DHT plus two relays

[Newzwaver]

HI Everyone,

I have my temp/hum sensor in my AV cab and what two computer fans to cool it down. I have tried this and it originally worked with one relay and I got creative and screwed it up. When i tried to get it back to the original version i couldn't as I yes saved over it. I have checked on the forum and see projects like this but they don't appear to work. Can should one give a few pointers?

#define MY_DEBUG
#define MY_RADIO_NRF24
#define MY_REPEATER_FEATURE
#define MY_NODE_ID 29

#include <MyConfig.h>
#include <MySensors.h>
#include <SPI.h>
#include <DHT.h>


#define DHT_DATA_PIN 3
#define RELAY_1  4 
#define CHILD_ID_HUM 28
#define CHILD_ID_TEMP 29
#define NUMBER_OF_RELAYS 1
#define RELAY_ON 1 
#define RELAY_OFF 0
#define SENSOR_TEMP_OFFSET 0

static const uint64_t UPDATE_INTERVAL = 40000;
static const uint8_t FORCE_UPDATE_N_READS = 10;

float lastTemp;
float lastHum;
uint8_t nNoUpdatesTemp;
uint8_t nNoUpdatesHum;
bool metric = true;

MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
DHT dht;

void before()
{
for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
pinMode(pin, OUTPUT);
digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
}
}

void presentation()
{
sendSketchInfo("TempHumRelay", "1.2");
  present(CHILD_ID_HUM, S_HUM);
  present(CHILD_ID_TEMP, S_TEMP);
  metric = getControllerConfig().isMetric;
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
  present(sensor, S_BINARY);
}
}

void setup()
{
 dht.setup(DHT_DATA_PIN); // set data pin of DHT sensor
  if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
    Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
  }
    sleep(dht.getMinimumSamplingPeriod());
}
void loop()
{
   dht.readSensor(true);
  float temperature = dht.getTemperature();
  if (isnan(temperature)) {
    Serial.println("Failed reading temperature from DHT!");
  } else if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS) {
    lastTemp = temperature;
    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    nNoUpdatesTemp = 0;
    temperature += SENSOR_TEMP_OFFSET;
    send(msgTemp.set(temperature, 1));

    #ifdef MY_DEBUG
    Serial.print("T: ");
    Serial.println(temperature);
    #endif
  } else {
    nNoUpdatesTemp++;
  }
  float humidity = dht.getHumidity();
  if (isnan(humidity)) {
    Serial.println("Failed reading humidity from DHT");
  } else if (humidity != lastHum || nNoUpdatesHum == FORCE_UPDATE_N_READS) {
    lastHum = humidity;
    nNoUpdatesHum = 0;
    send(msgHum.set(humidity, 1));

    #ifdef MY_DEBUG
    Serial.print("H: ");
    Serial.println(humidity);
    #endif
  } else {
    nNoUpdatesHum++;
  }
  sleep(UPDATE_INTERVAL); 
}
void receive(const MyMessage &message)
{
  if (message.type==V_STATUS) {
    digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
    saveState(message.sensor, message.getBool());
    Serial.print("Incoming change for sensor:");
    Serial.print(message.sensor);
    Serial.print(", New status: ");
    Serial.println(message.getBool());
  }  }

[mfalkvidd]

@Newzwaver in what way doesn't it work? It would be easier to help you if we knew what to look for :-)

My best guess so far is that the node goes to sleep, which means it can not receive changes to the relays.

[dbemowsk]

I am only speculating, but I think that he is missing the MySensors part of things. It sounds like he wants to run two relays with a temp/hum sensor and that's it. So he tries a MySensors sketch and without a gateway to respond, the sketch just hangs waiting for a gateway to connect to. Again, I could be wrong.

[Newzwaver]

This works whether its correct or not it is working again.
// Enable debug prints to serial monitor
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_NRF24
#define MY_NODE_ID 31
// Enable repeater functionality for this node
#define MY_REPEATER_FEATURE

#include <MyConfig.h>
#include <MySensors.h>
#include <SPI.h>
#include <DHT.h>

#define DHT_DATA_PIN 3
#define RELAY_1 4 // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define CHILD_ID_HUM 28
#define CHILD_ID_TEMP 27
#define NUMBER_OF_RELAYS 2 // Total number of attached relays
#define RELAY_ON 1 // GPIO value to write to turn on attached relay
#define RELAY_OFF 0 // GPIO value to write to turn off attached relay

// Set this offset if the sensor has a permanent small offset to the real temperatures
#define SENSOR_TEMP_OFFSET 0

// Sleep time between sensor updates (in milliseconds)
// Must be >1000ms for DHT22 and >2000ms for DHT11
static const uint64_t UPDATE_INTERVAL = 10000;

// Force sending an update of the temperature after n sensor reads, so a controller showing the
// timestamp of the last update doesn't show something like 3 hours in the unlikely case, that
// the value didn't change since;
// i.e. the sensor would force sending an update every UPDATE_INTERVAL*FORCE_UPDATE_N_READS [ms]
static const uint8_t FORCE_UPDATE_N_READS = 10;

float lastTemp;
float lastHum;
uint8_t nNoUpdatesTemp;
uint8_t nNoUpdatesHum;
bool metric = true;

MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
DHT dht;

void before()
{
for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
// Then set relay pins in output mode
pinMode(pin, OUTPUT);
// Set relay to last known state (using eeprom storage)
digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
}
}

void presentation()
{
// Send the sketch version information to the gateway and Controller
sendSketchInfo("TempHum2Relay", "1.1B");
// Register all sensors to gw (they will be created as child devices)
present(CHILD_ID_HUM, S_HUM);
present(CHILD_ID_TEMP, S_TEMP);
metric = getControllerConfig().isMetric;
for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
// Register all sensors to gw (they will be created as child devices)
present(sensor, S_BINARY);
}
}

void setup()
{
dht.setup(DHT_DATA_PIN); // set data pin of DHT sensor
if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
}
// Sleep for the time of the minimum sampling period to give the sensor time to power up
// (otherwise, timeout errors might occure for the first reading)
sleep(dht.getMinimumSamplingPeriod());
}
void loop()
{
// Force reading sensor, so it works also after sleep()
dht.readSensor(true);

// Get temperature from DHT library
float temperature = dht.getTemperature();
if (isnan(temperature)) {
Serial.println("Failed reading temperature from DHT!");
} else if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS) {
// Only send temperature if it changed since the last measurement or if we didn't send an update for n times
lastTemp = temperature;
if (!metric) {
temperature = dht.toFahrenheit(temperature);
}
// Reset no updates counter
nNoUpdatesTemp = 0;
temperature += SENSOR_TEMP_OFFSET;
send(msgTemp.set(temperature, 1));

#ifdef MY_DEBUG
Serial.print("T: ");
Serial.println(temperature);
#endif
} else {
// Increase no update counter if the temperature stayed the same
nNoUpdatesTemp++;
}

// Get humidity from DHT library
float humidity = dht.getHumidity();
if (isnan(humidity)) {
Serial.println("Failed reading humidity from DHT");
} else if (humidity != lastHum || nNoUpdatesHum == FORCE_UPDATE_N_READS) {
// Only send humidity if it changed since the last measurement or if we didn't send an update for n times
lastHum = humidity;
// Reset no updates counter
nNoUpdatesHum = 0;
send(msgHum.set(humidity, 1));

#ifdef MY_DEBUG
Serial.print("H: ");
Serial.println(humidity);
#endif

} else {
// Increase no update counter if the humidity stayed the same
nNoUpdatesHum++;
}

// Sleep for a while to save energy
sleep(UPDATE_INTERVAL);
}

void receive(const MyMessage &message)
{
// We only expect one type of message from controller. But we better check anyway.
if (message.type==V_STATUS) {
// Change relay state
digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
// Store state in eeprom
saveState(message.sensor, message.getBool());
// Write some debug info
Serial.print("Incoming change for sensor:");
Serial.print(message.sensor);
Serial.print(", New status: ");
Serial.println(message.getBool());

} }

[dbemowsk]

@Newzwaver When you post code, it helps out a lot if you use the code tag button </> before pasting in your code.

The other alternative which is basically what the code tag button does is to put 3 tick marks ( ``` ) before and after your code.

It keeps the code indented and makes it MUCH easier to read.