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RPi ADC hat, built to work with the AuroraWatchNet remote sensor PCBs. The ADC isn't fitted here because the sensor boards already contain them (see www.flickr.com/photos/stevemarple/8517329264/in/album-721...). The logic-level translator for the I2C interface is needed, as well as the 5V to 9V DC-DC converter to power for remote sensor boards.
For source files see github.com/stevemarple/RPi_ADC_hat
Bored moment, picture was created using Zerena Stacker (demo version) using 30 images.
Nikon D90, Tamron 90mm f2.8. Light from a desktop halogen lamp.
PP with GIMP.