Multisensor PIR problem [solved]
-
" delay(dht.getMinimumSamplingPeriod());" is the problem - it delays whole sketch every run of loop()
@andriej hey,
the PIR works perfect now, but the DHT didnt update... Only the first startup of the arduino works:
---------- Battery: 100
---------- PIR: 1
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:1
send: 10-10-0-0 s=3,c=1,t=0,pt=7,l=5,st=ok:20.5
---------- Temp: 20.50
send: 10-10-0-0 s=2,c=1,t=1,pt=7,l=5,st=ok:34.6
---------- Humidity: 34.60
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:87
---------- Light: 87
---------- Battery: 100
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:0
---------- Battery: 100
---------- PIR: 1
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:1
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:84
---------- Light: 84
---------- Battery: 100
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:0
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:88
---------- Light: 88
---------- Battery: 100
---------- PIR: 1
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:1
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:83
---------- Light: 83
---------- Battery: 100
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:0
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:87
---------- Light: 87
---------- Battery: 100
---------- PIR: 1 -
@andriej hey,
the PIR works perfect now, but the DHT didnt update... Only the first startup of the arduino works:
---------- Battery: 100
---------- PIR: 1
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:1
send: 10-10-0-0 s=3,c=1,t=0,pt=7,l=5,st=ok:20.5
---------- Temp: 20.50
send: 10-10-0-0 s=2,c=1,t=1,pt=7,l=5,st=ok:34.6
---------- Humidity: 34.60
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:87
---------- Light: 87
---------- Battery: 100
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:0
---------- Battery: 100
---------- PIR: 1
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:1
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:84
---------- Light: 84
---------- Battery: 100
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:0
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:88
---------- Light: 88
---------- Battery: 100
---------- PIR: 1
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:1
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:83
---------- Light: 83
---------- Battery: 100
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:0
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=ok:87
---------- Light: 87
---------- Battery: 100
---------- PIR: 1@n3ro the DHT needs a delay between polling. You are likely polling it too fast now. Rather than remove the delay command, you need to use a different method to not poll the DHT too frequently. The millis command is one option: http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
Cheers
Al -
Hi ! I had the same problem. Seems like gw.sleep(some_number_of_mills); lets you loose the init of the dht. Just put dht.begin(); in your loop before you read the value and it should work.
example.
void loop ()
{
dht.begin();
float temperature = dht.readTemperature();
...... -
Hi ! I had the same problem. Seems like gw.sleep(some_number_of_mills); lets you loose the init of the dht. Just put dht.begin(); in your loop before you read the value and it should work.
example.
void loop ()
{
dht.begin();
float temperature = dht.readTemperature();
......@torfinn said:
dht.begin();
Hey torfinn,
i get this error when compiling:
MotionSensor_DHT_light_battery_mod.ino: In function 'void loop()':
MotionSensor_DHT_light_battery_mod.ino:109:7: error: 'class DHT' has no member named 'begin'
Fehler beim Kompilieren. -
I have a idea,
is it possible to build a second loop like this?
But now i have one problem... the loop2 never run...#include <MySensor.h> #include <readVcc.h> #include <SPI.h> #include <DHT.h> #include <Scheduler.h> #define NODE_ID 11 // ID of node unsigned long SLEEP_TIME = 600000; // Sleep time between reports (in milliseconds) #define CHILD_ID_PIR 1 // Id of the sensor PIR #define CHILD_ID_HUM 2 // Id of the sensor HUM #define CHILD_ID_TEMP 3 // Id of the sensor TEMP #define CHILD_ID_LIGHT 4 // Id of the sensor LIGHT #define PIR_SENSOR_DIGITAL 3 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define INTERRUPT PIR_SENSOR_DIGITAL-2 // Usually the interrupt = pin -2 (on uno/nano anyway) #define HUMIDITY_SENSOR_DIGITAL_PIN 2 #define LIGHT_SENSOR_ANALOG_PIN 0 MySensor gw; // Initialize Variables MyMessage msgPir(CHILD_ID_PIR, V_TRIPPED); MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); MyMessage msgLight(CHILD_ID_LIGHT, V_LIGHT_LEVEL); DHT dht; float lastTemp; float lastHum; boolean metric = true; int oldBatteryPcnt; int lastLightLevel; unsigned long time; int MIN_V = 2700; // empty voltage (0%) int MAX_V = 3200; // full voltage (100%) void setup() { gw.begin(NULL, NODE_ID, false); //PIR // Send the sketch version information to the gateway and Controller gw.sendSketchInfo("Motion Sensor", "1.0"); pinMode(PIR_SENSOR_DIGITAL, INPUT); // sets the motion sensor digital pin as input digitalWrite(PIR_SENSOR_DIGITAL, HIGH); // Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_PIR, S_MOTION); //DHT dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); // Send the Sketch Version Information to the Gateway gw.sendSketchInfo("Humidity", "1.0"); // Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_HUM, S_HUM); gw.present(CHILD_ID_TEMP, S_TEMP); metric = gw.getConfig().isMetric; //LIGHT // Send the sketch version information to the gateway and Controller gw.sendSketchInfo("Light Sensor", "1.0"); // Register all sensors to gateway (they will be created as child devices) gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL); Scheduler.startLoop(loop2); } void loop() { // Read digital motion value boolean tripped = digitalRead(PIR_SENSOR_DIGITAL) == HIGH; Serial.print("---------- PIR: "); Serial.println(tripped); gw.send(msgPir.set(tripped ? "1" : "0")); // Send tripped value to gw // Sleep until interrupt comes in on motion sensor. Send update every two minute. gw.sleep(INTERRUPT, CHANGE, SLEEP_TIME); } void loop2() { //DHT //dht.begin(); delay(dht.getMinimumSamplingPeriod()); //delay(1000); //millis(dht.getMinimumSamplingPeriod()); //Serial.print(dht.getMinimumSamplingPeriod()); float temperature = dht.getTemperature(); if (isnan(temperature)) { Serial.println("Failed reading temperature from DHT"); } else if (temperature != lastTemp) { lastTemp = temperature; if (!metric) { temperature = dht.toFahrenheit(temperature); } gw.send(msgTemp.set(temperature, 1)); Serial.print("---------- Temp: "); Serial.println(temperature); } float humidity = dht.getHumidity(); if (isnan(humidity)) { Serial.println("Failed reading humidity from DHT"); } else if (humidity != lastHum) { lastHum = humidity; gw.send(msgHum.set(humidity, 1)); Serial.print("---------- Humidity: "); Serial.println(humidity); } // Light int lightLevel = (1023 - analogRead(LIGHT_SENSOR_ANALOG_PIN)) / 10.23; //Serial.println(lightLevel); if (lightLevel != lastLightLevel) { gw.send(msgLight.set(lightLevel)); lastLightLevel = lightLevel; Serial.print("---------- Light: "); Serial.println(lightLevel); } // Measure battery float batteryV = readVcc(); int batteryPcnt = (((batteryV - MIN_V) / (MAX_V - MIN_V)) * 100 ); if (batteryPcnt > 100) { batteryPcnt = 100; } if (batteryPcnt != oldBatteryPcnt) { gw.sendBatteryLevel(batteryPcnt); // Send battery percentage oldBatteryPcnt = batteryPcnt; } Serial.print("---------- Battery: "); Serial.println(batteryPcnt); gw.sleep(SLEEP_TIME); }i have downloaded THIS
But i get this error when compiling:
In file included from MotionSensor_DHT_light_battery_mod.ino:6:0:
Arduino\libraries\Scheduler/Scheduler.h:33:22: fatal error: WProgram.h: No such file or directory
#include <WProgram.h> -
@n3ro , you can have only one loop().
You need to merge the two logics into into a single loop. You might also want to remove the second sleep, otherwise PIR will not trigger there.
@rvendrame do you have an idea how to do it?
-
Maybe you can start by to removing these 3 lines:
} void loop2() {... and move the 1st sleep to the end of loop (where the 2nd sleep is):
// Sleep until interrupt comes in on motion sensor. Send update every two minute. gw.sleep(INTERRUPT, CHANGE, SLEEP_TIME);.... and remove the 2nd sleep:
gw.sleep(SLEEP_TIME); -
Maybe you can start by to removing these 3 lines:
} void loop2() {... and move the 1st sleep to the end of loop (where the 2nd sleep is):
// Sleep until interrupt comes in on motion sensor. Send update every two minute. gw.sleep(INTERRUPT, CHANGE, SLEEP_TIME);.... and remove the 2nd sleep:
gw.sleep(SLEEP_TIME);@rvendrame
if i use this:#include <MySensor.h> #include <readVcc.h> #include <SPI.h> #include <DHT.h> #define NODE_ID 10 // ID of node unsigned long SLEEP_TIME = 600000; // Sleep time between reports (in milliseconds) #define CHILD_ID_PIR 1 // Id of the sensor PIR #define CHILD_ID_HUM 2 // Id of the sensor HUM #define CHILD_ID_TEMP 3 // Id of the sensor TEMP #define CHILD_ID_LIGHT 4 // Id of the sensor LIGHT #define PIR_SENSOR_DIGITAL 3 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define INTERRUPT PIR_SENSOR_DIGITAL-2 // Usually the interrupt = pin -2 (on uno/nano anyway) #define HUMIDITY_SENSOR_DIGITAL_PIN 2 #define LIGHT_SENSOR_ANALOG_PIN 0 MySensor gw; // Initialize Variables MyMessage msgPir(CHILD_ID_PIR, V_TRIPPED); MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); MyMessage msgLight(CHILD_ID_LIGHT, V_LIGHT_LEVEL); DHT dht; float lastTemp; float lastHum; boolean metric = true; int oldBatteryPcnt; int lastLightLevel; int MIN_V = 2700; // empty voltage (0%) int MAX_V = 3200; // full voltage (100%) void setup() { gw.begin(NULL, NODE_ID, false); //PIR // Send the sketch version information to the gateway and Controller gw.sendSketchInfo("Motion Sensor", "1.0"); pinMode(PIR_SENSOR_DIGITAL, INPUT); // sets the motion sensor digital pin as input digitalWrite(PIR_SENSOR_DIGITAL, HIGH); // Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_PIR, S_MOTION); //DHT dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); // Send the Sketch Version Information to the Gateway gw.sendSketchInfo("Humidity", "1.0"); // Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_HUM, S_HUM); gw.present(CHILD_ID_TEMP, S_TEMP); metric = gw.getConfig().isMetric; //LIGHT // Send the sketch version information to the gateway and Controller gw.sendSketchInfo("Light Sensor", "1.0"); // Register all sensors to gateway (they will be created as child devices) gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL); } void loop() { // Measure battery float batteryV = readVcc(); int batteryPcnt = (((batteryV - MIN_V) / (MAX_V - MIN_V)) * 100 ); if (batteryPcnt > 100) { batteryPcnt = 100; } if (batteryPcnt != oldBatteryPcnt) { gw.sendBatteryLevel(batteryPcnt); // Send battery percentage oldBatteryPcnt = batteryPcnt; } Serial.print("---------- Battery: "); Serial.println(batteryPcnt); // Read digital motion value boolean tripped = digitalRead(PIR_SENSOR_DIGITAL) == HIGH; Serial.print("---------- PIR: "); Serial.println(tripped); gw.send(msgPir.set(tripped ? "1" : "0")); // Send tripped value to gw //DHT //delay(dht.getMinimumSamplingPeriod()); float temperature = dht.getTemperature(); if (isnan(temperature)) { Serial.println("Failed reading temperature from DHT"); } else if (temperature != lastTemp) { lastTemp = temperature; if (!metric) { temperature = dht.toFahrenheit(temperature); } gw.send(msgTemp.set(temperature, 1)); Serial.print("---------- Temp: "); Serial.println(temperature); } float humidity = dht.getHumidity(); if (isnan(humidity)) { Serial.println("Failed reading humidity from DHT"); } else if (humidity != lastHum) { lastHum = humidity; gw.send(msgHum.set(humidity, 1)); Serial.print("---------- Humidity: "); Serial.println(humidity); } // Light int lightLevel = (1023 - analogRead(LIGHT_SENSOR_ANALOG_PIN)) / 10.23; //Serial.println(lightLevel); if (lightLevel != lastLightLevel) { gw.send(msgLight.set(lightLevel)); lastLightLevel = lightLevel; Serial.print("---------- Light: "); Serial.println(lightLevel); } // Sleep until interrupt comes in on motion sensor. Send update every two minute. gw.sleep(INTERRUPT, CHANGE, SLEEP_TIME); }the pir works fine. but the dht doesn't work.
when delay(dht.getMinimumSamplingPeriod()); is used the dht works and the pir fails.
-
It makes sense ;-) Try this:
create (outside the loop) a variable to count the time:
long mytime = 0;.. and replace the delay by :
if ( milis() > mytime ) { < Put the dht stuff here > mytime = millis() + dht.getMinimumSamplingPeriod() ; } -
It makes sense ;-) Try this:
create (outside the loop) a variable to count the time:
long mytime = 0;.. and replace the delay by :
if ( milis() > mytime ) { < Put the dht stuff here > mytime = millis() + dht.getMinimumSamplingPeriod() ; }hmm :)
if is use this:#include <MySensor.h> #include <readVcc.h> #include <SPI.h> #include <DHT.h> #define NODE_ID 10 // ID of node unsigned long SLEEP_TIME = 10000; // Sleep time between reports (in milliseconds) #define CHILD_ID_PIR 1 // Id of the sensor PIR #define CHILD_ID_HUM 2 // Id of the sensor HUM #define CHILD_ID_TEMP 3 // Id of the sensor TEMP #define CHILD_ID_LIGHT 4 // Id of the sensor LIGHT #define PIR_SENSOR_DIGITAL 3 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define INTERRUPT PIR_SENSOR_DIGITAL-2 // Usually the interrupt = pin -2 (on uno/nano anyway) #define HUMIDITY_SENSOR_DIGITAL_PIN 2 #define LIGHT_SENSOR_ANALOG_PIN 0 MySensor gw; // Initialize Variables MyMessage msgPir(CHILD_ID_PIR, V_TRIPPED); MyMessage msgHum(CHILD_ID_HUM, V_HUM); MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP); MyMessage msgLight(CHILD_ID_LIGHT, V_LIGHT_LEVEL); DHT dht; float lastTemp; float lastHum; boolean metric = true; int oldBatteryPcnt; int lastLightLevel; long mytime = 0; int MIN_V = 2700; // empty voltage (0%) int MAX_V = 3200; // full voltage (100%) void setup() { gw.begin(NULL, NODE_ID, false); //PIR // Send the sketch version information to the gateway and Controller gw.sendSketchInfo("Motion Sensor", "1.0"); pinMode(PIR_SENSOR_DIGITAL, INPUT); // sets the motion sensor digital pin as input digitalWrite(PIR_SENSOR_DIGITAL, HIGH); // Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_PIR, S_MOTION); //DHT dht.setup(HUMIDITY_SENSOR_DIGITAL_PIN); // Send the Sketch Version Information to the Gateway gw.sendSketchInfo("Humidity", "1.0"); // Register all sensors to gw (they will be created as child devices) gw.present(CHILD_ID_HUM, S_HUM); gw.present(CHILD_ID_TEMP, S_TEMP); metric = gw.getConfig().isMetric; //LIGHT // Send the sketch version information to the gateway and Controller gw.sendSketchInfo("Light Sensor", "1.0"); // Register all sensors to gateway (they will be created as child devices) gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL); } void loop() { // Read digital motion value boolean tripped = digitalRead(PIR_SENSOR_DIGITAL) == HIGH; Serial.print("---------- PIR: "); Serial.println(tripped); gw.send(msgPir.set(tripped ? "1" : "0")); // Send tripped value to gw if ( millis() > mytime ) { //DHT delay(dht.getMinimumSamplingPeriod()); float temperature = dht.getTemperature(); if (isnan(temperature)) { Serial.println("Failed reading temperature from DHT"); } else if (temperature != lastTemp) { lastTemp = temperature; if (!metric) { temperature = dht.toFahrenheit(temperature); } gw.send(msgTemp.set(temperature, 1)); Serial.print("---------- Temp: "); Serial.println(temperature); } float humidity = dht.getHumidity(); if (isnan(humidity)) { Serial.println("Failed reading humidity from DHT"); } else if (humidity != lastHum) { lastHum = humidity; gw.send(msgHum.set(humidity, 1)); Serial.print("---------- Humidity: "); Serial.println(humidity); } // Light int lightLevel = (1023 - analogRead(LIGHT_SENSOR_ANALOG_PIN)) / 10.23; //Serial.println(lightLevel); if (lightLevel != lastLightLevel) { gw.send(msgLight.set(lightLevel)); lastLightLevel = lightLevel; Serial.print("---------- Light: "); Serial.println(lightLevel); } // Measure battery float batteryV = readVcc(); int batteryPcnt = (((batteryV - MIN_V) / (MAX_V - MIN_V)) * 100 ); if (batteryPcnt > 100) { batteryPcnt = 100; } if (batteryPcnt != oldBatteryPcnt) { gw.sendBatteryLevel(batteryPcnt); // Send battery percentage oldBatteryPcnt = batteryPcnt; } Serial.print("---------- Battery: "); Serial.println(batteryPcnt); mytime = millis() + dht.getMinimumSamplingPeriod(); } Serial.println(mytime); // Sleep until interrupt comes in on motion sensor. Send update every two minute. gw.sleep(INTERRUPT, CHANGE, SLEEP_TIME); }i get this output:
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
6608
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
6608
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
6608
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
6608
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
send: 10-10-255-255 s=255,c=3,t=7,pt=0,l=0,st=fail:
send: 10-10-0-0 s=2,c=1,t=1,pt=7,l=5,st=fail:41.7
---------- Humidity: 41.70
send: 10-10-0-0 s=4,c=1,t=23,pt=2,l=2,st=fail:38
---------- Light: 38
---------- Battery: 100
11148
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
11148
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
11148
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
11148
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
11148
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
send: 10-10-255-255 s=255,c=3,t=7,pt=0,l=0,st=fail:
---------- Battery: 100
15441
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
15441
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
15441
---------- PIR: 0
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
15441
---------- PIR: 1
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=ok:1the pir sends 0 and didnt sleep right :(
-
What is this number? Did you print the milis()?
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
6608 <<<<<< -
What is this number? Did you print the milis()?
send: 10-10-0-0 s=1,c=1,t=16,pt=0,l=1,st=fail:0
6608 <<<<<< -
#define PIR_SENSOR_DIGITAL 3 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define INTERRUPT PIR_SENSOR_DIGITAL-2 // Usually the interrupt = pin -2 (on uno/nano anyway) #define HUMIDITY_SENSOR_DIGITAL_PIN 2 #define LIGHT_SENSOR_ANALOG_PIN 0Are you connecting both DHT and PIR at same pin 2 ? That must be the cause (DHT is triggering the interruption, I think you want only the PIR to trigger it).
Edit: looks like your PIR is at pin 3 , and DHT on pin 2 --- Should be the inverse? The PIR should be on pin 2 (to trigger the interrupt).
Home Assistant / Vera Plus UI7
ESP8266 GW + mySensors 2.3.2
Alexa / Google Home -
#define PIR_SENSOR_DIGITAL 3 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define INTERRUPT PIR_SENSOR_DIGITAL-2 // Usually the interrupt = pin -2 (on uno/nano anyway) #define HUMIDITY_SENSOR_DIGITAL_PIN 2 #define LIGHT_SENSOR_ANALOG_PIN 0Are you connecting both DHT and PIR at same pin 2 ? That must be the cause (DHT is triggering the interruption, I think you want only the PIR to trigger it).
Edit: looks like your PIR is at pin 3 , and DHT on pin 2 --- Should be the inverse? The PIR should be on pin 2 (to trigger the interrupt).
@rvendrame Pir sensor is defined as 3
interrupt pin is defined as INT1: 3 - 2 = 1
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