Heartbeat sensor

Hello guys!
Since september I'am working on a project for school that has to be finished in May.
The point of the project is to make a kind of Healthcare gadget to view your heartbeat, the temperature and the amount of steps you took that day.

Everything is working fine except for the heartbeat sensor. We started our project by using the pulsesensor (https://pulsesensor.com/) and found out our results were really unstable and not usable for our project.
Next sensor we tried to use was the Heartrate monitor sensor SEN0203 by DFrobot (Heart_Rate_Sensor_SKU__SEN0203-DFRobot) and still, we have the problem of unstable values. Now I hope you guys could help me, or atleast help me find a solution for this problem since I have no clue at all. I'am using a ESP8266 for the entire project because I'am sending the data to a selfmade database. And I'am using the example-programs to test the sensors so that shouldn't be a problem.

I hope u guys can help me out, thanks in advance!
Robin.

we have the problem of unstable values

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