small changes and many new sensors

2023-10-30 14:30:02 +01:00
parent 07917fe5ba
commit aad07c1b0a
21 changed files with 1642 additions and 297 deletions
--- a/ext/sens/SGP30.h
+++ b/ext/sens/SGP30.h
@@ -0,0 +1,109 @@
+ 
+#pragma once
+
+/**
+ * air quality sensor
+ * https://sensirion.com/media/documents/984E0DD5/61644B8B/Sensirion_Gas_Sensors_Datasheet_SGP30.pdf
+ */
+template <typename I2C> class SGP30 {
+	
+private:
+
+	I2C& i2c;
+	static constexpr const uint8_t ADDR = 0x58;
+	static constexpr const char* NAME = "SGP30";
+	
+	static constexpr const uint16_t CMD_IAQ_INIT = 0x2003;
+	static constexpr const uint16_t CMD_IAQ_MEASURE = 0x2008;
+	static constexpr const uint16_t CMD_GET_SERIAL = 0x3682;
+
+
+public:
+
+	SGP30(I2C& i2c) : i2c(i2c) {
+		
+	}
+	
+	void init() {
+		sendCommand(CMD_IAQ_INIT);
+	}		
+		
+	/** is the device present on the bus? */
+	bool isPresent() {
+		return i2c.query(ADDR);
+	}
+	
+
+	struct Result {
+		uint16_t co2e;
+		uint16_t tvoc;
+	};
+		
+	/** should be called ~ every second */	
+	Result measure() {
+		
+		sendCommand(CMD_IAQ_MEASURE);
+		vTaskDelay(100 / portTICK_PERIOD_MS);
+		
+		uint8_t tmp[6];
+		i2c.readRaw(ADDR, 6, tmp);
+		
+		Result res;
+		res.co2e = (tmp[0]<<8) | (tmp[1]<<0);
+		res.tvoc = (tmp[3]<<8) | (tmp[4]<<0);
+		return res;
+		
+	}
+	
+	void getSerial() {
+		
+		struct Serial {
+			uint8_t v1[2];
+			uint8_t crc1;
+			uint8_t v2[2];
+			uint8_t crc2;
+			uint8_t v3[2];
+			uint8_t crc3;
+		} serial;
+		
+		sendCommand(CMD_GET_SERIAL);
+		uint8_t tmp[9];
+		i2c.readRaw(ADDR, 9, &serial);
+		/*
+		uint8_t a = calcCRC(tmp+0, 2);
+		uint8_t b = calcCRC(tmp+3, 2);
+		uint8_t c = calcCRC(tmp+6, 2);
+
+		printf("%d %d %d %d\n", tmp[0], tmp[1], tmp[2], a);
+		printf("%d %d %d %d\n", tmp[3], tmp[4], tmp[5], b);
+		printf("%d %d %d %d\n", tmp[6], tmp[7], tmp[8], c);
+		*/
+	}
+		
+		
+private:
+
+	void sendCommand(uint16_t cmd) {
+		uint8_t tmp[2];
+		tmp[0] = cmd >> 8;
+		tmp[1] = cmd >> 0;
+		i2c.writeRaw(ADDR, 2, tmp);
+	}
+	
+	static uint8_t calcCRC(const uint8_t* data, uint8_t len) {
+		uint8_t crc = 0xff;
+		for (uint8_t i = 0; i < len; i++) {
+			crc ^= data[i];
+			for (uint8_t j = 0; j < 8; j++) {
+				if ((crc & 0x80) != 0) {
+					crc = (uint8_t)((crc << 1) ^ 0x31);
+				} else {
+					crc <<= 1;
+				}
+			}
+		}
+		return crc;
+	}
+
+	
+};