‘Circuit Cobbling’ the Riffle Data Logger

https://www.electronics-lab.com/48276-2/

John Keefe has designed an open source data logger that is able to monitor conductivity, temperature and turbidity of water in lakes and fits inside a plastic bottle. The board is designed to monitor the conductivity (and, possibly, contamination) of water in lakes and streams, with the wonderful feature that it fits through the mouth […]