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by TheRayTracer
Thu Mar 03, 2016 9:28 pm
Forum: Other projects
Topic: VoxCube – 8x8x8 RGB LED Cube for the Raspberry Pi
Replies: 4
Views: 2766

Re: VoxCube – 8x8x8 RGB LED Cube for the Raspberry Pi

I saw this Kickstarter and it looks amazing. At the moment it's hard to justify the price tag. Would you mind providing a price breakdown of the cube?
by TheRayTracer
Thu Mar 03, 2016 9:24 pm
Forum: Other projects
Topic: Free fall with accelerometer (freescale MMA845x)
Replies: 15
Views: 4004

Re: Free fall with accelerometer (freescale MMA845x)

Great project. Are you using a RPi? I would look into Machine Learning to classify a "Fall" from a lot of training data. This topic has nothing to do with RPi.
by TheRayTracer
Wed Mar 02, 2016 9:50 pm
Forum: Other projects
Topic: Spy tech with Rpi:Tapping line
Replies: 3
Views: 919

Re: Spy tech with Rpi:Tapping line

You don't need to invest in a RPi to accomplish this task. Note that connecting anything to a phone line is illegal in most countries. This post has nothing to do with RPi. Anyway, since you're using an IP phone, is it a physical hard phone such as a CISCO, or a soft phone such as X-Lite using the S...
by TheRayTracer
Wed Mar 02, 2016 12:54 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Sub 1" color display
Replies: 9
Views: 1789

Re: Sub 1" color display

I believe the 0.96" color display you are referring to is the SSD1331 device driver? This is an example with a SD card reader onboard: https://www.adafruit.com/products/684 The only displays I can find are for the Arduino which I am quite sure use SPI (My knowledge on is fledgling) . You most likely...
by TheRayTracer
Thu Feb 04, 2016 11:27 pm
Forum: Automation, sensing and robotics
Topic: Web interface temperature
Replies: 3
Views: 1330

Re: Web interface temperature

I would advise you to start small and build your project over time. Take a few days to learn a little about SQL and how the AVG/MIN/MAX aggregate functions behave. Then you can make the query you want (and not what some other blogger does), for example: Fetch the max temperature over the last 7 days...
by TheRayTracer
Sat Jan 30, 2016 10:00 am
Forum: Graphics, sound and multimedia
Topic: SSD1306 device only works after reseating it
Replies: 0
Views: 304

SSD1306 device only works after reseating it

Hi, I have a strange bug that I am at a loss to explain relating to a SSD1306 OLED chipset. I am using Python and RPi.GPIO and SPIDEV to drive a SSD1306 OLED chipset. Upon powering up my RPi2 with the SSD1306 OLED chipset wired and attached, my Python script fails to render pixels on and off when ex...
by TheRayTracer
Sat Jan 30, 2016 9:39 am
Forum: Graphics, sound and multimedia
Topic: What driver chip does this OLED use?
Replies: 2
Views: 520

Re: What driver chip does this OLED use?

Thanks Joan. I also doubled checked the command opcodes from the listing's screenshots and I assumed it was a SSD1306. It arrived a few days ago, and with a little fiddling I was able to confirm that it was a SSD1306 device.
by TheRayTracer
Thu Jan 21, 2016 12:35 pm
Forum: General discussion
Topic: Advice on accelerometer
Replies: 1
Views: 568

Advice on accelerometer

Hi! I would like to over-engineer a pair of dice by using an OLED and an accelerometer with RPi (and a PiZero when they are available). Ideally the goal shall be to shake a breadboard with an OLED and accelerometer onboard, and the screen shall update with a new dice roll. I have the screen setup, a...
by TheRayTracer
Thu Jan 07, 2016 7:18 pm
Forum: Graphics, sound and multimedia
Topic: What driver chip does this OLED use?
Replies: 2
Views: 520

What driver chip does this OLED use?

Hi, I'm looking to purchase a 128x32 OLED that uses SPI. I really like the one at adafruit: https://www.adafruit.com/product/661, but I cannot justify the price with shipping all the way to Australia. I found this 128x32 OLED on ebay, but I don't think it lists the chipset that drives the OLED (for ...
by TheRayTracer
Thu Dec 31, 2015 3:14 am
Forum: Graphics, sound and multimedia
Topic: SSD1306 and SSD1331 Python device modules
Replies: 2
Views: 2053

SSD1306 and SSD1331 Python device modules

Hi! I've created a few stand alone Python modules to help drive the SSD1306 and SSD1331 chipsets using the SPI. The primary reason was just to tinker, but I thought others could benefit from these too (I've already had a few requests on this forum and others). I also feel that these single file modu...
by TheRayTracer
Wed Dec 30, 2015 1:16 am
Forum: Graphics, sound and multimedia
Topic: SSD1331 slow full screen rendering
Replies: 8
Views: 4912

Re: SSD1331 slow full screen rendering

viggi1000 wrote:Hi, Is it possible to share the code for the SSD1331 module?
I've uploaded a few of the Python source files for the SSD1331 chipset in my gist repository:

https://gist.github.com/TheRayTracer/dd ... ecb9b8b47f

It contains the module and a few sample applications. Have fun.
by TheRayTracer
Wed Dec 02, 2015 9:22 am
Forum: General discussion
Topic: Solderless connector pins for Pi Zero GPIO
Replies: 18
Views: 17479

Re: Solderless connector pins for Pi Zero GPIO

Your post reminds me of this from the '90's when you mentioned springs: http://www.chemistrysetsandmore.com/images/EP-130%20130%20in%201%20Electronic%20Playground%20.jpg Is that what you were referring to? Or something a little more modern such as: http://www.alibaba.com/product-detail/electrical-sp...
by TheRayTracer
Tue Dec 01, 2015 11:44 pm
Forum: HATs and other add-ons
Topic: Raspberry pi Zero display
Replies: 2
Views: 5004

Re: Raspberry pi Zero display

Any of the existing RPi displays shall function with PiZero. Such as http://www.adafruit.com/products/2097 (GPIO powered and no buttons).
by TheRayTracer
Mon Nov 30, 2015 10:50 am
Forum: General discussion
Topic: Official WiFi dongle vs other Miniature WiFi
Replies: 2
Views: 840

Re: Official WiFi dongle vs other Miniature WiFi

Thanks. I've added the config, and will monitor this for a few days.
by TheRayTracer
Sun Nov 29, 2015 11:58 pm
Forum: General discussion
Topic: Official WiFi dongle vs other Miniature WiFi
Replies: 2
Views: 840

Official WiFi dongle vs other Miniature WiFi

Hi there! A while ago I purchased an unofficial WiFi dongle for use with my RPi2. The WiFi dongle was this one over at adafruit: http://www.adafruit.com/products/814 In general the WiFi dongle works great (connecting over SSH, not streaming media), but occasionally the WiFi dongle "drops out". The W...
by TheRayTracer
Tue Nov 24, 2015 9:50 pm
Forum: Graphics, sound and multimedia
Topic: SSD1331 slow full screen rendering
Replies: 8
Views: 4912

Re: SSD1331 slow full screen rendering

If you are refreshing the whole screen, as you noticed, setting row=0, col=0 and blasting out all the pixels in one SPI transaction is the fastest way to update the screen. . Yep, this is exactly what I did. :) FYI, I took a peek at the data sheet, according to which the max safe SPI clock rate is ...
by TheRayTracer
Tue Nov 24, 2015 1:12 pm
Forum: Graphics, sound and multimedia
Topic: SSD1331 slow full screen rendering
Replies: 8
Views: 4912

Re: SSD1331 slow full screen rendering

Thank you for the reply. As you've most likely guessed, the SSD1331 has the following datasheet: http://www.adafruit.com/datasheets/SSD1331_1.2.pdf increase the SPI clock rate! I'm going to sound like a noob here, but I think my SPI clock rate is quite high and I'm not sure where that info is on the...
by TheRayTracer
Tue Nov 24, 2015 1:35 am
Forum: Graphics, sound and multimedia
Topic: SSD1331 slow full screen rendering
Replies: 8
Views: 4912

SSD1331 slow full screen rendering

Hi, I’ve got a SSD1331 OLED 96 x 64 attached to my Pi’s GPIO that is driven using Python and the RPi.GPIO module and using the SPI. I’ve rolled my own drawing framework and its working great – pixels, lines, shapes (some hardware accelerated), and an ASCII font set. A routine in the framework writes...
by TheRayTracer
Mon Nov 23, 2015 10:17 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO expansion boards?
Replies: 6
Views: 15180

Re: GPIO expansion boards?

How about the following GPIO expansion board: http://de.aliexpress.com/item/Original-Raspberry-Pi-B-GPIO-Multiplexing-Expansion-Board-Multiplex-Extend-Module-IO-Multiplex-Plate-Free-Shipping/32240229454.html And the following looks to be the same board but different constructor as in your initial po...
by TheRayTracer
Tue Nov 17, 2015 4:58 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 40 Pin GPIO Socket Connector to Pins
Replies: 12
Views: 3906

Re: 40 Pin GPIO Socket Connector to Pins

Thanks the reply with the links.

I've never terminated my own cables before, and I am unsure just how hard or easy it is to do. I'll search youtube for a few "how to" style videos. My preference is something pre-made and professional.
by TheRayTracer
Tue Nov 17, 2015 3:45 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 40 Pin GPIO Socket Connector to Pins
Replies: 12
Views: 3906

40 Pin GPIO Socket Connector to Pins

Hi, I've purchased a few items from the ModMyPi online store in the UK, and they were perfect for my requirements. However, they were on the expensive side and posting to Australia is also expensive. To compare prices, I was wondering if anyone has seen the following item for sale on ebay or another...
by TheRayTracer
Thu Nov 05, 2015 9:42 am
Forum: General programming discussion
Topic: command in command never exits
Replies: 9
Views: 1179

Re: command in command never exits

Wild guess, but is it because you are launching the alarm clock in a background process? /myfolder/folder2/alarmclock/alarmclock.pl & Further to this, when you are passing in the restart parameter you are calling the script recursively. I would strongly recommend that you keep it simple and use some...
by TheRayTracer
Sun Nov 01, 2015 9:57 pm
Forum: General programming discussion
Topic: Tutorials for Beginners
Replies: 1
Views: 580

Re: Tutorials for Beginners

Great tutorials. I would recommend the following minor improvements: 1. Specify the GPIO pins numbers in addition to the labels on the T-cobbler as not everyone has (or needs) a T-cobbler. 2. Include some Ohm calculations. This would be handy for people with different LEDs. For example, and using yo...
by TheRayTracer
Sat Oct 31, 2015 11:18 pm
Forum: General programming discussion
Topic: High level device drivers
Replies: 1
Views: 525

High level device drivers

Hi, I've been having a lot of fun tinkering with a few I2C devices lately - namely temperature sensors, and real-time clocks. At the moment, I interacting with the devices through Bash shell scripting, and the i2c-tools utilities. I've created a few utilities that allow users to interact with these ...
by TheRayTracer
Sun Oct 25, 2015 10:35 am
Forum: Automation, sensing and robotics
Topic: Querying and controlling a LM75 Digital Temperature Sensor
Replies: 1
Views: 1880

Querying and controlling a LM75 Digital Temperature Sensor

This was a simple weekend project to query and control a LM75 Digital Temperature Sensor. While there are a few one-liner Google search results showing how to query a LM75 device, they were extremely limited and lacked showcasing the majority of the LM75 device's features. I have uploaded a Bash scr...

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