When Thomas Edison was only 22 years old, he was granted a patent for an electronic voting machine deigned for Congress to use. It was his first patent, and it's a good thing that its reception didn't discourage him from tinkering with other machines.
Edison’s “electrographic vote-recorder” had the names of all the voters listed twice: in a “Yes” column on one side, and a “No” column on the other. When a person flipped a switch to indicate their vote, the machine would transmit the signal through an electric current and mark their name in the corresponding column, while keeping track of the total tally of votes on a dial. After everyone had voted, an attendant would place a sheet of chemically treated paper on top of the columns and press down on it with a metallic roller, imprinting the paper with the results.
The machine never gained any ground. Read about the reception it received in Congress at Mental Floss.