[Issue #2] - adding initial support for SSD1306 displays

main.go

@@ -9,6 +9,11 @@ import (
 	"machine"
 	"strconv"
 	"time"
+	"image/color"
+
+	"tinygo.org/x/drivers/ssd1306"
+	"tinygo.org/x/tinyfont"
+	"tinygo.org/x/tinyfont/proggy"
 )
 
 var StateTopic = fmt.Sprintf("homeassistant/sensor/%s/state", NodeID)
@@ -292,10 +297,10 @@ func panicErr(msg string, err error) {
 func main() {
 	time.Sleep(2 * time.Second)
 
-	// Configure I2C (Pin 16 SDA, Pin 17 SCL -> I2C0)
+	// Bump frequency to 400kHz for snappy display flushes
 	i2c := machine.I2C0
 	err := i2c.Configure(machine.I2CConfig{
-		Frequency: 100 * machine.KHz,
+		Frequency: 400 * machine.KHz,
 		SDA:       machine.GPIO16,
 		SCL:       machine.GPIO17,
 	})
@@ -303,6 +308,18 @@ func main() {
 		panicErr("I2C configuration", err)
 	}
 
+	// Initialize OLED (shares the same I2C bus at 0x3C)
+	oled := ssd1306.NewI2C(i2c)
+	oled.Configure(ssd1306.Config{
+		Address: 0x3C, // Check 0x3D if 0x3C doesn't respond
+		Width:   128,
+		Height:  64,
+	})
+	oled.ClearBuffer()
+	white := color.RGBA{R: 255, G: 255, B: 255, A: 255}
+	tinyfont.WriteLine(oled, &proggy.TinySZ8pt7b, 0, 16, "Booting...", white)
+	oled.Display()
+
 	bme, err := NewBME280(i2c, BME280Addr)
 	if err != nil {
 		panicErr("BME280 init", err)
@@ -338,12 +355,21 @@ func main() {
 		if err != nil {
 			println("BME280 read error:", err.Error())
 		} else {
+			// Publish MQTT
 			stateJSON := fmt.Sprintf(`{"temperature":%.2f,"humidity":%.2f,"pressure":%.2f}`, t, h, p)
 			if err := mqtt.Publish(StateTopic, []byte(stateJSON), false); err != nil {
 				println("MQTT publish error:", err.Error())
 			} else {
 				println(fmt.Sprintf("[%s] Published: %s", NodeName, stateJSON))
 			}
+
+			// Render to OLED
+			oled.ClearBuffer()
+			tinyfont.WriteLine(oled, &proggy.TinySZ8pt7b, 0, 14, fmt.Sprintf("Node: %s", NodeName), white)
+			tinyfont.WriteLine(oled, &proggy.TinySZ8pt7b, 0, 30, fmt.Sprintf("Temp: %.1f C", t), white)
+			tinyfont.WriteLine(oled, &proggy.TinySZ8pt7b, 0, 46, fmt.Sprintf("Hum:  %.1f %%", h), white)
+			tinyfont.WriteLine(oled, &proggy.TinySZ8pt7b, 0, 60, fmt.Sprintf("Pres: %.1f hPa", p), white)
+			oled.Display()
 		}
 
 		time.Sleep(UpdateInterval)