ThingSpeak

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I am making use of the Matlab Coder to deploy Matlab functionality to a Raspberry pi. I would like to be able to deploy the ability to write to a ThingSpeak channel from the pi. I realise that this is possible using Simulink (via the ThingSpeak block) but was wondering if there is a simple way to do this via code deployed using the Matlab Coder. I have tried the obvious and found that the Matlab Coder does not recognise the ThingSpeakWrite command. However, it also doesn’t appear to be very straightforward to deploy http methods to enable updating the channel via the POST method. Any advice welcome.

I am trying to count cars on a highway using webcam, raspberry pi & Simulink model for data analysis using thingspeak & later using Amazon AWS. The project link, Makerzone Project. I am facing a problem with the Car Counter block in the Simulink model. I have developed a code performing all the operations for the project but I am unable to complete the simulink model from that code. Can anyone help me in modelling the simulink model?