This is the most cheapest and effective SSD counter. And you can use it for three different purposes. Lets start to programme it with SetNfix.
You can use the same programme for
01. Flood level meter
But You have to do only few changes to the progtamme.
Following components are needed.
01.Push button switch
03.Arduino Uno with Atmega 328
04.Seven Segments (4 Digits)
I have used here a comman Anode Seven Segment. Details as follows
KYX - 5461BS SSD was used in this project
01.Flood Level MeterYou can connect to Analog pin 0 the following Circuit
02.Continue counter You can connect to Analog pin 0 the following Circuit
If you want to count number of visitors then you can use the following diagram. Use LDR and light a laser and focus to the face of LDR.