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1  Using Arduino / Displays / 2x16 LCD SCREEN - NEED FOR 2X SIZE LETTERING on: July 20, 2014, 04:55:14 pm
I'm trying to display letters/characters using 2 rows of space.  Is this possible on a 2x16 LCD screen?  I wouldn't care if each letter took up 2 vertical spaces or 4 block spaces as long I knew what I'm working with.  Right now I'm using the LiquidCrystal library and it's functions within it.  Thanks. smiley-lol
2  General Category / General Discussion / What Application Is Used to Draw Sketches For Arduino? on: April 30, 2014, 01:13:43 pm
What Application Is Used to Draw Sketches For Arduino?  Like in this picture ->

3  Using Arduino / Project Guidance / Re: Green Laser 3VDC Ebay on: April 23, 2014, 07:03:15 am
Ok, I'll give it a try.  Thanks for the information!  smiley-cool
4  Using Arduino / Project Guidance / Re: Green Laser 3VDC Ebay on: April 22, 2014, 11:28:14 am
How can I switch this 3v laser on/off using the blink example?  I'm curious because there is no communication wire from the lazer.  smiley-slim
5  Using Arduino / Project Guidance / Re: Green Laser 3VDC Ebay on: April 22, 2014, 08:11:21 am
I found out the ebay seller from China wired black (-) and red (+) backwards.  It works with 3v (2 x AAA batteries).  Is there a cheaper way to step down from 3.3v to 3.0v without buying the step-down voltage chip?  I don't want to over work this laser. 
6  Using Arduino / Project Guidance / Green Laser 3VDC Ebay on: April 21, 2014, 02:14:24 am
I bought a 50mW 3vdc green laser from ebay.  It has a spring for use with 2 AAA batteries or 2 wires for breadboard connection.  I tried powering up the laser with 3.3v since that is the lowest voltage I can attain from the arduino uno.  For some reason the laser didn't light.  Is +0.3v going too much over the device rating? Could it be a faulty laser?  How can I step down to 3.0v cheap?  smiley-mr-green
7  Using Arduino / Motors, Mechanics, and Power / Re: 12VDC Relay on: April 20, 2014, 08:10:20 am
Great info on that page! I understand better now.  In experimenting with DC power, I would connect a lamp's positive (+) side to COM and NO leading to battery's positive terminal. Then the lamp's negative (-) side to battery's negative terminal.  So when does a wire get connected to "NC: normally closed relay interface"?  Also, the backend of the relay would be connected to the arduino Vcc, GND, and digital output pin.  It was mentioned that switching a relay off using DC power could melt/destroy it.
Quote
A DC spark / arc could continue for some time, acting like a miniature welder and welding relay contacts together.
Instead use a Power Field Effect Transistors.  Since my relay says SRD-12VDC-SL-C then I should be safe using 12VDC devices, right??  smiley-cool
8  Using Arduino / Motors, Mechanics, and Power / 12VDC Relay on: April 19, 2014, 07:18:32 pm
I bought a 12 volt relay from ebay.  My thought was I'd provide the back end with a 12v car battery or 12v lawn tractor battery and 1 line from the arduino to signal the LOW/HIGH trigger.  Then on the front end I'd power a 12v DC device, such as, a water pump or CPU fan.  Do I have the right idea for this board?  How is the "COM: Common Interface Relays" used?

Module description:
1. the module uses genuine quality relay, normally open interfaces Maximum load: AC 250V/10A, DC 30V/10A;
2. using SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA;
3. the module Operating voltage 12V;
4. the module can be high or low by a jumper setting trigger;
5. fault-tolerant design, even if the control line is broken, the relay will not operate;
6. the power indicator (green), the relay status indicator (red)
7. the interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient
8. module size: 50mm*26mm*18.5mm (L*W*H)
Module interface:
1. DC+: positive power supply (VCC)
2. DC-: negative power supply (GND)
3. IN: can be high or low level control relay
Relay outputs:
1. NO: normally open relay interface
2. COM: Common Interface Relays
3. NC: normally closed relay interface
High and low level trigger options:
It is low level trigger when jumper connect to LOW pin
It is high level trigger when jumper connect to HIGH pin


9  Using Arduino / Project Guidance / Re: GSM Controller for 12v Utility Pump on: April 10, 2014, 10:05:47 am
Thanks for both your input guys!  There is also a GSM Relay Controller with 7 channels  250V 10A 50 Hz relay contacts.  However, I didn't read anything about a quad band GSM receiver.  In getting the industrial grade GSM Relay Controller I could update my project to stronger more powerful hardware, such as, a pump with requires 1/2 horsepower.  I'm thinking to power the project with a single car battery.

http://www.ebay.com/itm/Seven-Relay-Output-GSM-remote-control-switch-device-DC12V-Power-input-/151274837051?pt=Home_Automation_Controls_Touchscreens&hash=item2338aed43b
10  Using Arduino / Project Guidance / GSM Controller for 12v Utility Pump on: April 10, 2014, 08:37:42 am
I'm considering on buying a 12v GSM Controller with 2 relays that can power 30A, 220VAC, 4000watts each.  I want to control a 12v utility pump which consumes 12 volts DC, 5 amps, 50 watts.  Is this overkill?  Can the GSM Controller handle this task easily?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=151250322106

http://www.ebay.com/itm/Brand-New-Marine-12-Volt-Utility-Water-Pump-Bilge-Stainless-Steel-Pump-Housing-/151273554059?pt=LH_DefaultDomain_0&hash=item23389b408b
11  Using Arduino / Project Guidance / Re: Charging 3.7v 165mAh LiPo battery on: February 15, 2014, 11:01:29 am
When should the led be lit or not lit?  I'm curious if i wired up everything accordingly.  This is a 1 cell lipo battery charge circuit.
12  Using Arduino / Project Guidance / Re: Charging 3.7v 165mAh LiPo battery on: February 12, 2014, 12:09:17 pm
I finally got this project wired up.  Now what if the CHG line doesn't have a system load?  You know, something the battery would normally power if not charging.  I'm just looking to charge the 2 lipo batteries w/o a system load.  I thought maybe the CHG pin would have to be tied to GROUND.  Is that true?  Otherwise it looks as if the indicator led may not be tied to GROUND unless it is doing it thru the MAX1811 IC.  What should the normal operation look like for this circuit?  When should the led be lit or not lit?  I believe the indicator led should be lit when the battery gets plugged in.  Then the led turn off when the battery if full.  How should it function?  Thanks.
13  Using Arduino / Project Guidance / Re: What is Special about Arduino Pro on: January 11, 2014, 06:17:31 am
just trying to understand better.  i'm not using this in a project right now. thx!
14  Using Arduino / Project Guidance / Re: Turn ON/OFF Battery Powered Toy with Pushbutton on: January 11, 2014, 06:14:08 am
damn, thanks for the heads up!
15  Using Arduino / Project Guidance / Re: What is Special about Arduino Pro on: January 10, 2014, 03:47:43 pm
That's true but the RST pin is also on the FDTI header.  The CTS-I low power pin would connect to GND on the FDTI header as well.  Your right though.  I should have directed my question to the BT hardware.
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