was successfully added to your cart.
Category

Design

Corvo EKG Electric Tea Kettle

What’s The Point of A PID Controller In An Electric Kettle?

By | Coffee, Design

Minimal and modern with a single button and a sleek LCD screen, Stagg EKG and Corvo EKG’s base is hiding something very powerful inside: a PID controller. A proportional-integral-derivative controller is a control loop feedback mechanism widely used in industrial control systems. The PID controller continuously calculates an error value as the difference between a desired setpoint and a measured process variable and applies a correction based on proportional, integral, and derivative terms which give the controller its name.1  Or in much simpler terms, EKG’s PID controller is basically a mathlete with a TI-84 calculator constantly running equations to determine the most efficient way to reach your goal temperature.

“An everyday example is the cruise control on a road vehicle; where external influences such as gradients would cause speed changes, and the driver has the ability to alter the desired set speed. The PID algorithm restores the actual speed to the desired speed in the optimum way, without delay or overshoot, by controlling the power output of the vehicle’s engine.”2 Well before cruise control, the original application of PID controllers was for the automatic steering systems for ships in the early 1920s. So if you ever want to drop an impressive factoid while brewing up a pour-over, you can say your Stagg EKG or Corvo EKG has the same technology as ocean liners.

If your electric kettle has a traditional thermostat, it heats up by overshooting the goal temperature, and then it drops below the goal temperature to cool off. All kettles (that we’re aware of) have a simple on/off controller. So, the power is either at 100% or 0%. Again it overshoots, undershoots, overshoots, and undershoots until it gets close to the goal temperature. Charted on a graph, it would look like spiking zig zag lines or the stock market crashing and rebounding day after day. This is not efficient and in reality, your “hold” is just holding at a degree or two below and above, flipping back and forth.

Now onto the EKG family and the two reasons EKG outperforms everything else on the market. First, Stagg EKG and Corvo EKG use a PID controller (much like your fancy $20,000 espresso machines), so the zig zags are less drastic and resemble a curve leveling off at your goal temperature. This lends itself to a more accurate output. In addition, those other kettles just have on/off mechanical relays (remember from above, either 100% or 0% power). Fellow’s EKG line is able to do a little something called “Pulse Width Modulation” using a non-mechanical approach. PWM uses series of on/off pulses to vary the duty cycle, the fraction of time that the output voltage is “on” compared to when it is “off.” This PWM action allows us to maintain temp much more accurate compared to a standard mechanical relay that is clicking on and off around the set point. Oh, and that also means Stagg EKG doesn’t have that annoying mechanical on/off click that drives baristas crazy.

Okay okay… so what does this mean in terms of actual performance? After running countless tests, we can say with confidence that the EKG family’s PID controller heats and maintains water temperature to +/- .3 degrees Celsius. This is three to four times more accurate than the leading electric pour-over kettle available on the market today. In one series of tests, we compared Stagg EKG to the leading variable temp pour-over kettle (to be nice, we won’t name names).

The test: 600 ml of water set to hold at 200°F.

Although both kettles have an average temperature of essentially 200°F over the course of testing duration (averages can be misleading), the standard deviations tell a very different story. Stagg EKG has a standard deviation of 0.27°F while the leading pour-over kettle comes in at 1.06°F.

As you can see from the plot, Stagg EKG is bouncing between about 199.5°F and 200.5°F (blue line), while the leading pour-over kettle ranges from a low of below 198°F and a high of over 201.5°F (red line). The competitor kettle turns on (100%) overshoots the set point, then shuts off (0%). The water cools down to 198°F and then the kettle clicks back on (100%). The result is relatively drastic swings in temperature even though you’re technically in hold mold. Stagg EKG, through PID and PWM is able to do micro adjustments that make it hold temp three times more accurate in this experiment.

Stagg EKG vs. Leading Variable Temp Pour-Over KettleWhy should the inner-workings of an electric kettle matter to you? The fourth wave of coffee has been forecasted as “the science of coffee.” As we learn more about coffee, users seek more resolution on their brewing parameters as seen in many third wave shops employing techniques such as Total Dissolved Solids, brewing by weight, and using coffee brewing smart technology. Stagg EKG and Corvo EKG provide users the ability to manipulate temperatures with to-the-degree precision to easily control the brewing temperature. This empowers users to experiment and explore all the varying degrees of extraction for coffee and tea. Both Stagg EKG and now our latest product, Corvo EKG, have a brew range of 104°F to 212°F (40°C-100°), can hold the set temperature for 60 minutes, and most importantly, are the most accurate variable temperature electric kettles on the market.

Corvo EKG Electric Tea KettleStagg EKG Electric Pour-Over Kettle

 

 

 

 

 

 

 

 

 

Design Month | June Featured Roasters

By | Design, Featured Roaster

To tell you why we at Fellow have decided June is “Design Month,” we first have to tell you about San Francisco Design Week!  SF Design Week is an annual gathering of great minds and hands and eyes and imaginations to showcase the latest and greatest in design innovation from all over the world.

Over the last decade, packaging in the specialty coffee industry has become something of an art with the challenge of balancing form, functionality, and originality. Will it keep my coffee nice and fresh? Is it compostable? Informative? Does it look fly on my kitchen counter?

When we take these things into consideration, it’s easy to see why design is so integral and important to the way we experience almost everything in our daily lives from our shoes to our phones to our toothbrushes to our coffee.

To celebrate design with the rest of our city, we have carefully selected some of the finest examples of coffee packaging in the whole industry. We hope you’ll enjoy these gems!

TALOR&JØRGEN
Oslo, Norway | Founded in 2015 by Talor Browne and Jørgen Hansrud

Fun Fact: Before Talor&Jørgen, Jørgen founded a start-up in 2014 called Epic Win Movement to empower young people to learn practical skills to facilitate their projects. Talor boasts a robust coffee career spanning from companies like St. Ali, Barista Hustle, Coutume, and Tim Wendelboe, as well as being a Q Grader.

Talor&Jorgen Fellow June Featured RoastersCoffee/Origin: Rwanda Nyamasheke
Variety: Red Bourbon
Process: Washed
Notes: Vibrant, Raspberry, Vanilla

“This coffee from Mahembe is unique in many ways. Justin the owner is unusual in his commitments to improving his operating and to processing some of the best coffees coming out of Rwanda. Mahembe is a privately owned washing station owned by Justin Musabyiama, who is also growing his own coffee trees. Justin has grown up in the local area and after moving away for some time, decided to come back home and invest in the community he was from by building a wet mill on his father’s coffee plantation.” – Talor&Jørgen (@talorjorgen)

Shop this coffee!

CITY OF SAINTS COFFEE ROASTERS
Brooklyn, New York | Founded in 2014 by Joe Palozzi and Matt Wade

Fun Fact: City of Saints’ café/ roastery is neighbors with a small art gallery with whom they collaborate frequently, contributing to their eclectic and vibrant aesthetic.

City of Saints Coffee Roasters Fellow June Featured RoastersCoffee/Origin: Ethiopia Germa Eshetu
Variety: Heirloom
Process: Washed
Notes: Peach, Agave, Arnold Palmer

“Girma Eshetu is an undeniably badass human being. We knew this before we met him, from the story of how he wound up living and farming in the region he is today, a story that starts in a beer brewery, takes us through a self-funded Masters in Mechanical Engineering, and ends in what Girma believes is his ancestral homeland – fittingly shared with the purported birthplace of coffee itself.

The spiel certainly sets you up to expect a dazzling dude. But meeting Girma sealed the deal – impeccably dressed in pink stripes and a Panama hat, with beer bottles as seeming extensions of his fingers. This is a man who takes tremendous pride in producing phenomenal coffee, and always keeps his sights on improvement. Before embarking on the several hour horseback ride to his Estate, we met at a washing station he constructed for processing community lots. Here, he enthusiastically flaunted his water filtration system by drinking the very water he’d be using to wash the coffee, cupping it in his hand and slurping it up with giddy pride. When we sip Girma’s coffee ourselves, it’s hard not to emulate that excitement. Characterized by vibrant, shimmering brightness and a refreshingly silky mouthfeel, this coffee is a treat anytime, but is perfectly suited for summer.” – City of Saints Coffee Roasters (@cityofsaintscoffee)

Shop this coffee!

METHODICAL COFFEE ROASTERS
Greenville, South Carolina | Founded in 2015 by Will Shurtz, David Baker, and Marco Suarez

Fun Fact: Will started serving coffee from his mobile cart called Vagabond Coffee when he was only 18!

Methodical Coffee Roasters Fellow June Featured RoastersCoffee/Origin: Honduras “Santa Barbara”
Variety: Red Catuai
Process: Washed
Notes: Milk Chocolate, Stone Fruit, Nutty Finish

“Since 2005, the region of Santa Barbara and the small producers living and working there have shared the distinction as the place and the people producing exceptional coffee within Honduras. Our work and the beginning of the on-going relationships we’ve since established here began during the 2005 Cup of Excellence. We came to realize that there are exceptional producers from this small area. And since that inaugural year, we have purchased from over twenty different Santa Barbara producers.

Located in the village of Pena Blanca is coffee exporter San Vicente – the company that coordinates the coffee we buy from Santa Barbara. Over the past several years, one particular hillside has become the largest supplier of CoE winners in Honduras. The most successful farms with the smartest and most innovative farmers are neighbors on the hillsides of this region and they help each other to refine the best of their lots.” – Methodical Coffee Roasters (@methodicalcoffee)

Shop this coffee!

BRANDYWINE COFFEE ROASTERS
Wilmington, Delaware | Founded in 2013 by Todd Purse

Fun Fact: All of Brandywine’s bags are stamped and screen printed by hand with original designs by Todd himself!

Brandywine Coffee Roasters Fellow June Featured RoasterCoffee/Origin: Panama Elida Estate
Variety: Catuai
Process: Natural
Notes: Grape, Elderberry, Kiwi

“The Lamastus Family has being producing coffee in Elida Estate for four generations since 1918. Elida Estate coffees are produced under a unique world-ecological condition. It is shade-grown, bird friendly, and the farm is located at a very high elevation in a micro climate with very low temperatures. The coffee trees are surrounded by the Volcan Baru National Park, a virgin native cloudy rain forest.

At the turn of the century Kentucky born Robert Lamastus started an Arabica coffee plantation in a farm located at around 5,600 ft (1,700 m) above sea level in the skirts of the Baru Volcano in Boquete, Panama. At the time our grandfather processed and exported what is still today considered as one of the highest quality coffees in the world. Nowadays and three generations later, the tradition continues. The Lamastus family still produces, processes, exports, and now roast its own rare estate coffees.” – Brandywine Coffee Roasters (@brandywinecoffeeroasters)

Shop this coffee!

ELIXR COFFEE ROASTERS
Philadelphia, PA | Founded in 2010 by Evan Inatome

Fun Fact: Elixr’s newest roastery/café facility offers an “Omakase” style, where guests can receive a specially curated flight of their special offerings!

Elixr Coffee Fellow June Featured RoastersCoffee/Origin: Colombia “Suarez”
Variety: Caturra, Castillo
Process: Washed
Notes: Bruleed Sugar, White Grape, Birch Beer

“For the second year in a row, we are proud to present Suárez from the Cauca region of Colombia. We first came across this coffee at the best of Cauca competition two years ago. This year’s crop offers the same deep sweetness, and complexity as we remembered. With tasting notes of bruleed sugar, white grape, and birch beer, this coffee is one of those easy drinking sweet and enjoyable cups!” – Elixr Coffee Roasters (@elixrcoffee)

Shop this coffee!

While these five eye-candy coffees have taken up residency on our Featured Roasters wall this month, that’s not the only SF Design Week fun Fellow is having. On June 15, the Fellow Store + Playground is along the route for SF Design Week’s Studio Crawl for Dogpatch, Mission, and Potrero. Grab your tickets before they sell out because…the first 70 people to visit Fellow will get a tote bag screen printed by an artist live at our event!

Stagg EKG+ Production Update

By | Coffee, Design

 

After a couple of months of frustration, we finally had a great week:) All Kickstarter and website pre-order Stagg EKG+ units were successfully assembled and tested. Each and every unit produced was connected to BlueTooth and each unit was brought to a boil to confirm functionality. In addition, we hired an independent third party testing agency to randomly sample a subset of units and the agency provided our team with a pre-shipment inspection report. Everything is looking good.

What’s next?

Yesterday the Stagg EKG+ units were loaded into a 40′ sea container at our factory and the container was transported via semi-truck to the loading area for the shipping container. The ship was set to sail on February 11th with an estimated arrival date of March 9th at the Port of Oakland. We can’t tell you how relieved we are to get these units our before Chinese New Year. Our factory shuts down today and won’t be operational again until early March!

Once the units arrive in Oakland we’ll schedule a pick-up and deliver to our warehouse in Oakland, California. Typically, we are able to pick-up a container a couple days after arrival. As soon as we get the units into our warehouse we’ll start the shipping process out to you! We’ve already purchased shipping boxes and supplies in advance. So, this means the first packages will be shipped out the week of March 12th (or 1-2 days after we are able to pull the container). Obviously things can happen that would delay this date (i.e., customs flagging the container for inspection), but we’re optimistic we can stick to this schedule.

All of use here can’t wait to deliver Stagg EKG+ to all of you — our backers and early supporters. Thank you for patiently waiting…. we’re confident the wait will be worth it!

Jake and the Fellow Team

Stagg EKG+ Production Update: It’s Go Time!

By | Design

Be honest. You’ve seen seen Stagg EKG on Instagram feeds for the past three months, shaken a fist at the screen, and said, “Grrrr…Fellow, where’s my EKG+?” Trust us, the EKG+ delay stung— we wanted to ship it out just as badly as you wanted to receive it. Unfortunately, the last checkboxes to be checked came down to safety regulations, and they were out of our control. Sometimes we wanted to shake our fist at the screen and say, “Grrr…safety, who needs you?” But alas, we drank a cup of coffee, calmed down, and realized safety is very much needed.

We spent the holidays away from home and our families in China and Taiwan to ensure we were making progress every single day. I was there for 10 days at the end of December while our other engineer, Neil, spent seven days in the factory in early December. The first hold-up we were working through was a product modification for the EKG+ to pass the safety certification. This was the addition of an “enable/disable” feature for Bluetooth as required for ETL product certification by Intertek (the governing body for electronic product safety). We’re happy to say this feature was recently completed (thankfully achieved through a menu in software and not as an additional switch), and EKG+ was re-submitted for ETL certification. Read More

WHY DOUBLE WALL INSULATION?

By | Coffee, Design


Here at Fellow, we obsess over temperature and understand how important it is for brewing coffee. That’s why we created two pour-over drippers, Stagg [X] and Stagg [XF] with vacuum insulated double wall stainless steel to help reduce temperature loss during your brew. Obsessive? Yes. Excessive? No.

The thinking: the more control you have over temperature, the more control you have over your extraction.

But how does our double wall insulated stainless steel dripper actually stack up to competing drippers? We’ve run a series of tests comparing Stagg [XF] Dripper to other popular coffee drippers. For the sake of consistency and accuracy, we focused on testing Stagg [XF] versus flat bottom single wall stainless steel drippers. Here’s what we found:

Read More

EKG+ Production Update

By | Coffee, Design

 

Hello Fellow pre-order supporters!

As you’ve likely seen, we have started to ship Stagg EKG units (the non-BlueTooth version) to Kickstarter Backers. As you know, the EKG+ units were not in the same container. Although we did expect about a month difference between the two units, we didn’t forecast many of the challenges we’re currently facing.

Read More

Prismo AeroPress Coffee Maker Attachment

Prismo – Production Status Update

By | Coffee, Design


Hello, passionate Prismo-ites! First, a big thank you -without your pre-order support, Prismo would be but a blip on our Fellow idea board. We’re overwhlemed by the positive response for Prismo, and can’t wait to ship them to you.

However, although Prismo has superpowers, we do not, and thus, production has been moving at normal human speed. That being said, we have a Prismo timing update and the news is good-ish. It could be better. But it could also be much worse, so we’re feeling positive. Read More

Stagg EKG – Cafe Testing

By | Bay Area, Coffee, Design

 

As we enter the final stretch of production tweaks for Stagg EKG, we’ve released a select few EKG prototypes into the wild. This gives us a chance to gain incredibly valuable feedback from both at home users and baristas on what they like, and what we can still improve upon. Although our La Marzocco user testing in Seattle is complete, you can still catch a sneak peek of EKG in Santa Cruz, or San Francisco at these cafes: Read More

Prismo: Superpowers for your AeroPress®

By | Coffee, Design

 


Meet Prismo, an AeroPress® attachment that unlocks espresso-style coffee without an espresso machine.

We here at Fellow love espresso, but sometimes we don’t have access to a good espresso machine, and the team is left to walk to the nearest coffee shop. Since we’re a coffee product company (and that coffee shop is over a mile away), we figured we should probably solve this problem. Read More

Privacy Preference Center

Close your account?

Your account will be closed and all data will be permanently deleted and cannot be recovered. Are you sure?