Show Posts
Pages: [1] 2 3 ... 113
1  Using Arduino / Displays / Re: LCD and refreshing a countdown timer - best practices? on: Today at 05:11:47 pm
Hi

Quote from: kbarre123
I was wondering if the best way to circumvent this is to break up the "00:00:00" composite string into three separate components (one for hour, one for minute, and one for second) and only update the components when necessary. That way, only the second component would be flashing continuously, and the minute/hour components would only flash when they're updated.

That's what i would do (and part of it is what i've been doing so far).
Updating only when necessary will also get rid of flashing seconds indicator, as you'd only erase and rewrite a new value once every second instead of every iteration.
So yours sounds like a good plan to me.

Happy brewing !
2  Using Arduino / Displays / Re: Backlight and I2C on LCD Display on: Today at 03:16:55 pm
That is why i asked..
3  Using Arduino / Displays / Re: Backlight and I2C on LCD Display on: Today at 02:50:09 pm
Earlier you showed a picture identifying your transistor as a BC548.
Is that the one you actually used ?
If not, what one did you use ?
4  General Category / General Discussion / Re: kickstarter - what a crock! on: Today at 02:04:28 pm
He'll probably make his $ 10,000 goal (and then some).
Kickstarter is a very nice initiative, but it's long been so hyped up that anybody can "earn" some dough the easy way.
Lots of suckers that don't look much further if they find something like this over there.
He'll sell his 600 units within days, to people that have no idea what they'll actually get.
It will kill Kickstarter in the end, if they don't put a halt to "projects" like these.
5  Using Arduino / Displays / Re: Backlight and I2C on LCD Display on: Today at 01:24:24 pm
But why a resistor to the ground isn't a proper circuit? (really newbie question I know, but hell, I am a newbie smiley-wink)

By the way, did you know a potentiometer consists of 2 resistors in the way it is applied here to control the contrast ?
It doesn't do what you seem to think it does the way you hacked it.
6  Using Arduino / Motors, Mechanics, and Power / Re: DC Motor Current Goes DOWN When Stalling? on: Today at 12:32:48 pm
Such shutting down would go with a rapid heating up of those batteries.
Is there some heating of these batteries, Reenforcements ?

Also, measure voltage across your motor.
If you block the inlet, what happens with that voltage ?
7  Using Arduino / Motors, Mechanics, and Power / Re: DC Motor Current Goes DOWN When Stalling? on: August 20, 2014, 05:07:21 pm
Does that explain that he didn't see the current going down, but that it went up ?

OP: didn't you hear the blower rev up by any chance ?

Ever tried what happens if you block the hose of a running vacuum cleaner ?
8  Using Arduino / Motors, Mechanics, and Power / Re: DC Motor Current Goes DOWN When Stalling? on: August 20, 2014, 03:55:04 pm
Quote from: Reenforcements
(right?)

Wrong.

If you cover the blower, a vacuum will be created.
There will be no more air that gets pushed.
Effectively you will take away most of the load.
That's why you see the current go down.

The motor is not stalling.
It would if you'd find a way to block the fan in a safe way (do not try that, seriously !).
9  International / Deutsch / Re: Hallo bin neu hier on: August 20, 2014, 03:40:30 pm
Willkommen.

So schwierig ist dass doch nicht aufzufinden:

Ja ! (click)
10  Using Arduino / General Electronics / Re: 4 diode rectifier bridge on: August 20, 2014, 02:47:22 pm
 smiley-eek
LOL polymorph
11  Using Arduino / General Electronics / Re: 4 diode rectifier bridge on: August 20, 2014, 02:36:43 pm
It is correct.

You're supposed to assume the current that enters the bridge also is leaving the brigde.
There will be 2 diodes active at any given time the AC is present.
Current rating is per diode.
12  Using Arduino / Displays / Re: Backlight and I2C on LCD Display on: August 20, 2014, 02:25:37 pm
@Zarnick:
i missed your answer to my first reply.
The Fritzing doodle shows PCF pin 7 to be in use for brightness control.
As stated before, you need the resistor in the base of the transistor, don't forget that.

If you do want to use that PCF for such functions, it should be able to do something alike, but the PWM would need to be a software solution for this, and be probably at a relatively quite low frequency.
Not a thing to use when starting with this matter i'd say.

You need to know exactly what pin the library you are using expects for brightness and contrast control.
Sometimes you can set this, also something that should be explained in the libraries documentation.
13  Using Arduino / Displays / Re: Backlight and I2C on LCD Display on: August 20, 2014, 02:13:22 pm
My datasheet seems to be incomplete.
Which pin is the PWM compatible PCF8574 pin ?
14  Using Arduino / Displays / Re: Backlight and I2C on LCD Display on: August 20, 2014, 02:04:02 pm
You are connecting power lines direct to the back light, following that "do it this way and it will magically work" site.
(They are actually trying to invoke magic by mentioning it on this particular page).
Well, no magic there.
You are powering the back light LEDs, so it will light to the intensity set by the resistor you are using for this goal.
There is nothing controlling the LEDs from the PCF8574.
And there is nothing controlling the contrast either.
So your findings are correct.

Most likely controlling the contrast and back light will only work with noticeable difference between the values 0 or any other value.
That means any other value will turn it on (100 %), while value 0 will turn it off.

By the way, did you know a potentiometer consists of 2 resistors in the way it is applied here to control the contrast ?
It doesn't do what you seem to think it does the way you hacked it.

I take it that the display works but you are looking for away to control back light and contrast ?
15  International / Nederlands / Re: Program Arduino Pro Mini with an Arduino mega 2560? on: August 19, 2014, 03:10:12 pm
Hoi, beide personen welkom op het board.

@Ivanderpoel:
Wees duidelijk wanneer je een vraag stelt.
Zoals poeg al zei, laat weten wat je al gedaan hebt, wat je verwacht(te) en wat je kreeg.
Anders moeten de mensen die je willen helpen gaan gokken en dingen aannemen, en dat niet echt handig als je hulp wil.

Verder moet je ook proberen misverstanden te voorkomen door duidelijk te zijn.
Een mini is iets anders als een pro mini, en daarom moet je die termen niet door elkaar gebruiken.

poeg lijkt aan te nemen dat je je pro mini wil programmeren via de ICSP methode, en das helemaal niet vreemd.
Maar is dat wel wat je wil ?
Wil je niet de mega 2560 als USB - serieel adapter gebruiken ?

Het nadeel van het programmeren via de ICSP methode,is dat je daarmee de bootloader kwijt raakt, tenzij je die juist wil maken.
Daarmee verlies je dan dus de mogelijkheid om het ding via de seriƫle poort te programmeren.

We weten dus niet wat je wil, dus zitten we nu te gokken en dingen aan te nemen.
Dus: begin eens opnieuw en vertel wat je precies wil doen, en mogelijk waarom je dat wil.
Dan is de kans veel groter dat iemand je een antwoord op maat kan geven.
Pages: [1] 2 3 ... 113