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16  Using Arduino / Programming Questions / Re: code help regarding reading multiple analog inputs on: April 07, 2014, 04:19:06 pm
Arduino has only one ADC, and one sampling and hold (S/H) capacitor is used for different channels. So , observed behavior is normal, to prevent inter-channel interference BOTH inputs have to be connected to low impedance (relatively to sampling rate)  source. Ground other input to track software issues.
17  Topics / Home Automation and Networked Objects / Re: android arduino lamp on: April 07, 2014, 10:35:01 am
Start from ArduinoBlinkLED here:
https://github.com/Lauszus/ArduinoBlinkLED What hardware for communication you are intent to integrate?
18  Using Arduino / Sensors / Re: How to measure amplitude value of a sine wave? on: April 07, 2014, 10:24:18 am
Depends on magnitude, as you probably know, arduino (UNO - don't know your board) has max. resolution 1 mV using internal reference.
To have adequate results, I think at least 50 mV of waveform should be present at input. Than you may try accelerate ADC, up to 4 MHz clock or so, running undersampling about 300 kHz , if bandwidth of the input lower than 150 k you may get some data.
Other things accuracy, for better than 5-10 % external circuitry is not an option.
19  Using Arduino / General Electronics / Re: picture in picture chip on: April 06, 2014, 04:22:09 pm
SDA 9086 - SDA 9087 - SDA 9088
20  Using Arduino / Programming Questions / Re: How to set the timer1 to produce interrupt once every 200us? on: April 05, 2014, 09:42:43 am
Download TimerOne and look inside
21  Using Arduino / Project Guidance / Re: First timer, advice for driving seven 7 digit displays and two 8 bits PLLs on: April 02, 2014, 07:17:06 pm
Have you seen playground?
Quote
Seven segment displays (See also the "LED Multiplexing" sections. Here we have displays supplied with character generating control circuitry, minimizing the work you have to do.)

http://playground.arduino.cc/Main/InterfacingWithHardware#Output
22  Using Arduino / General Electronics / Re: Help to switch power to analog sensors on: April 02, 2014, 08:52:33 am
Google has plenty of circuits, you may choose one and post a specific question if there are any doubts.
https://www.google.com/search?q=mosfet+high+side+switch&sourceid=safari&ie=utf-8&oe=utf-8&channel=suggest
23  Using Arduino / General Electronics / Re: Help to switch power to analog sensors on: April 02, 2014, 07:43:36 am
You say 5 (five) sensors, 4mA each = 20 mA. Do you mean 50 (fifty)?
24  Using Arduino / Project Guidance / Re: 24bit SPI word size for AD5686 Chip on: April 01, 2014, 06:11:00 pm
It 'd be nice to know what arduino board. Due has SSC, and things may be different
25  Products / Arduino Due / Re: Continuous SPI for multiple bytes on: March 31, 2014, 04:50:52 pm
 I wander, what they may respond, if there is an ARDUINO library experts working in TI ?
26  Using Arduino / Programming Questions / Re: Analog Read question? on: March 30, 2014, 12:07:10 pm
You may use analog as digital inputs, on UNO board digital 14 - 19.
27  Using Arduino / General Electronics / Re: LED And PhotoResistor on: March 29, 2014, 04:01:46 pm
Swap resistor and photoresistor, than more lights 'd lower voltage.
28  Using Arduino / Programming Questions / Re: How to disable Arduino Environment's use of Timer0? on: March 29, 2014, 03:57:04 pm
I used Timer0 w/o problem, just not include any of the function you mention in orig. post. Than you define your settings calling hardware registers in the setup.
Any reason not to use Timer2, they pretty match same in functionality?
29  Using Arduino / Project Guidance / Re: RF detector falling off for some reason on: March 28, 2014, 05:12:48 pm
May be link was corrupted, here I attached a schematics:

30  Products / Arduino Due / Re: Continuous SPI for multiple bytes on: March 28, 2014, 05:02:34 pm
I'm not sure about 10th of MHz, but to go faster you better use DMA + SPI channel, w/o a library.  Look inside spi.c file for start.
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