Week 6. Group / Electronics Design

This is group assignment page of Electronics Design (Kitakagaya students) :
- Sosuke Kanegae
- Shin Masuoka
- Hiroe Takeda

Group assignment

• use the test equipment in your lab to observe the operation of a microcontroller circuit board

-The microcontoroller we used

• M5STACK ATOM Matrix
• micro:bit
• Seeed Studio XIAO RP2040

-The test equipment we used

• Oscilloscope DS1054Z of RIGOL.

  • The Spec of DS1054Z
    • frequency band : 50MHz
    • Number of analog channels: 4
    • Real-time sample rate : 1GSa/s
    • Maximum memory length :24 Mpts
    • Waveform acquisition rate : 30,000 wfms/s

-About Oscilloscope

• An oscilloscope is an electronic test instrument that displays the value of an electric signal over time.
• The display of the oscilloscope shows the amplitude (usually voltage) of a signal on the Y­axis, and time along the X­axis.
• Oscilloscopes are commonly used to:
  • measure shape of a waveform (a graph of voltage over time)
  • measure amplitude and frequency of a signal
  • and detect glitches and noise in a signal

Prepare - Probe Calibration

• Connect probe to the main unit of DS1054.
• Probe has an orientation, so be careful NOT to connect in the reverse direction.
• How to connect
• About Probe switch, we choose “x10”.

• Then Turn on the Power, and Push “Auto” bottom.

• If the waveform is not flat, turn the probe screw and adjust until the waveform is flat.
  

• Calibration is complete when waveform is straightened.

TEST1, using micro:bit

We programmed with Microsoft MakeCode, 1 output, and upload to micro:bit, then we observed the waveform with DS1054Z. And I could confirm the waveform the same as programming. The Process is below.

• Programming

• Programming by “Write a digital (0 or 1) signal to a pin0” with Microsoft MakeCode. Then download it, then upload it to micro:bit.

  • About the code block, refer to Digital Write Pin
  • About the details of Process of the programming, refer to Week04 Group assigntment
  • In case of Javascript and Python.

• Connect oscilloscope to micro:bit

  • In case of this programming, we connected as follows.

    oscilloscope DS1054Z	micro:bit
    Probe	P0
    GND clip	GND

• Check the waveform of the oscilloscope

  • Push “Auto” bottom, and observe displays the value of an electric signal.
  • We can see the waveform as same as Programming as below video.
  • Video

TEST2, using Seeed Studio XIAO RP2040

We programmed by Arduino IDE, 3 outputs, and upload to Seeed Studio XIAO RP2040, then we observed the waveform with DS1054Z. And I could confirm the waveform the same as programming. The Process is below.

• Programming (with Arduiono IDE)
• The process programming is in Week04 Group assigntment
• Programming code is below.

  #define OUT1 2         //use GPIO2
  #define OUT2 3         //use GPIO3
  #define OUT3 4         //use GPIO4
  
  void setup()
  {
    //PIN output mode
    pinMode(OUT1, OUTPUT);
    pinMode(OUT2, OUTPUT);
    pinMode(OUT3, OUTPUT);
  }
  
  void loop()
  {
    //Flashing in 1-second cycles (500ms turn on、500ms turn off)
    digitalWrite(OUT1, HIGH);
    delay(100);
    digitalWrite(OUT1, LOW);
    delay(100);  
  
    digitalWrite(OUT2, HIGH);
    delay(100);
    digitalWrite(OUT2, LOW);
    delay(100);
  
    digitalWrite(OUT3, HIGH);
    delay(100);
    digitalWrite(OUT3, LOW);
    delay(100);
  }
  

Then Connect oscilloscope to Seeed Studio XIAO RP2040 with Jamper wire and pin.

oscilloscope DS1054Z	Seeed Studio > XIAO RP2040
Probe	GPIO 2
Probe	GPIO 3
Probe	GPIO 4
GND clip	GNG

About the GPIO number, and find it in Ardian Torres site, and it helpes us a lot.

We observed the waveform, we can see the waveform as same as Programming, showing below video.

Useful Link

• RIGOL
  • Basics of Oscilloscopes
  • Making your first measurement

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Last update: March 19, 2023