mqtt, esp: add new esp8266-based device

1 files changed, 53 insertions, 0 deletions

diff --git a/platformio/temphum/src/temphum.cpp b/platformio/temphum/src/temphum.cpp
new file mode 100644
index 0000000..0b6fbbe
--- /dev/null
+++ b/platformio/temphum/src/temphum.cpp
@@ -0,0 +1,53 @@
+#include "temphum.h"
+#include "logging.h"
+#include <Arduino.h>
+
+namespace homekit::temphum {
+
+static const int addr = 0x40;
+
+void setup() {
+    pinMode(D2, OUTPUT);
+    pinMode(D3, OUTPUT);
+
+    Wire.begin(D2, D3);
+
+    Wire.beginTransmission(addr);
+    Wire.write(0xfe);
+    Wire.endTransmission();
+
+    delay(500);
+}
+
+struct data read() {
+    // Request temperature measurement from the Si7021 sensor
+    Wire.beginTransmission(addr);
+    Wire.write(0xF3); // command to measure temperature
+    Wire.endTransmission();
+
+    delay(500); // wait for the measurement to be ready
+
+    // Read the temperature measurement from the Si7021 sensor
+    Wire.requestFrom(addr, 2);
+    uint16_t temp_raw = Wire.read() << 8 | Wire.read();
+    double temperature = ((175.72 * temp_raw) / 65536.0) - 46.85;
+
+    // Request humidity measurement from the Si7021 sensor
+    Wire.beginTransmission(addr);
+    Wire.write(0xF5); // command to measure humidity
+    Wire.endTransmission();
+
+    delay(500); // wait for the measurement to be ready
+
+    // Read the humidity measurement from the Si7021 sensor
+    Wire.requestFrom(addr, 2);
+    uint16_t hum_raw = Wire.read() << 8 | Wire.read();
+    double humidity = ((125.0 * hum_raw) / 65536.0) - 6.0;
+
+    return {
+        .temp = temperature,
+        .rh = humidity
+    };
+}
+
+}
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