Handheld Development Kit (3.5")


The Handheld Development Kit (3.5") is a solutions kit for those prototyping handheld devices. This kit features the Alto35 expansion board and Overo AirSTORM-Y COM.

Handheld Development Kit (3.5") AccelerometerBluetoothCamera ConnectorLCDWiFi

Handheld Development Kit (3.5")

Featuring a 3.5” LCD touch screen, audio in/out, a 3D accelerometer, push-buttons, LEDs and more, this Gumstix 3.5” Handheld Development Kit has all the hardware you need to get started with your own handheld application.

At the heart of the system is a WiFi/Bluetooth-enabled Overo AirSTORM-Y computer-on-module.

This kit includes:

Included Components
Alto35 Expansion Board

This expansion board, built by Geppetto, uses our new line of 3.5" displays from In Touch, and includes accelerometer, audio jacks, RC Servo connections, LED's and pushbuttons.

3.5 inch In Touch TFT LCD with touch screen

3.5 inch In Touch TFT LCD with touch screen

5V US Power Adapter

5V power adapter for use in North America.

Overo System Card (Yocto 8GB)

8GB microSD card flashed with Yocto build Linux image


3D Accelerometer


Bluetooth 4.1 + BLE

Board-To-Board Connector

2 x 70-pin AVX connectors

Camera Connector

27-Pin (OMAP ISP)

Flash Memory (NAND)



17 mm


LCD Capable

LCD Manufacturer

Compatible with InTouch Displays

LCD Size

3.5 inch

LCD Touchscreen

Resistive Touch Ready


58 mm


Up to 2,000 Dhrystone MIPS


Powered via expansion board (Overo series or custom) connected to dual 70-pin connectors

Power Management

Texas Instruments TPS65950


Texas Instruments Sitara AM3703

Processor Architecture

ARM Cortex-A8

Processor Base Clock

1 GHz (Recommended @ 800MHz)

Processor Cores

Single Core

Processor Max Clock

1 GHz

Product Family



512 MB LPDDR (PoP)

Storage Expansion

via microSD Card Slot

USB Console Port


USB Device

1 x USB Mini-B (client mode only)



Key Components
RC Servo Connector

This 3-pin header allows an RC servo to be connected to the expansion board.

Texas Instruments TPS62111 Step-Down Converter

A low-noise synchronous step-down DC-DC converter. Component Max Vin: 17V, 1.5A.


Connect to an RS232 serial terminal over USB with the FTDI FT232RQ interface

ST LIS33DE 3-Axis Nano Accelerometer

An ultra-compact, low-power three-axis linear accelerometer providing signals over I²C.

U.FL Antenna with Collar

U.FL antenna with collar for Bluetooth and/or 802.11b/g/n wireless communications.

microSD Card Slot

An onboard card-slot for system storage expansion using microSD cards.

Texas Instruments TPS65950 Power Management

The TPS65950 device is a highly integrated power-management integrated circuit (IC) that supports the power and peripheral requirements of the OMAP3-driven Overo series COMs.

Micron 256MB DDR LPDRAM & 512MB NAND Flash Memory

Package-on-package (PoP) memory solution that minimizes power consumption, maximizes board space and increases speed.

Texas Instruments AM3703 Applications Processor

1GHz ARM Cortex-A8 Sitara AM3703 high-performance microprocessor designed to provide best in class ARM and graphics performance while delivering low power consumption. According to Texas Instruments, AM3703 is fully backward compatible with previous OMAP™ processors.

Mating Connectors
70-Pin AVX Connectors (Female – Overo Expansion)

Connect an Overo COM to an expansion board with these 70-pin AVX connectors.

U.FL Connector

Attach a U.FL Wi-Fi or Bluetooth antenna (not included) to a Gumstix system with this connector.

Hirose 27-Pin Camera Connector (Overo COMs)

Connect a Caspa camera to an Overo COM with this connector (Hirose FH26-27S-0.3SHW)

70-Pin AVX Connector (Male – Overo COMs)

Connect your Gumstix Overo COM to an expansion board with these 70-pin AVX connectors.


Please read the instructions in the README file carefully before starting. Instructions and functions are explained in the file.

Files that are needed (such as bootloader and operating system) to create a bootable disk image, are available below.

Our Support page links additional resources.

Software Version:

COVID-19 has affected our supply chain. Please expect delays on your orders while we do everything we can to fulfil them.