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+--- Thread: rs485 SHT (/showthread.php?tid=8179)
rs485 SHT - Read.0h1 - 06-11-2025
I apologize for my lack of knowledge here but I am trying to set up an SHT temperature and humidity sensor (purchased through your website) to my F16 board. I found YAML in a different thread and copied it and changed the pin numbers to match my board. I am using ESPhome through Homeassistant. The YAML pertaining to the temperature humidity sensor is as follows:
uart:
- id: uart_modbus
baud_rate: 9600
tx_pin: 16
rx_pin: 17
# Config Modbus
modbus:
uart_id: uart_modbus
id: modbus1
modbus_controller:
- id: modbus_sensor
address: 0x01 # device address
modbus_id: modbus1
sensor:
- platform: modbus_controller
modbus_controller_id: modbus_sensor
name: "RS485 Temperature Sensor"
id: temperature_sensor
address: 0x0000
register_type: holding
value_type: U_WORD
unit_of_measurement: "°C"
accuracy_decimals: 1
filters:
- lambda: if (x < 10000) return x * 0.1; else return -1 * (x - 10000) * 0.1;
- platform: modbus_controller
modbus_controller_id: modbus_sensor
name: "RS485 Humidity Sensor"
id: humidity_sensor
address: 0x0001
register_type: holding
value_type: U_WORD
unit_of_measurement: "%"
accuracy_decimals: 1
filters:
- multiply: 0.1
The sensors read as unavailalbe in homeassistant. I have a feeling that the issue may be in the address of the specific sensors, but I have no idea since I have never used the RS485 pins before.
RE: rs485 SHT - admin - 06-12-2025
take a photo of your sensor.
this is RS485+SHT30 sensor. if you only use SHT30 sensor, you should connect with i2c bus interface.
RE: rs485 SHT - Read.0h1 - 06-12-2025
It’s the one from your website. It has rs485 A+B pins
https://shop.kincony.com/products/rs485-temperature-and-humidity-sensor-modbus-rtu-use-by-sht30
RE: rs485 SHT - admin - 06-12-2025
you can use PC softare to test sensor first. make sure you have set the correct baud rate and rs485 address.
RE: rs485 SHT - Read.0h1 - 06-13-2025
Is there recommended software? Also will I need a usb to rs485 adapter?
RE: rs485 SHT - admin - 06-15-2025
yes, use usb-rs485 adapter to debug firstly is better.