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Experimental support for mystery sensor

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This commit is contained in:
Juerd Waalboer 2020-12-15 02:25:24 +01:00
parent 6c7bb2c4a3
commit 6f4ac2b01b
1 changed files with 83 additions and 19 deletions
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102
operame.ino
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@ -3,7 +3,7 @@
#include <MQTT.h> #include <MQTT.h>
#include <SPIFFS.h> #include <SPIFFS.h>
#include <WiFiSettings.h> #include <WiFiSettings.h>
#include <MHZ19.h> //#include <MHZ19.h>
#include <ArduinoOTA.h> #include <ArduinoOTA.h>
#include <SPI.h> #include <SPI.h>
#include <TFT_eSPI.h> #include <TFT_eSPI.h>
@ -26,7 +26,7 @@ MQTTClient mqtt;
HardwareSerial hwserial1(1); HardwareSerial hwserial1(1);
TFT_eSPI display; TFT_eSPI display;
TFT_eSprite sprite(&display); TFT_eSprite sprite(&display);
MHZ19 mhz; //MHZ19 mhz;
String mqtt_topic; String mqtt_topic;
String mqtt_template; String mqtt_template;
bool add_units; bool add_units;
@ -153,20 +153,68 @@ void setup() {
} }
hwserial1.begin(9600, SERIAL_8N1, 27, 26); hwserial1.begin(9600, SERIAL_8N1, 27, 26);
mhz.begin(hwserial1);
/*
// senseair?
// hwserial1.print("\xfe\x41\0\x80\x01\x10\x28\x7e");
// delay(1000);
// hwserial1.print("\xfe\x44\0\0\x08\x20\x79\x3c");
// nope
// HCC-ding?
hwserial1.print("\x5c\x01\xc5\0\0\0\0\0\xDD");
// nope
// zelfde protocol maar dan anders?
uint8_t p[9];
p[1] = 0x01;
p[2] = 0xc5;
while (1) {
for (int i = 255; i < 256; i++) {
p[0] = i;
int sum = 0;
for (int c = 0; c < 8; c++) {
Serial.print(p[c], HEX);
Serial.print(" ");
sum += p[c];
}
p[8] = 255 - (sum % 256);
Serial.println(p[8], HEX);
hwserial1.write(p, 9);
delay(50);
if (hwserial1.available()) {
Serial.println("JAAAAAAAAAAAAAAAAAAAA");
while (hwserial1.available()) {
int c = hwserial1.read();
if (c != -1) Serial.println(c, HEX);
}
}
delay(1000);
}
}
while (1) {
int c = hwserial1.read();
if (c != -1) Serial.println(c, HEX);
}
*/
//mhz.begin(hwserial1);
display_logo(); display_logo();
delay(2000); delay(2000);
check_sensor(); //check_sensor();
// mhz.setFilter(true, true); Library filter doesn't handle 0436 //// mhz.setFilter(true, true); Library filter doesn't handle 0436
mhz.autoCalibration(true); //mhz.autoCalibration(true);
char v[5]; //char v[5];
mhz.getVersion(v); //mhz.getVersion(v);
v[4] = '\0'; //v[4] = '\0';
if (strcmp("0436", v) == 0) co2_init = 436; //if (strcmp("0436", v) == 0) co2_init = 436;
Serial.printf("MH-Z19 firmware version %s\n", v); //Serial.printf("MH-Z19 firmware version %s\n", v);
WiFiSettings.hostname = "operame-"; WiFiSettings.hostname = "operame-";
wifi_enabled = WiFiSettings.checkbox("operame_wifi", false, "WiFi-verbinding gebruiken"); wifi_enabled = WiFiSettings.checkbox("operame_wifi", false, "WiFi-verbinding gebruiken");
@ -229,6 +277,7 @@ void connect_mqtt() {
} }
void check_sensor() { void check_sensor() {
/*
if (mhz.errorCode == RESULT_OK) return; if (mhz.errorCode == RESULT_OK) return;
while (1) { while (1) {
delay(1000); delay(1000);
@ -236,6 +285,26 @@ void check_sensor() {
if (mhz.errorCode == RESULT_OK) return; if (mhz.errorCode == RESULT_OK) return;
display_big("sensorfout", TFT_RED); display_big("sensorfout", TFT_RED);
} }
*/
}
int get_co2() {
const uint8_t command[9] = { 0xff, 0x01, 0xc5, 0, 0, 0, 0, 0, 0x3a };
hwserial1.write(command, sizeof(command));
delay(50);
char response[9];
if (hwserial1.available()) {
while (hwserial1.available()) {
int c = hwserial1.readBytes(response, sizeof(response));
if (c != sizeof(response)) return 0;
}
}
uint8_t checksum = 255;
for (int i = 0; i < sizeof(response) - 1; i++) {
checksum -= response[i];
}
if (response[8] != checksum) return 0;
return response[2] * 256 + response[3];
} }
void loop() { void loop() {
@ -244,17 +313,12 @@ void loop() {
if (mqtt_enabled) mqtt.loop(); if (mqtt_enabled) mqtt.loop();
int CO2 = mhz.getCO2(); int CO2 = get_co2();
int unclamped = mhz.getCO2(false);
// reimplement filter from library, but also checking for 436 because our
// sensors (firmware 0436, coincidence?) return that instead of 410...
if (unclamped == co2_init && CO2 - unclamped >= 10) CO2 = 0;
// No known sensors support >10k PPM (library filter tests for >32767) // No known sensors support >10k PPM (library filter tests for >32767)
if (CO2 > 10000 || unclamped > 10000) CO2 = 0; // if (CO2 > 10000 || unclamped > 10000) CO2 = 0;
check_sensor(); // check_sensor();
Serial.println(CO2); Serial.println(CO2);