EPROM Emulator is a tool that can temporarily replace an EPROM memory chip inside your "target" device. You can plug it into your computer and "upload" a new version of code in secondsImagine you are developing software (well, firmware more likely) and you need to change the “program” in your EPROM memory. That means, remove the EPROM from its host computer, subject it to 20-30min of UV light exposure, program it with EPROM programmer, and re-install it on the host computer. The entire process is extremely slow and has to be repeated every time you want to make even a tiny one-bit change! And yes, there are modern EPROM alternatives based on Flash technology, that could save you the 20-30 min erase time, but the rest of the process is still the same and still annoyingly slow if you’re writing code and trying to “debug” it. This is where the EPROM emulator comes in handy, a device that can temporarily “replace” your EPROM chip, it is controlled by a computer and can be reprogrammed in seconds. Once you finish testing you can replace the emulator with an EPROM chip programmed with the final version of your code.It's perfect for developing code for older 8-bit computers, Z80 "monitor" development etc. I even use it as a "universal" cartridge for my commodore 64.Links to the BOM from Digikey are posted on my GitHub, you can swap the hard-to-get 25LC512 EEPROM with CAT25512VI or M95512 but since those are only available in SMT you will need a SOP8-DIP8 adapter - all those are included in the Digikey BOM)Update (July 10 2022): uploaded new Gerbers for hardware version 2.2d (added support for the cheaper and easier to get DIP28 probe TLY 3100-28P)Update (Apr 10 2021): uploaded new Gerbers for hardware version 2.2 (minor changes to the schematic and PCB, just part designators updated)Update (Jan 23rd 2021): uploaded new Gerbers for hardware version 2.1 (changed from two small SRAM to single larger SRAM, firmware and software is the same)Update (Jan 10th 2021): uploaded new Gerbers version 1.9 (added pull up resistors to the EN_RST and WE signal to improve behavior when Arduino serial port opens)Update (Nov 18th 2020): uploaded new Gerbers version 1.8b

Overview:This project is inspired by Sean HodginsPiddyBOT. Based on Arduino Nano, this is a great project for students to start learning Control systems such as PID system. With the powerful support of Arduino, advanced Robotics enthusiasts can use the Wheel-E PCB to incorporate complex codes with closed loop system using encoders or the IR sensor slots.Supplies:Components needed:Wheel-E PCB x 1 (DM to Buy)N20 micro metal motors x 2MPU6050/9250 x 1Arduino Nano x 1TP4056 Battery charging Module x 1XL6009 Boost Converter Module x 1L293d motor driver x 2TactileSwitch x 210Kohm Preset x 35050 RGB led x 1Other miscellaneous resistorsI design my PCBs in Altium software (to download click here) .At the start you need to know which features you want to be in the PCB. I wanted this PCB to have Potentiometers for adjustment and tuning of PID algorithm in real time without changing the code every time. My design uses two motor drivers in dual channel mode to provide more current capacity to the motor.Features of this design include:Necessary passive components that'll be used for user interface.MPU6050/9250 is used for angle measurementL293D motor driver is used to control the N20 micro metal gear motors in Open loopconnections two IR sensors and two servos are also added for self stand-up of the robot.Peripherals for Bluetooth and OLED are also provided.TP4056 based battery charger module ( to charge the battery hence we wont have to disassemble the bot for charging)GenericBoost module to boost 3.7V of the battery to operable 5V.Buzzer for user interface.Buttons to set Zero and Reset the systemSpecifications of PCB:Size of the PCB is 77 x 94 mm2 layer FR41.6 mmImprovements :Self Stand up:Wheel-E provides slots for two Servo motor connections. These can be used to make Wheel-E stand from horizontal position on its own. Since the weight is less, small servos can be easily used for this Modification.IR sensor based Second Feedback:Two IR sensors can be connected directly on the PCB facing downward. These can be used as a second feedback to make the system closed loop and add potential of going forward and backward using external controller.Bluetooth Controller:Wheel-E has integrated slot for HC-05 bluetooth module that can be used to control the robot via smartphone using an app.Encoder-Motors:Encoded N20 motors can be used to make a complex yet fully precise two wheel balancing robot.

Under uploading.....Parts list[ESP12F/E] http://s.click.aliexpress.com/e/tYpdwzsk[ESP-01S (1MB flash)] http://s.click.aliexpress.com/e/_dVpczvG[SMD 0805 resistors] http://s.click.aliexpress.com/e/4hCSevX6[SMD 0805 capacitors] http://s.click.aliexpress.com/e/4gOb5eGu[AMS1117-3.3] http://s.click.aliexpress.com/e/25h0rqkC[Tactile Button] http://s.click.aliexpress.com/e/_d9EDTvG[2.54mm header] http://s.click.aliexpress.com/e/NN7BW6q4[SN74HCT125N] http://s.click.aliexpress.com/e/_dS1qzkw[SMD 10.5x10.5 1000uF capacitor] http://s.click.aliexpress.com/e/mcJVO79O[DC connector] http://s.click.aliexpress.com/e/lqaMrxXE[3 Pin screw terminal] http://s.click.aliexpress.com/e/_dTfgkpY[Fuse holder] http://s.click.aliexpress.com/e/_dYS2JQe[Fuse] http://s.click.aliexpress.com/e/_d81SmjG| Prefix | Value | Package || ------------- | ------------- | ------------- || R1 | 10K Ω | SMD 0805 || R2 | 10K Ω | SMD 0805 || R3 | 470 Ω | SMD 0805 || C1 | 100nF | SMD 0805 || C2 | 10uF | SMD 0805 || C3 | 10uF | SMD 0805 || C4 | 16V 1000uF | SMD 10x10 || U2 | AMS1117-3.3 | SOT223 || U1 | SN74AHCT125N | SOIC-14 || F1 | BLX-A Fuse holder | 5x20mm || DC_IN | DC adapter | 5.5x2.1mm jack || Button | Tactile Button | THT 6x6x14mm || Serial | 2.54mm 4P header | (optional) || LED | JST 3 pin female | WS2812b connector || LED | KF3.96-3P | screw terminal |http://s.click.aliexpress.com/e/tYpdwzsk

mXY Board - Low-Budget XY Plotter Drawing Robot BoardAbout mXY BoardMy goal was to design the mXY board to make low budget the XY plotter drawing machine. So I designed a board that makes it easier for those who want to make this project. In the previous project, while using 2 pcs Nema17 stepper motors, this board uses 2 pcs 28YBJ-48 DC 5V 4 Phase 5 Wire Stepper Motors. Also in the previous project, Arduino Uno R3 was used as microcontroller and Adafruit Motor Shield as motor driver. This board uses Atmega328P and ULN2003 stepper driver. So you will be able to make this project with a single board. A 5V 1A adapter or powerbank is sufficient for this project to power consumption. The maximum current was observed as 0.4A when both motors were running.The board shown in the video is the test version, the updated and upgraded version of the board is at the link below. Also, for those who do not want to solder, the mXY board will be sold at PCBWay Bazaar with all components assembled. Many thanks to PCBWay for this support.In this project we gonna make XY Plotter Drawing machine with mXY Board. With Drawing Robot you can draw images on wall, panel or A4 paper. You can print pictures or print text. The machine is a simple device, that draws picture using a normal pen, some motors and some string. All required hardware for this project are listed below. We will learn how to install and use the Polargraph program for drawing control.Required Components for PCB1x ATmega328P-PU with Bootloader: https://bit.ly/2U9iwJw2x ULN2003 DIP16: https://bit.ly/3dtexif2x 28YBJ-48 5V 5 Wire Stepper Motor: https://bit.ly/3gHHxVs1x CH340G SOP16: https://bit.ly/2TZXNaCType B USB Socket: https://bit.ly/2WBSQqwDIP Socket 28/16 Pins: https://bit.ly/2UahQDK12/16 MHz Crystal: https://bit.ly/33FNTyLL7805 TO-220: http://bit.ly/2N5WnYG10uF Capacitor: https://bit.ly/2U98JTU22pF/0.1uF/10nF Ceramic: https://bit.ly/2WCuQ6YLED: http://bit.ly/37OajhSResistor 10K/ 1K: https://bit.ly/2WFsNPlPower Jack Socket: http://bit.ly/2QAzFdp2 Pin Terminal Block: http://bit.ly/2lEgy58Male Pin Header: https://bit.ly/3ab5h0w2x JST B5B-XH Connector: https://bit.ly/2yXfJeI1x MG90S Servo Motor: https://bit.ly/2XWWytTGT2 Pulley 16 Teeth Set: https://bit.ly/36WfaykGT2 Rubber Belt (5M): https://bit.ly/2XTgbTT3 in 1 Jumper Wire: http://bit.ly/2J6de9ESoldering Tools: http://bit.ly/2PEiyVxConnectionsAn extension wire will be required for stepper motors and servos.5M Extension Wire Cable: https://bit.ly/3gMZMJaGondola & BracketYou can find gondola and stepper motor mounting bracket 3D models in the ZIP file 'Gondola_Bracket_Models'https://github.com/MertArduino/mXY-board-xy-plotter-drawing-machineSource Code-It works fine in Arduino IDE v1.8.5 & Processing v2.2.1-Download and install the Arduino IDE v.1.8.5 https://www.arduino.cc/en/Main/OldSoftwareReleases#previous-Download and install the Processing v2.2.1 https://processing.org/download/?processing-Download mXY-Plotter-Drawing-Machine https://github.com/MertArduino/mXY-board-xy-plotter-drawing-machine/archive/master.zipArduino Source Code-Go to the mXY-Plotter-Drawing-Machine\arduino-source-code-libraries\libraries folder.-Copy the contents of arduino-source-code-libraries\libraries into your C:\Users\YourPCname\Documents\Arduino\libraries folder.-Go to the mXY-Plotter-Drawing-Machine\arduino-source-code-libraries folder.-Copy the polargraph_server_a1 folder and paste it your C:\Users\YourPCname\Documents\Arduino folder.-The "polargraph_server_a1.ino" file is the edited copy for the ULN2003 driver and 28YBJ-48 stepper motor. You can get the original version here https://github.com/euphy/polargraphcontroller/releases/tag/2017-11-01-20-30-Open Arduino IDE-Go to File -> Sketchbook -> polargraph_server_a1 | Open the polargraph_server_a1 source code.-Go to Tools -> Board -> Arduino/Genuino Uno | Select the Board-Go to Tools -> Port -> COMx | Select the Port-Press the "verify" button in the toolbar to try and compile it.-If it compiles, press the "upload" button in the toolbar to upload it.-Once you do that, you should confirm that it is working properly - use the serial monitor on the board, set to 57600 baud to make sure that it is issuing "READY" every couple of seconds.Processing Source Code-Go to the mXY-Plotter-Drawing-Machine\processing-source\Processing libraries folder.-Copy the contents of processing-source\Processing libraries into your C:\Users\YourPCname\Documents\Processing\libraries folder.-Copy the polargraphcontroller folder and paste it your C:\Users\YourPCname\Documents\Processing folder.-Open Processing-Go to File -> Sketchbook -> polargraphcontroller | Open the polargraphcontroller app source code.-Press the Run button in the toolbar to run the sketch.polargraphcontrollerStepper Motor Specifications-Press the SETUP button in the toolbar.-Define the value for MM PER REV as 64-Define the value for STEPS PER REV as 4076-Define the value for MOTOR MAX SPEED as 1000-Define the value for MOTOR ACCELERATION as 200-For more information about 28BYJ-48 Stepper Motor https://lastminuteengineers.com/28byj48-stepper-motor-arduino-tutorial/Machine Dimensions-Remember that your machine size is NOT the same as your surface size.-Your PAGE or drawing AREA size will be smaller.-Machine Width - This is the distance between two closest points on the sprockets (between two pulleys). Adjust the size between two pulleys on the Machine Width-Machine Height - This is the distance from the sprocket axis to bottom of your drawing (board) area. Adjust the Machine Height (height between the pulleyand the end of the panel)-After machine dimensions, adjust the size the area you will draw. (If ou will draw on an A4 paper, set the A4 size.)-Home Point - This is a magic point marked on the centerline, exactly 120mm (12cm) down from the top edge of your machine.-Then, first clicthe Center Page and then set the Page Pos Y value 120.-Secondly click Center Home Point and set Home Pos Y value 120.Servo motor (Pen) settings-Pen Up Position and Pen Down Position values are the operating angle of the servo motor.-Click Serial Port and select Arduino's port from the list of connected devices.-When the correct port is selected, the 'No Serial Connection' display will turn GREEN and the port number to which it is CONNECTED will be displayed.-Click on 'Command Queue' and command transmission is activated.-Click Upload Lift Range, then click Test Lift Range and test the servo motor angle.Last Settings - Upload vector image and start the print-Save your setting. Load your setting every time you turn on the program.-Click the Input tab and switch to the main screen of the program.-Then we will anually set the gondola for 'Set Home' manually. Move the gondola by manually and move it to the previously defined home point. The gondola must be adjusted this way before each drawing before clicking 'Set Home'.-After this adjustment is done, Set Home and Set Pen Position are clicked.-Click Set Area to specify your drawing are. Then click Set Frame to Area to make all necessary settings for drawing.Draw Vector-Find any vector drawing image. Convert image to the SVG format from any converter platform.-After select Load Vector from program. Adjust image size with Resize Vector. Move the image to the desired area with Move Vector. Then adjust the area to be printed with Select Area and Set Frame to Area.-Finally, click the Draw Vector command to start the machine.

Tapecart MICRO SD Tapecart MICRO SD is a, easy to use, Commodore 64 Loader, from a standart MICRO SD Card. Tapecart MICRO SD loads software from C64 cassette port rapidly. You can only load games/programs with .PRG and .TCRT extensions.This is a tested and working circuit.Using Tapecart MICRO SD:You only need to download browser.prg from the source page and save it in to MICRO SD Card with your favorite games and programs. Then Press "SHIFT"+"RUN" from your Commodore 64 keyboard.Download Link for Arduino hex file and prowser.prg:https://github.com/KimJorgensen/tapecart/releasesArduino pro mini 5V 16MHZArduino .HEX file from the source page https://github.com/KimJorgensen/tapecart/releases4N25 or 4N27 optocoupler330 Ohm 1/4 watt resistance6 pin MICRO SD Card Module ( Please look at the image )2x6 pin 3.96mm Pitch Card Edge ConnectorBefore soldering MICRO SD card module you should place some isolation tape between PCB and SD card module.Thanks to Kim JorgensenYou can find normal (not micro) SD CARD version from this link:https://www.pcbway.com/project/shareproject/Tapecart_SD_is_a_Easy_to_Use_Commodore_64_SD_Card_Loader_.htmlIn order to protect your electronical devices, always turn off your Commodore 64 before connecting or unconnecting any device.Ps. While transfering data (reading or writing) from SD cards it should not be interrupted like power-off or Reset systems. Otherwise that may damage SD cards.Gerber files can be changed at any time. Before paying for the PCBs, be sure to update your orders!Have FunThank you.

If you are planning to install an off-grid solar system with a battery bank, you’ll need a Solar Charge Controller. It is a device that is placed between the Solar Panel and the Battery Bank to control the amount of electric energy produced by Solar panels going into the batteries. The main function is to make sure that the battery is properly charged and protected from overcharging.As the input voltage from the solar panel rises, the charge controller regulates the charge to the batteries preventing any overcharging and disconnect the load when the battery is discharged.Types of solar charge controllersThere are currently two types of charge controllers commonly used in PV power systems :1. Pulse Width Modulation (PWM) controller2. Maximum Power Point Tracking (MPPT) controllerIn this tutorial, I will explain to you about the PWM Solar Charge Controller. Specification1.Charge controller as well as energy meter2. Automatic Battery Voltage Selection (6V/12V)3. PWM charging algorithm with auto charge set point according to the battery voltage4.LED indication for the state of charge and load status5. 20x4 character LCD display for displaying voltages, current, power, energy, and temperature.6.Lightning protection7.Reverse current flow protection8.Short Circuit and Overload protection9. Temperature Compensation for Charging10. USB port for Charging GadgetsBuild InstructionInstructables : https://www.instructables.com/id/ARDUINO-PWM-SOLAR-CHARGE-CONTROLLER-V-202/My Website: https://www.opengreenenergy.com/post/arduino-pwm-solar-charge-controller-v-2-02How the Circuit Works ?Note : Red Line - Power and Yellow Line - Control SignalThe heart of the charge controller is an Arduino Nano board. The Arduino senses the solar panel and battery voltages by using two voltage divider circuits. According to these voltage levels, it decides how to charge the battery and control the load.Note : In the above picture, there is typographical error in power and control signal. The red line is for power and yellow line is for control signal.The whole schematic is divided into the following circuits:1. Power Distribution Circuit:The power from the battery ( B+ & B- ) is step down to 5V by the X1 ( MP2307) buck converter. The output from the buck converter is distributed to1. Arduino Board2. LEDs for indication3. LCD display4. USB port to charge gadgets.2. Input Sensors:The solar panel and battery voltages are sensed by using two voltage divider circuits consisting of resistors R1-R2 & R3- R4. C1 and C2 are filter capacitors to filter out the unwanted noise signals. The output from the voltage dividers is connected to Arduino analog pins A0 and A1 respectively.The solar panel and battery currents are sensed by using two ACS712 modules. The output from the current sensors is connected to Arduino analog pin A3 and A2 respectively.The battery temperature is measured by using a DS18B20 temperature sensor. R16 (4.7K ) is a pull-up resistor. The output of the temperature sensor is connected to Arduino Digital pin D12.3. Control Circuits:The control circuits are basically formed by two p-MOSFETs Q1 and Q2. The MOSFET Q1 is used to send the charging pulse to the battery and MOSFET Q2 is used to drive the load. Two MOSFET driver circuits are consist of two transistors T1 and T2 with pull-up resistors R6 and R8. The base current of the transistors is controlled by resistors R5 and R7.4. Protections Circuits:The input over voltage from the solar panel side is protected by using a TVS diode D1. The reverse current from the battery to the solar panel is protected by a Schottky diode D2. The over current is protected by a fuse F1.5. LED Indication:LED1, LED2, and LED3 are used to indicate solar, battery and load status respectively. Resistors R9 to R15 are current limiting resistors.7. LCD Display:An I2C LCD display is used to display various parameters.8. USB Charging:The USB socket is hooked up to 5V output from the Buck Converter.9. System Reset:SW1 is a push button to reset the Arduino.

Kawaii means cute in Japanese we based this project on KawaiiTech logo. This pendant is so cute, easy to assemble and re-program which makes it totally customizable, it can be worn as pendant or even earrings. We liked black solder mask with HASL finish, maybe you wanna rock ENIG?The board is based on ATTINY85 charlieplexing 6 LEDs and powered by a CR1220 battery. BOM:1 ATTINY85 SOIC 86 0805 LEDs we recommend ultra bright1 cap 0805 0.1uF1 CR1220/12225 battery holder, footprint is made for 2894 but should also work with S8201-46R.1 Switch CUS-12TBYou can generate an Arduino Project and use Arduino UNO board to program it. Or if you have the ICE Atmel programmer use the on board footprint.https://www.youtube.com/watch?v=Bx5GLyJSWPk

This SDR was designed from some of my experiments so far, from various sources with improvements here and there so that I can get maximum results.LO using Si5351A which is controlled by Arduino Nano produces a frequency that is wide enough Max 160Mhz, of course allows us to make Exciter up to 10M band. LO = work freq x 4.My BPF takes from the us5ncj design using an already-built Inductor, so it is practical without the need to roll.Parts of TX, RX, and RF Preamp are not much different from the SDR series in general such as Avala, Mchf, tulip and others. Only, I choose which is easy, simple, and the results are maximum.RF Power Amplifier is intentionally not in this Kit, you can combine it with any RF Power. And the output of this Exciter is quite small at 10-50mW. In practice, you can use the former RF PA FT-80C, FT-180A or the other.https://www.ye3cif.com/lmr-sdr-transceiver-10-160-meter-band/

### OverviewThis project is an IO board for controlling model railroad layouts. It drives model railroad peripherals such as turnouts, signals, pushbuttons, block detectors, etc, and uses the NMRA standard LCC connection via CAN-bus to control and interact with other peripherals or a computer.The IO board does not contain a microcontroller. It needs an STM32 Nucleo-64 board plugged into it to operate. The following boards are tested:- Nucleo-F091RC with 256K flash and 32K ram- Nucleo-F303RE with 512K flash and 80K ramDesigned for, but untested with- Nucleo-F446RE- Nucleo-F767ZI with 2M flash, 512K ram and ethernet (this is larger and needs modification).### DESCRIPTIONThis is a dev kit based on the STM32 Nucleo processor board, which is inexpensive, and compatible with both Arduino libraries as well as OpenMRN. The processor boards come with various chips, and a number of them have plenty of flash and RAM available for advanced functionality -- 256K to 2M of flash and 32K to 512K of RAM is available in the $11-$24 price range.I stuffed a number of peripherals onto the Dev Kit, expecting that different users will populate whichever and however many they want from these. The total list is as follows:- 16 input lines (active low) for buttons or block detectors; screw terminals or 10-pin ribbon cable (selectable).- 8 lines for driving 4 tortoises, 8 medium-current 12V outputs, or 8 high-current 12V outputs (depending on driver chip populated). Screw terminals or ribbon cable.- 16 additional output lines with four different options: * direct LED drive at 5V with slots for current limiting resistors (both CA and CC supported) * high current low-side switch for snap switches, structure lighting, or CA LEDs (multiple series LEDs supported) * high-current high-side switch for snap switches, structure lighting, or CC LEDs (multiple series LEDs also supported) * very high-current low-side switches for... not sure what -- but these are harder to solder.- 8 servos driven directly from the board; up to 2 amps of 5V rail available for the servos- expansion ports for I2C and SPI daughterboards. As an example, this board can be wired to it to add an additional 32 I/O lines (bi-directional/selectable). But boards based on the PCA9285 can be added to drive 16 servos each, etc.The OpenLCB related features are as follows:- CAN-bus port (of course)- Local power supply input via jack or screw terminals- Supply power to the bus, local supply, or take power from the bus -- jumper selectable. With proper jumper setting no automatic switchover happens so no brownout of the bus in case the barrel jack comes loose.- DCDC switcher to convert from bus voltage to 5V; 500mA or 2A capacity.All the IO chips are through hole and can be made socketed; thus replacing faulty or damaged components is possible for $0.4 instead of tossing the whole board. Building the board with average soldering skills is possible if somebody wants to save on costs.### TECHNICAL DETAILS / COMPONENTSThis pre-compiled basket contains the components needed for 5 boards fully populated with all alternatives:http://www.digikey.com/short/jm34c7Depending on the desired population, some of the alternatives should be removed from the basket before ordering!Almost all components are available in through-hole form. Some components can be populated either via through-hole or via SMD alternatives. Make sure you adjust the purchase basket accordingly.### LEARN / TOPIC / BUILD INSTRUCTIONSMore info: https://sites.google.com/site/balazsracz/nucleo-io-boardSchematic: https://drive.google.com/file/d/1Ak-stx7NbY1LWwHgUYtzf3kkMfKB_b9X/view

The PCB gerber submitted is a new design for the prototyped circuit we have made for a hackathon. Here is its description.## InspirationAs more and more people have been working from home, the problem of natural lighting has been growing. During the pandemic, we personally experienced this issue because we lived in rooms where sunlight was scarce. The constant intensity and hue ceiling light made motivation very dull.## What it doesWith our custom code, the kit fetches the time from an NTP server and drives an LED strip at the corresponding intensity and hue of light.## How we built itUsing an ESP32, we fetched GMT time from a NTP Server, adjusted GMT time to local time zone, converted current time into an LED intensity value. The LED intensity was driven by adjusting the PWM duty cycle on the MOSFET driver and we simulated the MOSFET to make sure it can switch up to 10kHz which is the max PWM frequency of the ESP32. ## Watch our Presentation and Demo!https://docs.google.com/presentation/d/1mi4-n4dT8bwS4iG0mJ9_k5yZCrY3XL1ln9aOi6mdWBc/edit?usp=sharinghttps://youtu.be/3wxxrmfImcg

captain-amygdala/pistorm is licensed under theMIT LicensePermissions Commercial use Modification Distribution Private use pistorm by captain-amygdala(A 68000 CPU replacement) 4 layers PCBFile name: PistormRevB_PCB_FAB.zip Project information: The PiStorm itself is an adapter board intended to be paired with a Raspberry Pi Model 3A+. It goes in the DIP socket on and acts in place of the CPU, but functionality can be extended beyond simple CPU emulation.IMPORTANT NOTE: Selling blank or complete PCBs or derivatives on eBay or elsewhere for excessive profit is frowned upon and may lead to forthcoming related projects being closed source.https://hackaday.com/2021/04/19/pistorm-brings-modern-muscle-to-the-amiga/https://github.com/captain-amygdala/pistormhttps://github.com/captain-amygdala/pistorm

Watch the video on the build here:

ESP32 based dev board with the onboard motor driver, over current and reverse voltage protection for embedded and robotics application.Project description:SRA board is an ESP32 based development board which having the following features:1) 2 x TB6612FNG motor driver (total 4 Channels for the motors)2) programmable switches and LEDs (4 Switches and 8 LEDs)3) Sensor port for custom IR sensor and MPU60504) LM2576 Buck circuit to convert 12V to 5V.5) AMS1117 to convert 5V to 3.3V for sensors.6) Over-current protection by fuses and Reverse voltage protection by P-MOSFET.7) Simultaneous power to ESP32 via Vin and USB using Diode Auctioneering concept.https://github.com/SRA-VJTI/sra-board-hardware-design

(DIY) 9PIN JOYSTICK TESTER for COMMODORE and ATARI with TWO FIRE BUTTONSThis is a tested and working circuit board.LEDs can be soldered from two sides. Please look at the pictures. This may help for easier boxing.Second fire button is connected to DB9 pin9Gerber files can be changed at any time. Before paying for the PCBs, be sure to update your orders!Have funThank you.COMPONENTS:6 pcs. LED (You may use "common anode 3 pin two colour led" for 2 fire buttons LEDs)D-SUB 9 Pin Male Right Angle ConnectorCR 2032 or CR 2025 3V Lithium BatteryCR 2032 Battery Holder150 Ohm 1/4 watt Resistance (Resistance value changes LEDs brigtness)

this is a simple arduino game console, based on the arduboy, designed for people to just get the componets needed, solder them to it, add the games and have fun, or learn to program on c++ games for it, it's a really fun and challenging activity that can help improving programming skills or being an entrance point for childs into this activityi made it as simple as i could, it can be used without the W25QXX module, only having one game at the timefor the module to work you need to burn an special bootloader (cathy 3k) to the pro micro, and upload an sketch to it, all of this can be found on the arduboy forums (mrBlinky was the creator of those)also i really encorage you to get an official arduboy in case you're interested and can do itfor any question my instagram is forge.carvings.and.morei'll be happy to help as much as i can