ENV III unit on M5Stack CoreInk

aafortinet

Hi,
Very n00b question, but how do I use the ENV III sensor on CoreInk? T
From sample code https://docs.m5stack.com/en/unit/envIII, I tried this but UNIT_ENV.h does not exist on CoreInk

#include "M5CoreInk.h"
#include "UNIT_ENV.h"

SHT3X sht30;
QMP6988 qmp6988;

Same #include "M5_ENV.h" does not exist either.
Thanks.

aafortinet

Ok - I found. You have to use #include "M5_ENV.h" and include the library M5UNIT-ENV in Arduino.

vuhn88

Not sure if you're referring to the hat or port ENV III but the get method of SHT3X didn't have the correct begin for the ENV III hat, so I brought the method into main and manually set up Wire.begin(25, 26) as seen below:

#include "M5CoreInk.h"
#include "M5_ENV.h"

//SHT3X sht30;
QMP6988 qmp6988;

float tmp      = 0.0;
float hum      = 0.0;
float pressure = 0.0;

Ink_Sprite InkPageSprite(&M5.M5Ink);

void setup() {

  M5.begin();
  Wire.begin(25, 26);

  qmp6988.init();

  if ( !M5.M5Ink.isInit()) {
    Serial.printf("Ink Init faild");
    while (1) delay(100);
  }
  M5.M5Ink.clear();   //Clear screen.
  delay(1000);
  if ( InkPageSprite.creatSprite(0, 0, 200, 200, true) != 0) {
    Serial.printf("Ink Sprite creat faild");
  }
}


byte getVal()
{
  unsigned int data[6];

  // Start I2C Transmission
  Wire.beginTransmission(0x44);

  // Send measurement command
  Wire.write(0x2C);
  Wire.write(0x06);

  // Stop I2C transmission
  if (Wire.endTransmission() != 0)
    return 1;

  delay(200);

  // Request 6 bytes of data
  Wire.requestFrom(0x44, 6);

  // Read 6 bytes of data
  // cTemp msb, cTemp lsb, cTemp crc, humidity msb, humidity lsb, humidity crc
  for (int i = 0; i < 6; i++) {
    data[i] = Wire.read();
  };

  delay(50);

  if (Wire.available() != 0)
    return 2;

  // Convert the data
  float cTemp = ((((data[0] * 256.0) + data[1]) * 175) / 65535.0) - 45;
  tmp = (cTemp * 1.8) + 32;
  hum = ((((data[3] * 256.0) + data[4]) * 100) / 65535.0);

  return 0;
}

void loop() {
  pressure = qmp6988.calcPressure();
  if (getVal() == 0) {
    char buf[20];

    snprintf(buf, 20, "Temp: %2.1f F", tmp);
    InkPageSprite.drawString(40, 20, buf);

    snprintf(buf, 20, "Humi: %2.0f%%", hum);
    InkPageSprite.drawString(40, 40, buf);

    snprintf(buf, 20, "Pres: %2.0f Pa", pressure);
    InkPageSprite.drawString(40, 60, buf);
  }

  InkPageSprite.pushSprite(); //Push the sprite to the screen.
  delay(1000);
}

It's pretty basic in functionality, but it works for the most part. And again, this is for the ENV III hat.

teastain

@vuhn88 Good to know! I also tried last week to run an ENVII on Stamp-C3 but the "get" didn't get! So I put the code inline as you did and it worked fine, then I wrote a new library (with the proven inline code) as a function with Return (value) and that worked as well. (just completed last night!)
The "get" is somehow the problem. Cheers!

ajb2k3

As you have noticed, "Get" isn't a stand alone function instead it is used to retrieve values and so is required to be used with a function.

teastain

@ajb2k3 The std ENV Library works with Stamp-PICO, but not Stamp-C3.
The GET works with PICO, not C3.
Bringing the library code into the Arduino void loop() works for both products.
I re-wrote the standard library to remove the GET and instead used this:
#include <SHT3Xnew.h>
unsigned int data[2];
float sensor() {
Wire.beginTransmission(0x44);
Wire.write(0x2C);
Wire.write(0x06);
if (Wire.endTransmission() != 0) {
Serial.println("not = 0 ");
}
delay(50);
Wire.requestFrom(0x44, 2);
data[0] = Wire.read();
data[1] = Wire.read();
delay(50);
return ((((data[0] * 256.0) + data[1]) * 175) / 65535.0) - 45;
}

This Library works with both, but is just a test, only reads cTemp, ;)

ajb2k3

@teastain Nice work.