Custom Tablet for Photographers – Case Study

Project Scope

Design a tablet for photographers to quickly review their shots and copy photos from the camera’s memory card to a spare card.

Use Cases

Photographers want to quickly review photos on a clear and large screen then move images off their camera’s memory card so they can get back to taking photos again.  Hatch’s client identified this unique market and turned to Hatch to manufacture a custom Android tablet tailored to serve it.

Hardware and Mechanical Requirements

  • 9” Screen
  • No Wireless Connectivity (mobile data, Wi-Fi, Bluetooth, etc)
  • Two Full Size SD Card Slots
  • Large 4000mAh Battery
  • Custom Protective Case

Hatch’s Responsibilities (Learn more about Android Development Service)

  • Custom Android firmware programming
  • Custom PCBA design
  • Reference design modification to add extra SD card slot
  • Assistance with Industrial Design
  • Mechanical Engineering
  • Creating prototypes
  • Tooling for device case
  • Manufacturing process optimization
  • Create finished product testing procedure
  • Trial and Mass Productions

Time Frame

This project moved fairly quickly from Hatch’s end.  Two months passed from kickoff to initial prototype.  The customer took a few months to thoroughly test the initial prototype, which is time well spent.  Another month was used to refine aspects of the firmware in parallel with producing the tooling for the tablet’s casing.  Trial production took a month and then the customer needed extra time to refine and debug their app.  The whole process took about 8 months, but most of this time was used for app related development and optimizations.

How it Happened 

The client initially approached Hatch about working together when they first started conceptualizing the project around 2017.  At that time, as a new company and concept, they couldn’t commit to Hatch’s minimum order quantity.  We wished them good luck and ended the discussion.  They came across another tablet supplier who said all the right things, won the business and then forced the client to place a large order (which they weren’t ready for) or lose their deposit.  If everything went well that’s where the story would have ended, but after deceptive business practices the other supplier also shipped bad products and were difficult to work with.  At that point the customer contacted Hatch again and asked for help with getting out of their dilemma.  Typically we don’t get involved with this kind of situation, but the client seemed like good people in a bad position.  We agreed to help them fix the problems and manage production for the rest of their order from the first supplier before redeveloping the product ourselves.

As the first order was coming to an end Hatch started to redevelop and improve the product.  Hatch had the benefit of learning from the mistakes of the first development, which helped our development go smoothly and make the customer experience even better.

The device had several custom hardware requirements that deviated from the standard reference design, the electronics design which ‘off the shelf’ Android tablets are based on.  For example, remove Wi-Fi, Bluetooth, cameras, headphone jack, unnecessary apps, and increase battery size.  Also Hatch needed to add a second memory card slot and make both memory cards full size SD, while the reference design calls for one MicroSD size memory card.  Most of these hardware customizations also required related firmware modifications.

Second SD memory card slot for copying photos.


The results were great.  A large part of the success came from the lessons learned from the first generation of the product.  Our client was able to earn a reputation for higher customer satisfaction than the competition (in their niche) thanks to the great job they did with redesigning their app and the improvements Hatch made to the hardware and firmware.  This allowed them to raise the retail price, helpful in offsetting the high costs of fixing problems with their first generation product.

It’s hard to predict how things go in business, but some situations create good stories when told in retrospect.  Sometimes, for whatever reason, people don’t connect with potential friends/customers/whatever on the first interaction, but a relationship develops in the future.  This client has turned out to be a great company to work with and Hatch provided key value to them.  Often companies contact us who aren’t ready to work with Hatch when they first reach out.  I try to guide them in the best direction for them rather than sell them services they’re not ready for.  Hopefully my guidance or something else they did brought success.  It’s always a pleasure to see companies flourish and become able to help them.

Best CPUs for Custom Android Tablets Q4 2020

Since the explosion of Android tablets started almost 10 years ago several CPU (central processor unit) manufacturers have come and gone.  In the beginning high profit and high volume drew companies into the space, but as the volume of Wi-Fi Android tablets dropped and competition grew a few clear leaders have emerged.  Those leaders include Rockchip, Mediatek (which also makes CPUs for telecom tablets and smartphones), and Allwinner Tech.  These companies all make chips based on the ARM architecture, so many of their chips compete head to head and are fairly similar in spec and performance.

To keep it simple this article will focus on Rockchip since Hatch routinely uses their CPUs.  The main reason we use more Rockchip is due to flexible customizations (important when making custom Android devices), engineering support, and because we have stronger relationships with Rockchip engineers.  The other companies also make high quality Android CPUs that work for custom projects and we are supportive of using them if our customer requests.

The list below provides information about the leading Rockchip CPUs that are recommended for use in custom Android Wi-Fi devices in order of performance, from high to low end.


The RK3399Pro is called a ‘server level’ CPU.  It’s mainly intended for use in applications that demand high performance such as an Edge AI server, industrial applications, client-side facial recognition, and others of this nature.

The CPU contains 6 (hexa) ARM cores, consisting of 2 Cortex-A72 (1.8GHz) and 4 Cortex-A53 (1.5GHz), a NEON coprocessor, Mali T864 GPU, and an NPU.  It can run multiple learning platforms such as Caffe and Tensor Flow.  The RK3399Pro supports multiple display outputs up to 4k resolution and multiple camera inputs up to 13MP. It also has native support for USB type-C protocol.

(Before the RK3399Pro came the RK3399.  The RK3399Pro is the RK3399 with the integration of the RK1808 IC.  The RK1808 provides the NPU (neural network processor unit) mentioned above.)



The RK3288 is a high end Android CPU that features excellent display support and strong processing power.  This chip is used in a range of consumer, business, and industrial devices.  Many large screen advertising displays use this chip.  Applications include live video streaming with add-on electronics (like temperature sensor), laptops, and access control terminals.

The CPU contains 4 (quad) ARM Cortex-A17 cores that deliver speed up to 1.8GHz and a Mali T764 GPU.  It supports up to 4k display resolution, dual display output, and dual camera up to 13MP (with internal ISP).



The RK3368 is similar to the RK3288 with slightly lower specs. It still offers excellent multimedia features and does a great job in high level consumer or business applications. The RK3368 is commonly used for educational tablets, TV boxes, advertising displays, and premium tablets.

This CPU has an 8 (octacore) architecture with 8 Cortex-A53 cores that run up to 1.5GHz. It supports up to 4k video HDMI output powered by a PowerVR G6110 GPU. The internal ISP supports 1080p recording and up to 8MP images.



The RK3326 is a mid-range CPU that has become popular with devices like retail tablets and smart speakers that have moderate performance requirements and need the newest technologies. The chip is a step up from the RK3128 in that it provides faster processing speed and an internal ISP for image processing.

This CPU has a 4 (quad) core Cortex-A35 processor that runs up to 1.5GHz. The Mali-G31MP2 GPU delivers video output up to 1080p resolution. The internal ISP supports video up to 1080p resolution and images up to 8MP.



The RK3128 is the entry level CPU intended for mass market consumer level devices. Its high volume ensures stable functionality and reliable performance in tablets and TV boxes for lower resolution displays. It’s a solid option for custom Android devices that need long battery life with limited functionality.

This CPU has 4 (quad) Cortex-A7 cores running up to 1.2GHz. It integrates a Mali-400MP2 GPU that provides video output up to 1080p resolution. The CPU also supports cameras with recording up to 1080p and images up to 5MP.

Some CPUs have multiple versions that offer slightly different features.  For example, the RK3128 and RK3126c are exactly the same CPU, but only the RK3128 has HDMI connectivity and supports DDR2.  For products that don’t leverage the full features of a CPU using the ‘cost down’ version (like the RK3126c) saves cost on the BOM (bill of materials).  Once the requirements of a product are clearly defined with a client Hatch will help to accurately identify the most suitable chip to use.