Project #28 – Sensors – MMA7361 – Mk14

Published February 23, 2024 | By DonLuc

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#DonLucElectronics #DonLuc #Sensors #MMA7361 #Adafruit #SparkFun #Arduino #Project #Fritzing #Programming #Electronics #Microcontrollers #Consultant

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SparkFun Triple Axis Accelerometer Breakout – MMA7361

This is a breakout board for Freescale’s MMA7361L three-axis analog MEMS accelerometer. The sensor requires a very low amount of power and has a g-select input which switches the accelerometer between ±1.5g and ±6g measurement ranges. Other features include a sleep mode, signal conditioning, a 1-pole low pass filter, temperature compensation, self test, and 0g-detect which detects linear freefall. Zero-g offset and sensitivity are factory set and require no external devices.

This breadboard friendly board breaks out every pin of the MMA7361L to a 9-pin, 0.1″ pitch header. The sensor works on power between 2.2 and 3.6VDC (3.3 Volt optimal), and typically consumes just 400µA of current. All three axes have their own analog output.

Two selectable measuring ranges (±1.5g, ±6g)
Breadboard friendly – 0.1″ pitch header
Low current consumption: 400 µA
Sleep mode: 3 µA
Low voltage operation: 2.2 Volt – 3.6 Volt
High sensitivity (800 mV/g at 1.5g)
Fast turn on time (0.5 ms enable response time)
Self test for freefall detect diagnosis
0g-Detect for freefall protection
Signal conditioning with low pass filter
Robust design, high shocks survivability

DL2401Mk04

1 x SparkFun Thing Plus – ESP32 WROOM
1 x DS3231 Precision RTC FeatherWing
1 x SparkFun Triple Axis Accelerometer Breakout – MMA7361
1 x Rocker Switch – SPST
1 x Resistor 10K Ohm
1 x CR1220 3V Lithium Coin Cell Battery
1 x 1 x Lithium Ion Battery – 1000mAh
1 x Terminal Block Breakout FeatherWing
1 x SparkFun Cerberus USB Cable

SparkFun Thing Plus – ESP32 WROOM

LED – LED_BUILTIN
SDA – Digital 23
SCL – Digital 22
SW1 – Digital 21
XAC – Analog A0
YAC – Analog A1
ZAC – Analog A2
VIN – +3.3V
GND – GND

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DL2401Mk04p.ino

/****** Don Luc Electronics © ******
Software Version Information
Project #28 - Sensors - MMA7361 - Mk14
28-14
DL2401Mk04p.ino
1 x SparkFun Thing Plus - ESP32 WROOM
1 x DS3231 Precision RTC FeatherWing
1 x SparkFun Triple Axis Accelerometer Breakout - MMA7361
1 x Rocker Switch - SPST
1 x Resistor 10K Ohm
1 x Lithium Ion Battery - 1000mAh
1 x CR1220 3V Lithium Coin Cell Battery
1 x Terminal Block Breakout FeatherWing
1 x SparkFun Cerberus USB Cable
*/

// Include the Library Code
// Bluetooth LE keyboard
#include <BleKeyboard.h>
// Two Wire Interface (TWI/I2C)
#include <Wire.h>
// Serial Peripheral Interface
#include <SPI.h>
// DS3231 Precision RTC 
#include <RTClib.h>

// Bluetooth LE Keyboard
BleKeyboard bleKeyboard;
String sKeyboard = "";
// Send Size
byte sendSize = 0;

// DS3231 Precision RTC 
RTC_DS3231 rtc;
String dateRTC = "";
String timeRTC = "";

// Accelerometer MMA7361
int XAc = A0;
int YAc = A1;
int ZAc = A2;
// Read
int x = 0;
int y = 0; 
int z = 0;

// The number of the Rocker Switch pin
int iSwitch = 21;
// Variable for reading the button status
int SwitchState = 0;

// Software Version Information
String sver = "28-14";

void loop() {

  // Date and Time RTC
  isRTC ();

  // Accelerometer MMA7361
  isMMA7361();

  // Read the state of the Switch value:
  SwitchState = digitalRead(iSwitch);

  // Check if the button is pressed. If it is, the SwitchState is HIGH:
  if (SwitchState == HIGH) {

    // Bluetooth LE Keyboard
    isBluetooth();

  }

  // Delay 1 Second
  delay(1000);

}

getAccelerometer.ino

// Accelerometer MMA7361
// isMMA7361
void isMMA7361(){

  // Accelerometer Read
  x = analogRead(XAc); 
  y = analogRead(YAc);
  z = analogRead(ZAc);

  sKeyboard = sKeyboard + String(x) + "|" + String(y) + "|" + String(z) + "|*";
  
}

getBleKeyboard.ino

// Ble Keyboard
// Bluetooth
// isBluetooth
void isBluetooth() {

  // ESP32 BLE Keyboard
  if(bleKeyboard.isConnected()) {

    // Send Size Length
    sendSize = sKeyboard.length();

    // Send Size, charAt
    for(byte i = 0; i < sendSize+1; i++){

       // Write
       bleKeyboard.write(sKeyboard.charAt(i));
       delay(50);
    
    }
    bleKeyboard.write(KEY_RETURN);

  }

}

getRTC.ino

// Date & Time
// DS3231 Precision RTC
void isSetupRTC() {

  // DS3231 Precision RTC
  if (! rtc.begin()) {
    //Serial.println("Couldn't find RTC");
    //Serial.flush();
    while (1) delay(10);
  }

  if (rtc.lostPower()) {
    //Serial.println("RTC lost power, let's set the time!");
    // When time needs to be set on a new device, or after a power loss, the
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    //rtc.adjust(DateTime(2023, 8, 10, 11, 0, 0));
  }
  
}
// Date and Time RTC
void isRTC () {

  // Date and Time
  dateRTC = "";
  timeRTC = "";
  DateTime now = rtc.now();
  
  // Date
  dateRTC = now.year(), DEC; 
  dateRTC = dateRTC + "/";
  dateRTC = dateRTC + now.month(), DEC;
  dateRTC = dateRTC + "/";
  dateRTC = dateRTC + now.day(), DEC;

  // Time
  timeRTC = now.hour(), DEC;
  timeRTC = timeRTC + ":";
  timeRTC = timeRTC + now.minute(), DEC;
  timeRTC = timeRTC + ":";
  timeRTC = timeRTC + now.second(), DEC;

  // bleKeyboard
  sKeyboard = "SEN|" + sver + "|" + String(dateRTC) 
  + "|" + String(timeRTC) + "|";

}

setup.ino

// Setup
void setup()
{
  
  // Give display time to power on
  delay(100);

  // Bluetooth LE keyboard
  bleKeyboard.begin();
  
  // Wire - Inialize I2C Hardware
  Wire.begin();

  // Give display time to power on
  delay(100);

  // Date & Time RTC
  // DS3231 Precision RTC 
  isSetupRTC();

  // Give display time to power on
  delay(100);
  
  // Initialize the Switch pin as an input
  pinMode(iSwitch, INPUT);

  // Initialize digital pin LED_BUILTIN as an output
  pinMode(LED_BUILTIN, OUTPUT);
  // Turn the LED on HIGH
  digitalWrite(LED_BUILTIN, HIGH);

  // Delay 5 Second
  delay( 5000 );

}

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Posted in #28 - Sensors, Adafruit, Arduino, Consultant, Digital Electronics, ESP32, Fritzing, Instructor, Microcontrollers, Program, Program Arduino, Program ESP32, Projects, SparkFun | Tagged Accelerometer, Adafruit, Arduino, Battery, Bluetooth, Components, Consultant, ESP32, Fritzing, Microcontrollers, MMA7361, Programming, Programming ESP32, Project, Sensors, SparkFun, Technology, Video Blog, Vlog | Leave a comment