MicroTouch

Touchscreen Integration

Tips and Techniques

MicroTouch On the MoveMicroTouch On the Move

Paul Hatin & Mark Roberts

Touch Sensor ConstructionTouch Sensor Construction

GlassPanel

Anti-Glare

ConductiveTouchCoating

ClearTekOvercoat

RearShieldCoating

Electrodes

Glass panel

Anti-Glare

Touch coatings

Front, rear

Electrodes

ClearTek Overcoat

MicroTouch Capacitive MicroTouch Capacitive Sensor TechnologySensor Technology

Voltage is applied to 4 corners.

Special electrodes linearizethe voltage fie ld

Current flow from 4 corners is measuredand position is calculated

MicroTouch Controller MicroTouch Controller TechnologyTechnology

• Power– +12 volts supplied through

orange wire

• Touch working– Tap the Touchscreen, LED

should flash

• Communications with System– Power on system, should find

the controller– If not, turn power off– unplug the Touchscreen– power back up

Materials and ToolsMaterials and Tools

• Recommended Materials– Double Sided Tape (touchscreen - display)

• 3M 4416 (1/16” thick) 8 pieces (1.5” long)• 3M 4408 (1/8” thick) 8 pieces (1.5”long)

– Closed cell single sided Gasket (bezel - touchscreen)• Volara 2AF• Epilon FR

– Cloth Tape• Ideal Brand Therm-X No. 724

• Tools– Isopropyl Alcohol– Lint free cloth– X-acto Knife

Removing the TouchscreenRemoving the Touchscreen

• Peel away gap tape• Use X-acto knife to cut

foam tape from top, left, right sides from the outside edge

• Lean Touchscreen forward & cut bottom tape from between Touchscreen and Display.

Preparing Display & TouchscreenPreparing Display & Touchscreen

• Use Isopropyl Alcohol and soft lint free cloth

• Clean the surface of the Display

• Clean the inside surface of the Touchscreen

Alignment of the TouchscreenAlignment of the Touchscreen

• Align the Touchscreen

• both horizontally and• vertically with the• tube/LCD

Cover the air gapCover the air gap

• Use the Black Cloth tape

• Cover the perimeter of the Touchscreen fully covering the space between the Touchscreen and Display

Preparing Power for the Preparing Power for the ControllerController

• Orange - +12v, 60ma max, 47 ma typ, 400 mv max ripple

• Gray - Power Supply Ground

• Green - Chassis Ground, as short as possible

• Gray/Green - Can be combined to Chassis Ground