To best make use of our manpower, we decided to split up into smaller groups and let each group work on a part of the code. One group was in charge of the NodeRed (signup/login of the locker using username and password), another group was in charge of the weather function and the OLED-screen, and the final group was in charge of the RFID code.

When the weather/OLED code and the RFID-code was finished, we decided to merge these codes, and clean up.

The functions to be used were split up into different tabs:

• Main script: including initiations, setup void and loop void
• WIFI: These functions connect the MCU to a wifi
• OLED: A switch function for the OLED-screen, so that it will display specific messages depending on which integer the ”state” variable is set to
             (state=1 -> run case 1, state=2 -> run case 2, …)
• MQTT: a callback function which is run if there is an incoming message from the MQTT-server
• RFID_RC522: This code is able to read the rfid-code of new cards, save this info, and check if it is the same card used to unlock the locker. There is also a ”master key” that can unlock all lockers (for the janitor). This is the blue chip in our Arduino-kit.
• WEATHER: This function gets weather forecast data for Copenhagen from http://api.openweathermap.org using an API-key. The data we are interested in (temperature, weather description and time/date) are saved under variables, and can later be displayed on the OLED-screen using the oled-function. Each weather forecast (after 3, 6 or 9 hours) has its own state in the oled function. Collecting fresh weather data (i.e. calling the weather function) happens every 5 minutes.

All delays in the code were replaced with the use of millis(), to make sure the MCU can receive messages from the RFID or MQTT.
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Next time, we want to replace the NodeRed signal that changes the weather forecast that the oled displays to a arduino built in timer that changes the oled. Also, the NodeRed still needs to be incorporated into this code