Go to advanced search

by bobthechemist
Tue Apr 26, 2016 12:04 pm
Forum: Scratch
Topic: Creating a colorimeter with Scratch
Replies: 8
Views: 4303

Re: Creating a colorimeter with Scratch

If you wanted to make a mock-up curvette holder, actually quite a robust one. Then use some Lego to create a square section for the holder and the technics logo bit with the holes in fit led/photodetectors nicely. Another expansion, if the students don't already do it, would be use tricolour LEDs a...
by bobthechemist
Tue Apr 26, 2016 12:00 pm
Forum: Scratch
Topic: Creating a colorimeter with Scratch
Replies: 8
Views: 4303

Re: Creating a colorimeter with Scratch

there are other solutions available like scratchClient, which provide access to a variety of devices including ADC and port expanders. It runs as a separate python program together with current scratch. I have written this for a scratch physical computing course for 7th grade kids at a school here ...
by bobthechemist
Sun Apr 24, 2016 11:53 am
Forum: Scratch
Topic: Creating a colorimeter with Scratch
Replies: 8
Views: 4303

Re: Creating a colorimeter with Scratch

If I can access an MCP3008 and SPI devices like mcp23S17 (I presume I can do the same things with I2C, I just haven't tried), then that covers nearly everything I would use in a teaching setting. (The other being something like an L293D, which I presume can be handled already) My biggest issue right...
by bobthechemist
Sun Apr 24, 2016 1:34 am
Forum: Scratch
Topic: Creating a colorimeter with Scratch
Replies: 8
Views: 4303

Creating a colorimeter with Scratch

I recently incorporated instrument design into my upper level college Chemistry course. I have the students build a colorimeter that can be used to determine the concentration of red food coloring in beverages. Previously, the students used a multimeter as the display, but this year I wanted to give...
by bobthechemist
Thu Mar 03, 2016 6:18 pm
Forum: Troubleshooting
Topic: Wifi 5370 functions but RTL8188CUS does not
Replies: 0
Views: 294

Wifi 5370 functions but RTL8188CUS does not

I am looking for suggestions on how to further debug the following problem. I have an Edimax (RTL8188CUS) adapator and a WiPi (RT5370) adaptor on a RPi2. The WiPi has no problems connecting to my school's WAP (either the unsecured guest or the WPA secured staff). The Edimax rarely (but not never) co...
by bobthechemist
Sat Apr 04, 2015 3:21 pm
Forum: Mathematica
Topic: Can you speed this code up?
Replies: 14
Views: 4683

Re: Can you speed this code up?

Is there a reason why you don't want to use the Mathematica function, PrimeQ?
by bobthechemist
Mon Feb 16, 2015 3:02 am
Forum: Mathematica
Topic: License issue
Replies: 25
Views: 30478

Re: License issue

There were some license issues recognized with earlier (pre Feb 03 2015) versions of Mathematica on the RPi 2. Check $Version to see if you have the latest (should have the Feb 3, 2015 date) and upgrade if necessary. If your still running in to problems, then the latest version isn't the issue.
by bobthechemist
Sun Feb 15, 2015 10:40 pm
Forum: Raspbian
Topic: Pi 2 B Error
Replies: 6
Views: 8320

Re: Pi 2 B Error

I also encountered a problem with RPi 2 and an Edimax wifi adapter; however upon first booting the 15-01-31 raspian image I received a kernel panic error if the edimax was attached. I booted a fresh image with nothing but a USB keyboard attached. and then connected the wifi adapter through a powered...
by bobthechemist
Sat Apr 19, 2014 2:22 pm
Forum: Other projects
Topic: Configuring Jasper
Replies: 3
Views: 2998

Re: Configuring Jasper

The segmentation fault isn't the problem at the moment - I'm assuming that since I can operate Jasper via the command line (--local) that the problem is configuring the audio with a USB headset attached.
by bobthechemist
Sun Apr 13, 2014 5:27 pm
Forum: Other projects
Topic: Configuring Jasper
Replies: 3
Views: 2998

Configuring Jasper

I'm trying to get Jasper set up and burned the jasper image to an SD card (rather than doing the manual installation). At the moment, I can't seem to get Jasper to speak. First, when I ran main.py manually, I received a segmentation fault due to languagemodel.lm not being found in /usr/local/share/p...
by bobthechemist
Fri Mar 14, 2014 8:38 pm
Forum: Mathematica
Topic: Mathematica on a 256MB Model B
Replies: 9
Views: 6249

Re: Mathematica on a 256MB Model B

For what it's worth, I performed some benchmarking of Mathematica on the RPi and posted the results here. I observed considerable improvements with overclocking; however, there were negligible gains on my benchmarking functions with changing the memory split.

Go to advanced search