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31  Using Arduino / Microcontrollers / Re: MEGA 2560 reset voltage on: September 10, 2014, 06:23:32 am
@ Raschemmel your information is not quite correct... Pull up  the reset pin above ~ 11V (read the data sheet...) and you will place the chip in HV programming mode.. Commonly used to fix accidently Bricked controllers.. and become more familiar with actual Low and High input pin levels both  regular and Schmitt  trigger type inputs...

Doc
32  Using Arduino / Microcontrollers / Re: Using radio library with ATTiny84? on: September 10, 2014, 05:02:41 am
IF you'd taken the time to search for pcrel here in the Forum or [Gasp] Google for it you would have solved half your errors and I really don't care to do it for you... but you might just read this instead of asking others to do the same lame S**t...
http://forum.arduino.cc/index.php/topic,116674.15.html..
Ps: this took about 4 seconds to do.. mainly because I'm not a fast typist..
BTW there were about 75.5 K google answers... in 0.35 seconds.

Docedison

Btw... I think your "handle" was well chosen...
33  Using Arduino / Programming Questions / Re: Mosquito Anti Loitering Device on: September 10, 2014, 04:18:51 am
How did you confirm the sensitivity to a single Mosquito they are not large enough to be much of an IR emitter and to the best of my limited knowledge exothermic in growth or digestion of food...
IMO your test conditions are questionable... Better, I think to detect the noise generated by their wings in flight...

Doc
34  Using Arduino / Programming Questions / Re: Time.h and arduino-mk on: September 10, 2014, 01:02:46 am
@ Minchinion...
+1 A good lesson for those of us that believe we know better...

Doc
35  Using Arduino / Programming Questions / Re: Time and TimeAlarms Libraries – Ask here for help or suggestions on: September 08, 2014, 09:16:33 pm
THis might be of use to you for your current issues but I wrote it for a Mega2560.. a year or so back

Doc
36  Using Arduino / Programming Questions / Re: Help changing time on RTC1307 with buttons on: September 07, 2014, 10:00:24 am
# JimboZA Good point, there are many different 32 KHZ "Crystals" They are all Piezo tuning forks.. Not resonators or crystals in the normal "sense" of the word. Simply slightly different structures differing only in dimension a different combinations of Piezoelectric materials or both.
It is these small difference that require different loading determined by the RTC internal capacitance of the oscillator... clearly the OP is using the wrong device.
The best method would be to [Gasp] read the data sheet and buy the one recommended for his RTC chip..
There are no one fits all device although the frequency marking are the same.
Doc
37  Using Arduino / Microcontrollers / Re: What battery is best for Arduino Pro mini with nRf24L01 on: September 04, 2014, 09:58:13 pm
a 9V battery is a most poor choice for an uno project as it is capable of perhaps 50mA for 1.5 hours as the battery capacity rarely exceeds 100 MAH max
A 2S 1000 MAH Li-Po is IMO the minimum that can be used for long term rechargeable use with an Arduino 5V linear regulator as it causes the least amount of regulator power dissipation or power lost. I buy 7.5V 2A wall warts for my projects that require AC power
For my own use I prefer a buck boost mode switcher to convert the 4.2V max of a single cell to 3.3 V output and use my project @ 3.3V. Although buck boost converters rarely exceed 85% efficiency they are Much better than a power supply derived from a linear regulator
AS has been mentioned the Arduino 3.3V source is only capable of perhaps 50 mA and has one (C13 or C14) 1 uF capacitor for the bypass capacitor for the LP2985 3.3V linear regulator depending on the board.
Once as a test I connected a GPS receiver to a Pro mini and viewed the time from TinyGPS++... No LCD just the serial Monitor...
It lasted for 2 hours before the GPS device failed and this was with a buck mode switcher to convert 9V to 3.3V..
About 35mA for the PRo-Mini and 30 mA for the GPS U-Blox NEO 6 receiver..
3 AA cells connected to the Vcc connection operated the thing for 3 days (probably used batteries too)..

Doc
38  Using Arduino / Programming Questions / Re: Multiple IR recevers using IRLibrary on: September 04, 2014, 05:27:40 pm
Great construction example, Shows an active mind aware of the capabilities of the IR detector..
My take would have to cut the "funnel" off of those crinkly water bottles and paint them with an opaque... Water based paint
for however many light shields were required.. If you retain the caps it's a simple matter to make a hole in the cap big enough to clear the lense or the IR detector, glue the detector to the top of the cap... and using masking tape to cover the last 10 mm of the sensor wires and paint the whole assembly again with a black and IR opaque paint..
Mounting them with hot glue and wiring the devices to  a sensor shield with the common 3 pin servo extension  cables would be trivial.
I'd also test the paints for both IR transmissivity and reflection.. For a few dollars more plain old ABS tubing and some reducers and end caps might look more professional and might be easier to gain the non reflective properties that the Play Dough has...
The drawback is the playdough is a flour and salt + water mixture that will dry out and possible crack..
The cardboard or 'printed light shield is still a necessity to help prevent crosstalk.. With some black cheese cloth and an outer housing it could look very professional for very little cost as leftover latex paint can usually be had for the asking and the black pigment might well be finely ground charcoal... I would estimate the total cost might be a quid or so... Though oi'm not a brit...
 I should think an Euro would  be the most for recycled materials...

Doc
39  Using Arduino / Programming Questions / Re: Does Arduino Uno hibernate by itself or why does my scetch seem to halt? on: September 04, 2014, 01:00:59 am
There are also a few of that are capable of speaking several languages.. I can read and speak some spanish, some italian, some German and a little french and I find your comment somewhat condescending as it is your issues that I want to try to solve.
This Forum is a big part of my education.. along with books on  both my Kindle Fire and my Nook book readers that are never more than two to four meters away from me.
Even with Google Translate, which I use frequently as it is a serious part of my education... As well,
Google is a source of possible solutions to or direction to the answers required.
I am a 68 year old retired engineer trying to learn a new and versatile, valuable programming language... 
I realize that Google is my friend and I frequently use it to find solutions for those that can't or won't make the effort to do so..
I use it to find answers to what I don't understand... Yet.

Docedison
40  Using Arduino / Microcontrollers / Re: Migrating from an ATmega328p to a larger uC on: September 03, 2014, 09:20:13 pm
Paul Stoffregen has a nice arduino 'mostly' compatible product... Even uses the same IDE with his software addition to the Ver 1.05 IDE it's an add on that doesn't incapacitate the basic Arduino IDE use.
It runs Arduino code too and is a lot more capable. A 32 Bit ARM processor board similar to the Pro Mini in size called the Teensy3.1
Although the Arduino paradigm is still my favorite by a long shot because, although I have 20+ years in hardware design my code skills are poor at best compared to PaulS or Awol or any of the other heavy hitters... So I get the best of both worlds.
Although the Teensy lacks really strong pin drive capacity, it's other features make it ideal when casting about for a bigger controller...
Perhaps it's real lack is the plethora of pins that a Mega or a Due has (34 for the Teensy 3.1) 256K of flash and 64 KB of Ram make it very attractive for fast (overclocking @ 96 MHz) projects.. I use smaller processors (Mega1284 Bobuino) for high pinout devices like large GLCD's or large keyboards... I have a project involving a scrolling display and a 5" GLCD with a 40 key tactile keyboard and for that I use a Mega for display(s) and keyboard control...

Doc
41  Using Arduino / Programming Questions / Re: Illogical Type Changing on: September 03, 2014, 07:55:55 pm
@ Nick
+1...
Thank you for a succinct answer for a lot of questions re types and casting

Doc
42  Using Arduino / Microcontrollers / Re: IC PROGRAMMING on: September 03, 2014, 07:34:06 pm
LarryD had the first part right I for Input (power and ground) IO for Input/output and C for control..
However the OTP issue is just that it cannot be reprogrammed.. Unless there is a glass (Quartz really) to  enable to erase the contents  before reprogramming as OTP means One Time Programming..
Very common with many controllers from the 90's and early 2000's
In those days I used PIC controllers which were OPT devices, although in those days there was a PICXXXX _ JW part that had the window for erasing the EEprom. They were Expensive but invaluable for code development as one could use the same part hundreds of times because it was Ultraviolet erasable...
Your part doesn't seem to be any Atmel device however?

Doc
43  Using Arduino / Microcontrollers / Re: Unknown Status 0x00 error when burning bootloader on: September 03, 2014, 02:10:11 pm
Did I misread your comment that the  dc voltage was .00 4 V on either side of the Crystal?.
If so I would first check that the wiring to the Crystal and the loading caps (22 pF?)  Don't have a short to ground.
One of the Crystal leads goes to the output of an inverter and should be as volt or more as it is the drive to the Crystal....
I would power up both a working board and one of you non working boards. Comparing the dc voltage against each other followed by dispowering both boards and making resistance measurements to ground might point you to the right place...
I suspect that is your real issue. I'd suspect a wrong value or component or short / low resistance error is your real issue.

Doc
44  Using Arduino / Programming Questions / Re: Serial read more than 64 bytes? on: August 29, 2014, 01:17:51 am
@ Nick G... +1

Doc
45  Using Arduino / General Electronics / Re: Bread Boards & wishful thinking? on: August 25, 2014, 08:36:08 pm
One last item would be replaceable contact strips for the few that will eventually go bad..
If I just had $10.00 for every hour in the past 40 years that I've spent in locating and rewiring or replacing whole breadboards..
My retirement might well be on an island in the Pacific instead of hot and humid Southern California...
Nice dream.. Though.

Doc
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