== Logbook

=== 2014

* Pre-printed parts by Mendel Parts (Mendel v2): [http://reprap.org/wiki/Prusa_Mendel_(iteration_2)]
* Elektronic board: [http://reprap.org/wiki/Megatronics_2.0]
* Running Marlin firmware: [https://github.com/rickvanderzwet/Marlin/]

Some handy pages to get started:
* Caliberation: [http://richrap.blogspot.nl/2012/01/slic3r-is-nicer-part-1-settings-and.html]

=== March 9, 2018 

{{{
[rick@rvdzwet-wasus Marlin]$ lsb_release -a
LSB Version:	:core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:...
Distributor ID:	Fedora
Description:	Fedora release 27 (Twenty Seven)
Release:	27
Codename:	TwentySeven


[rick@rvdzwet-wasus ~]$ arduino
java.awt.HeadlessException
	at java.awt.SplashScreen.getSplashScreen(SplashScreen.java:117)
	at processing.app.Base.<init>(Base.java:206)
	at processing.app.Base.main(Base.java:135)


[rick@rvdzwet-wasus ~]$ rpm -qa | grep openjdk
java-1.8.0-openjdk-headless-1.8.0.161-5.b14.fc27.x86_64

[rick@rvdzwet-wasus ~]$ sudo dnf install java-1.8.0-openjdk


[rick@rvdzwet-wasus ~]$ arduino
java.awt.HeadlessException: 
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
	at java.awt.SplashScreen.getSplashScreen(SplashScreen.java:117)
	at processing.app.Base.<init>(Base.java:206)
	at processing.app.Base.main(Base.java:135)



/usr/share/arduino/hardware/arduino/avr/boards.txt


##############################################################

megatronics.name=Megatronics

megatronics.upload.tool=avrdude
megatronics.upload.protocol=wiring
megatronics.upload.maximum_size=258048
megatronics.upload.speed=115200

megatronics.bootloader.low_fuses=0xFF
megatronics.bootloader.high_fuses=0xDA
megatronics.bootloader.extended_fuses=0xF5
megatronics.bootloader.file=stk500v2/stk500boot_v2_mega2560.hex
megatronics.bootloader.unlock_bits=0x3F
megatronics.bootloader.lock_bits=0x0F

megatronics.build.mcu=atmega2560
megatronics.build.board=AVR_MEGATRONICS
megatronics.build.f_cpu=16000000L
megatronics.build.core=arduino
megatronics.build.variant=mega
}}}

Difference between thermistor and thermocouple: https://electronics.stackexchange.com/questions/24975/differences-between-thermistors-and-thermocouples

=== March 10, 2018 

==== Dead PSU Controller

{{{
start
echo: External Reset
Marlin 1.1.8

echo: Last Updated: 2017-12-25 12:00 | Author: (none, default config)
echo:Compiled: Mar 10 2018
echo: Free Memory: 5418  PlannerBufferBytes: 1264
echo:Hardcoded Default Settings Loaded
echo:  G21    ; Units in mm

echo:Filament settings: Disabled
echo:  M200 D3.00
echo:  M200 D0
echo:Steps per unit:
echo:  M92 X80.00 Y80.00 Z4000.00 E500.00
echo:Maximum feedrates (units/s):
echo:  M203 X300.00 Y300.00 Z5.00 E25.00
echo:Maximum Acceleration (units/s2):
echo:  M201 X3000 Y3000 Z100 E10000
echo:Acceleration (units/s2): P<print_accel> R<retract_accel> T<travel_accel>
echo:  M204 P3000.00 R3000.00 T3000.00
echo:Advanced: S<min_feedrate> T<min_travel_feedrate> B<min_segment_time_us> X<max_xy_jerk> Z<max_z_jerk> E<max_e_jerk>
echo:  M205 S0.00 T0.00 B20000 X10.00 Y10.00 Z0.30 E5.00
echo:Home offset:
echo:  M206 X0.00 Y0.00 Z0.00
echo:PID settings:
echo:  M301 P22.20 I1.08 D114.00
ok T:18.87 /0.00 B:23.38 /0.00 @:0 B@:0
}}}

Listing of g-code (Gcode) found at: http://marlinfw.org/meta/gcode/ 

Bed temperature reported using M105 was incorrect since power supply was faulty causing interference on the IC measuring the temperature. Replaced power supply, all happy again.

==== Dead PSU heatbed

My resistor bed consist of of 4 x 2R2 (WH10) in series resulting in 9 Ohm, PSU does not like this low load conditions or is simply broken which would make my 2nd dead power supply. The new PSU is only 12V which is not heating up properly. According to [https://en.wikipedia.org/wiki/Ohm%27s_law Ohm's law] (I = V/R or R = V/I or V = IR) and my resistor rating i get 1.3A, which in result would yield only (W = VI) 15.6W heating power, not sufficient since my total resistor capacity is 40W. Which would give me W = VI combined with V = IR becomes W = IRI. W=40, R=9, makes I = 2A. Which in result would require V to be 40W / 2A = 20V. To fix this I will need to change the resistor bed layout. Instead of 4 in series. Put two in parralel and next two pairs in serie.