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The original board was based on the Atmel ATmega328P and cost approximately $10 per unit. In larger machines, up to 72 of these boards could be installed, making the total hardware cost significant.
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I was asked if I could fix a Fibonacci Clock. It is Arduino based and open source so I thought rather than troubleshoot the intermittent issues with the clock I'd just replace it. The obvious choice was a Wemos D1 mini and a RTC shield because I had a few on hand. There was an issue of the battery draining in just minutes, I cut a trace on the board but there is a better solution at Wifi-D1-Mini-Real-time-Clock-and-Logger.
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The Project
Use a GPS module with a microcontroller and an OLED display to control 4 relays based on speed. Use a switch to arm\disarm the relays and a rotary encoder to set the speed at which each relay is activated.