WiFi-Temperature-Sender/README.md

A rather simple WiFi temperature sender

Use a micro-controller with WiFi, e.g. a NodeMCU V2 or V3, to send temperature values read from a DS18B20 sensor to a server.

Concept

• The sender is a controller with WiFi that can read values from a temperature sensor.
• Values are sent to a server with hard-coded IP address.
• The controller is configured to go to "deep sleep" after sending values.
• The wakeup feature of the controller shall be used to reactivate it after about 30 min. Note that not all controller boards have such a feature, e.g. the very simple ESP-01 boards to not make the wakeup pin accessible.
• Using deep sleep, it should be possible to run the sender for several days or even weeks with a simple USB power bank.
  Of course, a more sophisticated powering system would be nice.
• The messages are a simple UDP packet containing a JSON structure.
• The server listens at a pre-configured port and can process the JSON structure.
• One server implementation is a Python script that collects the reported values in a CSV file.
• The CSV file can be processed into a simple static web page for display in the local network.

WORK IN PROGRESS