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31  Using Arduino / Project Guidance / Re: I am soooo lost!!!!!!!!! on: February 14, 2014, 06:21:39 pm
32  Using Arduino / Project Guidance / Re: Digital LED Clock Project on: February 10, 2014, 07:55:32 am
Is a good practice to attach picture image file then other document for easy access,

You can use this Seven Segment Display Library to allows an arduino to easily display numbers in decimal format on a 4 digit 7-segment display without a separate 7-segment display controller.

you can also use MAX7219 a separate 4 digit 7-segment display controller for your Hours and Minutes display.

for your 60 GREEN LED Second counter, you can use multiplexing two of the 74HC595 shift register to have 8X8 outputs.
33  Using Arduino / Project Guidance / Re: Need coding Help for keypad and LCD sheild interface on: February 04, 2014, 04:57:25 am
I have a Alarm clock on an LCD keypad shield that you can see how to get input from the keypad.

34  Using Arduino / Project Guidance / Re: DC Current / Voltage / Power Monitor on: February 03, 2014, 07:03:38 am
How many volts and amps you talking about from a two panel photovoltaic system?
35  Using Arduino / Project Guidance / Re: Cheap 7 segment & DS1307 clock project on: February 03, 2014, 06:54:47 am
Check this out
Alarm clock from Atmega328 and 7-segment display by Nick Gammon
36  Using Arduino / Project Guidance / Re: Voltage regulator with no dropout voltage on: January 30, 2014, 08:47:57 pm

Base on the block diagram, the output of the PicoUPS-120 was not fix at 12V, it can be 21V when using your 15v torroidal transformer or 10V to 14.5V using SLA battery.

Your 15v torroidal transformer which output 21V was way to high for the PicoUPS-120 which have a max of 18V

Use Buck-boost switching regulators. They will maintain the desired output.
Step-Up/Step-Down Voltage Regulators Buck-boost and SEPIC converters work with input voltages that are higher than, equal to, or lower than the regulated output voltag
37  Using Arduino / Project Guidance / Re: wireless controled servo with only one arduino on: January 25, 2014, 09:50:20 am
You can use this wireless remote switch replace your two buttons

So you can use one arduino uno at the servo side.
38  Using Arduino / Project Guidance / Re: wireless image transmitter on: January 25, 2014, 08:05:32 am
AWOL:  i'm using an Li2 Hexapod customized atmega 32 bit arduino board.

Li2 Hexapod Kit using Atmega32 is a 8bits MCU not 32 bits
39  Using Arduino / Project Guidance / Re: trackin with 3 sensor HCSR04 on: January 24, 2014, 10:56:57 pm
Here is the order of operator precedence in C++.

(distanceDer > 10)   &&   ((distanceDer < 20) || (distanceIzq > 10))   &&   ((distanceIzq < 20) || (distanceCen > 10))
is difference  from
((distanceDer > 10) && (distanceDer < 20))   ||   ((distanceIzq > 10) && (distanceIzq < 20))   ||   (distanceCen > 10)

40  Using Arduino / Project Guidance / Re: trying to figure out Secrets of Arduino PWM on: January 23, 2014, 07:25:00 am
_BV() Bit manipulation function
AVR Libc Reference Manual

OCR2A & OCR2B only change the PWM duty cycle

Check the datasheet page 94 for more info on PWM
41  Using Arduino / Project Guidance / Re: Smartest approach to uploading a sketch to several hundred Mega 2560's? on: January 22, 2014, 07:51:38 am
Or you can make a standalone-avr-chip-programmer using you arduino Mega. All you need to is wire VCC, Gnd, MISO, MOSI, SCK, RST and XTAL1 (if you need external clocking).
42  Using Arduino / Project Guidance / Re: How to implement PID or simular? on: January 21, 2014, 07:33:55 am
The Segway: Theory
Balancing robot for dummies
arduino - segway
43  Using Arduino / Project Guidance / Re: free-spinning potentiometer? on: January 20, 2014, 07:52:13 am
You can use gray code encoder wheel

Wind Direction via 4 bit Gray Code Optical Encoder
44  Using Arduino / General Electronics / Re: What kind of connector is here? on: January 11, 2014, 01:19:26 am
This call the SlimStack Plug connector
45  Using Arduino / Project Guidance / Re: Controlling the Arduino with an Android over Bluetooth? on: January 11, 2014, 12:23:16 am
You can use this tool to check on what Arduino send.
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