Arduino based Reaction Time Tester freetronicsblog So I made this little reaction time test, hope you like it :) : r Make: Electronics Book Experiment 18 Reaction Tester YouTube Arduino Based Reaction Timer Improve Your Reaction Time The DIY Life Set up of the reaction Time test Download Scientific Diagram Human Body Reaction Speed Test Board Full Set Of Parts Kit Digital. The Reaction Tester is based around the 555 timer IC. The kit is designed to test and expand one's sense of timing. The students need to synchronize their reaction time to press the button in time to keep the LED lit or else it goes out. Note: Step by step instructions are not included use the included parts list to identify the components and assemble according to the included circuit diagram. Jumper wire not included (breadboard accepts 21 to 26 AWG wire).