Pulse Rate Monitor

As an additional tool for my first project, I found a pulse rate monitor kit. Even though I have never done something like that before, I wanted to know whether I would be able to make it working.

The pulse rate monitor is working with an infra-red radiation that detects the pulse. The output will hopefully be visible in form of an LED as well as a tone.

Overview:

After having identified all the different components, they need to be put into the proper place, so I can start soldering.

In the end, the external battery needs to be added and the LEDs need to be fixed. Here, special attention has to be taken with the LEDs polarity.

Though I put everything together as it ought to, soldered carefully and recognized the appropriate polarities, it did not work. I am aware of the reason, but I heard that these kits are not the most reliable ones. Well, the pumpkin will do without. It is just a shame, since this additional device would have enriched the project as a whole.