ESP32-S2 development board.Tested:0.96" IPS display#CircuitpythonArduino IDEDFU BootloaderThanks @adafruit for great work!Simplified Metro board. https://www.adafruit.com/product/4775DISPLAY:#define TFT_CS 7#define TFT_RST 5#define TFT_DC 6

STAY TUNED I WILL PERNAMENTLY UPDATE DESCRIPTION 1. WARNING !Not working on coins, need COIN BATTERY !2. WARNING !EXTREMELY SIMPLE !!!! only 4 COMPONENTS = Atmega328+LED matrix+speaker+Buttons3. WARNING !Arduino compatible source codeGames:pongfalling starsinvadessnakebreakoutcar racetetrisjump arcadeFeatures:Single atmega328, arduino codeDirect driving matrixPiezo speakerCR2032 battery power aka COIN :)3 Buttonsred, green or blue matrixscore countingsome voices (Talkie library)SCHEMATIC IS IN GALLERY :)SOURCE code on GITGUBI am not author of games, just hardware designer. I glued games from internet, modify them to work with direct driven matrix, add sounds&voices, graphics, power management

12.11.2020 - updated revision to FUSION 3 ....display in middle27.12.2020 - Removed hackaday logoMain board you can order here:https://www.pcbway.com/project/shareproject/ARMACHAT___Doomsday_LORA_QWERTY_communicator.htmlProject page:https://hackaday.io/project/171790-armawatch-armachat-long-range-radio-messengers

Intro:For quite some time I was working on an educational robot. Thanks to Leaf Award I started working on Robot Cing (https://hackaday.io/project/93532-robot-cing-educational-robot-for-everyone). Unfortunately, it is still not done because I keep finding things that can be improved and I am writing manual where programming would be explained as well as basic hardware functions. In the meantime, I created this adapter board which currently allows you to connect Lego EV3 color sensor as well as a button to Arduino using I2C. The address of every sensor can be set without flashing a new program into the board. In the future, I want to add a Lego EV3 ultrasonic sensor and IR sensor support. Also, NXT sensors should be possible to implement but I do not have them so currently, I am unable to develop code for them. I used 2 Arduino nano board which I had at home.My story:During many years which I am learning robotics I used multiple platforms. I started using Lego NXT later upgraded to Lego EV3 and finally switched to Arduino and Raspberry pi. Many people think that switching from Lego to Arduino is easy and when they try to do it they fail miserably due to lack of understanding of hardware as well as new programming language (typically C/C++). Worst thing is that they buy expensive hardware like motors and sensors even though they already have them and used them in the past(I am talking about Lego sensors and motors). Using this hardware has many advantages for beginner over buying something else. Firstly it is much cheaper because you do not have to buy everything. Secondly it is easy to build on (everybody can build a robot from lego but not everybody knows how to use CNC router or lathe or 3D printer to create parts that can be assembled). And last but not least Lego most lego sensors are pretty good at job they are supposed to do ( I would say only exception is Gyro which isn't as good as MPU6050 :D ). Only problem was that nobody that I could find was able to connect them to Arduino and write some code to read them. So one day I decided to hack them using logic analyzer and research from internet. I had sensors at home and logic analyser as well so only question that remained was how long would it take. It turned out that about ten to fifteen hours was enough to determine their pinout, interfaces used (I2C and UART) and figure out their protocol. I used them in my robots for some time but there was a problem. You have to send them an acknowledgement bit every 300ms which is hard to do if you are a beginner, so I decided to build board with atmega328 which would handle data reading and would act as sensor over I2C. Its address would be changeable by user in order to connect more then 1 sensor only. Currently I did not publish PCB design because I wanted to test it but here are two links which helped me the most (https://www.dexterindustries.com/wp-content/uploads/2014/05/Breadboard-Adapter-Sensor.gif, https://www.wayneandlayne.com/bricktronics/design-and-theory/). Current stage:Currently I am still waiting for PCBs from china so demo videos are made using two Arduino nano boards. First Arduino nano handles communication with sensor and sends acknowledgment bit every 300ms. In final product this would be handled by Lego sensor adapter board. Second Arduino can read data in anytime using I2C and it can also set multiple sensor modes if sensor supports it. I2C address of every sensor module can be set without flashing new program using jumper Addr and second Arduino. Library for this sensor is already created by me and approved by Arduino IDE (https://github.com/StanislavJochman/LegoSensorAdapter).Future:In the future I would like to create similar board which would use I2C to control EV3 motors with encoder feedback. I would like to opensource this project when it is done as well as create tindie store for it where beginners could buy preassembled PCB for Lego sensor and motor adapter. I would like to create video manuals as well as paper manuals for these boards.Updates:I will update this post when I will assemble PCBs.Video:https://youtu.be/leZQ1gBrtHU

https://atariage.com/forums/topic/308771-1mm-ffc-keyboard-cable-and-adapters/original Atari flat cable was broken

Great SSR protection for your power amplifier.

This is 4 port USB to UART converter with chip FT232RL with USB hub FE1.1S. Logic level for FT232RL is 1.8V, 3.3V and 5V. Board have 4 separate jumper, for disable any UART channge. Using jumper is possible disconnect power supply for any channel. It's a great extension to remove a lot of cabling from the table. All you need is one PCB, and you have 4 USB to UART converters on the table.Schematic, PCB designe and more is on the my github repository.

This is home-made solder paste dispenser. Construction is printed on the 3D printer. The PCB is based on the basic connection of arduino nano with ULN2003 for stepper motor, and any button. The buttons are for controlling the direction of rotation of the stepper motor, and for changing the speed of rotation of the motorMechanical material3D printed PCB Stepper motorSchematicAll project data with source code is on the my github repository.

For hex to atmel contact me to info@wifi-media.sk

Development board contains these parts: I2C OLED,RTC,IR RX-TX,Bluethoot hc05 module, Rele, usb-uart ch340g.Compatible arduino uno pins.More here:https://hackaday.io/project/171079-devilo-pic-board Test DS1307 and OLED menu

Experience freedom of communication without borders, operators, networks, fees! Create your own network, your own rules !!! 12.11.2020 - updated revision to FUSION 3 ....display in middleFront keyboad panel / cover PCB you can order here: https://www.pcbway.com/project/shareproject/Armachat___front_panel.htmlIt is very simple and low component count / cost device. It called as armageddon communicator but I think it can not survive any disaster,I making it for fun and learning communication, It is super hi tech walkie talkie,you have much more cool smart device in you pocket with unlimited distance.I am using standard RFM95 module, by my test I make poor connection at 4Km reliable at +- 2Km.More details and fresh news on project page.Patreon sponsoring very help with developmenthttps://www.patreon.com/bobriciusHow to make 13€ Bootloader programmer for SAMD21E18https://www.patreon.com/posts/13eur-bootloader-44384580(Also you can found this guide on my social networks)STEM Learning:What you can learn on this board?-modern architecture based on M0 arduino zero compatible, with lot memory and native USB-QWERTY keyboard matrix reading-complex input/output HID processing read keyboard data,-create and display graphics, save data to flash, send results over radio or usb-radio communication with world best, most advanced long range LORA radio technology-work with I2C sensors or process GPS data-learn lot about network architecture, packets, communication, addresing, delivery confirmation-RTC clock and alarms-power management, sleep, wake by alarm, wake on receive(..all this things I learning now on this project)Production and marketing plans:Hardware is very simple and easy to solder by hand (in pocket version with SAMD21E18), low active component count makeit very attractive as learn to solder kit. Unfortunately SAMD21 come without bootloader, this is little problem because SAMD needspecial tools to burn bootloaders, I have no experience how much is complicated burn bootloader in factory on bare unsoldered chip. I suggesting sell this as semi populated board > PCBA all active components except buttons and LORA module (Unsoldered lora module give small advantage because there is 3 world frequencies) Why TH tactile switches? because is very important to precise alignwith front cover plate and this can be little hard with hand.SWOT analysisStrengths:-no competition with almost finished and working communicator-compact design, standalone communicator-qwerty keyboard, much user friendly than encoders or arrow keys-officially supported Arduino powerful microcontroller with lot free memory and computation power-using only 15% memory now, unlimited future enhancements -extremely simple just one easy solder chip and buttons, cheap and low component count-low power consumption-color graphics displayWeaknesses:-no community, no users (maybe because I have not started selling )-currently no mesh networking or advanced message routing-my programing knowledge is limited (I quickly learning)Opportunities:-MOTTO> My network = my rules, no borders, no limits, no operators.-create own private message network with encryption possibility -disaster radio-GUI learning tool-USB HID keyboard learning-Advanced Radio network educationThreats:-ESP32 based devices can create unlimited communication with WIFI and BLE and forward messages between networks (I see future use ESP32 as gateways between wifi <>lora for smartphone, not as standalone device SAMD consume much less energy)-device is very easy replicable and anybody can sell cheaper versionHardware features:-SAMD21E18, more easy to solder in TQFP32-QWERTY keyboard -40 keys (4x10) desktop version -30 keys (5x6) pocket version-18650 li-on battery-1.8 TFT LCD display 128x160 ST7735-RFM95 lora module- 3 freq. by your country- IRQ / wake up-Beeper-Battery chargingWorking software features:-Send message ... compose and send message to specified recipient or broadcast -Receive message ... message is received on background and stored in memory.-Message editor ... write message about +/- 80 characters long ... 80 is now best readable on full display ....-Message memory ... all send/received messages are stored in memory-Display memory ... display memory content-RTC .... display time-Battery ... display battery voltage-EEPROM emulation ...user radio configuration spread factor / power, settings-time set-check message delivery confirmation-contact list display and check online contacts-select recipient or broadcastBEST working feature - resend undelivered messages - if delivery fail, message is stored with "undelivered" attribute. Ewery station at power on broadcast "Ready receive status", then if any near station receive this broadcast and have undelivered message automatically try send this messages, if then receive confirmation mark messages in memory as DELIVERED :) TODO software features:-sort from memory by contact-add message encryption-think about message forward (mesh)-add some USB link features like work as usb modem, send receive/message from PC terminal-GPS position parseNewest software version and libraries I publish to github.Assembly:-there is nothing special, I build 6 prototypes, with hand soldering, without issuesI am not saying best, they are just my steps :-Solder CPU, and all active/passive components-Burn bootloader> Connecting Atmel SAM-ICE> Chose Arduino zero native USB> Burn bootloader-Solder Display-Try some demo/test software-Solder radio RFM95 module-Solder buttonsBasic software:There is also nothing special, All parameters can be configured on gui menu.Download code, libraries, Burn.Unmodified libraries:#include <Keypad.h> #include <RTCZero.h> #include <Adafruit_GFX.h> // Core graphics library #include <Adafruit_ST7735.h> // Hardware-specific library for ST7735 #include <SPI.h> // include libraries #include <LoRa.h> //https://github.com/sandeepmistry/arduino-LoRa #include <FlashAsEEPROM.h> Fusion with PCB front panel, no other worlds ... It is amazing ;):User interface screens ...More details every day ... https://twitter.com/bobricius https://hackaday.io/project/170878-armachat-doomsday-lora-qwerty-communicator https://www.youtube.com/user/bobricius?sub_confirmation=1Operation demo video !!!!!Laser cutted front panel (2-layer aluminium style plastic) ... engraved and cut with my 2w diode laser(version with smaller but IPS 240x240 display)And some photos of newest version, you can see extreme simplicity.(DS3231 and battery are optionall)Battery holder is also practical stand !!!Smallest as possible ...https://www.pcbway.com/project/shareproject/Armachat___front_panel.htmlhttps://www.patreon.com/posts/13eur-bootloader-44384580