Hi everyone – first time poster but need some help with a project I’m trying to replicate using the following hardware:
-
Artemis Thing Plus
-
Micro OLED
-
Max30101
I’m following the instructions on building a roasted coffee color analyzer found here https://github.com/juztins-lab/roast-meter
After assembling the hardware I followed instructions on adding the board manager to my Arduino preferences, uploaded the necessary libraries, verified/uploaded the sketch to the board but for some reason the OLED just won’t turn on at all. After consulting a couple of people who successfully replicated this project and tried to even run the example Artemis OLED sketches to no avail we guessed maybe the OLED was DOA. SparkFun was great and sent a replacement but still no dice when assembling and running everything. I swapped position of QWIIC cables and that didn’t help at all. Any help from more experienced folks out there would be much appreciated!
Attached are some photos and here’s the code:
#include <SFE_MicroOLED.h>
#include <MAX30105.h>
#include <heartRate.h>
#include <spo2_algorithm.h>
// VERSION 1.0.1-beta
#include <SFE_MicroOLED.h>
#include <Wire.h>
#include “MAX30105.h”
#define PIN_RESET 9
#define DC_JUMPER 1
MAX30105 particleSensor;
MicroOLED oled(PIN_RESET, DC_JUMPER);
long unblockedValue; // Average IR at power up
String multiplyChar(char c, int n) {
String result = “”;
for (int i = 0; i < n; i++) {
result += c;
}
return result;
}
void displayMeasurement(int rLevel) {
oled.clear(PAGE);
oled.setCursor(0, 0);
int calibratedReading = f(rLevel);
int centerPadding = 4 - String(calibratedReading).length();
String paddingText = multiplyChar(’ ', centerPadding);
if (rLevel == 0) {
oled.setFontType(1);
oled.print(“Please load sample!”);
oled.display();
return;
}
oled.setFontType(3);
oled.print(paddingText);
oled.print(calibratedReading);
Serial.println(“real:” + String(rLevel));
Serial.println(“agtron:” + String(calibratedReading));
Serial.println(“===========================”);
oled.display();
}
int f(int x) {
int intersectionPoint = 117;
float deviation = 0.165;
return round(x - (intersectionPoint - x) * deviation);
}
void setup() {
Serial.begin(9600);
Wire.begin();
oled.begin(); // Initialize the OLED
oled.clear(ALL); // Clear the display’s internal memory
oled.clear(PAGE); // Clear the buffer.
delay(100); // Delay 100 ms
oled.setFontType(3);
// Initialize sensor
if (particleSensor.begin(Wire, I2C_SPEED_FAST) == false) // Use default I2C port, 400kHz speed
{
Serial.println("MAX30105 was not found. Please check wiring/power. ");
while (1)
;
}
// The variable below calibrates the LED output on your hardware.
byte ledBrightness = 135;
byte sampleAverage = 4; // Options: 1, 2, 4, 8, 16, --32–
byte ledMode = 2; // Options: 1 = Red only, --2 = Red + IR–, 3 = Red + IR + Green
int sampleRate = 50; // Options: 50, 100, 200, 400, 800, 1000, 1600, --3200–
int pulseWidth = 411; // Options: 69, 118, 215, --411–
int adcRange = 16384; // Options: 2048, --4096–, 8192, 16384
particleSensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange); // Configure sensor with these settings
particleSensor.setPulseAmplitudeRed(0);
particleSensor.setPulseAmplitudeGreen(0);
particleSensor.disableSlots();
particleSensor.enableSlot(2, 0x02); // Enable only SLOT_IR_LED = 0x02
// Update to ignore readings under 30.000
unblockedValue = 30000;
}
void loop() {
int rLevel = particleSensor.getIR();
long currentDelta = rLevel - unblockedValue;
if (currentDelta > (long)100) {
displayMeasurement(rLevel / 1000);
} else {
displayMeasurement(0);
}
delay(100);
}
