I²C smartWiFi Smart Device
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This project is shared with the fischertechnik Corner website, as the first smart sensor is intended for the fischertechnik Robo TX controller.
This part in more technical oriented. |
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Selecting WiFi and MCU
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One major criteria is power consumption.
Albeit popular, the ESP8266 requires too much power, up to 400 mA. Additionally, it is poorly documented and lacks WiFi stability. More advanced radios, like the CC3100 or WINC1500 radios, or all-in-one CC3200 MCU, offer a better power management and a more stable WiFi connection. |
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Selecting the Framework and IoT Service
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Additionally, the MCU should support a RTOS-based framework for multi-tasking to managing I²C and WiFi events.
There are two requirements for the IoT service: transport the data to and fro, provide a end-user interface. |
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Blynk is a great choice, especially with the end-user interface displayed on an Android or iOS smartphone.
For optimised response time, a local server is recommended, like a Raspberry Pi or a BeagleBone. |
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Building the Prototype
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There was one single step for the prototype.
All the components, including the MCU, WiFi and I²C logic level converter, are taken off-the-shelf. WiFi radios current consumption peaks at 300~400 mA, too high to be powered by the RoboTX, which is limited to 250 mA. |
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The prototype involves, clockwise, from top-left:
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Finalised and Working Sensor
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The sensor is finalised, integrated into a standard fischertechnik 9 V battery box and working!
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