Krita is a complete creative sketching and painting application with advanced, commercial quality features. For simplicity, we assume we are getting only one cell change per message.It is made by artists that want to see affordable art tools for everyone. When we get those messages (“reported”), we pull out the cell and color and set the corresponding cell color using the node-svg API. Therefore, plan B was to subscribe to the update topic directly. We really should subscribe to the $aws/./update/delta MQTT topic, but that wasn’t working in our experiment. To update the UI, we go over to the left side of the diagram in the middle. The device is responsible for sending a “reported” update. Notice we do not set the chip color when the user clicks, we simply send our (Arduino) device the “desired” chip and color. the message to the MQTT broker has the form for device shadows, namely. I made two functions here rather than one because during testing, before sending the cell id and color to the MQTT broker, I looped back to the “set cell color” function for testing. When a UI viewer clicks on a tile, the next function downstream of SVG graphics converts the click info into a payload we send to the MQTT broker along the device shadow $aws/./update topic. I installed this extension: node-red-contrib-ui-svg and assigned id’s to each rectangle, along with click events. I manually created an 8×8 matrix of black rectangles, but there are many online SVG editors such as boxy-svg if you want to make more complex shapes. The code for handling the clicks on the UI LED’s is in the SVG graphics node. The middle nodes are the most interesting. The nodes at the bottom (background purple) are just for debugging, we were checking that the device shadow $aws/./update/delta topic was being sent out properly–TL DR it was–but the ESP8266 code was not receiving it, weird. The function takes the color and sets a context variable in Node-Red so we can get the color value when we assign an LED. The set of nodes in the top right corner show the color picker, for users to select which color to set the LED to. On either connect or disconnect events, we pass the eventType to the text box show the device status (CONNECTED or DISCONNECTED). The top left nodes handle the lifecycle events (connect and disconnect).
I already documented my basic setup with the ESP8266 and LED matrix here, and my setup between the ESP8266 and AWS IoT Core here.Ī visual of my Remote LED mapping flow Tour of Flow ArduinoJSON: awesome public secret of so many projects!.node-red-contrib-ui-svg: super-awesome library for making your SVG’s into Node-Red UI.Breadboard Starter Learning Kit: DZS Elec 5 in 1 Breadboard Starter Learning Kit – this included an external power supply for the board.LED Matrix: ACEIRMC 2pcs 8×8 RGB LED Flexible WS2812B 5050 Matrix Dream Color.ESP8266: HiLetgo 3pcs ESP8266 NodeMCU CP2102 ESP-12E Development Board.The Device Status is hooked up to lifecycle events on the Thing. Color change only works when the device is CONNECTED. LED changes are propagated across all users via pub/sub and device shadow. Users can set pixels by clicking once on the cell chip or turning it off by clicking again. My goal was to reproduce David Castillo’s demo for our upcoming IoT Foundations class.Īuthors’ Self-Portrait at 8×8 (you can tell it’s David and not Jonathan because there is hair, sorry about the red eyes though :-)): Two browsers accessing the UI with the physical device in the center bottom. This post documents the trip and gives the full code so you can try it at home (or wherever you happen to be). My adventures in learning IoT continued the past couple of days in which I hooked up a WS2812B LED matrix to my ESP8266 and controlled it through AWS IoT Core and Node-Red.
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