'''
Raumklima
Create a webpage access point to show sensor data
Hardware:
ESP32 (sensor chip temperature)
DS18B20 temperature sensor
Sensirion SCD41 CO2 sensor
MicroPython v1.26.1 on 2025-09-11; Generic ESP32 module with ESP32
External libraries:
https://microdot.readthedocs.io/en/latest/intro.html
https://github.com/peter-l5/MicroPython_SCD4X
2026-01-20 mchris
'''
import network
import uasyncio as asyncio
from microdot import Microdot
import esp32
import machine
import onewire
import ds18x20
import scd4x
import gc
import time
gc.collect()
async def ap_mode(ssid, password):
print("Free heap before init:", gc.mem_free())
# DS18B20 on GPIO 4
dat = machine.Pin(4)
ds = ds18x20.DS18X20(onewire.OneWire(dat))
ds_sensors = ds.scan()
print('DS18B20 sensors:', ds_sensors)
gc.collect()
# SCD41 I2C
i2c = machine.I2C(1, scl=machine.Pin(22), sda=machine.Pin(21), freq=100000)
scd = scd4x.SCD4X(i2c)
print('SCD41 init...')
scd.start_periodic_measurement()
await asyncio.sleep(5)
print('SCD41 ready')
gc.collect()
print("Free heap before WiFi:", gc.mem_free())
# WiFi AP
ap = network.WLAN(network.AP_IF)
ap.active(True)
ap.config(essid=ssid, password=password)
while not ap.active():
await asyncio.sleep(0.1)
print('AP IP:', ap.ifconfig()[0])
print("Free heap after WiFi:", gc.mem_free())
app = Microdot()
app.ds_sensors = ds_sensors
app.ds_device = ds
app.scd_device = scd
@app.route('/')
async def index(request):
html = '''
Raumklima