Oled Numpad and Display

This project is never going to see the light of day so I guess it doesn't hurt to show it here now. I was tasked with creating this code entry system for an escape room. You enter the code, the numbers appear on the screen and with the correct value an electromagnet box unlocks. I used the ESP8266 because its cheap, has easy mounting points, and can be remotely connected to for future expansion. The whole thing was driven from a small DC-DC so it had 12V and 5V at the same time. The keypad is a scanning matrix and the OLED is driven from the I2C, there is just enough IO on the Wemos D1 to meet all the requirements, but there had to be some juggling to use the TX/RX pins etc.

It looks like the only image I have of the screen illuminated is from the prototype system, the oled had the perfect combination of brightness and readability.

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