In the microcontroller era today, Arduino is ... Here an LDR (Light Dependent Resistor) is used to measure the light level. The alarm system is triggered when a “Logic High (H)” level signal is ...

The on-board 1-MΩ pull-up resistor calls for a very high-resistance LDR, but the most common ... The code is an Arduino project for the Digispark Attiny85 to turn on a light source when the PIR sensor ...

Get close enough to this raven and you’ll set off the PIR sensor, which triggers lighting ... This bird’s brain is an Arduino Nano, which is protected from the 12V supply with a boost converter.

When something passes in front of a PIR sensor it detects the change in background temperature and then triggers an output voltage. This voltage can be read by an Arduino digital input and then ...

The device collected dust in his room for some a while until he recently unearthed it, and noticed that a perfectly good PIR ... sensor’s signals, allowing him to easily wire it up to an Arduino.

You’ll see PIRPin defined as “2” and OutPin defined as “3”—these correspond to where you plugged the PIR sensor and power relay into the Arduino. With your fan unplugged, turn it on ...