Show Posts
Pages: 1 ... 18 19 [20] 21 22 ... 147
286  Using Arduino / General Electronics / Re: Temperature Control with AdaFruit LCD Shield on: March 24, 2014, 03:37:53 pm
Yes
287  Using Arduino / Microcontrollers / Re: TINY AVR PROGRAMMER on: March 24, 2014, 03:35:09 pm
You are correct.
288  Using Arduino / Microcontrollers / Re: TINY AVR PROGRAMMER on: March 24, 2014, 03:30:33 pm
Or you could use the Arduino as the programmer.
289  Using Arduino / General Electronics / Re: OpAmp or Transistor on: March 24, 2014, 03:27:34 pm
May be a cheap, go no go, Logic Probe.
290  Using Arduino / General Electronics / Re: Smoothing Capacitor value? on: March 24, 2014, 03:25:40 pm
Quote
these little guys
What guys?
Which capacitor are you referring to?
291  Using Arduino / General Electronics / Re: Small transformer on: March 24, 2014, 03:20:16 pm
May be modify one of these or something similar:
HERE
292  Using Arduino / General Electronics / Re: OpAmp or Transistor on: March 24, 2014, 03:14:50 pm
Usually you include everything in a schematic (like a block, resistor, lamp etc.) including the load element.
293  Using Arduino / General Electronics / Re: OpAmp or Transistor on: March 24, 2014, 02:47:53 pm
As a side note, you may want to investigate a ULN2803 driver ( also needs a collector resistor ).
On second hand, the o/p low might be too large.
294  Using Arduino / General Electronics / Re: OpAmp or Transistor on: March 24, 2014, 02:33:47 pm
Sounds to me a simple NPN or PNP switch will do what you want.
295  Using Arduino / Motors, Mechanics, and Power / Re: Continuous servo rotation without for loop on: March 24, 2014, 02:30:22 pm
If you are asking if you can put your code in setup() which runs once at reset, then yes.
296  Using Arduino / Motors, Mechanics, and Power / Re: Wonder about the arduino output pin power on: March 24, 2014, 02:28:20 pm
USB will supply 5volts to the Arduino.
External voltage to the jack is turned into 5volts.
So the o/p on a pin will be very near 0 to 5 volt transitions.
If you are thinking of the current on the other hand, the Arduino o/ps are safe to support 20ma.
USB from a PC usually is a maximum of 500ma.
If you use external voltage try to keep it low, 7volts is best as the on board regulator may get hot.
297  Using Arduino / General Electronics / Re: basic soldering iron - tips and advice? on: March 24, 2014, 01:21:41 pm
Lead molecule is large for absorption, avoid cuts cover with bandaid, wash hands, use ventilation if concerned.
298  Using Arduino / General Electronics / Re: OpAmp or Transistor on: March 24, 2014, 01:13:23 pm
A comparator may be a better choice for speed, eg LM339.
With the transistor, incorporate a collector resistor.
For simplicity I would use a transistor.
299  Using Arduino / Project Guidance / Re: Convert BCD to decimal for switch case on: March 24, 2014, 12:46:45 pm
The good thing about software is you can test things out for yourself.
Note: the top bits (6,7) of PORTB, UNO, are not connected to  i/o pins.
PORTB bit 0 is connected to UNO pin 8 while bit 5 is connected to pin 13.
So if you what to use the top 4 "Pins" this is bits 2, 3, 4 and 5.  Bits 6 and 7 are not usable.
val = PINB & 0b11000011;
For this example, switch case changes, you need to be looking at: 4,8,12,16,20,24,28,32,36,40 etc. 60 for the 16 possible combinations.

18000000UL I've got in the habit of adding UL to things that need to be unsigned long.

Edit:
Learn to make delays with the millis() function.
300  Using Arduino / General Electronics / Re: Resistors for 2N3904 Transistors and LED Strips on: March 24, 2014, 12:07:12 pm
Quote
So, I tried the approach without resistors and I was able to run the clock for hours without noticing any ill effects.
Sounds like you know what to do, but refuse to do it.
Pages: 1 ... 18 19 [20] 21 22 ... 147