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Arduino Powered Espresso Machine Temperature Monitor

Frans Goddijn used an Adafruit RGB LCD Arduino Shield and a MAX31855 Thermocouple Amplifier to monitor the temperature of his espresso machine.

How nice that Adafruit prints some basic info on the back side of the stamp-sized MAX31855. I first soldered on the blue unit that takes the K-type temperature probe. Next, the comb of pins that will have 5V and ground and the other connections with the Arduino board: one line for the Arduino to beat the time for all activity on our little blue island, one for the Arduino board to tell MAX when to check the temperature probe and report what it says and one data line to hand in the reports to Arduino.

Wired up, time to hook it up. The probe strapped to the hot brew group of the Ponte Vecchio Lusso 2 espresso machine. The circuit reports room temperature (well it’s actually the internal temperature of the chip living on the blue MAX island but over there it’s about as warm as it is here) and the temp on the tip of the probe. Next, I could send it over to the laptop using a network connection, or save a lot of data on a memory chip to analyze on the computer later and turn into graphics, noticing any dips and spikes during espresso making or trends along the day, warmup and cooling wave forms.

Pick up the Adafruit RGB LCD Arduino Shield Kit here, and the Thermocouple Amplifier MAX31855 breakout board here.


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