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Temperature sensors for web-enabled ventilation - which ones to choose?

stefbut 1653 17
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How can I build a low-cost system for reading four wired temperature sensors for ventilation and view the values over the internet from outside the network?

Yes — the cheapest practical solution proposed was an ESP8266 with multiple DS18B20 temperature sensors on a 1-Wire bus, using ESP Easy or Blynk for internet access [#17759273][#17759324][#17759407] DS18B20 sensors can share one cable because they work over 1-Wire, so four sensors do not require four separate controllers [#17759324] A ready-made option mentioned was a Sonoff with a DS18B20 socket, but the thread still pointed back to the ESP8266/DS18B20 DIY setup for four sensors [#17759306][#17759407] The original poster later confirmed a working build with an ESP8266 and DS18B20 sensors, online viewing in an app, and graphs on ThingSpeak, with the whole system costing about 50 zł [#17766009]
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  • #1 17759246
    stefbut
    Level 14  
    Posts: 633
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    Board Language: polish
    Hello
    I need sensors for ventilation 4 pieces.
    Sensors to the control panel on wires while the control panel is wireless with access via the internet, preferably from the outside.
    Are there any inexpensive solutions of this type?
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  • #2 17759273
    piterek-23
    Level 33  
    Posts: 3321
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    ESP8266+DS18B20+ESP Easy+router with external IP
    You should be able to come up with 30zl.
  • #3 17759292
    stefbut
    Level 14  
    Posts: 633
    Rate: 98
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    Thanks but I don't know if I can do it, I don't know much about it, are there any „ready”?
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  • #4 17759302
    piterek-23
    Level 33  
    Posts: 3321
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    You wrote in the section "Home Automation and Domoticz " that means you have Domoticz?
    As they say, "the devil is not so terrible as he is painted". Search for the keywords I mentioned in my previous post and everything will become clear ;)
  • #5 17759306
    kood
    CCTV and Stationary Alarms specialist  
    Posts: 1896
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    Sonoff with DB18B20 socket
  • #6 17759312
    stefbut
    Level 14  
    Posts: 633
    Rate: 98
    Board Language: polish
    Sonoff has one temperature sensor I need 4.
    I have nothing posted in a forum that I thought was appropriate.
    If in the wrong place please move.
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  • #7 17759324
    piterek-23
    Level 33  
    Posts: 3321
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    stefbut wrote:
    Sonoff has one temperature sensor I need 4
    .
    The DS18B20 works on 1-wire, which means you can connect multiple temperature sensors on one cable.

    For starters see: TO and TO .
  • #8 17759407
    tomjed
    Level 28  
    Posts: 1065
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    ESP8266, four DS18B20 and e.g. BLYNK
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  • #9 17759877
    omnixcrs
    Level 11  
    Posts: 397
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    Will the device have wifi access?
  • #10 17759913
    stefbut
    Level 14  
    Posts: 633
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    Board Language: polish
    Yes there is wifi
  • #11 17760373
    tomjed
    Level 28  
    Posts: 1065
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    But that you want to see the temp from the four sensors while being "somewhere in the world"...?
    If that's all it's about, then the matter is I think trivial.... If you can install the software and connect the wires to the board then you can do it. I will help....
    kind regards
  • #12 17766009
    stefbut
    Level 14  
    Posts: 633
    Rate: 98
    Board Language: polish
    Ok thanks for your help, I've covered the topic.
    If anyone ever has this problem I would be happy to help.
    boardESP8266, and DS18B2 sensors
    8 temperature sensors, viewing in the app, online in the network.
    and graphs on
    https://thingspeak.com/channels/699181.
  • #13 17766804
    GrubyBat
    Level 7  
    Posts: 35
    Help: 1
    Rate: 4
    Board Language: polish
    You may be interested in the GPRS-A from Satel.
    Self-contained device, probably up to 8 sensors, dedicated application (pogdlad, switching on outputs) possibility of setting actions to temp like switching on outputs, notifications, no WiFi, has a GSM modem to this SIM for a few zloty you can fly around the whole year - maybe I helped ?
  • #14 17766873
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
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    Board Language: polish
    I have such a module for 4 DS sensors with storage on thingspeak.
  • #15 17766984
    stefbut
    Level 14  
    Posts: 633
    Rate: 98
    Board Language: polish
    Strumien swiadomosci swia wrote:
    I have such a module for 4 DS sensors with storage on thingspeak.
    .
    I also already have such a module.

    Added after 3 [minutes]: .

    GrubyBat wrote:
    Interest GPRS-A from Satel.
    Self-contained device, probably up to 8 sensors, dedicated application (pogdlad, switching outputs) possibility to set actions to temp like switching outputs, notifications, no WiFi, has a GSM modem to this SIM for a few zloty you will fly all year - maybe I helped ?
    .
    Cool but price from space.
    As I mentioned earlier, I have already assembled the measuring system.
    Price 50zl for everything.
  • #16 17767043
    Strumien swiadomosci swia
    Level 43  
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    Board Language: polish
    Give a link to thingspeak.
  • #17 17767047
    piterek-23
    Level 33  
    Posts: 3321
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    Strumien swiadomosci swia wrote:
    Give link to thingspeak.

    Post #12
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Topic summary

✨ The discussion revolves around selecting temperature sensors for a web-enabled ventilation system, specifically requiring four wired sensors connected to a wireless control panel with internet access. Various solutions were proposed, including using the ESP8266 microcontroller with DS18B20 temperature sensors, which can be connected in a 1-wire configuration, allowing multiple sensors on a single cable. Users also mentioned the Sonoff device, which supports temperature sensors but noted the need for multiple units. Alternatives like the GPRS-A from Satel were suggested, which operates without WiFi and can handle up to eight sensors. The conversation highlighted the importance of software integration for remote monitoring and control, with references to platforms like ThingSpeak for data visualization.
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FAQ

TL;DR: For web-enabled ventilation, 30 zł builds using ESP8266 + DS18B20 are proven—“You should be able to come up with 30zl.” Flash ESP Easy and expose it via a router with an external IP to read four sensors online. [Elektroda, piterek-23, post #17759273]

Why it matters: This gives DIYers and facility owners a low-cost, scalable path to monitor ventilation temperatures remotely without vendor lock-in.

Quick Facts

What’s the cheapest way to monitor four temperatures online?

Use an ESP8266 with DS18B20 sensors and ESP Easy firmware. Configure your router with an external IP for access. Builders report doing this for about 30 zł. It’s simple, supports multiple sensors, and is easy to expand. [Elektroda, piterek-23, post #17759273]

Can I put four DS18B20 sensors on one cable?

Yes. DS18B20 uses a 1‑Wire bus that supports many devices on one data line. As noted, “you can connect multiple temperature sensors on one cable.” The controller reads each sensor sequentially, which simplifies ventilation wiring. [Elektroda, piterek-23, post #17759324]

I’m not a programmer—are there any ready-made modules?

Yes. Sonoff devices with a DS18B20 socket let you plug in a temperature probe and manage it in their app. This is a quick path when you want minimal wiring and configuration. It suits simple temperature readouts. [Elektroda, kood, post #17759306]

Can a Sonoff read four sensors at once?

In this thread, Sonoff was noted with a single temperature input. For four measurement points, builders chose different hardware to handle multiple probes. That keeps the setup straightforward. [Elektroda, stefbut, post #17759312]

How do I see my temperatures from anywhere without port-forwarding?

Publish to a cloud dashboard like Thingspeak. A shared build shows eight sensors with in‑app viewing and online graphs. This avoids opening your router to the internet while keeping remote access. Share a link or keep the channel private. [Elektroda, stefbut, post #17766009]

I don’t have Wi‑Fi at the fan—what’s the alternative?

Use a cellular gateway such as the Satel GPRS‑A. It supports up to eight sensors, offers a mobile app, and can trigger outputs and notifications based on temperature. Add a low‑cost SIM for year‑round connectivity. [Elektroda, GrubyBat, post #17766804]

Will this work with Blynk or similar apps?

Yes. An ESP8266 with four DS18B20 sensors can send readings to Blynk for a simple mobile dashboard. It delivers quick visibility without running a full automation server. Great for remote temperature views. [Elektroda, tomjed, post #17759407]

Quick start: How do I set this up in 3 steps with ESP Easy?

  1. Flash ESP Easy firmware onto an ESP8266 board.
  2. Connect your DS18B20 sensors to the ESP8266 and add the DS18B20 device in ESP Easy.
  3. Configure Wi‑Fi and enable remote access via your router’s external IP. [Elektroda, piterek-23, post #17759273]

How do I wire multiple DS18B20 sensors correctly?

Use a 1‑Wire bus: connect sensors in parallel on one data line to a single microcontroller pin. Then enumerate sensors in software by their unique addresses. This keeps ventilation runs tidy. “You can connect multiple temperature sensors on one cable.” [Elektroda, piterek-23, post #17759324]

How much did a working build cost in this thread?

A complete build was reported at 50 zł for everything. The user assembled the measuring system with low-cost parts. This shows remote temperature monitoring can be done very cheaply. [Elektroda, stefbut, post #17766984]

Can I expand beyond four sensors?

Yes. One example used eight DS18B20 sensors on an ESP8266 with an app view and Thingspeak graphs. That demonstrates the approach scales well for ventilation zones. Expansion is straightforward. [Elektroda, stefbut, post #17766009]

Do I need an external IP to reach the device directly?

For direct internet access to your ESP8266, use a router with an external IP. Without it, direct remote access will fail; use a cloud dashboard instead. This applies when exposing services online. [Elektroda, piterek-23, post #17759273]

Is there a module that logs to Thingspeak out of the box?

Yes. A participant mentioned a module for four DS18B20 sensors with storage on Thingspeak. That gives ready cloud logging without extra coding. It’s handy for quick deployments. [Elektroda, Strumien swiadomosci swia, post #17766873]

I’m still unsure—can a beginner really do this?

Yes. A helper said the task is trivial if you can install software and connect wires. “If you can install the software and connect the wires to the board then you can do it.” Community help is available. [Elektroda, tomjed, post #17760373]

Are cellular solutions cost‑effective?

One builder compared a 50 zł DIY ESP8266 setup with the Satel GPRS‑A and called the latter’s price “from space.” Choose GSM when Wi‑Fi is impossible or reliability demands it. [Elektroda, stefbut, post #17766984]
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