Need Suggestions for Arduino-Based Group Alert System Using WhatsApp

Projects Networking, Protocols, and Devices
1

Hi everyone,

I’m working on a small project where I want to create a group alert system using Arduino. The idea is to send a notification to a WhatsApp group whenever a specific condition is triggered — like motion detected, a door opening, or even a sensor hitting a certain threshold.

I’ve seen some tutorials online about integrating Arduino with WhatsApp using services like Twilio or other APIs, but I’m still not sure what would be the best (and affordable) way to push messages directly to a WhatsApp group.

Has anyone here tried something similar or have any ideas on how to implement this efficiently? I'm looking for recommendations on both the hardware and the API side.

Looking forward to any suggestions or ideas. Thanks in advance!

2

When you say "best", do you mean "reliable"?
When you say "affordable", do you mean "costs nothing"?

Last time I checked (a year ago) Telegram was the only group chat thing that had a no cost API. You get what you pay for so if something is free, then don't assume it's going to be reliable.

3

While not free like telegram, the Arduino cloud supports Alexa which can do as you want. The other options (off the top of my head) are MQTT and/or Zigbee. I see it also now supports Google Home, but at a small cost. Apple HomeKit is also supported, but that is not free either. You can connect to Home Assistant through MQTT as well.