esp32-sensornode/main/esp32-sensornode_main.cpp

313 lines
9.3 KiB
C++

/*
* ESP32 Environmental Sensor Node with SI7021 (Temp + Hum)
* (to be build with custom compiled ESP-IDF)
*
* copyright: Jannik Beyerstedt | https://jannikbeyerstedt.de | code@jannikbeyerstedt.de
* license: http://www.gnu.org/licenses/gpl-3.0.txt GPLv3 License
*/
#include "Arduino.h"
#include "si7021.hpp"
#include <driver/adc.h>
#include <WiFi.h>
#define BOARD_HUZZAH 1 /* Adafruit Feather HUZZAH */
#define BOARD_LOLIN 2 /* LoLin NodeMCU */
#define BOARD_ESP07S 3 /* standalone ESP07S */
#define BOARD_ESP32 4 /* standalone ESP32 */
/* DEBUG SETTINGS */
#define TEST /* use test config and database */
#define PRINT_INFO /* enable Serial output */
// #define PRINT_DEBUG /* enable additional debug output */
/* CONFIGURATION OPTIONS */
#ifndef NODENAME
#define NODENAME "env-TODO" /* IMPORTANT: CHANGE FOR EACH DEVICE */
#endif
#ifndef BOARD
#define BOARD 4 /* IMPORTANT: select one of the BOARD_* types */
#endif
#define DB_HOSTNAME "ursaminor.fra80"
#define DB_PASSWD "c2Vuc29yczpTZW5zb3JzLXcuaW5mbHV4QGhvbWU" // BasicAuth String
#if BOARD == BOARD_ESP32
#define BATT_FULL 3800 // 4.3V Battery
#define BATT_CUTOFF 2500 // 2.8V Battery
#else
#error "unsupported board chosen"
#endif
String loggerId = "esp32-"; // prefix for the last 3 octets of the MAC address
/* SETTINGS */
float tempOffset = +0.0;
float humiOffset = +0.0;
const char* host = DB_HOSTNAME;
const int httpPort = 8086;
const char* wlan_ssid = "WLAN-Bey-IoT";
const char* wlan_passwd = "IoT-Fra80";
#ifndef TEST
String loggerName = NODENAME;
const uint16_t sendInterval_sec = 1800; /* 1800 sec (30 min) */
const uint8_t sampleAvgNum = 6; /* 6 (every 5 minutes) */
const uint16_t sampleInterval_sec = sendInterval_sec / sampleAvgNum;
String serviceUri = "/write?db=sensors";
#else
String loggerName = "esp-test";
const uint16_t sendInterval_sec = 180; /* 180 sec (3 min) */
const uint8_t sampleAvgNum = 6; /* 3 (every 1 minute) */
const uint16_t sampleInterval_sec = sendInterval_sec / sampleAvgNum;
String serviceUri = "/write?db=test";
#endif
/* GLOBAL VARIABLES */
const uint16_t wlanConnectCheckInterval = 250; // milli seconds: poll wifi.state after wifi.begin()
const uint16_t wlanConnectTimeout = 15000; // milli seconds
RTC_DATA_ATTR uint8_t wlanConnectFailCnt = 0;
Si7021 si7021 = Si7021();
float temp = 0.0;
float humi = 0.0;
uint16_t battLevel = 0;
float battPerc = 0.0;
RTC_DATA_ATTR uint8_t sampleCnt = 0; // for average value
RTC_DATA_ATTR float tempAccu = 0.0; // for average value
RTC_DATA_ATTR float humiAccu = 0.0; // for average value
uint8_t chipid[6] = {0}; // WiFi MAC address
#ifdef PRINT_INFO
#define INFO_PRINT(x) Serial.print(x)
#define INFO_PRINTLN(x) Serial.println(x)
#else
#define INFO_PRINT(x)
#define INFO_PRINTLN(x)
#endif
#if defined(PRINT_INFO) && defined(PRINT_DEBUG)
#define DEBUG_PRINT(x) Serial.print(x)
#define DEBUG_PRINTLN(x) Serial.println(x)
#else
#define DEBUG_PRINT(x)
#define DEBUG_PRINTLN(x)
#endif
/* GLOBAL FUNCTIONS */
bool wlanConnect(void) {
unsigned int cycles = 0;
INFO_PRINT("[INFO ] Connecting to WiFi");
WiFi.mode(WIFI_STA);
WiFi.begin(wlan_ssid, wlan_passwd);
while (WiFi.status() != WL_CONNECTED) {
delay(wlanConnectCheckInterval);
INFO_PRINT(".");
cycles++;
if (cycles > wlanConnectTimeout / wlanConnectCheckInterval) {
INFO_PRINTLN(" FAILED");
return false;
}
}
INFO_PRINT(" ok, IP: ");
INFO_PRINTLN(WiFi.localIP());
return true;
}
void doDeepSleep(uint16_t durationSec) {
esp_sleep_enable_timer_wakeup(durationSec * 1000000);
// esp_deep_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_OFF); // TODO more fine grained settings
#ifdef PRINT_DEBUG
Serial.printf("[DEBUG] Going to deep sleep for %d seconds\n", durationSec);
#endif
#ifdef PRINT_INFO
delay(100); // time to send the messages via Serial
#endif
esp_deep_sleep_start();
}
void printWakeupReason() {
esp_sleep_wakeup_cause_t wakeup_reason;
wakeup_reason = esp_sleep_get_wakeup_cause();
switch (wakeup_reason) {
case 1:
DEBUG_PRINTLN("[DEBUG] Wakeup caused by external signal using RTC_IO");
break;
case 2:
DEBUG_PRINTLN("[DEBUG] Wakeup caused by external signal using RTC_CNTL");
break;
case 3:
DEBUG_PRINTLN("[DEBUG] Wakeup caused by timer");
break;
case 4:
DEBUG_PRINTLN("[DEBUG] Wakeup caused by touchpad");
break;
case 5:
DEBUG_PRINTLN("[DEBUG] Wakeup caused by ULP program");
break;
default:
DEBUG_PRINTLN("[DEBUG] Wakeup was not caused by deep sleep");
break;
}
}
extern "C" void app_main() {
// ESP32 Setup
initArduino();
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);
// set logger node unique ID with MAC address
char macIdString[6] = {0};
esp_efuse_mac_get_default(chipid);
sprintf(macIdString, "%02x%02x%02x", chipid[3], chipid[4], chipid[5]);
loggerId += macIdString;
#ifdef PRINT_INFO
Serial.begin(115200);
delay(100);
Serial.println("");
Serial.print("[INFO ] Type ");
Serial.print(BOARD);
Serial.print(", Node: ");
Serial.print(loggerId);
Serial.print(" (");
Serial.print(loggerName);
Serial.print("), Build: ");
Serial.println(PROJ_VER);
#endif
#ifdef PRINT_DEBUG
printWakeupReason();
#endif
// setup the si7021 sensor
if (false == si7021.begin()) {
INFO_PRINTLN("[ERROR] SI7021 not set up properly");
}
// setup the adc for VCC measurement
adc1_config_width(ADC_WIDTH_12Bit);
adc1_config_channel_atten(ADC1_CHANNEL_0, ADC_ATTEN_0db); // or ADC_ATTEN_2_5db
/* GET VALUE SAMPLES */
// measure environmental data from si7021
if (false == si7021.measure()) {
INFO_PRINT("[ERROR] SI7021 measurement failed");
}
humi = si7021.humidity + humiOffset;
temp = si7021.temperature + tempOffset;
// measure battery level
battLevel = adc1_get_raw(ADC1_CHANNEL_0); // ADC0 = GPIO36 = VP = pin 4 (after en)
battPerc = (0 == battLevel) ? 0 : 100.0 * (battLevel - BATT_CUTOFF) / (BATT_FULL - BATT_CUTOFF);
#ifdef PRINT_INFO
Serial.printf("[INFO ] > Humidity: %5.2f Temperature: %5.2f", humi, temp);
Serial.printf(" Battery Bat: %5.1f/100 (raw: %4d)\n", battPerc, battLevel);
#endif
/* ---------- MAIN LOGIC START ---------- */
// accumulate and average $sampleAvgNum samples before sending data
sampleCnt++;
tempAccu += temp;
humiAccu += humi;
// calculate average and send data, if $sampleAvgNum are reached
if (sampleCnt >= sampleAvgNum) {
INFO_PRINTLN("[INFO ] Enough samples collected -> send average to database");
temp = tempAccu / (float)sampleCnt;
humi = humiAccu / (float)sampleCnt;
#ifdef PRINT_INFO
Serial.printf("[INFO ] < Humidity: %5.2f Temperature: %5.2f\n", humi, temp);
#endif
// turn wifi on again
DEBUG_PRINTLN("[DEBUG] Turning wifi on again and connecting");
if (wlanConnect()) {
// send data to influxdb
String influxDataLine = "weather,id=" + loggerId + ",sensor=" + loggerName + " temp=" + String(temp, 2);
influxDataLine += ",hum=" + String(humi, 2);
influxDataLine += ",batRaw=" + String(battLevel);
influxDataLine += ",bat=" + String(battPerc);
INFO_PRINT("[INFO ] Connecting to ");
INFO_PRINT(host);
WiFiClient client;
if (client.connect(host, httpPort)) {
INFO_PRINTLN(" > success");
String httpRequest = "POST " + serviceUri + " HTTP/1.1\r\n" + "Host: " + host + ":" + httpPort +
"\r\n" + "Content-Length: " + influxDataLine.length() + "\r\n" +
"Authorization: Basic " + DB_PASSWD + "=\r\n" + "Connection: close\r\n" +
"\r\n" + influxDataLine + "\r\n";
client.print(httpRequest);
delay(100);
while (client.available()) {
String line = client.readStringUntil('\n');
if (line.indexOf("HTTP") != -1) {
if (line.indexOf("204") == -1) { // expect a HTTP 204 status code
INFO_PRINTLN("[ERROR]: invalid http status code");
INFO_PRINTLN(line);
} else { // successful database submission
// reset average after successful database submission
sampleCnt = 0;
tempAccu = 0;
humiAccu = 0;
wlanConnectFailCnt = 0;
}
break;
} else {
;
}
}
} else {
INFO_PRINTLN(" > FAILED");
}
client.stop();
WiFi.disconnect(true);
// continue with deep sleep at end of main function
} else { // ELSE: !wlanConnect
/* WIFI CONNECT FAILED, WAIT MAX 5 MINUTES IN DEEP SLEEP */
wlanConnectFailCnt++;
#ifdef PRINT_INFO
Serial.printf("[INFO ] WiFi connect failed %d time(s) -> wait %03d s and try again\n",
wlanConnectFailCnt, sampleInterval_sec);
#endif
if (sampleInterval_sec > (5 * 60)) {
doDeepSleep(5 * 60);
} else {
doDeepSleep(sampleInterval_sec);
}
} // ENDIF: wlanConnect
} else { // ELSE: sampleCnt < sampleAvgNum
#ifdef PRINT_INFO
Serial.printf("[INFO ] %d of %d samples collected -> sleep %4d s\n", sampleCnt, sampleAvgNum,
sampleInterval_sec);
// continue with deep sleep at end of main function
#endif
} // ENDIF: sampleCnt
/* ---------- MAIN LOGIC END ---------- */
/* SAVE ENERGY BY WAITING IN DEEP SLEEP */
doDeepSleep(sampleInterval_sec);
}