continuous servo 

https://create.arduino.cc/projecthub/team-matlab-iot/make-your-air-safer-alerting-indoor-iot-air-quality-monitor-5eb90d?fbclid=IwAR3xwB_BRzBToF

https://arduinoteam2021.blogspot.com/

https://www.circuito.io/app?components=512,9570,11021

https://create.arduino.cc/projecthub/cstram/sensor-station-ca57d1?fbclid=IwAR1nv5M_P1ioCyxVfJ6qgQ6NjVLBQQvOB5BhLENKdlpr7Bfmm1zlYoN_238

https://www.circuitbasics.com/arduino-ir-remote-receiver-tutorial/