Practical case: Arduino UNO occupancy counter
A doorway visitor counter using an Arduino UNO R3, two IR break-beam sensors, and a TM1637 4-digit display. The system detects entry vs. exit by timing which…
Arduino, Device Course
Arduino
Practical case: relay timer on Arduino UNO
A standalone workshop countdown relay timer using an Arduino UNO R3, pushbuttons, a 1-channel relay module, and a piezo buzzer. Users can set a duration,…
Practical case: solar battery monitor, Arduino UNO
An Arduino-based solar battery monitor that reads 12 V battery voltage through a voltage divider, measures charge or load current with an ACS712 sensor, and…
Practical case: Arduino UNO incubator thermostat
A basic thermostat controller for a small educational incubator or warm chamber using an Arduino UNO R3, LM35 temperature sensor, 1-channel relay, and 16×2…
Practical case: water leak shutoff, Arduino UNO
A basic water leak shutoff relay controller using an Arduino UNO R3, water leak sensor, 1-channel relay module, and piezo buzzer. When water is detected, the…
Practical case: 12V protector for Arduino UNO
A 12 V low-battery load disconnect controller using an Arduino UNO R3, voltage divider, 1-channel relay module, and 16×2 HD44780 LCD. It continuously samples…