I am testing DCM update with PI drift tracking. I am using one closed loop with gravity vector and other for magnetic field vector (3 axis vector), i am comparing measured vector with my local magnetic field vector. it works ok!i have read than magnetometers can not be used with electric motors, but i have tested this board over a electric plane, and i can see noise due electric motor is very very small, it is dificult to see any effect in algorithm result.Thanks to Bill Premerlani and Paul Bizard for his DCM method description.jlcortexnmine.com
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I am working in my bidirectional transmitter. i has built parts in plastic with my hobby cnc machine. it looks very technical device!!!i have not received PCB yet.i post some pictures of not finished assembly.We are testing XBee Pro Series 2 with ZB firmware now, it seems than 5 Kbytes/sec is possible. We publish transfer rate speed as soon as we finish testings.jlcortexnmine.com
It is a folding 6 rotor helicopter, inspired in X6 helicopter.i would like to build in polyethylene technical plastic, it is light, shock resistant and easy to work with my cnc mill.propellers are in a circle of 500mm diameter, i think best option in order to use standard RC parts is to use 6 x 12" counter rotating propellers.3 (counter rotating) propeller of 12" have an 8% more surface than 4 propellers of 10" (like typical quadrotors)Probably 14" propellers are better in order to get more performance but i think is not possible to find very low Kv motors with the necessary low power and low weight.Any idea are welcome!jlcortexnmine.com
Posted by jlcortex on February 25, 2009 at 11:30am
Hi,I am working in this project, it is a bidireccional RC transmitter.Sometimes, i think than conventional transmitters start to have no sense for uav projectsThis is a proyect with a small board with ARM7 (NXP LPC2xxx) and a Xbee PRO with 60 mW (similar performance than standard transmitter) and a Bluetooth module to connect with a PDA.This board have 9 analog inputs for joysticks, and other controls, battery voltage..., it try to be a whole solution with charger connector for charge transmitter battery and PDA battery...We are working in a graph tool in order to show flight instruments in PDA.jlcortex
Posted by jlcortex on September 23, 2008 at 6:30am
Hi, I would like to present my project, i know there are a lot of uav projects but i think it is a amazing balance of price, performance and simplicity! It is based on OLIMEX E2468 board and Sparkfun sensors.Features4 Layer board with ground plane for high noise immunity I/O Connectors:- 8 x Servos - Standard pitch 2.54mm- 4 x speed input (for sensors, motor RPM, or PPM capture)- 2 x CAN BUS with transceivers - Header 2.54mm- 10 x Analog Inputs (8 x 16bit - 5 used for gyros and pressures) general propose 0-5v (for sonar altimeter for example)- 4 x UARTs (one used for USB port) (3.3v level) for GPS and MaxStream XBEE-Pro 60mW radiolinkOnboard sensors options:Accelerometers (two options):- MMA7260Q 6g- analog- LIS3LV02DQ digital 1mg resolutionGyros:- Analog Devices ADXRS300 (any other possible!)- Compass (two options):- HM55B 2 axis 6 bit- PNI Corp's MicroMag 3-Axis MagnetometerOnboard Pressures:- MPXV5010DP 1.45psi (Airspeed)- MPXA4100A6U 15.2PSI (Altitude)Features from Olimex LPC-E2468 development board:- MCU: LPC2468, 16MB SDRAM (more is possible if necessary), 128 MB- Flash, standard JTAG connector for debugging with ARM-JTAG- Ethernet 100MBit- 2x USB hosts- USB-to-RS232 converter device connected to LPC2468 UART- SD/MMC card connector- Dimensions: 90x60mm (3.54 x 2.36")we have make all hardware access rutines in C, included SD card writing and reading with DMA!!!it is a simple micro boards, it is ARM7 so it is easier to program than any 8 bit micros (pic, avr...). Power and memory are enought for the AHRS's Extended Kalman Filter and for another EKF for INS system.this board can run under ulinux!! (we are not using it)It has been designed and build for "UNIVERSITAT POLITECNICA DE VALENCIA", special thanks to DISCA departament.Jose LuisnMine.com
