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.