From 99be6b6d2a0f5a31b1d9ade85e2988ee357e4294 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Fri, 28 Jan 2022 16:42:14 +0000
Subject: show values on eink display

---
 .gitmodules          |  9 +++++++++
 Adafruit-GFX-Library |  1 +
 Adafruit_BusIO       |  1 +
 GxEPD                |  1 +
 Makefile             |  4 ++--
 main.ino             | 49 ++++++++++++++++++++++++++++++++++++++-----------
 6 files changed, 52 insertions(+), 13 deletions(-)
 create mode 160000 Adafruit-GFX-Library
 create mode 160000 Adafruit_BusIO
 create mode 160000 GxEPD

diff --git a/.gitmodules b/.gitmodules
index ad61b56..3b4bde0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,12 @@
 [submodule "arduino-core"]
 	path = arduino-core
 	url = https://github.com/Sensirion/arduino-core
+[submodule "Adafruit-GFX-Library"]
+	path = Adafruit-GFX-Library
+	url = https://github.com/adafruit/Adafruit-GFX-Library
+[submodule "GxEPD"]
+	path = GxEPD
+	url = https://github.com/lewisxhe/GxEPD
+[submodule "Adafruit_BusIO"]
+	path = Adafruit_BusIO
+	url = https://github.com/adafruit/Adafruit_BusIO
diff --git a/Adafruit-GFX-Library b/Adafruit-GFX-Library
new file mode 160000
index 0000000..4a33fcd
--- /dev/null
+++ b/Adafruit-GFX-Library
@@ -0,0 +1 @@
+Subproject commit 4a33fcd467e373d1eedd3aef6f5f9be36f5c276b
diff --git a/Adafruit_BusIO b/Adafruit_BusIO
new file mode 160000
index 0000000..afbd408
--- /dev/null
+++ b/Adafruit_BusIO
@@ -0,0 +1 @@
+Subproject commit afbd408d17cf3ec6f2da5902b99cf5f169703de0
diff --git a/GxEPD b/GxEPD
new file mode 160000
index 0000000..fe0bd75
--- /dev/null
+++ b/GxEPD
@@ -0,0 +1 @@
+Subproject commit fe0bd756a47e7cb482311b367a15d86f3d65d45e
diff --git a/Makefile b/Makefile
index 72d8f7e..297087f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
 SKETCH = main.ino
-CUSTOM_LIBS = arduino-core arduino-i2c-scd4x arduino-sps
+LIBS = $(abspath arduino-core arduino-i2c-scd4x arduino-sps GxEPD Adafruit-GFX-Library Adafruit_BusIO)
 
 UPLOAD_PORT = /dev/ttyUSB0
 # maybe board with eink?
 BOARD = ttgo-t1
 
-ESP_ROOT = $(HOME)/Arduino/hardware/espressif/esp32/
+ESP_ROOT = $(HOME)/HW/arduino-esp32
 CHIP = esp32
 
 include $(HOME)/src/makeEspArduino/makeEspArduino.mk
diff --git a/main.ino b/main.ino
index bc27deb..604bdef 100644
--- a/main.ino
+++ b/main.ino
@@ -2,6 +2,20 @@
 #include <SensirionI2CScd4x.h>
 #include <Wire.h>
 
+#define LILYGO_T5_V213 // needed for the display libraries
+
+#include <boards.h>
+#include <GxEPD.h>
+#include <GxGDEH0213B73/GxGDEH0213B73.h>  // screen model, probably correct
+#include <Fonts/FreeMonoBold12pt7b.h>
+#include <GxIO/GxIO_SPI/GxIO_SPI.h>
+#include <GxIO/GxIO.h>
+
+GxIO_Class io(SPI,  EPD_CS, EPD_DC,  EPD_RSET);
+GxEPD_Class display(io, EPD_RSET, EPD_BUSY);
+SPIClass SDSPI(VSPI); // for sdcard? maybe?
+
+
 SensirionI2CScd4x scd4x;
 
 void printUint16Hex(uint16_t value) {
@@ -28,6 +42,15 @@ void setup() {
 
     Wire.begin(21,22);
 
+    SPI.begin(EPD_SCLK, EPD_MISO, EPD_MOSI);
+
+    display.init();
+    display.setTextColor(GxEPD_BLACK);
+    display.setRotation(3);
+    display.setFont(&FreeMonoBold12pt7b);
+    display.fillScreen(GxEPD_WHITE);
+    display.update();
+
     uint16_t error;
     char errorMessage[256];
 
@@ -75,20 +98,24 @@ void loop() {
     float temperature = 0.0f;
     float humidity = 0.0f;
     error = scd4x.readMeasurement(co2, temperature, humidity);
+
+    display.fillScreen(GxEPD_WHITE);
+    display.setCursor(0,20);
+
     if (error) {
-        Serial.print("Error trying to execute readMeasurement(): ");
+        display.print("read error: ");
         errorToString(error, errorMessage, 256);
-        Serial.println(errorMessage);
+        display.println(errorMessage);
     } else if (co2 == 0) {
-        Serial.println("Invalid sample detected, skipping.");
+        display.println("Invalid sample detected, skipping.");
     } else {
-        Serial.print("Co2:");
-        Serial.print(co2);
-        Serial.print("\t");
-        Serial.print("Temperature:");
-        Serial.print(temperature);
-        Serial.print("\t");
-        Serial.print("Humidity:");
-        Serial.println(humidity);
+        display.print("Co2:");
+        display.println(co2);
+        display.print("Temperature:");
+        display.println(temperature);
+        display.print("Humidity:");
+        display.println(humidity);
     }
+
+    display.update();
 }
-- 
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