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. For Atmega programming I used Mini Pro TL866 programmer I have bought while ago - works like a charm. You can see some photos and video on work in progress.     https://www.youtube.com/watch?v=VZVZoRKr3T8 Circuit of Clopne PI AVR: HEX file for burning Atmega 8 and PCB Sprint layout.

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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:") light = adc.read(0) or "" print("Light:"..light) pin = 4 status, temp, humi, temp_dec, humi_dec = dht.readxx(pin) if status == dht.OK then -- Float firmware using this example print("DHT Temperature:"..temp..";".."Humidity:"..humi) elseif status == dht.ERROR_CHECKSUM then print( "DHT Checksum error." ) elseif status == dht.ERROR_TIMEOUT then print( "DHT timed out." ) end end) then print("whoopsie") end

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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 MODULE)

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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 still I was not happy with the result. White line disappeared, but it seemed like upper part was washed away a bit:And then it came to my mind a thought about why the hell I am using this RF module at all. I could just do a composite mod and that would definitely would solve all RF related video problems.Composite mod as it is called, is just disconnecting power and signal wires that go from RF module - means disconnecting RF module. Then, in the RF module itself, disconnecting resistor from video output connector. And finally, connecting video output from board to video output connector in RF module using…

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