As a free flying paragliding pilot, finally I have built mine, simple but effective instrument that plays beep-beep during climb and so.
A sample Wilderness Labs Meadow nRF24L01 client for my Windows 10 IoT Core RPi nRF24L01 telemetry field gateways.
Use two 915MHz radios to send/receive current environmental information and display it in real-time up to 350 meters away!
Build an IoT system using the RIOT-OS and MQTT-SN protocol
This is my try to help, I made it to inspire and to share my idea. It works only to detect the symptoms and not the covid19 itself.
A portable distance alarm that will give light and sound warning when people get into your one meter circle.
Alerting the gardener by playing the buzzer when the light intensity on the plants change suddenly.