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by PiGraham
Mon May 10, 2021 7:20 am
Forum: Automation, sensing and robotics
Topic: Projection Clock
Replies: 15
Views: 672

Re: Projection Clock

When did those projectors get so cheap? It is a crazy price, isn't it? I guess there isn't that much to it. 320x240 pixel LCDs are super cheap. Super bright LEDs are also cheap. Possibly the main cost is the HDMI in drive board (it also has USB & SD card interfaces) Still I think this must be h...
by PiGraham
Sun May 09, 2021 5:04 pm
Forum: Automation, sensing and robotics
Topic: Projection Clock
Replies: 15
Views: 672

Re: Projection Clock

Just for fun, because that projector was so cheap (was £10.30), I got one. Using this CSS clock https://codepen.io/tempo22/full/pEJxh Projecting onto a door in a shaded room (the projector isn't very bright) https://www.youtube.com/watch?v=n2QkvEu6aPg HDMI input works fine with Pi. Optics is good en...
by PiGraham
Fri May 07, 2021 9:33 pm
Forum: General
Topic: Communication between multiple pico's
Replies: 24
Views: 643

Re: Communication between multiple pico's

I understand that a single master individually poling a number of slaves is most often the easiest approach, but it fails badly when near instantaneous response is required at the master in response to events occurring at the slaves. For an interactive puzzle what would be an appropriate response t...
by PiGraham
Fri May 07, 2021 11:40 am
Forum: General
Topic: Communication between multiple pico's
Replies: 24
Views: 643

Re: Communication between multiple pico's

Key phrase ' multidrop ' Shared data line driven with tri-stable outputs. All devices listen but only one talks at a time. Given the OP's specification it might be that nothing more than digital signalling is needed; open collector outputs pulling the shared line low when a puzzle is completed. The...
by PiGraham
Fri May 07, 2021 9:32 am
Forum: General
Topic: Communication between multiple pico's
Replies: 24
Views: 643

Re: Communication between multiple pico's

If I understand correctly the OP has ruled out I2C and SPI since he does not want a single master bus. I can think of many situations where constant poling of multiple slaves by a master is undesirable. That does seem to be the objection I've also tried I2C, but this way the master always need to a...
by PiGraham
Thu May 06, 2021 6:16 pm
Forum: General
Topic: Communication between multiple pico's
Replies: 24
Views: 643

Re: Communication between multiple pico's

RS485 Key phrase ' multidrop ' Shared data line driven with tri-stable outputs. All devices listen but only one talks at a time. If you are only communicating between Picos you control over short distances you can simply set the Tx pin of listen only devices to INPUT which is tri-state or floating. ...
by PiGraham
Tue May 04, 2021 7:20 pm
Forum: Automation, sensing and robotics
Topic: Projection Clock
Replies: 15
Views: 672

Re: Projection Clock

My problem is when I plug the laser to the 3.3V of GPIO, the laser lacks power ... I don't know what can I do :roll: How will you project a clock with this? Do you intend to use the clock laser and LCD, or strip those out and use the lens? What did you want to do with GPIO? If you want to power the...
by PiGraham
Tue May 04, 2021 2:07 pm
Forum: Beginners
Topic: can’t find the pi on the networ
Replies: 2
Views: 92

Re: can’t find the pi on the networ

If you can get it booting again you can find the IP address from your router web interface DHCP table, or Android App Fing is very good at finding devices on the local network. AngryIP scanner can ping a range of addresses and should find the Pi if it's there. Apple should let you connect using the ...
by PiGraham
Tue May 04, 2021 10:07 am
Forum: Raspberry Pi OS
Topic: How to create a background task ?
Replies: 2
Views: 144

Re: How to create a background task ?

You should provide more info on what you want to achieve. You can make any command line program run as a background task by adding & on the end of the command. Some info on that here https://linuxhandbook.com/run-process-background/ You can also start various tasks from different terminal window...
by PiGraham
Mon May 03, 2021 7:44 pm
Forum: Automation, sensing and robotics
Topic: Projection Clock
Replies: 15
Views: 672

Re: Projection Clock

No no !! I just want a digital clock display with electronic parts using GPIO ! Go on then. make your own projector! You need a lens and some very bright LEDs to start with. How far have you got? Or you could start without the complications of projectors (but you chose to put projector in the title...
by PiGraham
Mon May 03, 2021 6:19 pm
Forum: Automation, sensing and robotics
Topic: Projection Clock
Replies: 15
Views: 672

Re: Projection Clock

Hi ! Thanks for your replies ! It's great projects, I love it ! But I would like a very simple thing with a projector like this You need a projection display. Of course you can get those, but good ones are expensive not realy what you want. You could get something like this https://image.pushauctio...
by PiGraham
Sun May 02, 2021 2:34 pm
Forum: Graphics, sound and multimedia
Topic: sending a single frame from HDMI
Replies: 10
Views: 282

Re: sending a single frame from HDMI

OP want to run HDMI (or any other display interface) at zero frame rate, at least that's how I interpret his posting. Well, it seems the OP wants to provide a single image frame to a DMD then power down the interface for a while. Presumably the intention is that the DMD keeps displaying an image wi...
by PiGraham
Sun May 02, 2021 10:13 am
Forum: Graphics, sound and multimedia
Topic: sending a single frame from HDMI
Replies: 10
Views: 282

Re: sending a single frame from HDMI

sounds like the exact reason DSI has a burst mode when DSI is operating in burst mode, it sends an entire scanline at the full data rate (way faster then the pixel clock), then it entirely stops, and waits for the next hsync The requirement seems to be an entire frame rather then a line. Where that...
by PiGraham
Sun May 02, 2021 10:10 am
Forum: Graphics, sound and multimedia
Topic: sending a single frame from HDMI
Replies: 10
Views: 282

Re: sending a single frame from HDMI

You can't disable the input on the DMD. What I mean by efficiency is the power consumption. TFP401 consumes quite a bit of power and our system is battery operated... I am planning to monitor the vsync signal and put TFP401 in power down mode on the second pulse but I prefer doing this in software....
by PiGraham
Sat May 01, 2021 7:07 pm
Forum: Graphics, sound and multimedia
Topic: sending a single frame from HDMI
Replies: 10
Views: 282

Re: sending a single frame from HDMI

We are trying to display binary patterns on a DMD, specifically DLP2010. The device takes a stack of 24 patterns as a single RGB image and displays each bit layer with an external trigger. The controller has 2 frame buffers, one of them is displayed on the device and the second one is written at th...
by PiGraham
Sat May 01, 2021 9:40 am
Forum: Graphics, sound and multimedia
Topic: sending a single frame from HDMI
Replies: 10
Views: 282

Re: sending a single frame from HDMI

Hi, I am using a raspberry pi zero for my project, where I need to write a single frame of image to the frame buffer of an external display. The frame buffer of the display takes 24 bit parallel data provided by an adafruit TFP401 board, which takes HDMI in, gives parallel data out. Basically I nee...
by PiGraham
Tue Apr 27, 2021 11:47 am
Forum: General
Topic: (Yet Another) Arduino port for RP2040/Pico (Linux, Win, Mac)
Replies: 32
Views: 2374

Re: (Yet Another) Arduino port for RP2040/Pico (Linux, Win, Mac)

Does anyone know details of how it downloads over single USB cable? The same as all the workarounds here, essentially. It includes a USB virtual serial driver that detects a special condition (set to 1200bps, I think) and calls the rom monitor "reboot and enter bootstrap" call. So that's ...
by PiGraham
Thu Apr 22, 2021 3:20 pm
Forum: General
Topic: Pico becomes PC
Replies: 18
Views: 897

Re: Pico becomes PC

craigevil wrote:
Thu Apr 22, 2021 3:03 pm
I am more interested in POCKIT.
https://pockit.ai/
That's very clever.
by PiGraham
Thu Apr 22, 2021 8:59 am
Forum: General
Topic: MicroPython and CircuitPython on the same RB pi pico?
Replies: 7
Views: 253

Re: MicroPython and CircuitPython on the same RB pi pico?

A little research is a good thing. See if there are libraries for al the things you need. The Python language in each is basically the same so there is a good chance your own code will transfer without many changes. But you will probably be using some different libraries. There are differences in in...
by PiGraham
Wed Apr 21, 2021 8:35 pm
Forum: General
Topic: MicroPython and CircuitPython on the same RB pi pico?
Replies: 7
Views: 253

Re: MicroPython and CircuitPython on the same RB pi pico?

Simple answer is no. Both Circuit Python and Micro Python are installed as single UF2 files that take over the PICO. You have to choose between Circuit Python, MicroPython or C/C++ SDK as the operating environment for your Pico. If the display is supported in CircuitPython why not use that? MicroPy...
by PiGraham
Wed Apr 21, 2021 8:06 pm
Forum: General
Topic: MicroPython and CircuitPython on the same RB pi pico?
Replies: 7
Views: 253

Re: MicroPython and CircuitPython on the same RB pi pico?

It would be possible to have MicroPython, CircuitPython and other firmware as a single UF2, all in the same Flash on the Pico, allowing some kind of 'multi-boot system' where one could choose which to run, it is even possible that an in-built CircuitPython feature could be called from MicroPython a...
by PiGraham
Wed Apr 21, 2021 4:14 pm
Forum: General
Topic: MicroPython and CircuitPython on the same RB pi pico?
Replies: 7
Views: 253

Re: MicroPython and CircuitPython on the same RB pi pico?

Simple answer is no. Both Circuit Python and Micro Python are installed as single UF2 files that take over the PICO. You have to choose between Circuit Python, MicroPython or C/C++ SDK as the operating environment for your Pico.

If the display is supported in CircuitPython why not use that?
by PiGraham
Wed Apr 21, 2021 10:08 am
Forum: Python
Topic: Convert Python executable back to python script
Replies: 14
Views: 312

Re: Convert Python executable back to python script

No simple "test.py", but there are example test files in the git repo https://github.com/jgarff/rpi_ws281x/tree/master/python/examples Also the makelists.txt references test Specifically main.c set(TEST_SOURCES main.c } set(TEST_TARGET test) So if you run cmake and make you will build test...
by PiGraham
Mon Apr 19, 2021 7:39 am
Forum: General discussion
Topic: Get Raspberry pi visible in the folder "Network" on windows
Replies: 7
Views: 248

Re: Get Raspberry pi visible in the folder "Network" on windows

Hello, i wanna get my pi visible on the network folder on windows. I wanna get acces to my file system on my pi through my windows pc. Is it possible to press the "Create remote connecting" button, or something like this to acces my pi with a remote connection? Thanks You can use Samba to...

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