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Add Arduino SHT library to fix issue with newer SHT sensors #45

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Add Arduino SHT library to fix issue with newer SHT sensors #45

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82eacc5
Add Arduino SHT library to fix issue with newer SHT sensors
hugoyervides May 10, 2024
0af4556
Add Arduino SHT library to github action
hugoyervides May 10, 2024
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5 changes: 5 additions & 0 deletions .github/workflows/arduino.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -44,5 +44,10 @@ jobs:
arduino-cli lib install "U8g2"@2.34.22
# https://github.com/olikraus/u8g2

- name: Install Arduino SHT library
run: |
arduino-cli lib install "arduino-sht"@1.2.5
# https://github.com/Sensirion/arduino-sht

- name: Compile Sketch
run: arduino-cli compile --fqbn esp8266:esp8266:d1_mini ./AirGradient-DIY
37 changes: 20 additions & 17 deletions AirGradient-DIY/AirGradient-DIY.ino
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Expand Up @@ -9,6 +9,7 @@
#include <WiFiClient.h>
#include <Wire.h>
#include <U8g2lib.h>
#include "SHTSensor.h"

// TODO; refactor when AirGradient library gets support for SGP41 (not supported 02/10/2023 @ v2.4.6)
#include <SensirionI2CSgp41.h>
Expand Down Expand Up @@ -45,6 +46,9 @@ const bool verbose = false;
#define SET_DISPLAY
#define staticip

// SHT sensor accuracy.
const SHTSensor::SHTAccuracy shtAccuracy = SHTSensor::SHT_ACCURACY_MEDIUM;

// WiFi and IP connection info.
const char* ssid = "PleaseChangeMe";
const char* password = "PleaseChangeMe";
Expand All @@ -70,11 +74,11 @@ const int updateFrequency = 5000;
#define ERROR_SGP 0x04

AirGradient ag = AirGradient();
SHTSensor sht;

#ifdef SET_SHT
TMP_RH value_sht;
float prev_value_temp = -1;
int prev_value_rh = -1;
float value_temp = -1;
int value_rh = -1;
#endif

#ifdef SET_PM
Expand Down Expand Up @@ -119,7 +123,8 @@ void setup() {
ag.CO2_Init();
#endif // SET_CO2
#ifdef SET_SHT
ag.TMP_RH_Init(0x44);
sht.init();
sht.setAccuracy(shtAccuracy);
#endif // SET_SHT
#ifdef SET_SGP
sgp41.begin(Wire);
Expand Down Expand Up @@ -247,13 +252,11 @@ uint8_t update() {

#ifdef SET_SHT
{
TMP_RH value = ag.periodicFetchData();
if (value.t != NULL && value.rh != NULL) {
value_sht = value;
prev_value_temp = value.t;
prev_value_rh = value.rh;
if (sht.readSample()) {
value_temp = sht.getTemperature();
value_rh = sht.getHumidity();
if (verbose) {
Serial.println("t: " + String(value_sht.t) + "\t rh: " + String(value_sht.rh));
Serial.println("t: " + String(value_temp) + "\t rh: " + String(value_rh));
}
} else {
result += ERROR_SHT;
Expand All @@ -274,12 +277,12 @@ uint8_t update() {

// do compensation on available metrics, falling back to default indoor compensation values
if (result & ERROR_SHT) {
if (prev_value_temp == -1 || prev_value_rh == -1) {
if (value_temp == -1 || value_rh == -1) {
compensationT = defaultCompensationT;
compensationRh = defaultCompensationRh;
} else {
compensationT = static_cast<uint16_t>((value_sht.t + 45) * 65535 / 175);
compensationRh = static_cast<uint16_t>(value_sht.rh * 65535 / 100);
compensationT = static_cast<uint16_t>((value_temp + 45) * 65535 / 175);
compensationRh = static_cast<uint16_t>(value_rh * 65535 / 100);
}
}

Expand Down Expand Up @@ -350,12 +353,12 @@ String GenerateMetrics() {
message += "# TYPE atmp gauge\n";
message += "atmp";
message += idString;
message += String(value_sht.t);
message += String(value_temp);
message += "\n# HELP rhum Relative humidity, in percent\n";
message += "# TYPE rhum gauge\n";
message += "rhum";
message += idString;
message += String(value_sht.rh);
message += String(value_rh);
message += "\n";
}
#endif // SET_SHT
Expand Down Expand Up @@ -413,9 +416,9 @@ void updateOLED() {

String ln3;
if (temp_display != 'C') {
ln3 = "F:" + String((value_sht.t * 9 / 5) + 32) + " H:" + String(value_sht.rh) + "%";
ln3 = "F:" + String((value_temp * 9 / 5) + 32) + " H:" + String(value_rh) + "%";
} else {
ln3 = "C:" + String(value_sht.t) + " H:" + String(value_sht.rh) + "%";
ln3 = "C:" + String(value_temp) + " H:" + String(value_rh) + "%";
}
updateOLEDString(ln1, ln2, ln3);
}
Expand Down
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