quirky-nimbus-hack

Quirky Nimbus Hacking files

Based on the work of Edu Garcia's

and initial mynimbus.py Python script from Matt

Software Setup

SPI on Pi

The SPI peripheral is not turned on by default. To enable it, do the following.

• Run sudo raspi-config.
• Use the down arrow to select 5 Interfacing Options
• Arrow down to P5 I2C.
• Select yes when it asks you to enable I2C,
• Use the right arrow to select the button.
• Select yes when it asks to reboot.

check if I2C is loaded

Check if your I2C bus is loaded

ls /dev/i2c-*

Expected get something like: /dev/i2c-1

Set Baud rate

Important the Raspberry PI I2C baudrate must set to 400KHz to match imp002 baudrate. use :

sudo nano /boot/config.txt

and add

dtparam=i2c_baudrate=400000

if not present and reboot the RPI

Libraries

First update apt package manager

sudo apt-get update
sudo apt-get upgrade

Install command-line utility programs that can help get an I2C interface

sudo apt-get install -y i2c-tools

Hardware Setup

I directly solder cables on the board imp002 to simplify the connection to the I2C bus of the Raspberry PI.

I2C bus wiring

imp002 I2C PCB pins

• SDA => 14
• SCL => 22
• GND => 1

Raspberry PI I2C pins

• SDA => 3
• SCL => 5
• GND => 1

The electric imp002 and Raspberry PI bas have 3.3Volts level. No level shifter board is required.

Detect the imp002 I2C address

sudo i2cdetect -y 1

You expect get address 0x25, the I2C address of the imp002.

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- 25 -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --