![Function
Javascript function
◦ msg the message received
◦ context.global values stored with the value node
◦ return sends the message
May have multiple outputs
◦ return [o1, o2, o3]
34](https://image.slidesharecdn.com/iot3-150624012636-lva1-app6892/85/Software-for-the-Internet-of-Things-34-320.jpg)
Software for the Internet of Things
- 1. Software for the Internet of Things SUMMER SCHOOL
- 2. Outline Wyliodrin Wyliodrin Library Overview What language should I use? Visual Programming Streams Programming Signal Processing Questions 2
- 5. Dashboard 5
- 7. Export Two arrays ◦ Timestamps ◦ Values 7
- 8. Open Source Library 8 Arduino API ◦ C/C++ ◦ Python ◦ Javascript Visual Programming Streams programming Hardware Independent API
- 11. Similar to Arduino Library pinMode (pin, mode) ◦ INPUT or OUTPUT digitalWrite (pin, value) digitalRead (pin) ◦ HIGH (1) or LOW (0) analogWrite (pin, value) - PWM ◦ 0 – 255 analogRead (pin) ◦ 0 – 1023 11
- 12. What Language Should I use? 12 www.wyliodrin.com
- 14. Prototyping Drag and drop blocks Writes code in Python or Javascript Good for documentation 14
- 15. Python 15
- 17. Data Driven Programming Event based Data determines actions The program is a graph Elements ◦ Nodes ◦ Data routes 17
- 18. Messages Nodes send messages to each other ◦ An input ◦ Multiple outputs When a message arrives in the input ◦ Node activates ◦ Might send out some messages Example 18
- 19. Messages Javascript objects Nodes expect to receive payload { topic: payload: … } 19
- 20. Nodes Run Digital and analog pins access Trigger Delay Value Buffer Switch Change Range Function Visual Subflows Signals Messages Print Web request Web server 20
- 21. Run Sends a message at a certain interval Payload: ◦ Timestamp ◦ Blank ◦ String ◦ # number of message 21
- 22. Print Prints to the screen ◦ Only payload ◦ Whole messages ◦ Some field May be stopped with the button 22
- 23. Digital and analog pins access Digital write ◦ Writes HIGH(1) or LOW (0) when it receives a message ◦ The value written is the payload 23
- 24. Digital and analog pins access Analog write ◦ Writes PWM when it receives a message ◦ The value written is the payload 24
- 25. Digital and analog pins access Digital read ◦ Reads HIGH(1) or LOW (0) when it receives a message ◦ The value read is sent in the payload 25
- 26. Digital and analog pins access Analog read ◦ Reads an analog value when it receives a message ◦ The value read is sent in the payload 26
- 27. Trigger When it receives a message ◦ Sends a message with Output as payload ◦ Waits for some time ◦ Sends the second Output as a payload 27
- 28. Delay Delay ◦ Sends the received message with a delay Limit ◦ Limits the number of messages that it sends ◦ Drops or storas messages 28
- 29. Value Value ◦ Stores the payload ◦ context.global._value_name_ 29
- 30. Buffer When it receives a messages ◦ Adds the payload and other properties to an array ◦ It sends the array when ◦ The buffer is full ◦ Receives an event 30
- 31. Switch When it receives a messages ◦ Checks some rules ◦ Send the message using the rule’s output ◦ Values may be used ◦ {{value}} 31
- 32. Change Modifies the properties of a message 32
- 34. Function Javascript function ◦ msg the message received ◦ context.global values stored with the value node ◦ return sends the message May have multiple outputs ◦ return [o1, o2, o3] 34
- 37. Send signal Sends a signal ◦ To the dashboard ◦ To another board 37
- 38. Receive signal Receives a signal ◦ Sends a message with the signal received ◦ Payload is the value ◦ Topic is the name ◦ Sender ◦ User id if it comes from the dashboard ◦ Board id if it comes from a board 38
- 39. Send message Sends a message to another board ◦ The message is the payload ◦ Uses label instead of port 39
- 40. Receive message Receives a message from another board ◦ The message is the payload ◦ Sender is the board’s id ◦ Uses label instead of port 40
- 42. Octave Similar to Matlab Works on IoT Servers Process signals ◦ Export values from dashboard 42
- 43. Questions? 43