From a8241a11bf83c445328a5e6d5be686d339c4afe7 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Fri, 4 Feb 2022 12:51:07 +0000
Subject: use SPS30 as well

---
 README.md |  6 +++++
 main.ino  | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++-------------
 2 files changed, 72 insertions(+), 16 deletions(-)

diff --git a/README.md b/README.md
index 2cdf469..7078be3 100644
--- a/README.md
+++ b/README.md
@@ -36,3 +36,9 @@ SCD41:
 * 3 VDD white/red
 * 4 SDA green
 
+SPS30:
+* 1 VDD black
+* 2 SDA red
+* 3 SCL white
+* 4 SEL yellow → GND
+* 5 GND orange
diff --git a/main.ino b/main.ino
index 604bdef..cb5d21a 100644
--- a/main.ino
+++ b/main.ino
@@ -1,5 +1,6 @@
 #include <Arduino.h>
 #include <SensirionI2CScd4x.h>
+#include <sps30.h>
 #include <Wire.h>
 
 #define LILYGO_T5_V213 // needed for the display libraries
@@ -7,7 +8,7 @@
 #include <boards.h>
 #include <GxEPD.h>
 #include <GxGDEH0213B73/GxGDEH0213B73.h>  // screen model, probably correct
-#include <Fonts/FreeMonoBold12pt7b.h>
+#include <Fonts/FreeMonoBold9pt7b.h>
 #include <GxIO/GxIO_SPI/GxIO_SPI.h>
 #include <GxIO/GxIO.h>
 
@@ -40,6 +41,7 @@ void setup() {
         delay(100);
     }
 
+    // the board's definition says SCL=23, but I have SCL=22
     Wire.begin(21,22);
 
     SPI.begin(EPD_SCLK, EPD_MISO, EPD_MOSI);
@@ -47,7 +49,7 @@ void setup() {
     display.init();
     display.setTextColor(GxEPD_BLACK);
     display.setRotation(3);
-    display.setFont(&FreeMonoBold12pt7b);
+    display.setFont(&FreeMonoBold9pt7b);
     display.fillScreen(GxEPD_WHITE);
     display.update();
 
@@ -84,6 +86,29 @@ void setup() {
         Serial.println(errorMessage);
     }
 
+    // this will try to re-init Wire, emit a warning, and carry on
+    sensirion_i2c_init();
+
+    while (sps30_probe() != 0) {
+      Serial.print("SPS sensor probing failed\n");
+      delay(500);
+    }
+
+    int16_t ret;
+    uint8_t auto_clean_days = 4;
+    uint32_t auto_clean;
+
+    ret = sps30_set_fan_auto_cleaning_interval_days(auto_clean_days);
+    if (ret) {
+      Serial.print("error setting the auto-clean interval: ");
+      Serial.println(ret);
+    }
+
+    ret = sps30_start_measurement();
+    if (ret < 0) {
+      Serial.print("error starting measurement\n");
+    }
+
     Serial.println("Waiting for first measurement... (5 sec)");
 }
 
@@ -99,23 +124,48 @@ void loop() {
     float humidity = 0.0f;
     error = scd4x.readMeasurement(co2, temperature, humidity);
 
+    struct sps30_measurement m;
+    char serial[SPS30_MAX_SERIAL_LEN];
+    uint16_t data_ready;
+    int16_t ret;
+
+    do {
+      ret = sps30_read_data_ready(&data_ready);
+      if (ret < 0) {
+        Serial.print("error reading data-ready flag: ");
+        Serial.println(ret);
+      } else if (!data_ready)
+        Serial.print("data not ready, no new measurement available\n");
+      else
+        break;
+      delay(100); /* retry in 100ms */
+    } while (1);
+
+    ret = sps30_read_measurement(&m);
+
+    if (error || ret <0 || co2 ==0) {
+      return;
+    }
+
     display.fillScreen(GxEPD_WHITE);
     display.setCursor(0,20);
 
-    if (error) {
-        display.print("read error: ");
-        errorToString(error, errorMessage, 256);
-        display.println(errorMessage);
-    } else if (co2 == 0) {
-        display.println("Invalid sample detected, skipping.");
-    } else {
-        display.print("Co2:");
-        display.println(co2);
-        display.print("Temperature:");
-        display.println(temperature);
-        display.print("Humidity:");
-        display.println(humidity);
-    }
+    display.print("Co2:");
+    display.println(co2);
+    display.print("T:");
+    display.print(temperature);
+    display.print(" H:");
+    display.println(humidity);
+
+    display.print("PM 1:");
+    display.print(m.mc_1p0);
+    display.print(" PM 2.5:");
+    display.println(m.mc_2p5);
+
+    display.print("PM 4:");
+    display.print(m.mc_4p0);
+    display.print(" PM 10:");
+    display.println(m.mc_10p0);
 
     display.update();
 }
-- 
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