Show Posts
Pages: 1 2 [3] 4 5 ... 144
31  Using Arduino / General Electronics / Re: How to use RS232 in that case? on: April 01, 2014, 03:36:04 pm
Are you using an UNO?
You can use Serial.print(ln) instructions.
If the Arduino is the DTE device, you may need to set RTS and/or DTR.
If the Arduino is the DCE device, you may have to set CTS and/or DSR.
32  Using Arduino / General Electronics / Re: MOSFET choise... on: April 01, 2014, 02:52:25 pm
Look for:
Logic-Level Gate Drive
Low value for RDS(on) (Ω),    IMO I like less than .1 Ohms(100 milli ohms) (lowest possible)
Drain-Source Voltage, to be greater than your power supply
Continuous Drain Current, to be greater than your load will require

I use WinQcad no longer available.
Try Fritzing, Eagle, Kicad OR search the forums as it has been discussed here many times.
http://fritzing.org/home/
http://www.cadsoftusa.com/
http://www.kicad-pcb.org/display/KICAD/KiCad+EDA+Software+Suite
33  Using Arduino / General Electronics / Re: MOSFET choise... on: April 01, 2014, 02:15:36 pm
See Image also:
Vgs(th) is 2.5V (page 2)
34  Using Arduino / General Electronics / Re: LED Indicators for bike schematic on: April 01, 2014, 01:55:58 pm
Is it OK with you to switch the ground in this application instead of the supply?
How are you powering the Arduino?
How many LEDS will be on the trailer?

Edit:
See attached image in the PDF
35  Using Arduino / Project Guidance / Re: Question about Atmega328 on: April 01, 2014, 01:46:15 pm
Some problems here, would you attach the code you are referring to?
Are you connecting a bread board chip circuit to PC computer?
36  Using Arduino / Motors, Mechanics, and Power / Re: My first 110v project - Water pump on: April 01, 2014, 01:40:30 pm
I would switch the HOT wire (smaller of the two plug holes) not the Neutral wire.
I would also connect the earth ground wire to the motor frame if it is recommended to do it.
You may find you need a contractor too switch that much current.
37  Using Arduino / General Electronics / Re: LED Indicators for bike schematic on: April 01, 2014, 01:28:32 pm
I think you are going to be taxing the maximum current that a pin can provide.
I'll draw up a drawing and post you my suggestions for changes.

Before I do this, are you using any other pins on the Arduino?
38  Using Arduino / Motors, Mechanics, and Power / Re: Power supplies order on: April 01, 2014, 01:23:49 pm
Quote
That's the point: what if i connect both vin and power jack?
No.
You can use the power jack and USB at the same time.
If you wanted to use Vin and the power jack at the same time you need to add a diode between Vin and your external power supply.
Cathode goes to the Vin pin. 1N4007.
39  Using Arduino / General Electronics / Re: LED Indicators for bike schematic on: April 01, 2014, 01:11:08 pm
I cannot read what is connected to L or R.
IMO, I would use  GND wire.
What kind of bike?
I normally use 220R for most LEDs at 5v power supply, but, that depends on the colour and brightness of each led.
1N4004 is ok.
40  Using Arduino / Installation & Troubleshooting / Re: Uno external power supply problem on: April 01, 2014, 01:01:39 pm
Are you measuring at these points?
41  Using Arduino / Project Guidance / Re: led strips on: April 01, 2014, 12:41:06 pm
The image says N FET but says it is TIP120.
Two different animals here.
Place 220R in series with the Arduino pin.
Use something like IRL540 MOSFET.
See:
http://learn.adafruit.com/rgb-led-strips/usage
42  Using Arduino / Project Guidance / Re: Question about Atmega328 on: April 01, 2014, 12:36:41 pm
Quote
strange characters
Check that your baud rate on the serial monitor is the same as in the sketch.
43  Using Arduino / General Electronics / Re: LED Indicators for bike schematic on: April 01, 2014, 12:32:23 pm
You have no current limiting resistors on the LEDs.
Placing LEDs in parallel is not going to work very well.
Always limit the o/p current of an Arduino pin to max of 20ma.
44  Using Arduino / Installation & Troubleshooting / Re: Uno external power supply problem on: April 01, 2014, 12:28:05 pm
Pin 1 is GND pin 2 is o/p.
Remove the power and USB cable.
What are you measuring between these?
If this is shorted, your USB would note work either.
45  Using Arduino / Project Guidance / Re: Question about Atmega328 on: April 01, 2014, 12:19:31 pm
See:
http://www.gammon.com.au/forum/?id=11637
Pages: 1 2 [3] 4 5 ... 144