From 5bd075e078e1084503b3452c2681426b0fdba348 Mon Sep 17 00:00:00 2001
From: Pieter De Mil <pieter@demil.be>
Date: Wed, 20 Apr 2022 17:47:43 +0200
Subject: [PATCH] Add check on CO2 levels (<330, <400, >400)

---
 operame.ino | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/operame.ino b/operame.ino
index 0294315..e0ff964 100644
--- a/operame.ino
+++ b/operame.ino
@@ -147,6 +147,13 @@ void display_logo() {
     sprite.pushSprite(0, 0);
 }
 
+void display_cal() {
+    int fg, bg;
+    fg = TFT_WHITE;
+    bg = TFT_BLACK;
+    display_big(String("E 01"), fg, bg);
+}
+
 void display_ppm(int ppm) {
     int fg, bg;
     if (ppm >= co2_critical) {
@@ -595,10 +602,33 @@ void loop() {
             if (isnan(h) || isnan(t)) {
                 // Only display CO2 value (the old way)
                 // some MH-Z19's go to 10000 but the display has space for 4 digits
-                display_ppm(co2 > 9999 ? 9999 : co2);
+                 if(co2 < 330 )
+                {
+                    display_cal(); 
+                }
+                else if(co2 < 400)
+                {
+                    display_ppm(co2 < 399 ? 399 : co2);
+                }
+                else if(co2 >= 400)
+                {
+                    display_ppm(co2 > 9999 ? 9999 : co2);
+                }
+
             } else {
+                if(co2 < 330)
+                {
+                    display_cal();
+                }
+                else if(co2 < 400)
+                {
+                    display_ppm_t_h(co2 < 399 ? 399 : co2, t, h);
+                }
                 // Display also humidity and temperature
-                display_ppm_t_h(co2 > 9999 ? 9999 : co2, t, h);
+                else if(co2 >= 400)
+                {
+                    display_ppm_t_h(co2 > 9999 ? 9999 : co2, t, h);
+                }
             }
         }
     }