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  • art_tech's entry Arduino-controlled DIY Coffee Roaster is a winner in the Arduino Contest 2019 contest 6 weeks ago
  • art_tech commented on art_tech's instructable Arduino-controlled DIY Coffee Roaster6 weeks ago
    Arduino-controlled DIY Coffee Roaster

    Good question! The parts in this guide are about 150 GBP / 180-200 USD. The cheapest worthwhile off-the-shelf roasters I am aware of start at three times that, like the Gene Cafe. But those don't give you fully automatic control through Artisan, like this does - and that really is the main point.

    You're welcome - thank you for the enthusiastic feedback! :)The Freshroast is interesting, as it's a fluid bed roaster, working on the same principle as these hot-air popcorn machines. Essentially, what it gives you is the same as the stock popcorn machine plus some basic manual fan and heater controls. It does not give you a temperature reading. But this is important: Different ambient temperature, different beans, or a number of other parameters, can mean that the same heater output results in a different temperature. So you would want to monitor the actual temperature, and adjust your settings based on that. Nor does it give you very fine-grained control of heater or fan, just three settings for the heater for instance.Actually, I should have written "electronic control" or...

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    You're welcome - thank you for the enthusiastic feedback! :)The Freshroast is interesting, as it's a fluid bed roaster, working on the same principle as these hot-air popcorn machines. Essentially, what it gives you is the same as the stock popcorn machine plus some basic manual fan and heater controls. It does not give you a temperature reading. But this is important: Different ambient temperature, different beans, or a number of other parameters, can mean that the same heater output results in a different temperature. So you would want to monitor the actual temperature, and adjust your settings based on that. Nor does it give you very fine-grained control of heater or fan, just three settings for the heater for instance.Actually, I should have written "electronic control" or "precision control" or something here, instead of "automatic". Even if you don't automate the process, having a precise, real-time temperature reading and fine-grained output control in Artisan makes a huge difference in what you can achieve.But you can do automatic control in Artisan, too. For instance, you could have the fan speed adjusted as the roast progresses. Or, to be truly fully automatic, you can have Artisan and the TC4+ implement a closed-loop PID controller. With that, you only tell Artisan the temperature to aim for, or even an entire temperature curve to follow, and it will adjust heater output automatically based on the thermocouple readings. This is what I do in practice, and it means that once you have found a roast profile you like, it's essentially one click to recreate it automatically in the future. I don't go into this in detail in this Instructable, since I wanted to focus more on the hardware for this one. But check out the links in the last step for more information.

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  • art_tech's instructable Arduino-controlled DIY Coffee Roaster's weekly stats: 6 weeks ago
    • Arduino-controlled DIY Coffee Roaster
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  • art_tech's entry Arduino-controlled DIY Coffee Roaster is a finalist in the Arduino Contest 2019 contest 7 weeks ago