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1  Using Arduino / General Electronics / Charging Current calculation of battery on: June 29, 2014, 02:29:52 am
hello Experts,

I want to know how to determine the charging current and voltage for rechargeable AA batteries. I want to know about NiCd, NiMh, Lead-Acid batteries(6V, 12V) charging currents. Now I'm having a 1.2V, 850mAh NiCd battery, I was designing a circuit for that I need this charging current.

2  Topics / Robotics / Re: Building a completely DIY RC plane with arduino on: May 23, 2014, 03:09:57 am
Thank you.  smiley

I have checked the link and that is comparatively affordable kit price.
What kind of material can be used for the wings other than the blasa wood?
Can you suggest me some basics about flying the RC planes, and also the design aspects to be considered.
3  Topics / Robotics / Building a completely DIY RC plane with arduino on: May 20, 2014, 12:22:21 pm
Hi All,

I'm planning to make a complete DIY RC plane. But I'm new to aerodynamics, RC plane material and the design aspects. I need your guidance to make it successful. What i need to know are:
What kind of material is best for making the plane?
comparing the price and ease of availability which is better material, I planned to make it with thermocol, sticking two layer of thermocol and placing some strong material for rigidity in between? Is it possible? Are thermocol good to make the air foil shape?

What should be the minimum rating of the BLDC i need to select?
Which will be the cheaper and better power source for the electronics?
Help me to get a proper design of the wings, shape, fuselage?
Where should i put the motor? in the fuselage or two motors below the wings?? which is better and easy?
what all kind of settings should be included to get a flexible control?
And also about the propeller.

I would like to continue this discussion till my design complete, so people who want help for this subject can refer from this, so kindly put your suggestion.  smiley
Thank You
4  Using Arduino / Project Guidance / Want to convert some ray data to required format on: May 18, 2014, 01:38:32 am
Hello Experts,
I need a help, I have the attached file, in that I have a huge amount of 15-bit data arranged in different rows of 32767. This is a simulation result. So I want to convert each of the rows to 77 bit data by just append the same row content to the end of that row itself. Its very urgent, can anybody help?
5  Using Arduino / General Electronics / Re: Analog Input Readings on: May 15, 2014, 06:12:30 am
Post you circuit and the code you have tested, then only can debug the problem. There is no need for any interface or Pull-Ups for analog accelerometer. You can simply connect to the analog input and read and print continuously in a while loop to test the sensor.
6  Topics / Device Hacking / Re: car fm radio antenna hack on: May 15, 2014, 05:35:58 am
 Always go for the simple best way to achieve your goal. I suggest you to build a simple stereo FM transmitter and connect it to the phone and transmit it. Use a low power FM transmitter, you can get very cheap single chip FM transmitter, which will works well with a small number of discrete components outside the IC.
7  Topics / Robotics / Re: External power crisis for my robot on: May 14, 2014, 02:55:41 am
If you use two 9V battery parallel there is a chance for working. But 9V battery are having less Ah, so better to use rechargeable cells. with > 700mAh.
8  Using Arduino / General Electronics / Re: Potentiometer as voltage divider on: May 08, 2014, 01:15:41 pm
ya, I'm sorry  it was a mistake, when i drawn the circuit speedy it happened so. Thanks for the correction.
9  Topics / Robotics / Re: External power crisis for my robot on: May 08, 2014, 12:41:57 pm
Use a battery with more 'Ah' rating, preferably rechargeable cell.
10  Using Arduino / General Electronics / Re: Potentiometer as voltage divider on: May 08, 2014, 12:33:12 pm
From the question i think that you want to give some voltage randomly to the ADC from a 9V-12V supply, so you want to reduce it in the range of 0-5V, so you can use the following circuit, the diode is a 5.1V zener to protect your arduino from over voltage.
11  Topics / Robotics / Re: Help improve this code on: May 01, 2014, 02:30:23 am
Check your Bluetooth modules default baud rate. is it 9600? Check the module using a direct serial interface and and read the received code for each character you sent by the software to verify is there any extra characters coming with each frame. 
12  Using Arduino / General Electronics / Re: JY-MCU bluetooth module V4.0 alternative on: April 25, 2014, 08:09:33 am

I think in this case you need a level converter between 5 and 3.3V. I have tried some thing like this to interface a sim card directly to the 5V microcontroller, at that time i used a simple level converter using a not gate 74HC04 and given 3.3V to this inverter IC, so 5V from the pic will be converted to 3.3V. You can also use a transistor drive circuit i have attached. I think it should work.
13  Development / Other Hardware Development / Re: 2.4 Ghz Wireless camera Receiver on: December 24, 2013, 12:14:13 pm
Thank You  smiley
How to find it? I didn't found any technical details about it. smiley-sad
14  Development / Other Hardware Development / 2.4 Ghz Wireless camera Receiver on: December 22, 2013, 11:58:57 am
I have a wireless camera, similar to this model ( . I lost the receiver module, is there any way to make a receiver for the camera transmitter. I have found that it is a 2.4Ghz communication. Does a similar models receiver or a 2.4Ghz video receiver satisfies the need??
Thanks  smiley
15  Topics / Product Design / Interfacing PIR module for security system on: July 23, 2013, 07:43:33 am
Hello All,
I'm planning to make a security system in my home with PIR modules and Arduino. I want to place PIR module at all the sides of home. My doubt is can we run the wire connection for these PIR module to different positions of my home through the electrical wiring pipes?? so that i can put a single controller for all the sensors.Is there any interference problem?? Is there any chance to get my circuit damaged. All the sensors are running at 5V with the power supply circuit near the controller.

Thank You
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