Difference: PublishAndSubscribe (4 vs. 5)

Revision 52019-06-09 - UliRaich

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Start Presentation

Slide 1: Setting up and IoT

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The CayenneMessage class

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cayenneMsg.png

Analogue to Digital Conversion

Often real world signals are analogue in nature.

Before treating them digitally we must convert them to digital values

This is done by an Analogue to Digital Converter

The ESP8266 has a 10 bit ADC on chip, the ESP32 has 3 12 bit ADCs

To demonstrate this we use a photo resistor reading the light intensity.

Photo resistor and LED

The photo resistor and the 1 kΩ resistor form a voltage divider

The LED can be switched on by program and changes the light

Intensity seen by the photo resistor

photoresistorSchema.png proto.png

ADC readout

The ADC and GPIO driver classes

are already available in MicroPython.

This makes readout a child’s game.

 protoDriver.png

Prototype board on Cayenne

cayenneProtoCode.png

The prototype GUI

cayenneProtoResult.png

History of Intensity Measurements

cayenneProtoHistory.png

A trigger in Cayenne

We will observe the light intensity a and switch a light on, if it gets too dark

cayenneTrigger.png

The trigger code

triggerCode.png

 

A Qt app and Cayenne MQTT

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