Nowadays it seems almost obligatory that electronic gadgets have a touch screen display user-interface. Such a display has now been incorporated in a Greenhouse Gas Monitor ( see 28 July 2022 ).
This particular display type is a 2.8" 240x320 pixel touch panel display with SPI and using the ILI9341 driver chip. On the back is an SD card slot. Cost when purchased was just under GBP11.
Either Methane ( CH4 ) or Carbon Dioxide ( CO2 ) concentration data can be displayed separately in real-time by tapping on a displayed 'button', without having to connect to the 'ThingSpeak' or 'Ubidots' cloud repositories as before in order to view the data; the cloud would still be required, however, for data storage ( unless SD card used ) and processing.
An experimental version comprising the display and an ESP32 micro-controller development board ( with new firmware ) mounted on a prototyping board was assembled and connected to the same pair of outdoor gas sensors ( MQ-4 & MQ-135 ) used previously.
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| The Methane CH4 concentration is selected |
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| The Carbon Dioxide CO2 concentration is selected |
( SPI = Serial Peripheral Interface )
