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1  Using Arduino / Project Guidance / Re: On Board Computer for RC Helicopter on: December 15, 2012, 03:55:56 am
The heli is big a 600 class (1200mm)

The bt idea was to get the data out of the heli on the field, for realtime i would need some with more range, probably wifi.

one of the things i wanted to do with this projects was to do my first PCB, so this will be using a standalone arduino board, with the atmega328p.
2  Using Arduino / Project Guidance / On Board Computer for RC Helicopter on: December 14, 2012, 05:19:26 pm
Hello, i been playing a bit with arduino and RC devices for a bit now, and i would like to work on a project for a bit more "bigger" than a car.

so i thought and on board computer could be a fun project to work on. i have an initial schematic for it already.

a few of the things i would like to do are:

- replace the RC gyro with the one in the IMU
- failsafe while in-flight if connection is lost with transmitter enter in auto hover mode.
- provide full 6V to the servos for maximum performance
- assisted in-flight controls

Missing:
- a logging module could be useful (blackbox style)
- RPM sensor (not sure what the best approach for this could be yet)
- temp sensor (not really sure if this is useful or not)
- bluetooth with a android companion app to visualize data (real-time data / something with more range that bluetooth?)
- camera stabilizer

i'm aware of the ardupilot project but i dont want a UAV.

what do you guys think? comments? suggestions?

also i have to add i'm very new to electronics, i'm starting to learn am using this project as a learning opportunity.
3  Using Arduino / Motors, Mechanics, and Power / Re: Servos at 6V on: December 08, 2012, 10:40:27 am
thinking about this i found out the LM25118 by TI this will be able to hold a max of 20 amps.
4  Using Arduino / Motors, Mechanics, and Power / Re: Servos at 5V on: December 06, 2012, 07:03:04 pm
yeah i saw thoose zoomkat, but that would remove the whole learning experience!
5  Using Arduino / Motors, Mechanics, and Power / Re: Servos at 5V on: December 06, 2012, 06:34:17 pm
ah thanks a lot Grumpy_Mike, i believe this could work http://www.pololu.com/catalog/product/791

retrolefty, i didn’t thought about the 1A, i will keep it in mind.

the attached image is the basic idea of what i thought, i may end up integrating the boost converter but i don’t see the necessity of it for now.
6  Using Arduino / Motors, Mechanics, and Power / Servos at 6V on: December 06, 2012, 05:39:49 pm
so i been working with some servos on an RC project i'm working on. and here is the thing most servos have 2 modes

Speed @ 4.8v:  0.21 sec @ 60 deg.
Speed @ 6v:  0.16 sec @ 60 deg.
Torque @ 4.8v:  3.3 kg.cm
Torque @ 6v:  4.1 kg.cm
(also seem some high speed servos that only work at 6V)

i would like to get them working on 6V using an separate battery for the servos, so i'm thinking in building a power distribution board for the servos, so i have a 2 cell 7.4v battery my first thought was to use a 7806 Voltage regulator but what will happen when the battery drops bellow 6v? i been thinking that maybe using a charging pump but most of them seem to be for 5/5.5V like the LTC1751, MCP1253, TPS61200.

so maybe i'm approaching this the wrong way, can anyone give me pointers to get in the right direction?

i may have to add i'm relatively new to electronics  (learning my way trough it now)
7  Using Arduino / Microcontrollers / Re: diecimila to uno on: December 04, 2012, 11:30:06 am
thanks i already did it, and i'm giving it a test drive. i bought blank chips and burn them using arduino as an ISP.

so far no issue,
8  Using Arduino / Microcontrollers / diecimila to uno on: December 04, 2012, 04:01:56 am
i have and old diecimila board arround

http://arduino.cc/en/Main/ArduinoBoardDiecimila


i was wondering if i could change the pic to a 328p with an uno bootloader and use it as an uno board.

anyone done something similar before? is there any drawback or problem i should expect?
9  Using Arduino / Project Guidance / Re: Reading data from RC Receiver trouble with noise on: December 02, 2012, 10:33:28 am
this is the current status of the code https://gist.github.com/4189325 that is working right now i also added a photo of the wiring I'm using.

i moved to eclipse, because i did not like a lot the way i had to organize the code in the arduino ide.

i'm probably going to add some filtering for the signal (something small to about the jitter in the values)
10  Using Arduino / Project Guidance / Re: Reading data from RC Receiver trouble with noise on: November 22, 2012, 02:12:24 pm
ah right. i need to do some research to see how can i use pinchangeint within a class.


i already have it working without RCArduinoFastLib, i just wanted to organize everything intro classes for easy managing and extending if needed.

btw i'm not intending to build a lib out of this i'm creating classes with very specific uses in mind and i not planning on adding any flexibilities into them for a general purpose use as yours.


EDIT 1:

adding rx= this; in the class fixed the issue and i'm seeing the correct values.

EDIT 2:

thanks for pointing that out DuaneB, i have the code working now perfectly its seems to be reporting the correct values no problem, i just updated the gist with a working version right now https://gist.github.com/4131554.

i have a question while reading your code i know understand more or less what everything does except for this line while setting the timer OCR1A = TCNT1 + 4000, removing the + 4000 since to have no effect whatsoever.

my next step for this will be to multiplex the channels toguether to handle more channels (in case i ever need them) and add code to make this an I2C master making this a dedicated ATTINY85 receiver decoder.

11  Using Arduino / Project Guidance / Re: Reading data from RC Receiver trouble with noise on: November 22, 2012, 09:56:25 am
i was thinking in something like this https://gist.github.com/4131554

as you can see is bastly based on your code, i havent test it yet as i'm not home with access to my arduino yet.

but thats the idea i'm getting so far.

i dont care about server becouse my plan was to use something like an ATTINY45/85 to process RC signal and them the ATMEGA328p for everything else.
12  Using Arduino / Project Guidance / Re: Reading data from RC Receiver trouble with noise on: November 22, 2012, 07:58:05 am
becouse i dont want to use any servos so i dont want to include the full functionaly of the RCArdionoFastLib i just want to read from the receiver.

that and i usually like to understand what i'm doing.

13  Using Arduino / Project Guidance / Re: Reading data from RC Receiver trouble with noise on: November 22, 2012, 07:45:08 am
Hello DuaneB,

i'm trying to undestand what RCArduinoFastLib is doing, but i hit a small roadblock that i'm sure is just something i'm missing.

if i try to setup the timers as you do basicly copying the begin method my arduino hangs and restarts itself, but if i use the copyed method and import your lib everything works as expected.

does importing RCArduinoFastLib set anything else? i cant seem to see it.
14  Topics / Product Design / Re: Arduino ISP Programmer Shield on: November 22, 2012, 04:28:40 am
thanks i will take a look at that.
15  Topics / Product Design / Re: Arduino ISP Programmer Shield on: November 21, 2012, 04:29:09 pm
i think i may have express wrongly.

i would like to make my design also program attiny45/85 but i find that dip switches are messy and can be miss configured easily.

i dont have a very big knowledge of electronics parts and i was wondering if there is anything i could replaces the dip switch that could handle the internal logic needed to know if its an attiny45/85 or a atmega328 with something as easy as clicking on a push button.
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