What is needed for an open Wlan server?

Projects Networking, Protocols, and Devices
1

I want to build an open server for outdoor temperature. What I want is getting temperature easily via a browser to my phone or for any ones phone.
I get the the temperature from a PT100 sensor, so that is clear enough. And making simple webpage with that isn't too hard. But Wlan server HW and are not so clear. Is there a Wlan shield and suitable example, or is ESP32 or similar better.

2

Both will work, pick the one you are most comfortable with. The ESP32 will respond faster and has more memory if you expand.

3

Remember with WiFi you will need a lot of power. Phones also support BLE. When you use BLE you could have the sensor run on a battery for many month.

You could have a look at the Arduino Nano 33 IoT. It supports WiFi and BLE (not at the same time). So, you can try both.

4

Hah, bad karma. I added Karma to Klaus and my unfinished post vanished.
Second try. Nano 33 IoT looks good and the price is good too. I have only a small battery and solar cell, so power is important. Autumns here are also anything but sunny.
Later on I will put this on mains, and then I'll get more reach with Wlan.

Are there good libraries or examples for Nano 33 IoT?

5

LMI1:
Are there good libraries or examples for Nano 33 IoT?

The Arduino libraries for BLE and WiFi are easy to understand and use.

Because the Arduino Nano 33 IoT uses the Microchip/ATMEL SAMD microcontroller that is used by other boards e.g. from Adafruit other libraries for sensors modules work as well e.g. the Bosch BME280 weather sensor, MQTT libraries and many more that I tried so far.

6

If power consumption is an issue, you'll be better off using an ESP32 directly. An Arduino Nano 33 IoT consists of a SAMD microcontroller, an ESP32 microcontroller, an IMU and a crypto unit, all of these together will obviously require more power than an ESP32 module on its own, and you can't simply turn off the components you don't need on a Nano 33, (except by cutting traces, which is pretty permanent).

Using the ESP32 directly also allows more advanced control over the BLE and WiFi hardware. You can find countless BLE and WiFi examples online and included with the ESP32 Arduino Core.

Pieter