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by thomen
Mon Oct 09, 2017 8:20 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Get Pi to turn on an arduino?
Replies: 3
Views: 819

Re: Get Pi to turn on an arduino?

That makes sense... How would I hook in to the on shutdown event so I can turn the relay off/on?
Thanks!!
by thomen
Mon Oct 09, 2017 5:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Get Pi to turn on an arduino?
Replies: 3
Views: 819

Get Pi to turn on an arduino?

Hi I'm building up a retropie barcade and I was hoping to implement a power button like so on the pi: https://www.youtube.com/watch?v=4nTuzIY0i3k I was hoping to then get the pi to turn an arduino on or off i.e. Pi is on, arduino is on.. pi is off arduino is off. The arduino runs some lighting for t...
by thomen
Fri Mar 24, 2017 7:42 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: PI 2 spidev SPI buffer size
Replies: 17
Views: 10060

Re: PI 2 spidev SPI buffer size

I have the same problem.. Can anyone shed any light on this? I'm trying to do some work with screens and seeing that error
by thomen
Fri Mar 24, 2017 7:38 am
Forum: Troubleshooting
Topic: Pi 3 spidev exceeds 4096 bytes
Replies: 2
Views: 454

Re: Pi 3 spidev exceeds 4096 bytes

Hi that doesn't really help sorry.. Under the hood it still uses spidev and so the buffer still is in place
by thomen
Thu Mar 23, 2017 2:39 pm
Forum: Troubleshooting
Topic: Pi 3 spidev exceeds 4096 bytes
Replies: 2
Views: 454

Pi 3 spidev exceeds 4096 bytes

Hi try as I might I can't get the pi3 to run any of the adafruit examples for spi screens. In particular the ssd1351.. It would appear the spidev size is too small. I tried updating it to a bigger size but it still has that value. It seems odd I can't run the adafruit examples for the pi straight of...
by thomen
Tue Mar 14, 2017 8:09 pm
Forum: Beginners
Topic: TXD0 , RXD0
Replies: 3
Views: 1634

Re: TXD0 , RXD0

Thank you all for your replies..

Thanks Scotty for taking the time to write a great newbie explanation!
by thomen
Tue Mar 14, 2017 1:00 pm
Forum: Beginners
Topic: TXD0 , RXD0
Replies: 3
Views: 1634

TXD0 , RXD0

Hi I understand TXD0 and RXD0 can be for serial communication. I was wondering if someone could describe what they are in laymans terms please?
by thomen
Mon Mar 13, 2017 8:37 pm
Forum: Python
Topic: Transfer image via serial to arduino
Replies: 3
Views: 1386

Re: Transfer image via serial to arduino

Thanks Gerhard most appreciated.. I will do some reading
by thomen
Mon Mar 13, 2017 3:52 am
Forum: Python
Topic: Transfer image via serial to arduino
Replies: 3
Views: 1386

Transfer image via serial to arduino

Hi I was wondering if there was something I could read on how to setup a protocol for transferring image data or some json or both etc is larger than 255 bytes between a pi and arduino with headers and checksums?

Thanks :)
by thomen
Sun Mar 12, 2017 11:49 am
Forum: Python
Topic: MQTT -> RPi -> Arduino I/O's
Replies: 15
Views: 3942

Re: MQTT -> RPi -> Arduino I/O's

Hi just wondering how you ended up getting this working? I was hoping to get a pi and teensy talking either via mqtt or ethernet or the like?

Ideally I'd be sending json or delimited text from the pi to the teensy
by thomen
Wed Mar 01, 2017 9:49 pm
Forum: General discussion
Topic: Multitasking the pi / beginner project approach advice
Replies: 0
Views: 264

Multitasking the pi / beginner project approach advice

Hi all I have a project for uni where there'll be the following kinds of requirements A user can send a picture to storage and then that updates a display When a users location changes I'll flash a light play some audio and operate a servo as well as display their picture Operate an rtc and a few se...
by thomen
Wed May 11, 2016 11:48 pm
Forum: Windows 10 for IoT
Topic: RTC Win10IoT
Replies: 0
Views: 418

RTC Win10IoT

Hi I was just wondering if anyone had managed to get an RTC working with Win 10IoT and if there's a way to programatically set the time i.e. on power up if there's a network connection grab the time and set the RTC up?
by thomen
Tue May 10, 2016 11:02 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SPI and chip select pins
Replies: 13
Views: 34415

Re: SPI and chip select pins

Hi just wondering how do you make sure your operation is complete before addressing the next spi cs? Im thinking of using a 74HC138 to drive multiple oleds and wondering the best way to approach updating multiple screens.. would you queue your operations so wait for screen one to complete and then s...
by thomen
Fri Apr 29, 2016 1:12 am
Forum: Windows 10 for IoT
Topic: Queue tasks
Replies: 0
Views: 338

Queue tasks

Hi I was just wondering how people generally queue tasks and actions.. say a request comes in to the device I wanted to add it to a stack and once the requests before it have been completed then complete that task.. im thinking of multiple incoming mqtt events..
by thomen
Sat Apr 09, 2016 10:16 am
Forum: Windows 10 for IoT
Topic: Mqtt with azure or aws
Replies: 3
Views: 1242

Re: Mqtt with azure or aws

I was just wondering if anyone had done anything with mqtt and generally how you've found combining mqtt and writing to a db as a result of pub sub actions.. Also being totally green to all this I was wondering is there a parameter type system to mqtt where you can have multiple devices subscribing ...
by thomen
Sat Apr 09, 2016 10:15 am
Forum: Windows 10 for IoT
Topic: Mqtt with azure or aws
Replies: 3
Views: 1242

Re: Mqtt with azure or aws

I come from a c# background so I thought it might ease the transition.
by thomen
Fri Apr 08, 2016 8:09 am
Forum: Windows 10 for IoT
Topic: Mqtt with azure or aws
Replies: 3
Views: 1242

Mqtt with azure or aws

Hi I was just wondering if anyone has done anything with aws mqtt or azure mqtt and a pi running win 10 IoT/c#


I'm interested to hear how the setup works and what kind of things people are doing with it!
by thomen
Thu Mar 31, 2016 9:31 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: More than 2 SPI slaves
Replies: 19
Views: 9217

Re: More than 2 SPI slaves

Thanks !
I'll give it a try! I wanted to try and run up to 6 oleds with a pi
by thomen
Wed Mar 30, 2016 9:14 pm
Forum: Windows 10 for IoT
Topic: Saving state
Replies: 6
Views: 901

Re: Saving state

It is indeed win10 iot
by thomen
Wed Mar 30, 2016 8:01 am
Forum: Windows 10 for IoT
Topic: Saving state
Replies: 6
Views: 901

Re: Saving state

Thanks so much for the replies guys. I was thinking of writing out a json object to SD card so it would be readable and if something goes wrong ie power out or something on start pulling as much back from a webserver.. Or small document db
by thomen
Wed Mar 30, 2016 7:04 am
Forum: Windows 10 for IoT
Topic: Running app on start up as if pi is a microcontroller
Replies: 0
Views: 361

Running app on start up as if pi is a microcontroller

Hi I was just wondering what people usually do about running their apps as if the pi was a microcontroller?

I was hoping to build a little gadget and on power loss or restart ID ideally like to restart the apl and have some way of restoring state.

I was wondering how this would look under win10iot?
by thomen
Wed Mar 30, 2016 6:59 am
Forum: Windows 10 for IoT
Topic: Saving state
Replies: 6
Views: 901

Saving state

Hi I'm about to start my first microcontroller project using a pi I was wondering how people generally went about saving state in the event of a power loss or configurarion? In this kind of useage do you generally have your compiled code execute on boot up and the restore state from a state file or ...
by thomen
Wed Mar 30, 2016 3:10 am
Forum: Windows 10 for IoT
Topic: Extra SPI Devices using 74hc238n with SpiConnectionSettings
Replies: 0
Views: 375

Extra SPI Devices using 74hc238n with SpiConnectionSettings

Hi All, I'm looking to drive multiple spi displays (up to 6) on a pi3 using win10 IoT. I know the PI only has 2 CS lines so I was hoping to add some extra using a line decoder or the like. I have had a look at the spi connection settings class it appears to just take a CS line identifier: https://ms...
by thomen
Tue Mar 29, 2016 9:36 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: More than 2 SPI slaves
Replies: 19
Views: 9217

Re: More than 2 SPI slaves

Wow micronaughts I can't even begin to understand half of what you've written! (Being totally green and all) time to Google like crazy and read electronics for dummies ha-ha..
by thomen
Tue Mar 29, 2016 9:21 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: More than 2 SPI slaves
Replies: 19
Views: 9217

Re: More than 2 SPI slaves

I was hoping to Daisy chain 6 oled small screens. Do you think that would be possible??

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