RAPPAHANNOCK COMMUNITY COLLEGE STEM CAMP
  • Home
  • 2021 STEM Camp (HS)
    • PreAcademy prep
    • Day 1: Basics, Lights, and Temperature Sensor >
      • Day 1 Supplement: Measure Temperature
      • Day 1 Supplement: IR Temp Sensor
      • Day 1 Supplement: Identifying Resistors
      • Supplement: Controlling Buttons
      • Supplement: Controlling A Servo
    • Day 2: Measuring Pulse >
      • How the body absorbs light
      • Day 2 Supplement: IR Light Proximity Sensor
      • Day 2 Supplement: Motion Sensor
      • Code to start later on plotter
    • Day 3 Supplement: OLED Screen Basics >
      • Display Screen Temperature
      • IR Temp Sensor And Screen
      • Scrolling Screen Graph
    • Day 4: Finishing up/Show >
      • Pictures to OLED
      • BPM Pulse Sensor
      • Multimeter
  • Shared Google Folder
  • The Teachers
  • Archive
    • Pictures from prior years
    • 2021 STEM Camp (MS) >
      • Home (2021)
      • PreAcademy prep
      • Day 1: Basics, Lights, and Temperature Sensor >
        • Day 1 Supplement: Identifying Resistors
        • Day 1 Supplement: Measure Temperature
        • Day 1 Supplement: IR Light Proximity Sensor
      • Day 2: Ultrasound >
        • Day 2 Supplement: IR Temp Sensor
        • Day 2 Supplement: Controlling A Servo
      • Day 3: Measuring Pulse >
        • Day 3 Supplement: Motion Sensor
      • Day 4: OLED Screen Basics >
        • Temperature Screen Display
        • IR Temp Sensor And Screen
      • Day 5 Friday: Finishing up/Show
    • 2020 STEM Camp >
      • Home (2020)
      • The 2020 Teachers
      • PreAcademy prep
      • Day 1 Monday: Basics and Lights >
        • Day 1 Supplement Activity
      • Day 2 Tuesday: Servos >
        • Day 2 (Suppliment Activities)
      • Day 3 Wednesday: Making an ECG/EKG! >
        • Day 3 (Supplement Page)
      • Day 4 Thursday: Controlling Servos with EMG >
        • Day 4 Supplemental Activity
      • Day 5 Friday: Finishing up/Show >
        • Unused lessons/content
    • 2018 Lessons >
      • Day 1: Basic Coding
      • Day 2: Motors
      • Day 3: Build Robot Claw
      • Day 4: Saving Positions
      • Day 5: Presentations
    • 2017 Camp >
      • Day 1 (Monday)
      • Day 2: Multicolor LED and Keypad
      • Day 3: Servo and Keypad
      • Day 4: Multiple Motors/Stepper Motor
      • Day 5: Presentations
    • Pictures archive for lessons (some graphic images)
  • Contact Us!

Getting the Graph to Start at Later Measurements

Does your graph start off this? The first values start at zero, and then it goes to the normal values? It seems to take a few cycles  to get going before it prints off real data values. We want to make it not do that and just start at the real data. To do this, we need to prepopulate the graph with 500 data points so it starts scrolling when we start the data collection. 
Picture

The fix, prepopulate the plotter with 500 values on startup! 

If we take 500 initial average measurements on sensor startup, then those first few zero data points get averaged out and also the plotter starts at data point 501 in the loop so the scrolling and zoom in features are happening right when the loop starts. 

Mr. Dorsey explaining the sensor and code.
Picture

Here are comments explaining what the code does

Picture

After you get it working, don't forget to calibrate it. 


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  • Home
  • 2021 STEM Camp (HS)
    • PreAcademy prep
    • Day 1: Basics, Lights, and Temperature Sensor >
      • Day 1 Supplement: Measure Temperature
      • Day 1 Supplement: IR Temp Sensor
      • Day 1 Supplement: Identifying Resistors
      • Supplement: Controlling Buttons
      • Supplement: Controlling A Servo
    • Day 2: Measuring Pulse >
      • How the body absorbs light
      • Day 2 Supplement: IR Light Proximity Sensor
      • Day 2 Supplement: Motion Sensor
      • Code to start later on plotter
    • Day 3 Supplement: OLED Screen Basics >
      • Display Screen Temperature
      • IR Temp Sensor And Screen
      • Scrolling Screen Graph
    • Day 4: Finishing up/Show >
      • Pictures to OLED
      • BPM Pulse Sensor
      • Multimeter
  • Shared Google Folder
  • The Teachers
  • Archive
    • Pictures from prior years
    • 2021 STEM Camp (MS) >
      • Home (2021)
      • PreAcademy prep
      • Day 1: Basics, Lights, and Temperature Sensor >
        • Day 1 Supplement: Identifying Resistors
        • Day 1 Supplement: Measure Temperature
        • Day 1 Supplement: IR Light Proximity Sensor
      • Day 2: Ultrasound >
        • Day 2 Supplement: IR Temp Sensor
        • Day 2 Supplement: Controlling A Servo
      • Day 3: Measuring Pulse >
        • Day 3 Supplement: Motion Sensor
      • Day 4: OLED Screen Basics >
        • Temperature Screen Display
        • IR Temp Sensor And Screen
      • Day 5 Friday: Finishing up/Show
    • 2020 STEM Camp >
      • Home (2020)
      • The 2020 Teachers
      • PreAcademy prep
      • Day 1 Monday: Basics and Lights >
        • Day 1 Supplement Activity
      • Day 2 Tuesday: Servos >
        • Day 2 (Suppliment Activities)
      • Day 3 Wednesday: Making an ECG/EKG! >
        • Day 3 (Supplement Page)
      • Day 4 Thursday: Controlling Servos with EMG >
        • Day 4 Supplemental Activity
      • Day 5 Friday: Finishing up/Show >
        • Unused lessons/content
    • 2018 Lessons >
      • Day 1: Basic Coding
      • Day 2: Motors
      • Day 3: Build Robot Claw
      • Day 4: Saving Positions
      • Day 5: Presentations
    • 2017 Camp >
      • Day 1 (Monday)
      • Day 2: Multicolor LED and Keypad
      • Day 3: Servo and Keypad
      • Day 4: Multiple Motors/Stepper Motor
      • Day 5: Presentations
    • Pictures archive for lessons (some graphic images)
  • Contact Us!