MultiWii

Great idea. Most will agree that the multiwii code has some complexity. Next it supports a variety of flying devices so code is both generic and specific...not much of a problem if using Eclipse for the IDE since it will grey out any blocks not active since a define didn't include them. Nevertheless...

The HCSR04 is an inexpensive device. As with all sonars it pings and then an echo comes back or not. It is probably only useful up to 3 meters though the specs may say 7 meters. The issue that has been pointed out before is that by nature this is a blocking process. Since an echo can come back at an...

All GYROs will drift it is just a matter of how much. The GYRO is the principal sensor mostly because it is a first order derivative and the second order derivatve ACC is comingled with the gravitational acceleration. OK so we have angular rate of change where as it would be better to have just the ...

First this is remarkable code that makes my Quadp fly. Now to the "but.". Yes a newbie always has a "but" observation. Now a camel is perfect for the dessert but it is a bit ungainly...this is because it didn't originate in the dessert; it adapted to it. Multiwii has done well to...

Well, the pi is unix based....but it does have GPIO...now unix is for heavily interconnected devices like a PC on a network...this means unix ( debian version on the pi) is loaded with protective code. You'll need to run as root to tunnel through the security to get low level access to the GPIO...it...

Well bit banging a serial pin can work. The issue is the timing the bit must be read around mid bit which often means the need to sample at 16 times the bit rate to measure a mid point. Rs232 is asynchronous so the receiving processor must always be ready to see the transition to the start of the bi...

Well you need to get the voltages firmly decided. If everything is at 3v or if everything is at 5v then all you need will be pull ups 2k or 2.7k it isn't critical. Now if the levels are different then know that I2C is wire ore'd so one side pull up to 3v isn't 5v to the other side. The level shifter...

Some boards won't have pull ups. Weak pullups can be for some chips enabled within the chip by setting a fuse. As far as the board goes ...with the power off check the resistance one by one between SDA and SCL to Vcc ( positive) or it might be Vdd on the board schematic. If you see several k of resi...

The sensors MPU 6050 5883 MAG and 5611 BARO are available (E-Bay) soldered to a 2Cmx2cm board with a 8x1 pin 0.1 " header. I choose to use the Crius AIOP board to get the interface and the atmel 2560 plus the sensors. Now with I2C it is easy to piggy back in my case a fast up to 140 Mhz PIC 24 ...

Thank you thank you thank you Danka Danka Danka! Sebbi ..I spent several hours trying to chase down a solution to a win7 64 pro and Eclipse that would not upload multiwii to a atmel 2560. Ardruino on the same PC would upload so it seemed to be an Eclipse issue. Turns out using the Windows7 command p...