Testing of Clone PI AVR metal detector

Some years ago a have started building Clone PI AVR. Made a PCB, soldered all the components and ... and never found time to finish it until today. Well I haven't finished it yet but at lest gave it a first test run. For the screen and buttons i have re-purposed some front panel of some old router. Now i see that i will have to put it in to another box for better mounting on the metal detector itself but this time it was good enough for test run.…

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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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Reading DHT22 and Light sensor data using NodeMCU dev board

Experimented with reading DHT22 amd Light sensor modules using NodeMCU ESP12E development board. Main problem I had that timer did not work on old firmware, had to update it ( read previous post ). Other that that all went fine and could read data.One strange thing is that I am getting temperature a little bit higher than actual. Not sure why is that, maybe because board is powered by 3.3v and not 5v. Will have to find out that later.Code:if not tmr.alarm(0, 5000, tmr.ALARM_AUTO , function() print("Starting to read data:")…

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tmr.alarm not working on ESP12E 0.9.5 firmware

Tested that this sample was not working on dev board:if not tmr.alarm(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end) then print("whoopsie") endChecked firmware version (connected to ESPlorer and pressed reset):ESP12E default NodeMCU 0.9.5 build 20150318  powered by Lua 5.1.4Decided to update firmware. Found here that only 9.6 is available precompiled, later ones have to be costum built. Downloaded 9.6 files and uploaded them using ESP8266Flasher.exeChecked firmware version then:NodeMCU 0.9.6 build 20150704  powered by Lua 5.1.4And tested this code sample:if not tmr.alarm(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end) then print("whoopsie") endIt worked.

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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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Fixing ZX Spectrum+ 48K (s/n S01-135100) video problems

So, this ZX spectrum was alive, but during testing with some games (for example game "Breakthrough"), I noticed strange video glitch in upper screen part:My guess was it is not video RAM related, but probably RF module fault. First decided to change all electrolytic caps on the board and see if it helps - it did not. Picture was the same.Then decided to check RF module - remove it and re solder all joints.After putting it back I did a check with the same game. It helped a bit, but…

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Another ZX Spectrum 48K

Maybe I got carried away.. but here is another non working rubber keyboard ZX Spectrum I got (s/n D01-257600).Its interesting regarding those serial numbers, some are 01 some D01. I really would like to know what do they mean, if they mean anything ? Found one site that has list of some serial numbers and has a form to submit more. Probably later I will submit them serial number of my ZX Spectrum machines. But now, back to this one.. On the outside it has some bruises and scratches, also…

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