GPS with multiwii SE v2 and Mega 2560

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max7
Posts: 15
Joined: Mon Apr 07, 2014 12:25 pm

GPS with multiwii SE v2 and Mega 2560

Post by max7 »

I have multiwii SE v2 and Mega 2560 and I wonder if I can connect GPS directly to TTL port with 4 wires?

I seen many GPS on ebay like that
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 1275120696

But some listing mention that welding is required and they provide some electric schemes. They look too complicated.

I guess to use GPS with MultiWii SE v2 I have to get TTL->I2C converter like
http://www.ebay.com/itm/CRIUS-MultiWii- ... 1c3a5b9706

and I can connect GPS TTL with Mega 2560 directly on Serial2 or Serial3

Am I correct?

QuadBow
Posts: 532
Joined: Fri Jan 04, 2013 10:06 am

Re: GPS with multiwii SE v2 and Mega 2560

Post by QuadBow »

max7 wrote: I have multiwii SE v2 and Mega 2560 and I wonder if I can connect GPS directly to TTL port with 4 wires?

The Mulitwii SE v2 is based upon a 328 and not upon a 2560.
https://www.hobbyking.com/hobbyking/store/__27108__MultiWii_SE_V2_0_Flight_Controller_w_FTDI.html

The referred GPS device has a serial-TTL interface. Either you have a 2560 based board with a free serial interface or you have to insert an serial-TTL <-> I2C converter.

max7
Posts: 15
Joined: Mon Apr 07, 2014 12:25 pm

Re: GPS with multiwii SE v2 and Mega 2560

Post by max7 »

I hope you are right. Some listings mention that welding is required and they show schemes like

Image

QuadBow
Posts: 532
Joined: Fri Jan 04, 2013 10:06 am

Re: GPS with multiwii SE v2 and Mega 2560

Post by QuadBow »

The same device is described as follows:

Features:
    ublox/u-blox NEO-6M GPS module with antenna and build-in EEPROM
    This module is compatible with APM2 and APM2.5, and EEPROM can save all your configuration data.
    The battery Model is MS621FE,Need to welding
    Battery not included.
    Interface: RS232 TTL
    Power: 3-5V
    Baudrate default:9600bps

The schematic shown by you has already been done by the producer of http://www.ebay.co.uk/itm/Ublox-NEO-6M-GPS-Module-MWC-IMU-APM2-Aircraft-Flight-Controller-for-Arduino-/171275120696? You don't have to solder anything beside the cable wiring.

At the pictures you can see the interface pins Vcc, Gns, Rx, Tx - so it has a serial TTL interface without any doubt.
There is an internal eeprom already built-in, which is a good feature, since the device will recall the baud rate once it is set via the software u-center.
This eeprom is connected via an internal I2C bus - you don't have to care, but, you can't use this i2c interface for the transfer of gps data to multiwii.

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