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# Measuring mash temperatures with custom equipment 🍺 🌡️ # Measuring mash temperatures 🍺 🌡️
![alt-text](@asset/1.png) _2025-02-03_
For yesterdays brew I wanted to improve something in the brewery, namely having a dedicated thermometer so I don't have to steal the one from the kitchen. I looked at what I had at home to see what I could build for cheap and dug up an old nodemcu, the esp8266 variant and remembered that I set it up with esphome sometime last year. After a quick check at the esphome documentation I found out that esphome supports the dallas ds18b20 temperature sensor which I have one of at home already but i picked up a couple more since in knew I wanted to be able to measure multiple things at the same time. ![brewing-setup](@asset/1.png)
Picture of equipment For yesterdays brew I wanted to improve something in the brewery, namely having a dedicated thermometer so I didn't have to steal the one from the kitchen. I looked at what I had at home to see what I could build for cheap and dug up an old nodemcu, the esp8266 variant and remembered that I set it up with esphome sometime last year. After a quick check at the esphome documentation I found out that esphome supports the dallas ds18b20 temperature sensor which I have one of at home already but i picked up a couple more since in knew I wanted to be able to measure multiple things at the same time.
![nodemcu](@asset/2.png)
_By Vowstar - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39477865_
Esphome made the setup very easy. After defining the onewire hub component i could go ahead and connect one sensor at a time to the bus and note down their addresses, I also marked each thermometer so I knew what sensor data would correspond to what physical sensor. I settled for three sensors to start with. Esphome made the setup very easy. After defining the onewire hub component i could go ahead and connect one sensor at a time to the bus and note down their addresses, I also marked each thermometer so I knew what sensor data would correspond to what physical sensor. I settled for three sensors to start with.
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To our suprise the result was pretty bad. While this method has yielded good beer for the nearly 50 last batches with this brewsystem, the numbers showed us that while the heating is set to 67c our malt bed takes nearly 30 minutes reaching the target temperature. This results in only 30 minutes of most efficient mashing. Our thought was that if we can become more efficient at extracting sugars out of the malt we can use less ingredient than we do to day, making the beer cheaper. To our suprise the result was pretty bad. While this method has yielded good beer for the nearly 50 last batches with this brewsystem, the numbers showed us that while the heating is set to 67c our malt bed takes nearly 30 minutes reaching the target temperature. This results in only 30 minutes of most efficient mashing. Our thought was that if we can become more efficient at extracting sugars out of the malt we can use less ingredient than we do to day, making the beer cheaper.
Looking at the graph I estimated that perhaps if we mash in at a highter temperature, say 75c, we would end up at the target 65c immediatealy, giving us 60 minutes of mash time at the right temperature. Looking at the graph I estimated that perhaps if we mash in at a highter temperature, say 75c, we would end up at the target 65c immediatealy, giving us 60 minutes of mash time at the right temperature.
## Attributions:
By Vowstar - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39477865