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Building Simple & Low-cost IoT Display.pdf (1030253, 2023-08-29)
architecture.png (40346, 2023-08-29)
extra-images/ (0, 2023-08-29)
extra-images/01-side.jpg (96133, 2023-08-29)
extra-images/02-side-close.jpg (127155, 2023-08-29)
extra-images/03-top.jpg (102088, 2023-08-29)
index.mjs (849, 2023-08-29)
the-device.jpg (108694, 2023-08-29)
wifi-display-nodemcu.ino (6171, 2023-08-29)

# public-wifi-led-display # Wi-Fi LED Display  # Architecture  # Shopping List - Nodemcu (V2 CP2102 version): https://www.aliexpress.com/item/32656401198.html - LED Display: https://www.aliexpress.com/item/32689479860.html - Breadboard: https://www.aliexpress.com/item/1742546890.html - Wires (Male-Male): https://de.aliexpress.com/item/1699267300.html # Step 1 - Configure MQTT Server - Sign up for HiveMQTT and create a free MQTT server (or just use your own). - Create two MQTT users on your new MQTT servers. One for IoT device and one for Backend application. # Step 2 - Build IoT Device - You need to a LED DotMatrix (4 mini panels version) and a Nodemcu. (With a breadboard and couple of jumpers for wiring). - Wire them together and run Hello World on Nodemcu to make sure you did wiring correct and it works. - Update Wi-Fi and MQTT credentials in wifi-display-nodemcu.ino and upload code to the Nodemcu. # Step 3 - Configure Lambda - Go to AWS, create a Lambda with provided index.mjs with Node.js runtime. Make sure you update MQTT connection details accordingly. - Create API Gateway - Create POST Method pointing to the Lambda you created. - Publish your API with name of "prod" # Step 4 - Test - API Gateway will give you URL. You can use it to test. ''' curl --location --request POST 'https://random-string.execute-api.eu-central-1.amazonaws.com/prod' \ --header 'Content-Type: application/json' \ --data-raw '{ "message": "OMG this is so IoT" }' ''' # Step 5 - Done - Celebrate!

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