AboutDave Nyce Expertise I have been an electronics engineer for 25 years. I can answer questions on analog and digital circuits and my specialty is sensors.
Experience I am the inventor on 23 US patents, and also some foreign ones. Developed sensors for over 25 years. Licensed private pilot (airplane and rotorcraft), have HAM radio license. I'm not an expert in computer networking.
Question My nephew is to make a one-minute timer using household materials. Any suggestions you can give would be greatly appreciated.
Thank you,
Aunt Sue
Answer How about taking a cone-shaped paper cup (the kind from some office water coolers)and cut a small hole in the bottom tip. Suspend it over a cup. Fill it with fine play sand and time how long it takes to run out. Draw a line at the level of sand needed to last one minute.
