Temperature controlled relay using the nRF9160 DK

This implements a temperature controlled relay using the nRF9160 DK:

• temperature is measured via a DHT sensor (AM2302)
• a relay is switched on, if the temperature is below a threshold
• the threshold can be increased/decreased by pressing button 2/1
• it publishes the temperature to the cloud
• read threshold from cloud
• override cloud threshold on button press

LED patterns

• LED1: shows relay switch state. On: relay is switched on, Off: relay is switched off
• LED2: on (very shortly) during sensor read
• LED3: signals cloud connectivity state. On: connected, Off: false
• LED4: not used

Building

Prepare the Docker image with all build dependencies

docker build -t sdk-nrf-tcr .

Build the firmware

docker run --rm -v ${PWD}:/workdir/ncs/tcr sdk-nrf-tcr \
    /bin/bash -c 'cd /workdir/ncs/tcr && west build -p always -b nrf9160dk_nrf9160ns'

Flash the firmware

nrfjprog -f nrf91 --program build/zephyr/merged.hex --sectoranduicrerase -r --log