https://github.com/domochip/wds18b20

D1 Mini and a wide DS18B20 network with Tasmota
https://github.com/domochip/wds18b20

esp8266 jeedom onewire temperature wireless

Last synced: 3 months ago
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D1 Mini and a wide DS18B20 network with Tasmota

• Host: GitHub
• URL: https://github.com/domochip/wds18b20
• Owner: Domochip
• Created: 2017-11-26T16:41:46.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2024-07-28T20:43:26.000Z (5 months ago)
• Last Synced: 2024-07-28T21:45:23.006Z (5 months ago)
• Topics: esp8266, jeedom, onewire, temperature, wireless
• Homepage:
• Size: 4.52 MB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# WDS18B20

This project allows you to build a wide DS18B20 sensors network **over a house**  

It uses : 

 - a D1 Mini (ESP8266)

 - some DS18B20 sensors

 - a customized Tasmota firmware

## Build your 1-Wire bus

In order to get a wide 1-Wire bus (one that cover a house), Dallas provides some recommendations into their application note AN148.

This project use the Improved Interface bellow that is able to support a **200 meters long bus**:

![Dallas AN148 ImprovedCPUBusInterface schema](img/AN148-ImprovedCPUBusInterface.jpg)

This one requires a pin for reading the bus state and another one as output to drive the bus low : I named it the "Dual Pin OneWire"

**Warning : If you build a large 1 Wire bus inside your house, keep in mind that some voltage may appear on this one by induction. You need to have a good knowledge about electricity and associated risks!!!**

## Build your WDS18B20

All files are inside schematic subfolder and has been designed with KiCad

### Schematic

![WDS18B20 schematic](img/schematic.jpg)

### PCB

![WDS18B20 PCB](img/pcb.png)![WDS18B20 PCB2](img/pcb2.png)

### Print your box

Box project (Fusion 360) can be found into `box` folder

![WDS18B20 Box](img/box.jpg)

## Code/Compile/Flash

A specific variation in the Tasmota code needs to be done before compilation.  

**Compile it yourself** by following bellow steps **OR precompiled binaries are available in Releases**.

### Prepare compilation environment

You need to follow Tasmota guides to be ready for compilation:  

https://tasmota.github.io/docs/Compile-your-build/

### Code

You need to edit `tasmota/tasmota_xsns_sensor/xsns_05_ds18x20.ino` file

1. enable `#define DS18x20_USE_ID_AS_NAME` by removing the '//' 

2. replace `#define DS18X20_MAX_SENSORS  8` by `#define DS18X20_MAX_SENSORS  16`

3. replace all `digitalWrite(DS18X20Data.pin_out, HIGH);` by `digitalWrite(DS18X20Data.pin_out, newLOW);`

4. replace all `digitalWrite(DS18X20Data.pin_out, LOW);` by `digitalWrite(DS18X20Data.pin_out, HIGH);`

5. replace all `digitalWrite(DS18X20Data.pin_out, newLOW);` by `digitalWrite(DS18X20Data.pin_out, LOW);`

6. save

7. Compile Tasmota

8. Rename resulting tasmota.bin to tasmota-WDS18B20-12.1.0.bin

### Flash

You will find all available tools to flash tasmota in the official documentation:  

https://tasmota.github.io/docs/Getting-Started/#needed-software

## Run

### Tasmota Configuration

You need to apply this Template:  

`{"NAME":"WDS18B20","GPIO":[0,0,0,0,0,0,0,0,1344,0,1312,0,0,0],"FLAG":0,"BASE":18,"CMND":"Module 0|TelePeriod 60"}`

To change number of digit after the dot on reported temperatures:  

`TempRes 2`

To Enable arithmetic mean over teleperiod:  

`SetOption126 1`

For more details, please refer to the Tasmota documentation:  

https://tasmota.github.io/docs/DS18x20

## And finally...

![WDS18B20 tasmota](img/tasmota.jpg)