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Given that both hardware, will and time was at hand, there was no reason not to go through with finishing up the Solartron conversion project and finally writing firmware to have it work as an actual clock.

Here’s some short notes for using an Arduino as programmer for SPI-based AVRs. Basically, the programmer example is uploaded to the Arduino and then using avrdude to upload a .hex file of your choice. My use was triggered by not having the DFU bootloader intact for an ATmega32u4-based project and having lost access to the regular ISP programmer.

The scientific instrument ripped apart to become a clock, the story of a long-neglected project seemingly making a comeback. Back in 2012 I came across this old voltmeter, with a strange display that I had better ideas for.