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Soldered Electronics
Microcontroller Boards

Inkplate 4 TEMPERA

An open, Arduino-compatible, 3.8-inch e-paper device with plenty of peripherals

$21,310 raised

of $10,000 goal

213% Funded! Order Below

Funding ended on Oct 26, 2023 at 04:59 PM PDT.

Recent Updates

You'll be notified about news and stock updates for this project.

Inkplate 4 TEMPERA is an easy-to-use, all-in-one device that puts the power of e-paper technology in the palm of your hand. Behind its 3.8-inch, 600x600-pixel e-paper touchscreen, it packs the following features into one compact, elegant package: frontlighting, an abundance of sensors, Wi-Fi and Bluetooth connectivity, a built-in battery, and a low-power operating mode.

In this digital age, screens are the windows through which we interact with much of our world, and e-paper technology addresses many of the challenges posed by conventional screens. More specifically, they offer high contrast, daylight readability, and unparalleled energy efficiency. And there is one more thing that sets our screens apart: sustainability. Every Inkplate 4 TEMPERA gives new life to an ED038TH2 E Ink display that we’ve rescued from a tragic future as e-waste. We’d rather see these screens in your hands than in a landfill.

So, if you’re in the market for a nice-looking screen on which you can display whatever you want—wherever, at whatever time of day, and for however long you want—we invite you to check out Inkplate 4 TEMPERA. We think you’ll find it delightful!

Limited Availability

These e-paper screens were originally made by the E Ink Corporation for a now-discontinued product and are available in limited quantities. As a result, we will only be able to manufacture 370 units with the glass panel and 300 units without. We currently have no plans to resume production after this run.

Two Inkplate 4 TEMPERA models, one with a glass panel and one with a plastic cover

A Symphony of Features

Inkplate 4 TEMPERA is powered by the ESP32 microcontroller, to which we’ve added all of the peripherals we thought you might find useful. Inside the enclosure is a 1200-mAh battery and power-management circuitry so you can charge it easily and determine its remaining charge accurately. Inkplate 4 TEMPERA’s real-time clock (RTC) allows for precise time measurements, and its microSD card slot allows you to to store and display images, among other applications. If you’re looking for sensors, you’ll find a gyroscope and an accelerometer, as well as temperature, humidity, air quality, and gesture sensors. Inkplate 4 TEMPERA also has a built-in, frequency-adjustable buzzer. And of course, it includes various GPIO pins that support peripheral connectivity through a GPIO expander or via the easyC ecosystem.

Unparalleled Simplicity

Many e-paper screens are challenging to work with, but we’ve designed Inkplate 4 TEMPERA to be user friendly. Simply connect it to your computer with the provided USB cable, and it’s ready to go. No complex setup or tedious configuration are required. And it’s just as straightforward on the software side: Inkplate 4 TEMPERA supports Arduino and MicroPython out of the box and has community support for ESPHome. Our Arduino library, in particular, contains numerous examples and project ideas. All you need are a few lines of code to change what’s displayed on the screen. And finally, Peripheral mode allows you to send commands to modify screen content via UART. We load peripheral-mode firmware onto all Inkplates before we ship them out.

Our comprehensive Inkplate documentation is readily available online, and we extend free technical support to all Inkplate customers via email.

Features & Specifications


Other Key Electronic Components





Components & Layout




What Can I Do With It?

You could build an interactive calendar, track your stocks, make a digital picture frame, display the weather report, or use your Inkplate 4 TEMPERA as a sensor dashboard, to name just a few examples. More generally, you could turn it into:

The beauty of Inkplate 4 TEMPERA lies in its adaptability. All you need is the right idea and a bit of coding. Beyond that, the list of possible applications is limited only by your imagination.


Inkplate 4 TEMPERAInkplate 6Inkplate 10Waveshare EPDAdafruit EPDPimoroni Inky wHAT
Screen Size 3.8" 6" 9.7" 9.7" 2.13" 4.2"
Resolution600 x 600 800 x 600 1200 x 825 1200 x 825 250 x 122 400 x 300
All-in-one BoardYes Yes Yes Requires controller & two add-ons Requires controller Requires controller
Low-Power Mode18 μA 25 μA 22 μA No No No
Wi-FiYes Yes Yes No No No
Touchscreen & Screen LightingYes No No No No No
Battery Charger and BatteryYes Charger only Charger only No No No
Battery Fuel GaugeYes No No No No No
Accelerometer and gyroscopeYes No No No No No
T, Rh and Air Quality SensingYes No No No No No
Gesture SensingYes No No No No No
Sound OutputYes No No No No No
Real Time ClockYes Yes Yes No No No
MicroSD slotYes Yes Yes No Yes No
GrayscaleYes Yes Yes Yes No No
Partial UpdateYes Yes Yes No No No
Refresh Time0.86 s 1.26 s 1.61 s ~6 s ~2 s ~10 s
Refresh Time per Pixel2.39 μs 2.63 μs 1.62 μs ~24 μs ~66 μs ~83 μs
Partial refresh Time0.18 s 0.25 s 0.33 s Not supported Not supported Not supported
Price$149 $149 $169 $173 $22.5 $63

The Inkplate Legacy

The Inkplate family owes a lot to our incredible community of backers. Inkplate 4 TEMPERA is the latest addition to that family, and it joins a number of crowdfunding campaigns that hit their goals and shipped successfully. Those include Inkplate 6, Inkplate 10, Inkplate 6PLUS, Inkplate 6COLOR, and Inkplate 5. Various Inkplate boards have been produced in total quantities of over 8000 pieces and delivered to customers in over 80 countries.

Support & Documentation

You can find our documentation online or email us with questions. You can also reach out using the "Ask a technical question" link below.

Every aspect of Inkplate 4 TEMPERA is, or will soon be, fully open source. That includes:

All design files will be made publicly available before we start shipping to backers.

Manufacturing Plan

All aspects of Inkplate 4 TEMPERA’s development, from design to manufacturing, are handled in-house in our Croatian factory. We oversee every stage of production to ensure the highest quality of our products. Our team, equipped with years of experience and a robust manufacturing line, is prepared to handle large production runs.

Fulfillment & Logistics

After our production run is complete, we will box everything up and send it along to Crowd Supply’s fulfillment partner, Mouser Electronics, who will handle distribution to backers worldwide. You can learn more about Crowd Supply’s fulfillment service under Ordering, Paying, and Shipping in their guide.

Risks & Challenges

As with any hardware product, there are inherent risks and challenges associated with production and supply-chain management. We’ve learned from past experience and established strong relationships with suppliers and manufacturers to mitigate these risks. While we have a strong record of delivering quality products on time, we understand that unforeseen circumstances can occur. Inkplate 4 TEMPERA has undergone rigorous testing, and we have identified primary and backup suppliers for all components. Should any issues arise, we will leverage our experience and resources to mitigate delays and keep our backers informed at every step.

About Soldered Electronics

We’re Soldered Electronics, a team dedicated to designing and manufacturing top-notch electronic products for hobbyists, educators, and professionals. Our commitment to quality, customer satisfaction, and open-source principles is reflected in every product we make, which is evident in our customer ratings. We’ve successfully delivered multiple crowdfunded products and are excited to bring Inkplate 4 TEMPERA to you. You can read more about us here.

In the Press

Good E-Reader

"A nice thing with the display is that those happen to be repurposed ED038TH2 E Ink displays, which means a lot of e-paper displays that are saved from being turned into e-waste. "

CNX Software

"[Inkplate 4 TEMPERA] should be quite versatile to create all sorts of projects that would benefit from a small ePaper display."

Geeky Gadgets

"The Inkplate 4 TEMPERA is a compact, all-in-one e-paper device that has been making waves in the tech world."

Produced by Soldered Electronics in Osijek, Croatia.

Sold and shipped by Crowd Supply.

Inkplate 4 TEMPERA With Glass Panel

ESP32-based MCU board with a 3.8-inch, e-paper touchscreen, a glass panel, built-in lighting, a Li-Ion battery, an enclosure, and various peripherals.

$169 $8 US Shipping / $18 Worldwide

Want to buy this item? Check the current project page for the latest information.

Inkplate 4 TEMPERA With Plastic Cover

ESP32-based microcontroller board with a 3.8-inch, e-paper touchscreen, built-in lighting, a Li-Ion battery, an enclosure, and various peripherals.

$149 $8 US Shipping / $18 Worldwide

Want to buy this item? Check the current project page for the latest information.

About the Team

Soldered Electronics

Osijek, Croatia  ·   solderedcom  ·   solderedelectronics  ·

At Soldered Electronics, we craft custom electronic products for everyone from hobbyists to industry pros. Dive into our selection of electronic boards, sensors, and actuators—essential tools in realms like microelectronics, mechatronics, robotics, programming, and IoT. Every piece we sell is a product of our own design, grounded in open-source hardware and software.

See Also

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