A configured uart is required.
Configure a list of sensors. The index is required, the rest is the standard sensor config.
Example:
sensor: - platform: serial_csv uart_id: my_uart # optional bed_temperature: name: Current Bed Temp ext_temperature: name: Current Ext Temp
https://github.com/ssieb/esphome_components/tree/master/components/serial_csv https://github.com/esphome/esphome/blob/dev/esphome/components/dht/sensor.py#L34