Goat Finder

Worcester Polytechnic Institute AIAA

Battle of the Rockets 2018

Adding the Repository

Clone the repository to a directory

$~ git clone https://github.com/WPI-AIAA/GoatFinder
$~ git checkout dev

From here move into a specific branch

$~ git checkout <branch>

We will be working out of two primary branches within dev

groundStation
rover

SSH for PI

ssh [email protected], password: see GroupMe

Setting up the PI Zero W

Disable BlueTooth

1. Open config.txt sudo nano /boot/config.txt

2. Add the following line to the file dtoverlay=pi3-disable-bt

3. Reboot sudo reboot

Enabling I2C

Taken from Adafruit

1. Install I2C tools sudo apt install -y python-smbus sudo apt install -y i2c-tools

2. Install Kernel Support sudo raspi-config

3. Navigate to Interfacing Options and Enable I2C

4. Reboot sudo reboot

5. Check for attached I2C devices sudo i2cdetect -y 1

Enable SPI

Taken from Adafruit

1. ​Remove the blacklist for the SPI module sudo nano /etc/modprobe.d/rapsi-blacklist.conf

2. Reboot sudo reboot

3. Check the devices are available ls -l /dev/spidev*

Enable UART

1. Install Serial Library sudo apt install python-serial

Install Django

Taken from Django

1. Install Python sudo apt install python3

2. Setup a Database (optional) place holder

3. Install PIP place holder

4. Install Django place holder

Standards

General GPIO

We will be using the BCM GPIO numbering

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)

Using I2C

I2C will be used to interface with the BMP280 and LSM9DS0

import smbus
myDevice = smbus.SMBus(1) # The Pi has two available busses, 0 and 1
myAddress = 0x00 # Device address

def read(byte):
	return(myDevice.read_byte_data(myAddress, byte)) # Read a Byte

def write(byte, value):
	myDevice.write_byte_data(myAddress, byte, value) # Set a Byte to Value

Using UART

UART will be used to interface with the XBEE Radio or GPS

import serial
port = serial.Serial("/dev/ttyAMA0", baudrate=115200, timeout=3.0) # ttyAMA0 corresponds to the UART interface

port.write("Sometext")
port.read(10) # Read 10 Characters

XBEE

XBEE Radio Protocol Options

• Ad Hoc Wireless Network Mode
• Serial Communication Service
• API Mode