GuruBlog

For my Raspberry PI based car-radio that lives in the housing of a blaupunkt radio from the sixties I needed to interface a variable resistor from my pi. Unfortunately the rapsberry pi has no ADC for the GPIO pins so I added a small ATTiny running the arduino-tiny firmware to read the analog values. The ATTiny is programmed as a I2C slave and is accessed in the same way as the radio part of the project.

you can find a tutorial on how to install and run the arduino-tiny firmware here

and you can find the I2C slave library for the attiny chips here

this is my day 18 project for 30daysofcreativity

Today I made a bunch of faces from arbitrary shapes as my day 17 project for 30daysofcreativity

Today I created a 3D printed mount for a clothes rail of an ikea wardrobe.

One of the original mounts broke and unfortunately ikea has no replacement parts anymore because the clothes rails have a different format in the newer edition of this wardrobe. So I designed and printed my own replacement part as my day 16 project for 30daysofcreativity

you can download the openscad file here or the stl file here

For my Day 15 project of 30DaysOfCreativity I created a new background image for my computer using blender.

The solidified lava material was created using textures in a node based cycles material. you can download the blend file here or you can download a highres version here

Today I worked out the component placement and continued to work on the housing.

I plan to create spacers and mounting parts for the pi, the amplifier and the radio on my 3D printer this weekend

Today I started working on the radio part of the raspberry pi radio. I hooked up an AR1010 based breakout board from sparkfun to the i2c ports of the raspberry pi and wrote a short python program to initialize the chip and tune it to a radio station.

It took me a while to figure out how to access the chip and after searching through tons of tutorials example-code and a really really really extremely bad datasheet I finally managed to get my code running.

The main reason why it didn´t work in the beginning was that I didn´t recognize that the smbus library sends long values in LSB,MSB order while the AR1010 wants them in MSB,LSB order :-/. Who would have thought that the littleendian/bigendian thing still exists in 2013

For my day 12 project of 30daysofcreativity.com I have created a blender animation using an swarm particle system that crawls on a suzanne head

you can download the blend file here

Today I managed to get the wlan part of the raspberry pi based car radio for my friends typ 3 wilson working. I used a R8187U based wlan stick from belkin (Belkin N150 WLAN USB-Adapter) and configured an ad-hoc network. I initially intended to create a wlan access point like described here, but I hostapd didn´t want to cooperate :-/

Today I soldered the amplifier module I plan to use in the raspberry pi car radio for my friends typ 3 wilson.

It´s a 2x40 Watt module that can be used with 12 Volts.

This is my Day 10 project for 30daysofcreativity

Today I´ve set up the airplay part of the raspberry pi car radio for my friends typ 3 wilson I have used this tutorial. I also planned to configure the accesspoint part but unfortunately my rtl8187 based wlan usb stick doesn´t support the master mode, so I will have to get a new wlan card tomorrow.

This is my Day 9 project for 30daysofcreativity

Click here to read part 1 of this project