HobbyKing AIO – GPS and Bluetooth

I started by connecting the HobbyKing AIO board to the GPS that I bought from HobbyKing for $35 and to the HC-05 Bluetooth module. This allows me to configure the AIO via BT.

IMG_8400

The connections are as follows:

GPS to AIO board

The UBlox Neo-7M GPS comes with a cable that has 2 mini-molex connectors, one with 4 pins and one with 5 pins.

gps connector

Some changes must be made to these connections in order to fit them to the AIO board. Moving the cables between pins is simple – lift the flap that holds the cable inside the connector and pull the cable out. See the photo below.

IMG_8401

The changes to cabling are as follows:

4-pin connector

The 4 pin connector is connected to the i2C connector on the AIO.

It should have the following cable connected to it, from top (leftmost) to bottom:

  1. SCL – moved from pin 2
  2. SDA – moved from pin 3
  3. VCC – moved from the 5-pin connector
  4. GND – moved from the 5-pin connector

5-pin connector

The TX and RX cables from the 5-pin connector must be connected to RX2 and TX2 on the AIO board respectively. So I replaced the 5-pin connector with a 6-pin connector that I had from the AIO package and connected the TX and RX cables at the right slots.

AIO board to HC-05 BT module

The BT module connects to the FTDI port on the AIO as follows:

  1. AIO GND  —> HC-05 GND
  2. AIO VCC   —> HC-05 5V
  3. AIO – RX   —> HC-05 TX
  4. AIO TX is connected to HC-05 RC via a voltage divider in order to protect the HC-05. The HC-05 uses 3.3V while the output of the AIO board may be 5V. The following photo of a crumpled piece of paper shows the two resistors that form the voltage divider.

IMG_8402

AIO external power

The AIO receives 5V power from an external source on the GND and VCC pins.

 

 

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