Electrical Engineering V3 - Developers

When I was designing a physical interface before deciding to put a WiFi module onboard and control from the web I went with a d-pad, center button to enter/select menu item and a button for home/cancel. You could input characters in the fields with up/down (cycled through alphanumerics) and change cursor position with left/right. Now that I actually typed that out I'm glad I didn't assemble it that way... Having to cycle to the " " character to remove a character would have been horrible. Also I bought a load of PL-259<->F-female adapters then realized I actually could cut out two stages of adapters and a length of coax by just using BNC-male<->F-male. :(

[QUOTE=papkee;48254817]Anybody have experience programming menu GUIs? I can make the graphics part, and I know what things I want to be displayed, but I've been trying to figure out how to program in the physical navigation of the menu system. For instance, how I would navigate up and down through a list and enter into submenus, etc. Are there any useful libraries that could aid in this?[/QUOTE] What language are you using? What for would that GUI be? I could help you.

I just literally ran into this some hours ago: [url]http://ugfx.org/[/url] Talked with the guy running it. It's used in commercial companies already, so, it works, and it has quite a lot of functionality, all of which is turned off by default, so you don't waste resources on stuff you don't want. I need to have a closer look at it. Only complaint looking at it quickly is the license, it's not compatible with GPL.

Oooh, that could be useful. I'll have to look at that tonight along with my msp432 that came in today.

I just bought an arduino again after selling it about a year ago because I didn't know shit about electronics, now I know something I ordered a servomotor with it, and I have this old engine, I want to hook up the servo with the throttle-cable, but I want a fun/good way to handle the throttle, an on and off switch wouldn't do because it would instantly max the throttle if I would set it on, do you guys have any fun ideas?

[QUOTE=Staneh;48274942]I just bought an arduino again after selling it about a year ago because I didn't know shit about electronics, now I know something I ordered a servomotor with it, and I have this old engine, I want to hook up the servo with the throttle-cable, but I want a fun/good way to handle the throttle, an on and off switch wouldn't do because it would instantly max the throttle if I would set it on, do you guys have any fun ideas?[/QUOTE] Either PWM in to a low pass filter or a DAC would work.

[QUOTE=Staneh;48274942]I just bought an arduino again after selling it about a year ago because I didn't know shit about electronics, now I know something I ordered a servomotor with it, and I have this old engine, I want to hook up the servo with the throttle-cable, but I want a fun/good way to handle the throttle, an on and off switch wouldn't do because it would instantly max the throttle if I would set it on, do you guys have any fun ideas?[/QUOTE] Accelerometer, faster you shake it the higher it revs?

[QUOTE=Staneh;48274942]I just bought an arduino again after selling it about a year ago because I didn't know shit about electronics, now I know something I ordered a servomotor with it, and I have this old engine, I want to hook up the servo with the throttle-cable, but I want a fun/good way to handle the throttle, an on and off switch wouldn't do because it would instantly max the throttle if I would set it on, do you guys have any fun ideas?[/QUOTE] If you don't want an on/off you can use a potentiometer. Look at the servo knob example in the IDE. Not fun but it'll work.

Make it rev to nyan cat, i was going to attempt this myself but i lost the nyan cat code and couldn't find it, probably wouldn't be too good for the engine if you did it to fast.

[url]http://www.electrical-workbench.co.uk/2015/07/op-amp-compensation_27.html[/url] Here's a quick article I did that some of you may find useful.

I'm still running into a nasty CMOS latchup condition on my project. It's not something I can condition the lines with because it's RS-232 signalling and the addition of diodes causes the circuit to malfunction. The two devices need to be power sequenced as that is how Hayes assumed you would be using the modem but delay relays are both large and overly complicated. Even delaying the modem by 1/4 second is enough to eliminate the condition but I'm struggling to figure out how I can delay the modem's power relay for that long. There is however this circuit which is apparently designed for 12V but might work on 5v. [img]http://www.zs2brc.co.za/Tech/RotatorCTL/RotatorCTL4.gif[/img] Going off what little I still know, the diode isolates the circuit. The resistor adds a bias to the relay coil, so current decides to flow to the capacitor instead. Once it charges the relay actuates. Am I correct on this?

555 timer?

There has to be something simpler than a 555.

[QUOTE=pentium;48310067]There has to be something simpler than a 555.[/QUOTE] That is not a sentence you hear everyday.

[QUOTE=pentium;48310067]There has to be something simpler than a 555.[/QUOTE] You could always just install a push button and try to press it really, really fast.

[QUOTE=pentium;48310067]There has to be something simpler than a 555.[/QUOTE] [URL="http://www.electronics-tutorials.ws/waveforms/astable.html"]Two transistor mono/astable mulitvibrator?[/URL] [URL="http://www.electronics-tutorials.ws/power/unijunction-transistor.html"]Unijunction transistor oscillator?[/URL]

[QUOTE=pentium;48310067]There has to be something simpler than a 555.[/QUOTE] 111, it's 5 times simpler than 555

Well... I brought that 50W laser for 450 Euros... I realized I don't really have much use for it... should I send it back.. or make a use for it :|

I can't even. [url]https://www.reddit.com/r/AskElectronics/comments/3f5tmg/what_happens_to_voltage_source_if_i_take_out_both/[/url]

[QUOTE=nikomo;48332651]I can't even. [url]https://www.reddit.com/r/AskElectronics/comments/3f5tmg/what_happens_to_voltage_source_if_i_take_out_both/[/url][/QUOTE] That was painful to read.

[QUOTE=nikomo;48332651]I can't even. [url]https://www.reddit.com/r/AskElectronics/comments/3f5tmg/what_happens_to_voltage_source_if_i_take_out_both/[/url][/QUOTE] How can you know about power converters but not ohm's law

You'd be amazed at what people can learn incorrectly from google.

[QUOTE=nuttyboffin;48332190]Well... I brought that 50W laser for 450 Euros... I realized I don't really have much use for it... should I send it back.. or make a use for it :|[/QUOTE] Make 2D CNC (very simple to do), mount optical lense on it, then you have LASER ETCHING CNC.. If you choose correct LENS, you can ETCH VERY SMALL STUFF ON PCB, you can make your own CPU dude.

[QUOTE=nuttyboffin;48332190]Well... I brought that 50W laser for 450 Euros... I realized I don't really have much use for it... should I send it back.. or make a use for it :|[/QUOTE] I'm voting for making a use out of it.

Just ordered some boards. [url]http://gerblook.org/pcb/Zy3z4x6xT5yfxZGSmNNBUh[/url] Upper microUSB connector caused some concern with one person, but it's not really high-speed - will have to see how it works when the board gets here.

[QUOTE=Fourier;48334469]Make 2D CNC (very simple to do), mount optical lense on it, then you have LASER ETCHING CNC.. If you choose correct LENS, you can ETCH VERY SMALL STUFF ON PCB, you can make your own CPU dude.[/QUOTE] Hmm That sounds pretty cool. Do you think 50W and 1000nm wave length is good for this? How is the best way to test the laser / diode?

[QUOTE=nuttyboffin;48337282]How is the best way to test the laser / diode?[/QUOTE] Turn it on and check if it cuts stuff! [editline]31st July 2015[/editline] Don't look at the beam. [editline]31st July 2015[/editline] Or the reflection of the beam. [editline]31st July 2015[/editline] Or the reflection of the reflection of the beam. That's a powerful laser.

Setup the laser in another room, with the fuse taken out/circuit breaker switched off, close room, turn power on, wait a few seconds, turn it back off, go back in room, disable laser, turn power back on, turn on lights, check if anything's burnt to the ground.

I think I will send it back, Maybe if I see a cheaper or better one I will get it, but this little thing has like... no information online either. *Drool* Technical specifications: Max. output power [W]: 5400 Nominal laser power [W]: 4000 Beam quality [mm.mrad]: 25 Laser light cable [micrometers]: 600 Nominal power consumption [KW]: 125 Electrical connection: 315 A Nominal power consumption at 15ºC inlet temperature: 15 m3/h Cooling water temperature range in ºC: 22 Weight: 1500 kg Dimensions W X H X D [mm]: 3200 x 1700 x 1250 [img]http://www.eurobots.net/files/det_221_trumpf_laser_HL4006D_eurobots5.JPG[/img] [url]http://www.ebay.co.uk/itm/EYMAK-Laser-Trumpf-Haas-HL-4006-D-inkl-Kuhlsystem-Baujahr-1999-/281746013201?pt=LH_DefaultDomain_77&hash=item41995efc11[/url] [url]http://www.eurobots.net/descprn/id/221/print/Trumpf-Haas-Laser-Trumpf-HL-4006D-en.html[/url] ONLY £9000 D:

Hey, i'm trying to create my own portable phone charger with a battery like this one: [img]http://i.imgur.com/PIfnvpj.jpg?1[/img] and what i've done so far is: [img]http://i.imgur.com/2lCRAoB.png?1[/img] Not so good in electronics, but I seem to be missing something to get it working properly. My phone doesn't charge with this. maybe I need to raise the output to 5 volts?