Send a Message on Discord

Discord server has a system to send messages automatically to a channel.

This system uses webhook, so you just have to send a web request to a URL and a message will be written on the selected channel.

https://en.wikipedia.org/wiki/Webhook

This could be used in many ways, for example:

• Make a badge reader using RFID to send a message when someone is at your fablab.
• Display the temperature of a room each hour.

Update

Since this tutorial was made, I create a library on Arduino with examples !

Search Discord on the library manager and you will find it

/*
  Send Hello World to Discord using WebHook
*/

#include <Discord_WebHook.h>

Discord_Webhook discord; // Create a Discord_Webhook object
// How to get the Webhook URL
// https://support.discord.com/hc/en-us/articles/228383668-Intro-to-Webhooks
String DISCORD_WEBHOOK = "https://discord.com/api/webhooks/id/token";

void setup() {
  Serial.begin(115200);
  discord.begin(DISCORD_WEBHOOK); // Initialize the Discord_Webhook object
  discord.addWiFi("WiFiName","WiFiPassword"); // Add WiFi credentials (you can add multiples WiFi SSID)
  discord.connectWiFi(); // Connect to WiFi
  discord.send("Hello World"); // Send Hello World to Discord
}

void loop() {

}

Create a Webhook

First we need to create a webhook in our server:

https://support.discordapp.com/hc/en-us/articles/228383668-Intro-to-Webhooks

Click on your discord servername → Discord Settings Then click on Webhook → Create WebHook

Copy the Webhook URL

Arduino Code

I used Arduino Create to write my code, but you can also use the classic IDE.

Here is a link to the code: https://create.arduino.cc/editor/madnerd/429197a3-8a40-4d2c-bc16-1a502cb26cd9/preview

Settings

Settings are inside arduino_secrets.h or the Secrettab

• SECRET_SSID: your Wi-Fi network name
• SECRET_PASS: your Wi-Fi password
• SECRET_WEBHOOK: your Webhook URL without https://discordapp.com
• SECRET_TTS: true to enable text to speech or false to disable it

Upload your code on your Arduino MKR 1010, you should see this message:

You can find more information on how to use Discord webhook here: https://discordapp.com/developers/docs/resources/webhook#execute-webhook

Here is also some information for text-to-speech: https://support.discordapp.com/hc/en-us/articles/212517297-Text-to-Speech-101

To send a message on discord, just type:

discord_send("Hello World");

Library

I used two libraries for this code:

• WiFiNINA: Wi-Fi manager
• ArduinoHttpClient: Web request