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Sensors update week 4

In week 4, we tried to connect and read the heart rate sensor with an arduino. We also started with the manipulation of a ‘ mind flex’  game in order to read brain activity.

We connected the heart rate sensor to the arduino but we only got some noise from the environment and no heart rate. It turned out we were working with an analog signal, insted of digital. We decided to first measure if there whas any kind of signal recorded and transmitted by the sensor. For this we used a device from the electronics lab. We now know the sensor is working and emitting pulses for each heart beat. Unfortunately the sensor and the arduino still do not communicate correctly. For some reason the duration of the pulse stays zero altough the polar watch confirmes there is a signal send by the polar chest strap.

Next we worked on the ‘ mind flex’. The original idea was to tap the signal from the headset to an arduino. Since this meant the arduino had to be attached to the users’  head we decided this wouldn’t be the safest idea. Instead we used the signal used to power the leds on the game console. To do so, we have soldered some extra wires to the console. Fortunately the guys from PMB helped us open the console.

The more LED’s get a signal to light up, the more focussed the user is. These signals are then used as input for the arduino to evaluate the users’  emotion, and thus influence the ferrofluid.
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