I tried the 4 pin ultrasonic sensor within the arduino IDE and it is working well.

Within the Embrio, there is no change at all for the Activation output, it seems that there is no input read.

Any hint?

Thanks.

This is the code used, the one I found into your Custom Node Arduino Library->Inputs.

<Nodes>
<Node>
<UniqueID>726902f2-6bc5-4a82-85b3-794a8ff1843f</UniqueID>
<AssemblyType>Embrio.NodeEngine.AgentController.Nodes.AgentControllerCustomArduinoNode</AssemblyType>
<NodeType>Custom Arduino Node</NodeType>
<UserDefinedName>4 Pin Ultrasonic Sensor</UserDefinedName>
<Description>A node that lets you write any Arduino code to interact with the Arduino hardware. Can be both an input and output.</Description>
<NodeColor>201,204,227,255</NodeColor>
<X>0</X>
<Y>0</Y>
<Width>512</Width>
<IncludeCode></IncludeCode>
<DeclerationCode>int echoPin = 7;
int trigPin = 8;
int maxPulse = 100; // Maximum micros to wait for a pulse
long duration;
</DeclerationCode>
<SetupCode>pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
</SetupCode>
<ImageName>185FD26C2851.png</ImageName>
<InfoURL>http://embrio.io/custom-arduino-nodes/inputs/distance-sensors/4-pin-ultrasonic-sensor</InfoURL>
<CodeDefinitions>
<CodeDefinition>
<UpdateCondition>EveryUpdate</UpdateCondition>
<Code>digitalWrite(trigPin, LOW);
delayMicroseconds(2);

digitalWrite(trigPin, HIGH);
delayMicroseconds(10);

digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH, maxPulse);

Output_Activation = transform(duration, 0, maxPulse, 0.0, 1.0);
</Code>
<UniqueID>412bc09a-957a-4afb-bca6-32497120f10a</UniqueID>
</CodeDefinition>
</CodeDefinitions>
<Inputs>
<Input>
<UniqueID>dd7cb568-36f9-4c51-85d9-b812cca9e8f4</UniqueID>
<DefinitionID>00000000-0000-0000-0000-000000000000</DefinitionID>
<DefaultName>Trigger</DefaultName>
<CustomName></CustomName>
<IsDisplayed>True</IsDisplayed>
<IsNative>False</IsNative>
<TypeName>Trigger</TypeName>
<IsOutsideConnection>False</IsOutsideConnection>
<IOType>Embrio.NodeEngine.NodeIO.TriggerNodeInput</IOType>
<ShowGraph>False</ShowGraph>
<LinkedIOID>00000000-0000-0000-0000-000000000000</LinkedIOID>
<IsUserAdded>True</IsUserAdded>
<ConnectedOutputs></ConnectedOutputs>
</Input>
</Inputs>
<Outputs>
<Output>
<UniqueID>a76fff89-5e54-4a78-a65f-c2c0eb30756b</UniqueID>
<DefinitionID>00000000-0000-0000-0000-000000000000</DefinitionID>
<DefaultName>Activation</DefaultName>
<CustomName></CustomName>
<IsDisplayed>True</IsDisplayed>
<IsNative>False</IsNative>
<TypeName>Numeric</TypeName>
<IsOutsideConnection>False</IsOutsideConnection>
<IOType>Embrio.NodeEngine.NodeIO.NumericNodeOutput</IOType>
<ShowGraph>True</ShowGraph>
<LinkedIOID>00000000-0000-0000-0000-000000000000</LinkedIOID>
<IsUserAdded>True</IsUserAdded>
<MinValue>0</MinValue>
<MaxValue>1</MaxValue>
<UseNegativeRange>False</UseNegativeRange>
<CanUseNegativeRange>True</CanUseNegativeRange>
</Output>
</Outputs>
</Node>
</Nodes>

Edited by user Monday, April 13, 2015 6:39:10 PM(UTC)  | Reason: Not specified

Keep in mind the 3rd parameter of the pulseIn function is a timeout. If you're not getting a reading within 100 microseconds it'll return a 0: http://arduino.cc/en/Reference/pulseIn

Could you be using a different maxPulse value in Embrio than in the Arduino IDE?

That's right. If we want to detect a longer distance, we have to increase the maxPulse.

In the Adruino, the third parameter of the function pulseIn is not present.

Thanks all.

I use 5555 as my time out setting, this works out to about 1 meter.

I also have added: if(duration == 0) duration = maxPulse;
before the transform statement, this makes sure that greater distances always give a 1 instead of 0. So that 1 is = 1 meter of more and 0 = very close.