Show Posts
Pages: 1 [2] 3 4 ... 193
16  Using Arduino / Programming Questions / Re: Pointer problems on: August 02, 2014, 09:23:03 pm
+1 @ Pyro

17  Using Arduino / Programming Questions / Re: Parsing GPS data on: August 02, 2014, 08:12:54 pm
There is a GPS application  TinyGPS++ that might be of great use to you.
It has been my "Go To" solution for reading the GPS NMEA string, quickly and easily.

18  Using Arduino / Programming Questions / Re: Help with Platform I/o definitions on arduino on: August 01, 2014, 10:17:54 pm
@ AWOL  +1

19  Using Arduino / Programming Questions / Re: Multiplexer Problem with arduino on: July 25, 2014, 05:26:12 am
Ground Vee pin7. And do read the  the data sheet.. Carefully.

20  Using Arduino / General Electronics / Re: 110V detection on: July 22, 2014, 06:36:50 pm
It might be simpler to use a NE2H (W 100K series current limiting resistor) across the wires going to the load and an LDR to sense when the light is "On". You will need to shield the LDR from incident light and heat shrink tubing does well for this.  Alternately the LDR / neon light combination could be potted in an opaque potting material. The reasoning for the neon lights that fast, high energy transients will destroy semiconductor light emitters (Led's) quickly... I made that mistake many years ago when I made a sensor circuit to determine when any of 10 relays were energized from another mechanical controller by measuring the relay coil voltage... needless to say the opto-isolators were destroyed in the field as soon as the system was powered up and activated... I might add that I had tranzorbs across the relay coils and a zener clamp across the LED's.. were useless in fixing the problem... Being the engineer on that project... It was my duty to find and fix the issues. and the neon light/LDR combination was the answer that worked every time in the field. I might add that some of the relay coils were grounded and some were connected to 120/240 Vac and grounded to activate, which precluded  the use of a very wide return point which would have greatly facilitated filtering or clipping the transients... This was for a center pivot irrigation controller that had to report all conditions, water flow, position, number of rotations , variable for the individual crop being grown and to control the "End Fire sprinkler valve that irrigated the corners of a quarter section plot of land..

21  Using Arduino / Programming Questions / Re: [SOLVED] Shuffle a char array? on: July 22, 2014, 03:16:12 pm

22  Using Arduino / Programming Questions / Re: My EEPROM data kept resetting =( on: July 21, 2014, 10:27:02 pm
Your schematic shows an Arduino? pin? that is grounded directly...
Do you have the board wired as per the drawing? or is the switch symbol incorrect?
@ Guix,  Which pin on an Arduino is PIC?

23  Using Arduino / Networking, Protocols, and Devices / Re: SD card + nRF24L01 SPI conflict on: July 20, 2014, 12:41:23 pm
Try 47 - 100 uF. The 3.3 V regulator on most Arduino devices is only good for more than 50 mA.
The larger filter cap helps to smooth the power to the radio and is the most common failing of the Uno or Mega boards 3.3 v power supply.

24  Using Arduino / Networking, Protocols, and Devices / Re: My NMEA GPS parsing library. on: July 20, 2014, 05:59:17 am
And tjnygps+ is a whole different thing entirely.
I''ve used both and tiny+  is the easiest of all

25  Using Arduino / Microcontrollers / Re: How establish communication between Attiny and Arduino One? on: July 17, 2014, 06:09:54 pm
The I2C bus does have some length and loading issues..About 20 cm and a max of about 400 pF. It was never intended for wired use as I2C means Intra Integrated Circuit.. On one board, not a meter of wire per leg. A basic rule of thumb for I2C is that, more devices on one bus require lower value pull-downs to minimize the effects of bus loading.
RS485 is much better suited for this purpose as it is a long distance multi-drop communications protocol and MAX485's are inexpensive and easy to use. RS485 breakout boards are inexpensive on FleaBay..

Edit for clarity.. Doc
26  Using Arduino / Microcontrollers / Re: Please help. 3.3V usage. on: July 13, 2014, 03:55:54 am
@ Paul... +1

27  Using Arduino / Programming Questions / Re: Void Setup on: July 12, 2014, 03:55:21 pm
A Good book on C++ Might help... Is Free Too...
This might help.. What value is setup() supposed to return and to where... 
Setup() is called only once.
Void indicated that setup returns nothing. is one of Many "Go To" resources available for learning the language.

28  Using Arduino / Microcontrollers / Re: Microchip crystal errata? on: July 10, 2014, 08:02:08 pm
Well, they are 'usually' good with free samples... Spreading useless technology... This was the reason I quit using Microchip for anything important...

29  Using Arduino / Programming Questions / Re: Developing with c++ on: July 03, 2014, 02:02:08 pm
The "basic" Arduino "language" ic C++... some electronics knowledge would go a long way in helping your project towards fruition.
Sometimes it is most difficult to write code to repair defective circuitry... , So  a basic knowledge of electronics would be  very useful.. In my working days we called fixing bad circuitry...tuning the bread slightly reducing the uC clock crystal loading cap values to compensate for the extra stray capacitance of the bread board. There are some applications I've done where the proc  doubled as the reference clock for a PLL ... Another area where a good base in electronics or a class a engineering techie is a must..

30  Community / Bar Sport / Re: Question about FAQ and Open Hardware. on: June 28, 2014, 05:29:57 am
When I was young... the only "Solid State devices were lead sulphide or Galena "Cat whisker" detectors for AM broadcast band "Crystal Radio's", Some selenium and copper oxide rectifiers were just coming in vogue as replacements for Tungar or mercury vapor rectifiers..
 This was in 1956 I was 10 years old then... How old were You?

Pages: 1 [2] 3 4 ... 193