Hi!
As you can already read in the title, I’ve got problems reading the Dallas DS18B20 on my Pico W.
It started at around 6pm last evening when I started experimenting with the SSD1306 connected to the same Pico. After that, the DS18B20 lost connection over and over (reporting 85°C) but recovering and reporting the correct temperature. Then, I’ve noticed it this morning that it doesn’t work properly anymore. I’ve tried filtering the 85°C out, but then it started to report inf °C. Then, I’ve added the resistor, tested it successfully with my esp8266 and changed the pin the DS18B20 is connected to twice.
Log:
<!-- snip -->
[16:25:48][D][dallas.sensor:082]: Found sensors:
[16:25:48][D][dallas.sensor:084]: 0x2707226138939b28
<!-- snip -->
[16:30:29][W][dallas.sensor:131]: 'Temperatur' - Resetting bus for read failed!
[16:30:29][D][sensor:109]: 'Temperatur': Sending state inf °C with 1 decimals of accuracy
<!-- snip -->
What I’ve tried
- I used the sensor with an esp8266 and it worked fine.
- I tried 2 other pins, same result
- Adding the 4.7kOhm resistor (Worked for a month without it)
- Unplugging the OLED
Actions that could have lead to this behavior:
Upgrading to Esphome 2023.4.2
I don’t really know when that was.
Adding the following code
i2c:
- id: bus_a
sda: GPIO20
scl: GPIO21
scan: true
- id: front
sda: GPIO6
scl: GPIO7
display:
- platform: ssd1306_i2c
i2c_id: front
model: "SSD1306 128x64"
rotation: "90°"
lambda: |-
it.printf(0, 0, id(roboto), "%.1f°C", id(temp).state);
it.printf(0, 15, id(roboto), "%.0fPPM", id(aquarium_tds).state);
font:
- file: "gfonts://Roboto"
id: "roboto"
size: 15
(This doesn’t seem to br formatted correctly but it works)
Config
<!-- snip -->
dallas:
- pin: GPIO20
update_interval: 10s
sensor:
# Temperatur
- platform: dallas
address: 0x2707226138939b28
name: "Temperatur"
id: "temp"
<!-- Config below was added as a part of troubleshooting and should replace the commented out section below that -->
- platform: adc
pin: GPIO28
name: "Aquarium tds raw voltage"
id: tds_raw_v
update_interval: 10s
unit_of_measurement: "V"
icon: "mdi:water-percent"
internal: true
# Temperature Compensated Voltage
- platform: template
name: "TDS TCV"
id: tds_tcv
unit_of_measurement: 'v'
accuracy_decimals: 3
lambda: 'return ((id(tds_raw_v).state) / (1 + (0.02 * ((id(temp).state) - 25.0))));'
update_interval: 10s
internal: true
# Temperature Compensated TDS
- platform: template
name: "Aquarium TDS"
id: aquarium_tds
icon: "hass:water-opacity"
unit_of_measurement: 'PPM'
accuracy_decimals: 0
update_interval: 10s
lambda: return (133.42*(id(tds_tcv).state)*(id(tds_tcv).state)*(id(tds_tcv).state) - 255.86*(id(tds_tcv).state)*(id(tds_tcv).state) + 857.39*(id(tds_tcv).state))*0.5;
<!-- The block below was commented out as a part of the troubleshooting process -->
# - platform: adc # Hier wird die rohe Spannung des TDS Sensors gemessen
# pin: GPIO28
# name: "TDS raw"
# id: tds_raw_v
# update_interval: 10s
# unit_of_measurement: "V"
# icon: "mdi:water-percent"
# internal: true
# filters:
# - filter_out: nan # Messfehler werden gefiltert
# - platform: template # Hier wird die Spannung mit der Temperatur verrechnet
# name: "TDS TCV"
# id: tds_tcv
# unit_of_measurement: 'V'
# accuracy_decimals: 3
# lambda: 'return ((id(tds_raw_v).state) / (1 + (0.02 * ((id(temp).state) - 25.0))));'
# update_interval: 10s
# filters:
# - filter_out: nan # Messfehler werden gefiltert
# internal: true
# - platform: template
# name: "Aquarium TDS"
# id: aquarium_tds
# icon: "hass:water-opacity"
# unit_of_measurement: 'PPM'
# accuracy_decimals: 0
# update_interval: 10s
# filters:
# - filter_out: nan # Messfehler werden gefiltert
# - median: # von 5 gemessenen Werten wird der Durchschnitt gebildet
# window_size: 5
# send_every: 5
# send_first_at: 5
# lambda: 'return (133.42*(id(tds_tcv).state)*(id(tds_tcv).state)*(id(tds_tcv).state) - 255.86*(id(tds_tcv).state)*(id(tds_tcv).state) + 857.39*(id(tds_tcv).state))*0.5;' # Verrechnung der Werte
- platform: hx711
name: "Weight Measured"
dout_pin: GPIO14
clk_pin: GPIO15
gain: 128
update_interval: 10s
filters:
- calibrate_linear:
- 373194 -> 0
- 346167 -> 1
- 292225 -> 3
- 278793 -> 3.5
unit_of_measurement: kg
<!-- snip -->
I’ve also got i²C configured, a pwm output which I didn’t include in the config above.
Looking forward to your help since I couldn’t find anyone who had the same issue where the sensor gets detected but reports inf °C.