Mitchell Starnes

Arduino Motion Detector Using Parallax Passive Infrared Motion Sensor #555-28027

Parallax’s Passive Infrared Motion Sensor, #555-28027, is a small board you can easily add to your Arduino project. I put together a sketch using this device together with a 16×2 LCD for the read out. The code is based on two other sketches I found; one for LCD and the other for processing the input from the sensor.

The circuit is powered by 3.3V on the Arduino.

This code prints an alert along with the hours, minutes, and seconds since initialization on the LCD. It also prints out to the serial port/USB that you can read from your computer if you don’t have an LCD.

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Arduino LCD Thermometer Using Dallas DS1822+

The Dallas DS1822+ is a tiny little IC in a typical transistor package that can be used for temperature readings. I put together a simple little sketch using this device together with a 16×2 LCD for the read out. The code is based on two other sketches I found; one for LCD and the other for reading temperatures with the Dallas 1822+.

It is powered by 5V via USB. I had to use both the 3V and 5V outputs of the Arduino to power the Dallas DS1822+ and the LCD simultaneously. The LCD wouldn’t work when I tried to power it on the same 5V as the IC. Does anyone know how to make them work together? This is one of my first Arduino projects and I’m just thinking the circuits I can combine is limited if they all need separate power supplies.

This code prints the temperature only when it changes. It prints to the serial port that you can read from your computer if hooked up and it prints to the LCD.

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