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Good stuff: crafting materials for the barista

The taste of coffee largely depends on the degree of roasting, an area in which a great deal of experience is required. In order to determine the degree of roasting quickly and reproducibly, Zach Halvorson, founder of the sole proprietorship Expresso Vision, has developed a small device that determines and displays the degree of roasting. Devices for this can easily cost 1000 euros. By combining 3D printing and using manufacturing hardware and prototyping boards for microcontrollers, sensors, and displays, he developed a device that was priced at $ 299.

This Roast Vision consists of a housing with a USB-C connection for power. On the top there is a small OLED display and a measurement window. If you fill a measuring spoon with coffee into the small measuring gauge, the device indicates the degree of roasting of the coffee in a few seconds. Information is given in numbers (0-35, dark to light) and in words. Why not go straight to the most usual here Agtron-GourmetThe scale is converted is not known to us, there is a diagram on the website that provides this conversion.

Ready to measure

(Image: Expresso Vision)

The heart of the measuring device is SparkFun photodetector, the one with the MAX30101-The sensor measures the light returned by the coffee by the LED integrated into the sensor. This type of sensor is used, among other things, for the measurement of particles (smoke, dust, fog), distance measurement and also for the measurement of the oxygen saturation of blood in tissues. Other components of the Expresso Vision will be in a Sparkfun blog post not known.

SparkFun photodetector with MAX30101 sensor

(Image: Sparkfun)

Mainly, decision-makers assume on the basis of the dimensions that, for example, a SparkFun Qwiic Pro Micro is integrated into the Espresso Vision. However, if you take a closer look at the Espresso Vision page, you will see that a SparkFun Thing Plus – Artemis is installed as a plank. This is a bit surprising, because quite expensive, but in return it calculates quite quickly, contains Bluetooth LE and a microphone. An extension of the functions to an IoT device can be considered here.

Of course, SparkFun also offers OLED displays on and so you could go through those present on all the boards Qwiic connector (I2C-Bus) build the prototype of such a device in the blink of an eye, without having to make a single solder connection. All you have to do is program and this is certainly the crucial point of such a device to obtain reliable measurements. Maker hardware, like boards from the Arduino Universe or SparkFun, can allow developers with little hardware experience to prototype and play with new ideas.

Example of a Qwiic string

(Image: Sparkfun)

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