CD4029 Up and Down Counter Module for Arduino from BuildCircuit on Tindie
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Visitors Counter and Automatic Room Light Using Arduino -
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Electronics Engineering World - #Arduino Based Visitor Counter with Automatic Light Control Often we see visitor counters at stadium, mall, offices, class rooms etc. How they count the people and turn ON
Arduino based Digital Counter with LCD display and Push butt - Hackster.io
Bidirectional Visitor Counter using Arduino » ElectroDuino