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1021  Using Arduino / Programming Questions / Re: sainsmart 3.2" demo error on: February 02, 2013, 08:49:58 am
Get the new libraries from Henning Karlsen, Search for UTFT. The stuff that you downloaded won't work properly at all. There is a new UTFT Ver 2.0 that will work perfectly. I have 5 of those displays and all work quite nicely... With the new libraries. The ITDB02 libraries are 3 or 4 years old... Junk. totally, Junk.

Bob
1022  Using Arduino / General Electronics / Re: 3 wire solenoid on: February 01, 2013, 07:03:54 pm
That Sir is what I was trying to tell you. 1. 1 solenoid only per controller 2. the transistors must be capable of 20A surge current for about 50 uS I used 2 different ones a D44H11 PNP and a PN222 Mosfet I found surplus somewhere. It wasn't the best part but it was OK for the design And the surplus guy had about 5K of them that He'd be happy to get $0.05 Ea for.. So I used the Rdson to damp the solenoid by keeping the gate high (or base low) this kept the 4700 uF cap connected until all the ringing stopped, 100 mS worked well.
I used a 100 ohm resistor in series with the cap and the battery to make it the capacitor the only source of current... A battery dies after a while and it does so generally by loosing current capacity, the capacitor means that as long as the battery/solar panel can keep the cap charged all will work as it should even with a battery reduced to 100 mAH capacity.  I was using 1.2 AH Yuasa 12 V SLA batteries. The charging was processor controlled and temp compensated charge rates were applied to avoid battery damage due to overcharging.
Controlling a bi-polar solenoid is easy but it takes some seriously wide PCB tracks and a serious driver transistor, a very serious driver. Probably the easiest for you would be an H-Bridge based on an L298 H bridge motor driver, 2 pulses Forward (open) and Go (momentarily apply power) and 2 more for the Reverse (close) and Go. The shields are 6 to 12 dollars each and ready for your application assuming that your original spec's were right.
You could charge a capacitor and "dump" it into a coil with the H-Bridge.

Bob
1023  Using Arduino / General Electronics / Re: error on power supply on: February 01, 2013, 05:04:03 pm
The answer is simple... find the nets "OUTPUT" and "SUPPLY" on the nets +5V and GND and change them to the net they are connected to, +5 or GND. Did you mix 2 schematics?, that's a common error, I've done it many times.   When you attempt to put 2 schematics together, run the ERC on the schematic. This will help you resolve any net errors created when pasting schematics together.. and any other common errors like unconnected GND or +5 pins on IC's and un-intentional connections like your net issues, Shorts too..

Bob
{Edit RKJ
1024  Using Arduino / General Electronics / Re: Rotary potentiometer with steps/positions on: February 01, 2013, 04:30:10 pm
I Think Young Person that you need to do some reading so that you have a better idea of what you have, what you want to do and how you are going to do it.
Before you start to work, You must "Plan your Work" and then you Must "Work Your Plan".

Bob
1025  Using Arduino / General Electronics / Re: Arduino Due consumption on: February 01, 2013, 11:24:36 am
Did you Ever look in the mirror?

Bob
1026  Using Arduino / Programming Questions / Re: Is there a good Basic interpreter? on: February 01, 2013, 11:00:02 am
Smoke!

Bob
1027  Using Arduino / Microcontrollers / Re: Using mega2560 as a ftdi breakout board on: February 01, 2013, 10:47:11 am
The FTDI board you referenced is a really good product and a very nice price. I don't know the exact exchange rate but the part is under $3.00 US, a very good price and the solution to a lot of potential issues.

Bob
1028  Using Arduino / General Electronics / Re: hpf for tweeter on: February 01, 2013, 10:38:11 am
Ain't Google Wonderful??...

Bob
1029  Using Arduino / General Electronics / Re: Rotary potentiometer with steps/positions on: February 01, 2013, 10:31:54 am
It works perfectly... providing that you choose to save the previous state so re entry places you at the position you exited at. Positional feedback must be from the visual display and not the knob. You don't read the knob you use the knob to read... Regardless of what the knob really is, rotary encoder, pot or rotary switch. Using a rotary encoder is probably the best move as it doesn't have the 270  deg rotational limitation of a pot or the mechanical stops that most rotary switches do.
{Edit RKJ}

Bob
1030  Using Arduino / General Electronics / Re: I need help to design a circuit to control a latching solenoid on: January 31, 2013, 07:03:11 pm
Fun... Hell man what you are talking about is hard work, the controller is easy

Bob
1031  Using Arduino / General Electronics / Re: NRF24L01+ antenna connected to AC audio line on: January 31, 2013, 06:59:38 pm
Maybe OP thinks a nRF24XX will handle audio..

Bob

In real time...
1032  Using Arduino / Programming Questions / Re: Is there a good Basic interpreter? on: January 31, 2013, 06:30:46 pm
No.. Nick The God *dhenry* has spoken it isn't for us mere mortals to understand the words or meaning, If as you say, there ever was one...

Bob
1033  Using Arduino / Programming Questions / Re: [SOLVED] Project Timer with DS1307 - Alarm.TriggerOnce(); - USE DYNAMIC on: January 31, 2013, 02:57:29 am
You Should deservedly be Very Proud of your self. You did a fine job all the way, A very fine Joj.

Bob
1034  Using Arduino / Programming Questions / Re: error: avrdude: stk on: January 31, 2013, 12:30:46 am
Also the reason why he can't reprogram the Uno... @ 4.6V / 4 = 1.15 V or a nearly discharged Ni-Cd battery and there is a fixed 1.6 - 1.8 volt regulator I/O differential which would  leave about 2.5 - 2.9 V for the processor, Maybe and worse because of the poor state of the Ni-Cd's

Bob
1035  Using Arduino / General Electronics / Re: Decoupling shift registers on: January 30, 2013, 12:45:06 am
Funny thing about *dhenry* is that he runs when challenged by anyone who has more experience.
I just wish he really knew 50% of what he claims expertise in. many times he just simply tells
the truth as his education permits which is frequently either wrong or not applicable to the issues at hand
Probably *dhenry* believes his "Contributions" are useful, Perhaps he does know the failings and is
providing them as 'lessons' to be discovered.. although there is usually a disconnect between the
question and the answer that is vaguely reminiscent of the Jabberwocky's speeches from
"Through The Looking Glass" by Lewis Carrol...

Bob
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