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PiRelay 8 Launched on Kickstarter by SB Components
https://bit.ly/3d5L6ok

A new Raspberry Pi HAT is about to launch on Kickstarter “Raspberry Pi Air Monitoring HAT | Real-Time PM Sensor For Raspberry Pi”, which is amazing as well as very useful HAT for now a days in polluted cities and other polluted areas and also a good product for learning as well.
Check here: https://www.kickstarter.com/projects/amritsingh/air-monitoring-hat-real-time-pm-sensor-for-raspberry-pi