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Basically SRF485 is a ultrasonic sensor Module with Ultrasonic Sensor + Microcontroller + 485 communication IC.
So if you are having trouble in using SRF485 you can use SRF05 some come controller like Arduino and a TTL to 485 Converter Module or MAX485 IC which will measure the distance and...
Check this link to interface relay to any controller using this you can interface a 5v relay to your selected controller.
for remote interfacing you can use a remote with RC5 protocol decode the received signal and then take necessary action.
check the online shop from this link: https://www.dnatechindia.com
they have variety of GPS Module(Quectel, Circomm, fastrack, MT3329) from which you can select. Contact them and they will help you in selecting the required GPS Module
MQ135 is a sensor with analog o/p you cannot connect it directly to the controller so you will require an external ADC or you can make a simple comparator circuit using op amp and give the digital o/p to the controller
there are various wireless communication medium that you can go for and depending upon the budget, range required and application you can select the communication medium. Here is what you can go for:
**broken link removed**: Less range and costly but secured
Zigbee : Medium Range and Low...