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Dozens of generalized circuits that you can modify for your needs are shown, complete with the necessary equations to select the proper component values for your needs. Heavy emphasis is placed on connecting sensors not originally designed for Arduinos to the analog inputs, as well as connecting signals other than 5 volts to digital inputs.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.