This articles describes how you can use I2C (TWI) communication, Arduino and temperature ... and 3 x TC74 sensors are the slaves. As you can see in the schematic all three TC74 sensors have their SDA ...

Arduino is a great way ... Digital (pwm) pin D3 drives the piezo-buzzer through a PNP transistor, and the analog pin A0 takes care of the 10K trimpot. Analog pin A4 is for the temperature sensor, ...

When something passes in front of a PIR sensor it detects the change in background temperature and ... the code accordingly. PIR Pin “out” connects to Arduino Digital 2 Here is the Arduino ...