I am uploading data from a range of sensors to the IBM Watson cloud and trying to build an app using this application. How do make the sensor inputs into variables and see if they exceed a certain threshold value and add to a counter. I was thinking something like this but I may be on the wrong path
var sprint = global.get( "count")||0;
var accel = msg.payload.d.Z
if (accel > 1500) {
sprint++;
global.set('count', sprint);
}
return {payload : sprint };
forgive my mistakes I have minimal experience with Java script
Also does anyone know anyway to incorporate python or export data to a python application
Thank you colon for your reply <3,
When I test the function it gives an error that it isn’t able to read the input data however if I simply print the data without using a function beforehand to process it, the correct values print
It looks like two other function nodes have issues. They are fairly self explanatory...
You are not returning an object in node "... for kicks". E.g you should be retuning msg or {payload: x} but you are returning x
In node analyzing sprints, you are trying to access a property .Z of something that is undefined. Without seeing the code, it is impossible to say what. At a guess, in the previous node, where you return {payload : sprint }; you should instead do this...
msg.payload.sprint = sprint;
return msg;
By retuning msg you keep everything that was inside of it. My guess is .Z was in the original msg.payload but you lose that when you return a NEW message (this line creates a NEW message: return {payload : sprint }; that ONLY contains a .payload set to sprint)
Heres my third function (as a new user I can only upload two per post) Thanks for all the help I really appreciate it. Let me give you some background on what I am trying to do. This is a school project and I am using a variety of sensors connected to a chip that is cloud connected to import it's data into IBM Watson. For example I am looking at Accelerometer Z axis movement to detect a sprint. If the accel Z value exceeds a threshold value, I would like to count it as a sprint. As you can see I am also trying to implement a basic finite state machine with the accelerometer which is either in state 0 (resting) or in state 1 (sprinting). I am also using the gyroscope y axis to detect kicking of a ball during a soccer game. similar to the sprinting code it counts kicks after the value has exceeded a specific threshold value. However this is more simple since it does not need to implement a FSM. In addition to all that I would like to display the battery level which does not need to be processed unlike the other two features of my app. IF i can get some guidance how to do this I would greatly appreciate it
msg.payload = msg.payload.d.Y;
return msg; //<<< return the msg OBJECT not the value!
Change last line in node analyzing sprints
from ...
return {payload : sprint };
to...
msg.payload.sprint = sprint;
return msg;
NOTES:
Use debug nodes with "show full object" set - ON THE OUTPUT OF EVERY NODE to see what happens to the message as it travels down the wires
Try not to delete the original payload by returning a new {object}. Instead, just add to the original msg. e.g. msg.newPropery = "hello new property inside the msg object". This way you still have access to anything added to msg as it travels through your flow.
In future, please post code (between three backticks ```code here``` ) instead of screen shots of function code
Thanks for the help Steve. I integrate the changes you suggested but I getting the "TypeError: Cannot read property 'Z' of undefined" or it says undefined for my other nodes." What do you recommend that I do. Thanks for all the help I highly appreciate it
Always worthwhile - note however he is still sending a value rather than an object
In Def sprint code (which is wired to Analyzing Sprints Code) he returns... return {payload : sprint }
There is no way he can access msg.payload.d.Z in the next node.
@rayy please read what we have posted - in particular...
AND
Firstly- for your understanding - look at this...
So on that 2nd point - dont delete the msg -- change Def sprint code as follows...
var sprint = global.get( "count")||0;
sprint++;
global.set('count', sprint);
msg.payload.sprint = sprint; //<<just add a property to msg instead of returning a new one!
return msg;//return the original msg that was passed in - it will still have stuff from previous node!
now when the msg gets sent to the next node (Analyzing Sprints Code) it will still have all of the original stuff in it FROM THE PREVIOUS NODE - including the msg.payload.d.Z part you are trying to access! (you can verify this my putting debug nodes (set for "show full msg") connected to the output of every node)
Also, change Analyzing Sprints Code to (explanation in the comments)...
var accel = msg.payload.d.Z ////get the accel value sent by the node BEFORE 'Def sprint'
var sprint = msg.payload.sprint;//get the sprint value you added to payload in 'Def sprint'
if (accel > 1500) {
sprint++;
global.set('count', sprint);
}
msg.payload.sprint = sprint;//update payload.sprint for the next node!
return msg;//return msg with all the original stuff + the updated sprint value
IMPORTANT NOTE...
I have no idea what your logic is supposed to do - I am just correcting the obvious errors and misunderstandings. Even if you get this bit to work, I suspect it will not function as you expect. Hopefully, what I have written here will help you grasp whats going on.
And dont forget - add DEBUG nodes to EVERY OUTPUT & look at what they contain.
