For this week assignment I decided to try an IR movement sensor. I will need some of these for my final project.
The smallest I found that answers my needs is this one from Polulu
The sensor is based on the TSSP77038 reciever module.
Here is the scheme for the tiny board.
I tested it with an Arduino Uno just to be confident but I start having a sensivity problem. Basically the sensor keep sensing anything around. It is really too sensitive.
I tested it with an Arduino Uno just to be confident but I start having a sensivity problem. Basically the sensor keep sensing anything around. It is really too sensitive. So I searched the web and found a forum that helped me to find out how to solve it. Basically I'll need to build a really well made shield around IR emitter and reciever. I need to 3D print it
In the meanwhile I started producing my satshakit, Following the design of Daniele from last year class here at Opendot.
I 3D printed the shield for IR sensor and attached to the board
This is a side view of the piece. Black tape closes the back part of the shield
I tried again the sensor with an arduino uno hoping to have no more problem of sensistivity...but the sensor still keep recognize something. I tried to lower the voltage with several resistors and even with a pot without luck.
In the end to avoid any further delay I decided to use a simple capacitive sensor as input for my final project. I used the satshakit I produced and arduino IDE to program it.
Here is the value delta shown in the IDE serial monitor.
A steel button is perfect as touch sensor
The final result.