Created
August 27, 2020 13:41
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A sketch for reading soil moisture levels and using Deep Sleep to preserve battery life on DIY More ESP32 soil boards
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| #include "DHT.h" | |
| #include "esp_wifi.h" | |
| #include <WiFi.h> | |
| #include <ArduinoJson.h> | |
| #include <HTTPClient.h> | |
| //move to secrets | |
| const char * networkName = "XXX"; | |
| const char * networkPswd = "XXX"; | |
| String AIOKey = "XXX"; | |
| const int led = LED_BUILTIN; | |
| RTC_DATA_ATTR int bootCount = 0; | |
| //for deep sleep | |
| #define uS_TO_S_FACTOR 1000000 /* Conversion factor for micro seconds to seconds */ | |
| #define TIME_TO_SLEEP 6000 // not sure why this is coming out wrong | |
| uint64_t sleepus=0; | |
| #define DHTPIN 22 | |
| #define DHTTYPE DHT11 | |
| DHT dht(DHTPIN, DHTTYPE); | |
| //Other things | |
| float asoilmoist=0.0; | |
| float hum, temp; | |
| void print_wakeup_reason(){ | |
| esp_sleep_wakeup_cause_t wakeup_reason; | |
| wakeup_reason = esp_sleep_get_wakeup_cause(); | |
| switch(wakeup_reason) | |
| { | |
| case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break; | |
| case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break; | |
| case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break; | |
| case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break; | |
| case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break; | |
| default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break; | |
| } | |
| } | |
| int connectToWiFi(const char * ssid, const char * pwd) | |
| { | |
| #ifdef debug | |
| Serial.println("Connecting to WiFi network: " + String(ssid)); | |
| #endif | |
| WiFi.begin(ssid, pwd); | |
| int counter = 0; | |
| while (WiFi.status() != WL_CONNECTED) | |
| { | |
| delay(500); | |
| #ifdef debug | |
| Serial.print("."); | |
| #endif | |
| counter++; | |
| if (counter > 120) { return 2;} // try to connect to the network for one minute. | |
| } | |
| #ifdef debug | |
| Serial.println(); | |
| Serial.println("WiFi connected!"); | |
| Serial.print("IP address: "); | |
| Serial.println(WiFi.localIP()); | |
| #endif | |
| return 0; | |
| } | |
| void post_data() { | |
| if (connectToWiFi(networkName, networkPswd) == 2) {WiFi.mode(WIFI_OFF); return; } //end the function if can't connect to wifi | |
| HTTPClient http; | |
| //post the humidity | |
| String aio_url = "http://io.adafruit.com/api/v2/ben_ev/feeds/soilmoisture/data"; | |
| http.begin(aio_url); | |
| http.addHeader("X-AIO-Key", AIOKey); | |
| http.addHeader("Content-Type", "application/json"); | |
| int httpResponseCode = http.POST("{\"value\":\"" + String(asoilmoist) +"\"}"); | |
| aio_url = "http://io.adafruit.com/api/v2/ben_ev/feeds/gardentemp/data"; | |
| http.begin(aio_url); | |
| http.addHeader("X-AIO-Key", AIOKey); | |
| http.addHeader("Content-Type", "application/json"); | |
| httpResponseCode = http.POST("{\"value\":\"" + String(temp) +"\"}"); | |
| aio_url = "http://io.adafruit.com/api/v2/ben_ev/feeds/gardenhumid/data"; | |
| http.begin(aio_url); | |
| http.addHeader("X-AIO-Key", AIOKey); | |
| http.addHeader("Content-Type", "application/json"); | |
| httpResponseCode = http.POST("{\"value\":\"" + String(hum) +"\"}"); | |
| // Free resources | |
| http.end(); | |
| WiFi.mode(WIFI_OFF); | |
| return; | |
| } | |
| void setup(void) { | |
| //put this right at the start of setup to minimise wasted power | |
| ++bootCount; | |
| sleepus = TIME_TO_SLEEP * uS_TO_S_FACTOR; | |
| esp_sleep_enable_timer_wakeup(sleepus); | |
| if(bootCount !=6) { esp_deep_sleep_start(); } | |
| bootCount=0; // this will only run on the 3rd boot. | |
| pinMode(led, OUTPUT); | |
| digitalWrite(led, 0); | |
| Serial.begin(115200); | |
| Serial.println(""); | |
| Serial.print("boot count: "); | |
| Serial.println(bootCount); | |
| dht.begin(); | |
| //delay for two minutes on boot to allow upload of a new sketch | |
| print_wakeup_reason(); | |
| delay(2000); | |
| } | |
| void loop(void) { | |
| asoilmoist=analogRead(32);//exponential smoothing of soil moisture | |
| Serial.print("Moisture: "); | |
| Serial.println(asoilmoist); | |
| // Reading temperature or humidity takes about 250 milliseconds! | |
| // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) | |
| hum = dht.readHumidity(); | |
| Serial.print("humidity: "); | |
| Serial.println(hum); | |
| // Read temperature as Celsius (the default) | |
| temp = dht.readTemperature(); | |
| Serial.print("Temperature: "); | |
| Serial.println(temp); | |
| post_data(); | |
| Serial.flush(); | |
| delay(2000); | |
| esp_deep_sleep_start(); | |
| } |
Change this line:
#define TIME_TO_SLEEP 6000 // not sure why this is coming out wrong
To:
#define TIME_TO_SLEEP 6000ULL // not sure why this is coming out wrong
The numbers need to be uint64_t. You might need this as well:
#define uS_TO_S_FACTOR 1000000ULL
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I think the reason why you have difficulty with longer sleep times is that your constants default to 32-bit (u)integers, if I understand correctly. Maybe you should try using the ULL suffix to request the compiler to treat them as 64-bit uints? For instance, #define TIME_TO_SLEEP 6000ULL.
Hope this helps!