Would be helpful when you post a link to your sensor's datasheet. Within a PSoC4 are OPAmps for signal conditioning that could help you.
For starters, look at this example from "100 projects in 100 days" initiative: "thermistor example". It does basically what you want - take an ADC reading and send it to the UART. You just need to remove the thermistor handling / temperature conversion (except when your sensor happens to be a thermistor, of course :).
Are you using DHT11 sensor, it requires a One Wire interface ?
Google "bit bang one wire" and there is code base out there to use a GPIO
pin on various processors to implement interface that you could possibly port.