Category: Projects

Here is something you can do with multiple poi sync. All poi are now part of one address system. Easy to send some pixels through inside a loop.

 

First things first, have you tried setting up the breadboard test circuit?

Does the SmartPoiOffline sketch upload correctly, and display on 36 connected LED’s? (if you have a longer strip and don’t want to cut it, that’s fine, the rest will just be blank)

Ok it’s time to try streaming pixels.

First load the SmartPoiBasicStreaming sketch to your microcontroller. Right now this is only being tested on the D1 mini, but should work on any ESP8266 board.

The SmartPoiBasicStreaming_UDP_Send program works on PC or Android, you just need Processing IDE with Android Mode installed if you want to do Android.

First, switch on the D1 Mini with LED strip attached. Wait for the led’s to finish cycling their startup pattern, then you need to use the wifi settings to connect the device (PC, Android*) which is running the processing code to the Smart_Poi_2 access point. The password is for this test is: “bluefire”.

*Note: since Marshmallow version, Android has had a nasty “captive portal” detection which refuses to connect to AP’s unless they are able to access the internet. I understand why they did this (security), but without root the only workaround is to put the device in Airplane mode, then switch on WiFi while still in Airplane mode, and connect from there. The annoying notification should be ignored, as there is an option to “never connect to this network” in there somewhere and it will trip you up.  I should probably do a post about this. Just swipe it away, don’t click!!!

Once connected, start the program. Welcome to the world of streaming poi.

A couple of notes: the test program is not POV, it’s an animation (cylon effect) as this is easier to see on a breadboard. I have a complicated program to send images to the poi which are seen only when they are spun, however it’s easier right now to just start with a simple app for testing.

This program does demonstrate one advantage of streaming as opposed to rendering purely on the poi – that is control. It is trivial to change the colour from the random colours I have chosen to any you could wish. I had another version of this program with three knobs which can change the R, G, B values being sent. You could do a curve instead of straight lines, make the line fatter or thinner, slower, faster, and much more.

Have a go, and let me know what you think. Coming soon: more POV poi shenannigans!

 

 

 

The esp8266 is an amazing chip. On my poi the Master* poi creates a wireless access point which the Slave* poi connects to – and Android app connects as well, in order to transmit images. No router needed, just switch on poi, 2nd poi connect automatically, connect phone and start sending pictures.

*I have designated these names, for descriptive purposes.

There are limits, however. The ESP chips have a limitation of 4 connected devices per access point device. If you want more devices talking to each other you need a Router to handle the traffic.

This is fairly simple using arduino examples but it brings up configuration issues. I wanted my poi to be able to be used in standalone as well as Master-Slave-Android configuration, and now Router-Multiple-Poi-Android as well. A few settings are in order.

The first option, standalone poi without wireless, I configured directly in the loop() of code. If no wifi signal has been received within the last 5 seconds the poi switch to backup images. Great, if my phone’s battery dies the show still goes on.

The second alternative (Router) is a bit harder to organize. First, there is a limitation where the chip has to be told if it’s in Access Point mode or not on boot. Ok so that’s a setting. Then we need to know what the static ip address is (hard coded but configurable via web interface) so that we don’t conflict with other poi. Also, once you are in Router mode, what if there is no router?

Right now, my poi check a web configurable EEProm switch on boot first, for Router mode on/off. If Router mode is on, the poi enter connect mode. If, after a certain amount of time, the router is not found, the poi restart in Access Point (master-slave-android) mode. However, upon rebooting again they revert back to Router check, so one has to manually set back to Access Point only mode if required.

I need a diagram here to really show what’s happening.

The problem came in if the router wasn’t configured correctly, or was simply not available, the poi needed a reliable way to get configured. My poi get configured by web interface (local network, no cloud) so AP mode was needed by default in case things went wrong.

Here is the note from my code:

//to activate in browser: http://192.168.1.78/router?router=1

//to deactivate: router=0

So I just type it in the browser on my connected Android or PC and the poi are set. I will assign this to a button on the app at some point.

Currently the only option for multi-poi is to send the same image to all poi simultaneously (only 3 pairs, that’s all I have). This looks great, but there is much more to do obviously. Just a matter of code

Time to go play a bit with the toys…

It’s really hard to photograph these fast moving, flashing poi.

Here are some of the backup images (36px)

 

Here are some images being streamed wirelessly (36px):

 

In order to try generate some interest I have started a project on the awesome Hackaday website: hackaday smartpoi project link

I will also be discussing elements of the programming and hardware on the new Processing forum: my activity on the new processing forum

and also the Arduino forum: arduino website forum

I am going to be busy!

3D design done with FreeCAD

gif from screen grab video done with Ezgif