mirror of
https://github.com/RobTillaart/Arduino.git
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124 lines
2.0 KiB
C++
124 lines
2.0 KiB
C++
//
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// FILE: SHT2x_nolib.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// PURPOSE: test sensor without library
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// URL: https://github.com/RobTillaart/SHT2x
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#include "Wire.h"
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uint8_t status = 0;
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void setup()
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{
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Serial.begin(115200);
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Serial.println(__FILE__);
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Wire.begin();
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Wire.setClock(100000);
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testConnected();
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}
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void loop()
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{
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delay(1000);
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float t = getTemperature();
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Serial.print(t, 2);
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Serial.print("\t");
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Serial.println(status, HEX);
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delay(1000);
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float h = getHumidity();
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Serial.print(h, 2);
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Serial.print("\t");
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Serial.println(status, HEX);
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}
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///////////////////////////////////////////////////
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void testConnected()
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{
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Wire.beginTransmission(0x40);
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int rv = Wire.endTransmission();
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if (rv != 0) Serial.println("CONNECT FAILED");
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else Serial.println("CONNECTED");
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}
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float getTemperature()
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{
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uint16_t raw = 0;
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Wire.beginTransmission(0x40);
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Wire.write(0xF3);
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if (Wire.endTransmission() != 0)
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{
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Serial.println("ERR 1");
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return 0.0;
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}
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delay(90);
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Wire.requestFrom(0x40, 3);
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uint32_t start = millis();
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while (Wire.available() < 3)
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{
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if (millis() - start > 90)
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{
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Serial.println("ERR 2");
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return 0.0;
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}
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yield();
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}
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raw = Wire.read() << 8;
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raw += Wire.read();
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status = raw & 0x0003;
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raw &= 0xFFFC;
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Serial.print("RAW TEM: ");
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Serial.println(raw, HEX);
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return -46.85 + (175.72 / 65536.0) * raw;
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}
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float getHumidity()
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{
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uint16_t raw = 0;
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Wire.beginTransmission(0x40);
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Wire.write(0xF5);
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if (Wire.endTransmission() != 0)
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{
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Serial.println("ERR 11");
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return 0.0;
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}
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delay(30);
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Wire.requestFrom(0x40, 3);
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uint32_t start = millis();
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while (Wire.available() < 3)
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{
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if (millis() - start > 30)
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{
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Serial.println("ERR 12");
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return 0.0;
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}
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yield();
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}
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raw = Wire.read() << 8;
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raw += Wire.read();
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status = raw & 0x0003;
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raw &= 0xFFFC;
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Serial.print("RAW HUM: ");
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Serial.println(raw, HEX);
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return -6.0 + (125.0 / 65536.0) * raw;
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}
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// -- END OF FILE --
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