From 599137c7b438e56e16185f3981b023e03c0e0397 Mon Sep 17 00:00:00 2001
From: damage <damage@devloop.de>
Date: Sun, 13 Sep 2026 20:07:41 +0200
Subject: [PATCH] init ci

---
 templog.ino | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 templog.ino

diff --git a/templog.ino b/templog.ino
new file mode 100644
index 0000000..97f6318
--- /dev/null
+++ b/templog.ino
@@ -0,0 +1,84 @@
+#include <OneWire.h>
+#include <DallasTemperature.h>
+#include <U8g2lib.h>
+#include <SD.h>
+
+#define ONE_WIRE_BUS D4
+#define PIN_CS D8
+
+#define STATUS_OK 0
+#define STATUS_SD_INIT_FAILED 1
+#define STATUS_SD_WRITE_FAILED 2
+
+#define ODD 1
+#define EVEN 2
+
+OneWire oneWire( ONE_WIRE_BUS );
+DallasTemperature DS18B20( &oneWire );
+U8G2_SSD1306_128X64_NONAME_F_HW_I2C display(U8G2_R0);
+
+
+int status = STATUS_OK;
+int oddEvenLoop = ODD;
+
+void setup() {
+  Serial.begin(115200);
+  DS18B20.begin();
+  display.begin();
+
+  if (!SD.begin(PIN_CS)) {
+    status = STATUS_SD_INIT_FAILED;
+  }
+}
+
+void loop() {
+  char tempStr[6];
+  long uptimeSec = millis() / 1000;
+
+  DS18B20.requestTemperatures();
+  float tempFl = DS18B20.getTempCByIndex(0);
+
+  dtostrf(tempFl, 4, 1, tempStr);
+
+  Serial.print(uptimeSec);
+  Serial.print(": ");
+  Serial.println(tempStr);
+
+  display.clearBuffer();
+  display.setFont(u8g2_font_fub11_tf);
+  switch(status) {
+    case STATUS_SD_INIT_FAILED:
+      display.drawStr(0, 11, "SD init failed");
+      break;
+    case STATUS_SD_WRITE_FAILED:
+      display.drawStr(0, 11, "SD write failed");
+      break;
+    case STATUS_OK:
+    default:
+      if (oddEvenLoop == ODD) {
+        display.drawStr(0, 11, "Temperatur *");
+        oddEvenLoop = EVEN;
+      } else {
+        display.drawStr(0, 11, "Temperatur #");
+        oddEvenLoop = ODD;
+      }
+  }
+  display.setFont(u8g2_font_fub42_tn);
+  display.drawStr(8, 63, tempStr);
+  display.sendBuffer();
+
+  if (status != STATUS_SD_INIT_FAILED) {
+    File fd = SD.open("temp.csv", FILE_WRITE);
+    if (fd) {
+      fd.print(uptimeSec);
+      fd.print(";");
+      fd.println(tempStr);
+      fd.close();
+      status = STATUS_OK;
+    } else {
+      status = STATUS_SD_WRITE_FAILED;
+    }
+  }
+  
+  delay(5000);
+}