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1  Using Arduino / Project Guidance / Re: I need some help programming the arduino on: Today at 08:47:16 am
Here is the MQ-9 datasheet
Link on the playground for MQ9 sensor
http://playground.arduino.cc/Main/MQGasSensors

To detect Carbon Monoxide CO you need low temperature (heated need to be 1.5V at about 50mA).
The output is an analog signal and can be read with an analog input of the Arduino.
2  Using Arduino / Project Guidance / Re: what is E and M in motor shield on: April 22, 2014, 10:01:53 am

Which E and M in motor shield you refer to?

We are no good in mind reading.

3  Using Arduino / Project Guidance / Re: Button Project on: April 21, 2014, 10:17:24 am
This Button library
https://github.com/carlynorama/Arduino-Library-Button
4  Using Arduino / Project Guidance / Re: Green Laser 3VDC Ebay on: April 21, 2014, 03:47:15 am
Have you try with 2 AAA batteries?
3.3V should be okay, have you connect both 3.3V and Gnd pins?
5  Using Arduino / General Electronics / Re: Hi all need suggestion on: April 20, 2014, 08:12:33 am
You can use circuit like this



or you can get it from eBay for just under USD $3.0

6  Using Arduino / Project Guidance / Re: Trouble with Robot on: April 19, 2014, 08:03:59 pm
Why doesn't the arduino run the proper sketch with a 9v via the vin port?

Quote
You can't run motors off of a 9V battery so don't waste your time/batteries!
Use a big Lead Acid or NiMH battery pack. Its also very much suggested that you set up two power supplies (split supply) one for the Arduino and one for the motors. 99% of 'weird motor problems' are due to noise on the power line from sharing power supplies and/or not having a powerful enough supply! Even small DC motors can draw up to 3 Amps when they stall.
https://learn.adafruit.com/adafruit-motor-shield-v2-for-arduino/powering-motors
7  Using Arduino / Project Guidance / Re: can i use Arduino micro-controller to copy files from SD card to External HD ?? on: April 09, 2014, 05:29:32 am
You will have better luck using raspberry pi
8  Using Arduino / General Electronics / Re: Battery charger on: April 07, 2014, 10:13:53 pm
No,

 IBat = VProg/RProg X 1200 (VPROG=1V)

750mA = 0.75A

0.75 = (1) * 1200 / R
R = 1200/0.75
R = 1600 Ohms
R = 1.6K Ohms

So you have use 1.6K ohms resistor for RProg.
9  Using Arduino / General Electronics / Re: Measuring Voltage of Battery on: April 05, 2014, 10:25:56 pm
Read this
http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/
10  Using Arduino / General Electronics / Re: Battery charger on: April 04, 2014, 06:12:42 pm
Yes, reference to the datasheet you can calculate the resistor base this formula  IBat = VProg/RProg X 1200 (VPROG=1V)



Thank you guys!

Quote
240mhA battery, your charge current change to 130mA
So this means that i always have to choose the lower value when i don't have the right value?

Also, can i charge this battery with that charger:
http://www.ebay.com/itm/BLC-2-Battery-for-Nokia-3310-3330-3510I-3320-5510-6800-6810-6650-3410-/360788753110?pt=LH_DefaultDomain_3&hash=item5400af7ad6
This is a 3.6V battery with 750mA
yes
11  Using Arduino / General Electronics / Re: Battery charger on: April 04, 2014, 09:19:52 am
Yes it can, but you have to set to correct charging current.
How?
Look at the Charge Table on the page, you have to change the value of the resistor Rprog
Since you are using 240mhA battery, your charge current change to 130mA so you have to change Rprog to 10K ohms
The resistor need to change was circle in RED
12  Using Arduino / General Electronics / Re: Battery charger on: April 04, 2014, 07:35:35 am
Yes it can, but you have to set to correct charging current.
13  Using Arduino / Project Guidance / Re: How to run a micro without USB? on: April 03, 2014, 07:56:25 am
This may be a really stupid question - What make you think that the Arduino Micro had two native serial port?
14  Using Arduino / Project Guidance / Re: plx daq and lcd keypad on: March 31, 2014, 10:45:36 am
Read this from Robin2 work on Demonstration code for several things at the same time, to replace your delay(30000) in the program
http://forum.arduino.cc/index.php?topic=223286.0
15  Using Arduino / Project Guidance / Re: How to make a waveform generator with frequency of 20hz-20Mhz on: March 31, 2014, 09:14:21 am
0-40Mhz, Sine wave generator for $25 using the AD9850 which is a Direct Digital Synthesis sine wave generator able to control by Arduino Uno.
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