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!