ESP32 based weather station

ws_espy 2025.11.04

Dev seteup

• python
• uv
• make

Wind sensor wiring

PR-3000-FSJT-N01

• green - 485-A
• blue - 485-B
• black - Gnd
• brown - +Vcc (10-30V)

4800 8N1 CRC

120 Ohm line terminal resistor

addr: 1

• https://devices.esphome.io/devices/Renke-RS-FSJT-N01-Wind-Speed
• https://devices.esphome.io/devices/Renke-RS-FXJT-N01-Wind-Direction

Module connection cable

• orange - +5

• orange-white - not connected

• green - 1-wire data

• green-white - ground

• brown - +12

• brown-white - ground

• blue - 485-B

• blue-white - 485-A

Modbus notes

Sample:

• send (addr, func, reg, num, crc): 0x01 0x03 0x00 0x00 0x00 0x01 0x84 0x0A

• recv (addr, func, len, bytes, crc): 0x01 0x03 0x02 0x00 0x56 0x38 0x7A

• value: 0x00 0x56 -> 86 -> 8.6 m/s

• The device modbus address is stored in register 2000 (0x07D0) - [1-247]

• The device baud rate is configured in register 2001 using an ID:

• ? Baud rate ID

• ? 2400 0

• ? 4800 1

• ? 9600 2

• ? 19200 3

RHUMBS = [0, 45, 90, 135, 180, 225, 270, 315]

mbpoll -m rtu -b 4800 -d 8 -P none -s 1 -a 1 -r 1 -c 1 -l 1000 -o 1 /dev/tty.usbserial-1340

• https://kotyara12.ru/iot/esp32_rs485_modbus/
• https://minimalmodbus.readthedocs.io/en/stable/
• https://pymodbus.readthedocs.io/en/latest/ ???

ESP32

MicroPython images:

• https://micropython.org/download/ESP32_GENERIC/

• https://micropython.org/download/SEEED_XIAO_SAMD21/

• https://lastminuteengineers.com/esp32-pinout-reference/

• https://lastminuteengineers.com/esp32-wroom-32-pinout-reference/

• https://github.com/espressif/esptool

• https://docs.micropython.org/en/latest/reference/mpremote.html

Other tools

• https://github.com/astral-sh/uv

• https://docs.astral.sh/uv/

• https://pypi.org/project/adafruit-ampy/

• https://github.com/dhylands/rshell

• https://github.com/wendlers/mpfshell

Application

Libraries

Copy files from repo to mrequests folder:

• https://github.com/SpotlightKid/mrequests

Config environment

Copy env.example to .env and set correct values.

Use ENV_FILE to specify different config file.

ENV_FILE=.env make deploy-config

Set Device Address

apt install python3-serial

See: scripts/setaddr.py

read_register(addr=1,2000) 01030200017984
1
read_register(addr=1,2001) 01030200017984
1
read_register(addr=1,2002) 0103020000b844
0
read_register(addr=1,2003) 01030266ed53a9
26349
read_register(addr=1,2004) 0103024d5e0cec
19806

ESP32 C3 Super Mini

• https://www.espboards.dev/esp32/esp32-c3-super-mini/

• Blue LED (gpio 8)

TODO

• implement interactive configuration