Smokehouse analogue thermometer for PT1000, LM358 and ESP8266

Here you have everything clearly described https://learn.adafruit.com/adafruit-max31865-rtd-pt100-amplifier/overview

sznickers wrote:

I'm still wondering how many pins I need for such a circuit....

3 + 1 for each sensor/transducer
https://forum.arduino.cc/t/comunication-pins-for-max31865/443799

Thank you, gentlemen.

I'm struggling with DS18B20 sensors. It used to work nicely for me and I have several of them. They are placed in each room and from each to the garage to the ESP with a cable connected by twisted-pair ....FTp cat 6e shielded cable. I've changed the pull-up resistors from 4.7 kOhm down, tried at 5v and 3.3v but it keeps blowing up for me. Maybe the important thing is that in one pair of twisted pair cables - e.g. white and blue are in one screen, maybe the point is that it would be better if each cable in a separate screen ? and separately the +, separately the signal? There are also different lengths of cables. I connect 3 by wire (+,-,signal). I am also combining on different GPIOs.

I am currently working on a weather station and have come to the conclusion that not every pin of the ESP32 WROOM is suitable for 1-wire operation. In my case it works well on pin 4. I can send you a piece of code that works.

https://randomnerdtutorials.com/esp32-pinout-reference-gpios/

Thank you.
It is precisely those end pins that are a good topic. The ones that can be supposedly only as input:
GPIO 34
GPIO 35
GPIO 36
GPIO 39
So, I ask myself, what to use them for? I tried connecting 1-wire to them-it doesn't work. SDA SCL doesn't either. Well, unless just as a button.
I'm currently operating on ESP32 WTH01 boards-with RJ45 socket-cable connectivity, so a lot of pins are out of my menu. I have a PCF8574 (i2C) input/output extension module - I've connected relays to it and it works beautifully, but it's rather impossible to connect a ds180b20 to this module, for example.



Added after 1 [minute]:

>>21777349 you are probably talking about Arduino, I am working on ESP-Easy for now, but arduino I will also learn because there you can connect several 7 segment displays to one board. I have some of the sensors also on GPIO-4.

Put pulse counters on input only

also be interested in DS2482-100, DS2482-800, DS2484

>>21777470
Thanks-good idea with the pulse counter on those pins-that's what I'll do.
As for that 1-Wire bridge.
Looks cool this one, has 8 ds18b20 inputs and still addressable, so there are lots of options
https://botland.com.pl/konwertery-pozostale/2...emma-qtqwiic-adafruit-6027-5904422388065.html
but it is expensive - so cheaper to buy a new board and enlarge the switch to rjs.
This one from ali:
https://pl.aliexpress.com/item/10050097088722...ect_id%3A1005009708872261%7C_p_origin_prod%3A
a bit different and I don't know how many sensors can be connected here, maybe just one.
I am still considering the option of temperature sensors over i2c (for rooms)
LM75A-expensive.
He has addressing, so you could have a lot of them, the only question is how such a sensor will behave on a long shielded cable. But I read that in such a situation you have to give SDA and SDL in separate shields.
https://pl.aliexpress.com/item/32659878517.ht...9e94eee824aa32a2f0433b9&afSmartRedirect=y

Added after 16 [minutes]:

tos18 wrote:

Pulse counters give on input only

Works thanks


Added after 51 [minutes]:

Such a curiosity.
Same YF-B6 pulse counters, same type, same diameter, Hall ch. based flow meters.
Connected in series - one after the other - i.e. same flows.
Each individually connected on a different ESP board on the same pin 35.
Both have the same settings, yet one calculation result has to be divided by 36 and the other 46 to indicate the same thing - so they are in series.

As for the 1-wire and ds18b20 - several sensors on long cables to individual rooms, I see the cause in the power supply - not sure what the issue is is the power supply. It runs fine on +3.3v and a 3.3kOhm resistor, on +5v it doesn't want to work.
i took the +3.3v from the esp, but the question is how many such sensors can be max connected on 3.3 to the board so as not to overload it, so
question like this:
If I would take an inverter from 5v to 3.3v and connect it to the 5v power supply of the whole circuit and take this 3.3v directly from this voltage inverter. Will this be good?

sznickers wrote:

When it comes to 1-wire and ds18b20 - several sensors on long cables to individual rooms I see the cause in the power supply - not sure what the issue is is the power supply. It works fine on +3.3V and a 3.3kOhm resistor, on +5V it doesn't want to work.

Maybe capacitors yes 100n each on the power supply at each DS ?

I think I've found the likely cause-but thanks for the hint with the capacitors-I'll check that too.
The cause is probably that I fly one by one with these ds and connect it once at 3.3v once at 5.0v and check where it goes, group it, then connect it together and test.
For me you have to take a correction-I'm not an electrician or an electronics engineer, it's my hobby. And so I learn by trial and error.

I have another proposal. We find a so called troll, and throw it out because it interferes with other ds, we give a new one-Ds18b20. Cheap Chinese, probably the original ds18b20 would work better.

Added after 1 [minute]:

>>21778843
A capacitor will perhaps help with long cables.

sznickers wrote:

I have another conclusion. We find a so called troll, and throw him out because he interferes with other ds, we give a new one-Ds18b20. Cheap china

Maybe the problem with the Chinese is the duplication of sensor serial numbers (serial number).

>>21779966
this is also an interesting conclusion, but what would the whole long number have to agree on ?
28-af-7f-3c-00-00-00-3e [DS18B20]
it's like hitting the lottery

Check maybe you've hit the jackpot. Maybe it's your troll

When one ds18b20 sensor is on one pin it's easier, but when there are several it can get off. And if I have a decisive temperature sensor, e.g. the supply temperature sensor from the fireplace - which switches on my circulating pump-thermostat, when the sensor blew out, the rule didn't work - that's why I'm testing with these analogues - maybe they will be more reliable.