show values on eink display

6 files changed, 49 insertions, 13 deletions

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
+Subproject 4a33fcd467e373d1eedd3aef6f5f9be36f5c276
diff --git a/Adafruit_BusIO b/Adafruit_BusIO
new file mode 160000
+Subproject afbd408d17cf3ec6f2da5902b99cf5f169703de
diff --git a/GxEPD b/GxEPD
new file mode 160000
+Subproject fe0bd756a47e7cb482311b367a15d86f3d65d45
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();
 }