4 sensors into one auiduino

Using Arduino Project Guidance
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Hi, I am only done 5 weeks of auiduino. For my project i am require to create a program for bmi machine consist of Pulse rate, Height (Ultrasonic), Weight (HX711), Temperature. I am able to run individual code However the problem is when combining all the sensors into one code. The reading the auiduino becomce slower and give inaccurate value that will fluctuate which when test individually it is fine. I am using auiduino mega 2560

Thanks.

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This is the Code

PulseSensorAmped_Arduino_1dot4__V1.ino (11.3 KB)