Added WiFi connection to thingspeak (unfinished, requires better

reconnect and more)
2025-12-23 22:18:27 +01:00 · 2019-04-14 09:30:09 +02:00
parent aa000ae1e1
commit efa607eeca
8 changed files with 270 additions and 111 deletions
--- a/display.cpp
+++ b/display.cpp
@@ -0,0 +1,100 @@
+#include "U8g2lib.h"
+
+#include "display.h"
+
+// OLED display 128x64 with SH1106 controller
+// on I2C GPIOs SCL 22 and SDA 21
+U8G2_SH1106_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, 22, 21);
+
+void initDisplay() {
+	// high I2c clock still results in about 100ms buffer transmission to OLED:
+	u8g2.setBusClock(1000000);
+	u8g2.begin();
+}
+
+void renderDigits(char uSphStr[16], char cpmStr[16]) {
+	uint16_t y = 14;
+	uint16_t xCpm = 56;
+	uint16_t xUSph = 127;
+
+	u8g2.setFont(u8g2_font_crox4hb_tr);
+	u8g2_uint_t w = u8g2.getStrWidth(uSphStr);
+	u8g2.setCursor(xUSph - w, y);
+	u8g2.print(uSphStr);
+
+	w = u8g2.getStrWidth(cpmStr);
+	u8g2.setCursor(xCpm - w, y);
+	u8g2.print(cpmStr);
+
+	y = 21;
+	u8g2.setFont(u8g2_font_4x6_tf);
+	w = u8g2.getStrWidth("<EFBFBD>S/h");
+	u8g2.setCursor(xUSph - w, y);
+	u8g2.print("<EFBFBD>S/h");
+
+	w = u8g2.getStrWidth("cnt/min");
+	u8g2.setCursor(xCpm - w, y);
+	u8g2.print("cnt/min");
+}
+
+void renderHistoryBarGraph(GeigerData &geigerData) {
+	const uint16_t bars = 120;
+	const uint16_t maxBarHeight = 40;
+	const uint16_t samplesPerBar = geigerData.sampleCount / bars;
+	const uint16_t barsPerMinute = 60
+			/ (samplesPerBar * geigerData.sampleSeconds);
+
+	// determine max value for y scale:
+	uint16_t offset = geigerData.getCurrentSample() % samplesPerBar + 1;
+	uint32_t maxPulses = 0;
+	for (int16_t i = 0; i < bars - 1; i++) {
+		const uint32_t prevPulses = geigerData.getPreviousPulses(offset,
+				samplesPerBar);
+		if (prevPulses > maxPulses)
+			maxPulses = prevPulses;
+
+		offset += samplesPerBar;
+	}
+
+	const float maxUSph = geigerData.toMicroSievertPerHour(maxPulses,
+			samplesPerBar);
+	const float uSphPerPixel = maxUSph > 40. ? 10. : maxUSph > 4. ? 1. :
+								maxUSph > 0.4 ? 0.1 : 0.01;
+	// labels and grid
+	u8g2.setFont(u8g2_font_4x6_tn);
+	char s[10];
+	for (uint16_t i = 10; i <= maxBarHeight; i += 10) {
+		u8g2.setCursor(0, 63 - i + 3);
+		if (uSphPerPixel >= 0.1)
+			sprintf(s, "%.0f", i * uSphPerPixel);
+		else
+			sprintf(s, ".%.0f", i * uSphPerPixel * 10);
+
+		u8g2.print(s);
+		for (int16_t x = 127 - barsPerMinute; x >= 8; x -= barsPerMinute) {
+			u8g2.drawPixel(x, 63 - i);
+		}
+	}
+
+	// bars
+	offset = geigerData.getCurrentSample() % samplesPerBar + 1;
+	for (int16_t i = 0; i < bars - 1; i++) {
+		const uint32_t prevPulses = geigerData.getPreviousPulses(offset,
+				samplesPerBar);
+		const float uSph = geigerData.toMicroSievertPerHour(prevPulses,
+				samplesPerBar);
+		offset += samplesPerBar;
+		uint16_t barHeight = 1 + (int) ((uSph / uSphPerPixel));
+		if (barHeight > 40)
+			barHeight = 40;
+
+		u8g2.drawVLine(127 - i, 63 - barHeight, barHeight);
+	}
+}
+
+void updateDisplay(GeigerData &geigerData, char uSphStr[16], char cpmStr[16]) {
+	u8g2.clearBuffer();
+	renderDigits(uSphStr, cpmStr);
+	renderHistoryBarGraph(geigerData);
+	u8g2.sendBuffer();
+}