Assembled and boxed Clone PI AVR metal detector

Some more photos of boxed Clone PI AVR metal detector and self made coil. I have made a coil from Ethernet cable between two round plywood sheets filled with Makroflex sealant. More about making coil from Ethernet cable can be fount here. Idea how to seal everything came from here. Clone PI AVR intself was boxed in a box I bought in local electronics store. I decided to add a switch to switch off external beeper so that sound will be provided only through headphone socket. For the coil connector…

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Cleaning and repairing ZX Spectrum +3

Got a somewhat cheap ZX Spectrum +3 to my collection. It was marked as untested in eBay ( they usually are ), but I took the risk and bought as the price was ok.  On first test it powered up, the floppy disk was providing sound, TV could be tuned and startup menu appeared. First noticed that some of the keys ( lower part ) were not working. My guess would be that membrane will have to be replaced but anyway, disassembly will show. And it showed. As it more…

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How to build a hardware startup

Some good readings about hardware startups and starting a hardware business: How To Build A Hardware Startup, Created by Marc Barros (local copy of paper) "It's a simple question: Why are you starting a company? It's hard to answer. Either because you don't know or you are embarrassed about how simple the reason is. The good news is you can get away without have a clear why for a very long time. Most people will never ask you, instead they will focus on what you have built. The bad news…

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Eachine H8 Mini silent mod
Eachine H8 Mini - beeper removed and led soldered instead of it

Eachine H8 Mini silent mod

I was annoyed with Eachines H8 Mine constant beeping in headless mode so decided to make it silent once and for all. This mod is easy - just open the transmitter, remove beeper by desoldering it and solder similar LED instead of it ( check the polarity - positive is marked on the PCB  ). Then drill a hole of LED diameter in front side of controller case and it is done.  

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How to use Arduino IDE to program NodeMCU

1. Install the Arduino IDE from download section of arduino.cc website 2. Run Arduino IDE's arduino.exe3. Arduino IDE >> File >> Preferences (Shourtcut is CTRL + COMMA)>> Settings tab >> on Additional Board Manager URL side type this >> and click ok.http://arduino.esp8266.com/stable/package_esp8266com_index.jsonThis json object will bring necessary drivers for NodeMCU from the website esp8266.com to our Arduino IDE.4. Arduino IDE >> Tools >> Board >> Boards Manager... >> Type = Contributed >> click on install (Or, search ESP8266 from the search bar)5. Arduino IDE >> Tools >> Board >> NodeMCU 1.0 (ESP-12E…

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Repairing ZX Spectrum Kempston joystick

As recently I started tinkering with ZX Spectrum hardware, tested one old joystick I had. Up and right positions did not work during the games. Tested port reading with one simple program:10 LET x=IN 3120 PRINT X30 GOTO 10There was no reading in up and right position.I took apart joystick case and tested connection between PCB and plug - there was no connection for up and right wires.So, just took now DB9 female connector and soldered it instead of an old one that I have just cut away. 

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