Hi guys,
I'm new here an new to hobby RC in general. I recently decided to undertake creating a quadrotor.
I've never really been into flying before, but wanted to get back into microcontrollers and figured that this could be the challenge I was looking for.
My main aim out of this is lift-off. A steady hover and slow back and forth motion is all i want [right now].
I have started ordering my parts and here is where I am. Not all parts are going to be mounted at the same time. I just want to try out different technologies and see how they work.
What I currently have:
1. 4 wireless transceivers (433mhz)
2. 4 bluetooth modules
3. 1 ARM 7 LPC2368 eval board
4. 1 10DOF IMU
5. 4 DJI2212 motors (http://www.ebay.com/itm/4x-DJI-2212-920KV-Brushless-Motor-for-F330-F450-F550-X525-Quadcopter-Multirotor-/221666748033?pt=Radio_Control_Parts_Accessories&hash=item339c5e2681)
6. 8 30A ESCs
7. Wood pieces from Michael's which will be my frame.
8. 2S 50C LIPO battery
9. ATMEL ARM M4 board
What I need to buy:
Propeller (Carbon Fiber, 11" or greater)
Battery Charger
Current Design:
- Arm 7 used as the onboard controller, drives the motors via the ESCs using the PWM drivers.
- Use back EMF and IMU data as feedback to stabilize.
- Transmit controls to the onboard controller using the 433mhz transceiver from the offboard controller.
- Offboard controller (ARM M4) connected to PC using RS232.
- PC used to create control inputs.
- Check battery level using a voltage divider and an ADC input.
Where I currently am:
- I have setup the ARM 7 board, have created libraries for all the basic peripherals (UART, PWM, SPI, I2C, TIMER, GPIO)
- Currently working on setting up the ethernet and USB drivers.
- Waiting on the motors and ESCs to arrive
- Coming up with design templates for the frame
- Working on a sensor fusion library for the IMU
Future Plans:
- Use a kalman filter for IMU data instead of sensor fuision
- Add GPS
- Android interface
- Slight Autonomy
I am having problems finding an appropriately sized propeller. The few specs for the motor claims that it has an 8mm shaft, but it seems impossible to find an 11"+ CF propeller with an 8mm shaft diameter. A lot of them seem to be 6mm. Is that the popular size? Or am I misunderstanding something?
Anyone have any input or advice?
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