Direct wifi connection between phone and uno R4

Projects General Guidance
1

I have done a few simple apps successfully using MIT App inventor between My Samsung phone Uno Rev 3 using Bluetooth.

Is it possible to do something similar using Wifi? Without the cloud or an external router?

If the answer is no, as I suspect, without knowing much about Wifi, is there a tutorial using Bluetooth on the Uno R4?

2

you can run a WiFi access point on the ESP32 and the smartphone can connect too it
have a look at esp32-access-point-ap-web-server - you don't have to run a web server any TCP/IP TCP or UDP client/server protocol can be implemented between the AP and phone
also try a web search for uno r4 ble

3

Are the EPS32 and the Renesas processor on the R4 2 separate entities that can be controlled separately?

4

Don't have an R4 (yet), and still using IDE 18.19, but...
The IDE should have WiFiS3 examples after installing the board files.

The first example seems to be a tutorial for an access point.

  // by default the local IP address will be 192.168.4.1
  // you can override it with the following:
  WiFi.config(IPAddress(192,48,56,2));

Leo..

5

Thanks horace and Wawa. I see the R4 wifi example is what I was looking for. I wasn't sure I could forgo the Router between phone <---> R4 and you helped me get past that. The ESP32 access point example is more polished with buttons so I will hack and slash away at them both. I want to add some ADC readings for remote voltage monitoring as well. But that is for another post if I need help with that. Thank you :slightly_smiling_face: