Raspberry Pi A+ with internet

Recently I got my Raspberry Pi 1 A+ and camera from Farnell. As I wanted it to be small (it will be in a case) the cheaper “A” version was a better than “B” for me. The three major differences between A and B version are the following:

  • only 256 Mb Ram
  • only 1 USB (but it is full 2.0)
  • no ethernet connector

A connection to the local subnet will be mandatory, as I want to replicate this bird cam project. So I had to figure out, how to connect my Pi to the router, and also how to keep the price low. This usually means higher hack coefficient. I came up with three solutions, and at the moment two of them all three is working. These are not my work, (I only searched and tested them) they are only put together here for make life easier for those who walk in the same shoe…

Continue reading “Raspberry Pi A+ with internet”

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Arduino controller for Thorlabs LDC200C Series

As my daily job is being a physics PhD student at the Advanced Optical Imaging Group, some good spin-off projects appear which can be released into the open source wilderness. The story starts with a 405nm diode laser, which we installed into a Thorlabs LDC205. The problem with this super controller that there is no RS232 or USB connectivity. Just 3 BNC connectors (1,2,3). As we want to computerize our dSTORM controls, the LDC has to be pimped…Current_Controller_A2-780 Continue reading “Arduino controller for Thorlabs LDC200C Series”

Fix 1-wire after upgrading to kernel 3.18.*

After todays update I have lost my 1-wire devices. As it turns out on January 20 they moved to Kernel 3.18 with device trees enabled. This breaks the i2c, spi, w1 … (list and fix here)

If you are using my setup on 1-wire temperature sensing then here is the fix for you.

  1. Open the /boot/config.txt file as root to gain write access.
  2. Add the following line to the end of the file:
    dtoverlay=w1-gpio,gpiopin=4
  3. Reboot your pi.

This solves your problem with the DS18B20 and other w1 sensors which are connected with three wires to the Pi. (Don’t use parasite mode…)

Have fun, and continue your super work.

Update (2015-03-30): Adafruit page