based on ESP32This is a 3D printer control board based on the ESP32 microcontroller, which comes with built-in WiFi and BlueTooth.Current version: v0.5rev1 AUX1 adapter Fixes issue with AUX1 port on MRR ESPE v0.5This adapter board fixes MRR ESPE v0.5's issue with the TX/RX pins being swapped on the AUX1 connector. Simply use an IDC cable to connect AUX1_BRD to the AUX1 connector on the board. Then connect AUX1_SCRN to the screen (such as MKS TFT32). EXP3 to EXP1/2 adapterAdapter to allow use of RepRap full graphics smart controller This adapter allows the MRR ESPE to use generic LCD12864 controllers (officially the RepRap full graphics smart controller). To do so, connect EXP3_BRD to the LCD connector on the MRR ESPE. Then, connect EXP1 and EXP2 on the adapter to EXP1 and EXP2 on the controller. (Optional: Connect D5, D6, D7 to unused native ESP32 pins on the MRR ESPE, like IO2, IO4, and IO15. Then define `LCD_PINS_D5`, `LCD_PINS_D6`, and `LCD_PINS_D7` in `pins_MRR_ESPE.h`. The KILL pin is also optional.) If you want to use the SD card on the controller: 1. Remove SD_EN jumper on the MRR ESPE board.2. Use jumper wires to connect SCK, MISO, and MOSI from the adapter to the respective pins on the board.3. Connect SS on the adapter to IO5 on the board.4. Optional: Connect DET to an unused pin on the board. You will need to edit `pins_MRR_ESPE.h` to define the `SD_DETECT_PIN`.

Introduction:A continuity testing device is used to check the breakage and shortage of wires in a circuit. Sometimes in a complex circuit design, we are unaware of the fault so we have to test the circuit at every point to find the real problem. This plays an important role in designing of the electric circuit. It is always a good practice to verify continuity in a circuit before implementing it. In electric circuits, we use conventional bulky meters to check the continuity of a circuit. While working in a field, it is not possible to carry a bulky meter with the circuit. Here is a PCB device with a compact size of board and components on it that can check the continuity as well as the polarity of the components like diodes, Zener diodes, LEDs etc. It is important to place the components in right polarities otherwise placing the components in opposite polarities can damage the whole circuitry. You can carry it easily in your packet and can test your circuit anywhere.Working of the circuit:When you connect the component which you want to test with the PCB device continuity tester, both the LED will glow showing the activation of the circuit. There are two LEDs in a board performing different functions separately. LED1 will glow only when the wire of the circuit is connected to the cathode terminal of the diode.There are two transistors connected in the circuit which are not in phase with each other. This means that if one transistor will give high output then the other will give low output and vice versa. First LED will turn on when transistor one is on and second LED will turn on when the second transistor will turn on keeping the other low. When the component is placed between the wires to test the polarity it bypasses to the LED depending on the polarity as a result the current will start flowing current through the circuit. If no LED will glow this will identify that there is a short circuit at some place in a circuit.If the component is placed in a right polarity, then by placing the probes across the component in a circuit will sound the buzzer alarm. This will indicate that the circuit is in working condition or perfectly alright to implement. Using this PCB device you can check different types of circuits and components.Schematic Diagram:I have implemented the design on Altium designer. I have designed symbols and footprints for each component then I uploaded my symbols and footprints libraries online on Inventhub where users can view, download, or use them. Users do not need to design the components for their design. Thus, it can save time.After completing the design of components. I have used them in my schematic to complete my design. I have uploaded my schematic file for the users and viewers on Inventhub.PCB Design:After designing schematic, I have converted my schematic file to the PCB file so that I can design a board, connect my components, and can visually view my board in 3D. I have uploaded my PCB file on Inventhub where the manufacturer can view or download my PCB file for the fabrication.Design for Manufacturing:For the manufacturer, I have created a release of my project which contains all design files including schematic, PCB, and their component libraries. Instead of visiting my manufacturer, I can send him the release of my design files. He can view or download files in ZIP format and can fabricate my PCB without any errors.Bill of Materials:After getting my fabricated board, I need to embed components on it. I have created a BOM file on Inventhub which contains library reference, footprint, and quantity of each component. My component provider can simply download the file in CSV format and can send my components. I can calculate the total cost of my design by selecting the ‘supply chain’ option. I can select my distributor for the components depending on the price and availability of the components. Our total cost is $7.43.Feel free to ask queries at arshmah@inventhub.io

18 February 2020 EDIT: I just corrected a small mistake on the NRF24L01 part. Some small traces were missing. (Missing connections between CSN pins and MOSI pins.) I rotated the Main Board pins so that the Usb plug on the board is not facing the PS2 joystick.New Gerber file uploaded. This is a breakout board that can be used to replace the classical breadboard. Just solder the headers and place components on the board. Then connect the components using DuPont Cables. The breakout Board can fit the following components:1. Teensy 4.0 (including the bottom pins and ribbon cable connector)2. Teensy 3.23. Arduino Nano4. Arduino Pro Mini5. Arduino Micro6. Arduino Pro Micro7. STM32F103C8T68. LGT8F328P (Arduino replacement)9. Teensy Audio Adapter10. NRF24L01+11. MPU605012. PJ313B (TRRS 3.5mm Jack socket)13. 1206 package resistors14. 1206 package capacitors15. SOT23-3 parts16. SOT 23-5 parts17. SOP-16 parts18. TO-252-2 parts19. B103 volume potentiometer20. DPDT Switch21. Normal Button22. RJ45 socket23. PS2 analog joystick24. TP4056 charging module25. 0.96” Oled26. 2.42” Oled27. 3 mm Leds28. HC-05 Bluetooth

Development Board Series STM32F103RET6Resources on the board3.3/5.0/12V power input/output pinReset input/output pin (switchable)RTC power inputStandard digital IO*8Secondary digital IO*27 (Note: Secondary means may be reused and not used first)Analog IO*4I2C interface*1SPI interface*1&CS*3UART interface*2SD card interface*1 (SPI mode)SWD interface*1Type C (USB2UART interface, use Serial1) *1DC044 12V power interface*11.14" TFT LCD screen*1 (Connect with FPC0.5 8P upper connector)Normal button*3Reset button*112V power indicator *1USB connection status indicator*13.3V system power indicator *1Serial port indicator *4 (2 per group)Serial port line sequence exchange pin header * 2 groupsBOOT0 level switch pin header*1RTC power input selection pin header*1

Another board option ESP32S2ESP32S2 Module version

176Pin STM32H743/F767 core board (STM32H743Ix/STM32F767Ix), onboard 256Mbit (32MByte) 16-bit SDRAM and QSPI NOR Flash. It is convenient to evaluate the performance of F767/H743.Support STM32H743/F767 in 176Pin LQFP packageOnboard 256Mbit (32MByte) 16-bit SDRAMOnboard NOR Flash, use Quad-SPI interface for communication3 LED lights, one of which is a power indicator, the other two are available for users4 touch buttons, including a reset button and a BOOT mode switch button, the other two are available for use. The KEY_UP has a sleep wake-up function.Micro-SD card interface, using SDMMC 4bit bus communication 5V and 3.3V power supply pin headers are convenient for peripherals to get powerA dedicated LCD interface, designed to be compatible with most common small LCDs (available when SDRAM is not used) and dedicated parallel LCD modulesLead out all IO ports except NOR FLASH and SDRAM address line/control line.Micro-USB interface, with 1.5K pull-up resistor on DP. With 500mA overcurrent protection function.Reserved CR1220 battery holder pad for RTC power supplyDouble-layer board, conventional technology, effectively save the cost of proofing.All the components except for the CR1220 battery holder are on the front side, for SMT operation.

Same pin definition as the official board circuit, with slightly different layoutDevelopment board design based on ESP32-WROOM-32D (16MB)

ATMega2560 development board, full IO lead (including Arduino unused IO), onboard USB-UART conversion (CH340C), can be used as a general Arduino 2560.On the back of the board, the corresponding pin definitions in the Arduino are marked (x means that Arduinio is not used), as well as a comparison table of some communication interfaces.There are four LEDs on the board:One is the power indicator;Two are UART0 (PE0, PE1) indicator lights;One is the Arduino ancestor 13-pin (PB7) "L" light.There are three jumpers on the board (0603 0 ohms):Two are UART0 (PE0, PE1) of MCU to CH340;One is +5V to AVCC.Just connect it all.There are two optional resistors on the board:The pull-up resistor of IIC interface (PD0, PD1) is generally not connected.I added IIC completely because I personally prefer IIC and I use IIC for everything.

MODBUS RTC industrial control board/data access design idea: all MODBUS industrial control boards on the market only support coil input and output as IO expansion, and there is no one that can do data access records. Just before there was a project that required the register data to be written to the SD card, and the data monitored by the industrial control board should also be saved to the SD card. SD card data can be read or written through industrial control boards such as PLC, man-machine touch screen, etc. Similarly, SD card data can also be read or written via a card reader connected to a computer.Usage scenario: Example 1 monitors the number of times a host starts and stops on a certain day, saves it on the SD card, and facilitates future viewing. Example 2 Set the water level of a pump to 5 water levels, write the data to the SD card through the computer PC, and then read the data on the card by the industrial control board...1. The power supply on the board adopts 24V voltage, which is 90% compatible with the voltage of industrial control boards such as PLC on the market.2. Adopt RS485 communication and support MODBUS RTU protocol.3. There are 10 relay coil outputs, which can be used as PLC control IO output, touch screen coil output, etc...4. Coil, SD detection, data communication all have LED status indicator, the working status is clear at a glance.

Original intentionWe may move the development board around when we burn the program. Is there a way for us to make the development board able to burn the program wirelessly?For this reason, I found this wireless transceiver module on the Internet: LC12S!Module IntroductionUse standard TTL level UART serial portHalf-duplex communication, strong anti-interference ability2.4GHz ISM band, no application requiredMaximum output power 12dBm, receiving sensitivity -95dBm, transmitting working current 40mA @ 12dBm, receiving working current 24mA, sleep current 3.5uAWorking frequency can be set, multiple modules are frequency division multiplexed, and do not interfere with each otherCommunication protocol conversion and RF transceiver switching are completed automatically, users do not need to intervene, it is simple and easy to useCommunication rate 0.6kbps -38.4kbps, user can configure through AT commandLong transmission distance, up to 120 meters without interference in open areasSmall size SMD package, easy to install3D preview of the board:Recommended process of circuit boardSince the USB interface requires a thickness of 2.4mm, it is recommended to use the LC12S wireless transceiver module + gasket to export Gerber files. When ordering, choose a 1.2mm board thickness.Debugging methodAfter power-on, when the CS pin is connected to a low level, the SET pin is to set the parameter flag bit. Pulling it low or shorting to the ground can switch the module to the parameter configuration mode pin to set it. TXD and RXD pins Work at high level.Once in the setting state, the SET pin configuration must be low, the CS pin must be low, and the serial port settings must be data bit 8, baud rate 9600, parity bit N, stop bit 1, air rate 1Mbps .Data Format:Host sending: 0xaa + 0x5a + module ID + network ID (the ID of the transmitter and receiver must be the same) + 0x00 + RF transmit power + 0x00 + serial rate + 0x00 + RF channel selection + 0x00 + 0x00 + 0x12 (byte length) + 0x00 + Sum check byteE.g:Host sends: AA5A22331122000000040064000000120006Referring to the following data table, the above configuration parameters set the wireless module to:RF transmit power: 12dbmSerial port rate: 9600bpsRF channel: 100Module ID: 0x2233Sum check byte: 06Return data: AA5B22331122000000040064000000120007Please set the corresponding parameters according to your needs for specific valuesParameter setting table:Parameter configuration table:

This is a GPS positioning board based on EBYTE's E108-GN01 module design. Communication protocol: support NMEA0183 V4.1 and previous versions, the maximum fixed update frequency can reach 10HzFeatures: E108-GN01 is a multi-mode satellite positioning and navigation chip with high performance, high integration, low power consumption and low cost. It has small size and low power consumption. Targeting applications. And it provides software and hardware interfaces compatible with other module manufacturers, which greatly reduces the user's development cycle supportSupported positioning system: BDS/GPS/GLONASS/GALILEO/QZSS/SBASCommunication method: UART (TXD/RXD) or GPIOOfficial website link: http://www.ebyte.com/product-view-news.aspx?id=936PC download: http://www.ebyte.com/pdf-down.aspx?id=1656Indicator description:POWER: power supplyIPPS: Blinking successfullyV-RF: Active antenna power supplyTXD: data transmissionThe yellow satellite is Beidou, the blue satellite is GPS, and the place where the mosaic is placed is the latitude and longitude of the location. Using Google Earth, you can see that the accuracy is very high.http://www.ebyte.com/pdf-down.aspx?id=1656

Blynk Board is specially designed to work with the Blynk mobile app, for iOS or Android devices. Combining the Blynk Board with the Blynk app, you'll be able to easily complete a variety of Internet-of-Things (IoT) based projects: control LEDs from your phone! Wire up a door switch and receive phone notifications when it opens or closes. Plug a soil moisture sensor into a plant, and have it tweet at you when it's thirsty!

This design is a minimum system based on ATMEGA32U4 microcontroller (leonardo minimum system) . ATMEGA32U4 microcontroller is a more commonly used keyboard and mouse simulation chip, which can be used to develop custom keyboard and mouse, and can also be carried out like Arduino Micro series Development. This design mainly includes power supply circuit, crystal oscillator circuit, reset circuit, programming interface, micro data transmission circuit, and other peripheral auxiliary circuits. And all available interfaces are led out to facilitate development and design. This design is compatible with the Arduino Micro series development board, can achieve most of the functions, can develop a series of keyboards and mice, such as the commonly used 104-key keyboard, customized high-quality GH60 keyboard, and can also develop relatively unpopular arrangements, such as 96 Key, 87 key, 75 key, 64 key keyboard, etc. You can also customize the keyboard layout for development, and easy to program. The smaller size allows you to be more bold when developing!

PAM8610 is a 2*10W dual-channel class D power amplifier with high efficiency and low heat.The power input is DC5521 interface, 12V input voltage. (At least 12V2A)Audio input is a 327 audio interface and HX2.54-3p interfaceAdjust the volume through a 100K single potentiometer. Because the volume is achieved by voltage regulation. Therefore, the chip will not have any rustling sound of other input terminals to adjust the volume.There is a mute interface at the end of the board. An open circuit is a working state.

This development board leads to all IOs, with USB to UART0, onboard 3.3V output, can be downloaded automatically, and can be developed with arduino.

1. Module introduction:This module is the smallest system function board of STM32F103VET6. It integrates STM32F103VET6 minimum system circuit, 5V to 3.3V voltage regulator circuit, USB to TTL circuit, one-key download circuit for serial port, JTAG standard interface, LCD interface, OLED interface, SD card holder, buttons, status indicator and other peripherals. All GPIO ports of the MCU are led out (except PC14 and PC15), which is convenient for users to connect other peripheral modules.2. Product featuresSystem power supply: 5V (MiniUSB data cable is powered by P1 / P2)MCU: STM32F103VET6, LQFP100 package.FLASH: 512KB (large capacity product)SRAM: 64KBCPU frequency: up to 72MHzGPIO ports: 80 (78 leads out, PC14, 15 are not led out)Program download: One-key download of serial port + 20-pin JTAG interface downloadPower consumption measurement: can measure the power consumption of the entire system or only the MCUPeripheral interface: 2.8 / 3.2’LCD, 0.96’OLED (7Pin), SD card3 Module interface pin function table