DIY Arduino Motion Sensor Lighting Control

From the minds at http://arduinotronics.blogspot.com/

We wanted to save energy, and create convenience, by adding motion sensors to our lighting circuits. When I walk into a room, the lights come on automatically, and when I leave, shut off after a short period of time. You can choose how long that time delay is in the code. No more fumbling for a light switch in the dark with my arms full of groceries!

I also wanted a override switch for times I want the light to stay on, or off.

So, I took an Arduino, added a PIR sensor, a SSR, a SPDT switch,  two 10k ohm resistors and whipped up a small sketch to glue it all together. Enjoy!

Original article, and more at http://arduinotronics.blogspot.com/2013/01/motion-sensors-ssrs.html

Multiple motion sensors, and multiple SSR's can be serviced by a single Arduino. A embedded Atmel chip can be built into the project instead of dedicating a complete Arduino board.

Step 1: The PIR Sensor

The first step was connecting a PIR sensor. A PIR detects "motion" by recognizing an increase in Infra Red emission in the focus area, put out by the human body.

For background info on PIR, see http://en.wikipedia.org/wiki/Passive_infrared_sensor

We obtained our PIR Sensor from Amazon.

Connect the 3 pins of the PIR to +5vdc, Arduino Pin 2 (data out), and Ground.

Comments

[angpal59]

(removed by author or community request)

[sspence]

I'd have to see your code.

[angpal59]

never mind, I just did it a different way

[sspence]

want to share?

[angpal59]

How do you do that? I am new to this even thoufg I've been a member I've never shared

[sspence]

Just paste your sketch, or email me at [e-mail]

[angpal59]

I keep getting " a function-definition is not allowed here before '{'token
sketch_feb28b.ino; In function 'void loop()':

[sspence]

Please post code.

[vectorges]

I think the section of Step 5 dealing with the "AC from wall" needs some clarification. AC has load and ground I think you are running load to pin 1 and ground to the lamp, but it isn't clear from the schematic. Otherwise it is great. I love the idea of the override switches.

[sspence]

AC has Hot, Neutral, and Ground. We are breaking the HOT Line and inserting the SSR into the Hot Line (Series). Neutral continues to the appliance unbroken. We are not breaking the ground line (if it exists).

[sspence]

I updated the schematic, labeling the Hot and Neutral lines.