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www.qprox.com
E411
User Manual
The New Vision of TouchTM
Contents
E411 User Manual
1 E411 Overview........................................................................................................................3
1.1 Introduction ....................................................................................................................................................................................3
1.2 Contents of Kit ...............................................................................................................................................................................3
2 Mounting the Spare E411 Board ...........................................................................................4
3 Setting Up the E411 ...............................................................................................................5
4 QSlide .....................................................................................................................................6
4.1 Introduction ....................................................................................................................................................................................6
4.2 How to Use the E411 Assembly ....................................................................................................................................................6
4.3 QSlide Parameters.........................................................................................................................................................................7
5 E411 Assembly Details ..........................................................................................................8
5.1 Circuit Diagram ..............................................................................................................................................................................8
5.2 E411 Assembly Components.........................................................................................................................................................9
6 Troubleshooting...................................................................................................................11
List of Figures
Figure 1: Evaluation Assembly and USB-SPI Adapter Card............................................................................................................................................3
Figure 2: Mounting the Spare E411 Board.......................................................................................................................................................................4
Figure 3: E411 and USB Connectors ...............................................................................................................................................................................5
Figure 4: QSlide Information Areas ..................................................................................................................................................................................6
Figure 5: E411 Circuit Diagram ........................................................................................................................................................................................8
Figure 6: E411 and USB-SPI Adapter Card Assembly Details ........................................................................................................................................9
List of Tables
Table 1: J1, SPI Interface Connector ...............................................................................................................................................................................9
Table 2: U1 (QT411 IC) ..................................................................................................................................................................................................10
Corporate Headquarters North America
1 Mitchell Point
Ensign Way, Hamble
Southampton SO31 4RF
United Kingdom
Tel +44 (0)23 8056 5600
Fax +44 (0)23 8045 3939
651 Holiday Drive Bldg. 5 / 300
Pittsburgh, PA 15220
USA
Tel 412-391-7367
Fax 412-291-1015
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E411 User Manual
1 E411 Overview
1.1 Introduction
This kit is designed for the evaluation and development of applications using the QT411-ISSG
QSlide™ IC. The kit includes an evaluation assembly (E411 – see Figure 1), cables and QSlide
software. The E411 has a serial interface allowing connection to a PC for control and data viewing via
a USB to SPI adapter card and QSlide PC software
This unique IC allows designers to create speed or volume controls using a slider, menu bars, and
other more exotic forms of human interface on the panel of an appliance or personal electronic device.
Generally it can be used to replace any form of linear control, through a completely sealed panel.
Refer also to the QT411-ISSG datasheet.
1.2 Contents of Kit
1 x E411 evaluation assembly
1 x E411 evaluation board (complete with components and self-adhesive on one side)
1 x USB-PC cable
1 x USB-SPI adapter card
1 x 14-way flat flexible cable (FFC)
2 x Sample QT411-ISSG ICs
1 x CD-ROM containing QSlide and User Manual
1 x ‘Getting Started’ Guide
6 x Rubber feet
USB-SPI
adapter card
FFC cable
E411 evaluation
assembly
Figure 1: Evaluation Assembly and USB-SPI Adapter Card
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E411 User Manual
2 Mounting the Spare E411 Board
A spare E411 board is included to allow testing on different applications. It can be adhered to plastic,
glass, or any other dielectric panel. Follow these steps to attach the E411 board and refer to Figure 2:
1. Use ESD precautions when working with the E411 board.
2. Remove the paper backing from the E411 board and adhere the board to the rear of the dielectric
panel. Bend the PCB slightly
Note: The board does allow some flexing, but care must be taken not to bend it too far as this can
crack the SMT components.
3. If planning to use the board on a level surface then attach the rubber feet to elevate the board.
, while smoothing it to remove any air bubbles.
remove the backing paper bend the board slightly
Figure 2: Mounting the Spare E411 Board
attach the rubber feet (if applicable)
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E411 User Manual
3 Setting Up the E411
To prepare the E411 for use, proceed as follows:
1. Using the flat flexible cable (FFC) provided, connect the E411 assembly to the USB-SPI adapter
card, ensuring correct orientation of the FFC. With the E411 connector lock open (Figure 3),
carefully insert the end of the cable into the connector. Once fully inserted, push the connector
lock tabs to close them. Check that they are fully engaged. Repeat for the USB-SPI adapter card.
2. Using the USB cable provided, connect the USB-SPI card to the PC. LED 1 is constantly lit to
indicate that there is power to the card.
3. Install the software; either method is acceptable:
a. Put the supplied CD in the CD drive of the PC. Copy the contents of the CD to your PC.
Double-click the QSlide software to open it.
OR
connector lock
en
o
connector lock
o
en
b. Go to www.qprox.com
, point to the Support tab and click Download Archive. Click Software
and then the QSlide link. A dialog box appears asking if you want to run or save the file that
you are about to download. Click Run. This automatically downloads the software.
If a dialog box appears saying “The publisher could not be verified. Are you sure you want to
run this software?” click Run.
4. QSlide software is displayed on the PC screen. LED 1 now flickers continuously to indicate that
QSlide is communicating with the E411 assembly. Refer to Section 4.2, Page 6 about using the
E411.
connector lock
engaged
E411 assembly – connector lock open E411 assembly – connector lock engaged
connector lock
engaged
USB card – connector lock open USB card – connector lock engaged
LED 1
USB cable to PC
USB card
Connections between USB card and PC
Figure 3: E411 and USB Connectors
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E411 User Manual
4 QSlide
4.1 Introduction
QSlide software is used for the E411 evaluation assembly. With QSlide you can send commands and
monitor signals in real time (see Sections 4.2 and Section 4.3).
Threshold
see Page 7
Drift Compensation Rate
(see Page 7)
Detection indicator
(see Page 7)
Signal Error indicato
see Page 7
Calibrate
(see Page 7)
Output Ratio
(see Page 7)
Connected/Disconnected indicato
Shows when the E411 is
connected to the PC
(see Page 7)
Command Return
(see Page 7)
Slider indicator
(see Page 7)
Status Ba
(see Page 7)
Figure 4: QSlide Information Areas
4.2 How to Use the E411 Assembly
1. Place the E411 assembly on a level surface.
2. Keeping clear of the E411, click Calibrate. Do this every time the E411 is moved, to calibrate it.
3. Touch the slider area of the E411 assembly with your finger. Either slide your finger across the
surface or touch the slider at any point. As you do so the Detection indicator lights, Output Ratio
shows the numerical slider position and Command Return gives the hexadecimal equivalent.
When you remove your finger, the last position touched will be locked on the display. LED 2 on the
USB card lights every time the E411 assembly is touched, for the duration of the touch.
4. If the QSlide software is not detecting, or detection is sporadic, decrease the Threshold slightly.
5. Refer to Section 4.3, Page 7 for details of which parameters you can change.
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E411 User Manual
4.3 QSlide Parameters
Refer to Figure 4, Page 6 to see the parameter areas of the QSlide software.
(refer to the QT411-ISSG datasheet for more information)
Connected/Disconnected indicator is lit all the time that the E411 is connected to the PC but goes
out when the E411 is disconnected from the PC.
Threshold sets the amount of signal change which will cause the E411 to register touch detection.
The default = 25. Click the Threshold arrow and select a new threshold, if required.
Drift Compensation Rate sets the adaptive drift compensation rate. The numbers represent seconds
per reference level. The default = 5. Click the Drift Compensation Rate arrow and select a new rate,
if required.
Detection indicator lights when a touch is detected on the E411 assembly and goes out when the
touch is removed.
Slider indicator moves as you move your finger along the E411 slider. When the touch is removed the
slider indicator shows the last reported touch position. The indicator does not move when only
proximity is detected.
Note: if Threshold is set to a very low level, the indicator may move if the user’s hand is in close
proximity.
Signal Error indicates that the signal has the wrong polarity, usually due to E411 assembly
movement. Clicking Calibrate will resolve the error.
Calibrate - calibration should be performed with the E411 assembly in the position in which it will be
used, with hands at a distance, to get a valid reference level. Once positioned, click Calibrate to
calibrate the E411 assembly.
Note: the E411 assembly may need to be recalibrated if it is moved.
Output Ratio shows the numerical slider position, with touch, from 0 to 127. This changes in real time
as the position of touch on the E411 slider changes.
Command Return represents the QT411’s response status byte in hexadecimal. This is useful for
diagnostic purposes. It changes in real time as the position of touch on the E411 slider changes.
The Status Bar indicates if the USB is connected and also which version of QSlide software is
present.
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E411 User Manual
5 E411 Assembly Details
5.1 Circuit Diagram
Figure 5: E411 Circuit Diagram
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E411 User Manual
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5.2 E411 Assembly Components
J1 (SPI interface)
U1 (QT411 IC)
LED 1
U2 Voltage Regulato
Figure 6: E411 and USB-SPI Adapter Card Assembly Details
LED 2
Slider Element
J1, SPI Interface Connector
This connector provides all signals and power needed to communicate with the USB adapter or an
external host, such as a microcontroller.
If you wish to connect the E411 to a microcontroller and operate the QT411 in Sleep mode you will
need to provide in your interface circuit a 1nF capacitor between DETECT (J1 pin 10) and GND. Refer
to the QT411 datasheet for more information.
Table 1: J1, SPI Interface Connector
Pin Name Pin Name
1 N/C 8 SDI
2 N/C 9 DRDY
3 N/C 10 DETECT
4 N/C 11 N/C
5 SDO 12 N/C
6 /SS 13 VSS
7 SCLK 14 VIN
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E411 User Manual
U1, QT411 IC
Table 2: U1 (QT411 IC)
Pin Name Pin Name
1 VDD 8 SNS2A
2 SDO - serial data (output) 9 SNS1B
3 /SS - slave select (input) 10 SNS1A
4 SCLK - serial clock (input) 11 SDI - serial data (input)
5 SNS3B 12 DETECT - active high (output)
6 SNS3A 13 DRDY - data ready (output)
7 SNS2B 14 VSS
U2, Voltage Regulator
The E411 uses a Low Dropout (LDO) regulator to regulate the 5V coming from the USB adapter card
down to 3.3V. Resistor R5 is used to provide a minimum load on the regulator when the QT411 goes
to sleep between acquisitions; this is necessary for regulator transient stability.
Since the QT411 works on a lower voltage (3.3V) than the USB card (5.0V), the signals from the USB
card to the E411 must be level-shifted down. This is done using resistive dividers R1, R2 and R3, plus
a set of resistors placed in series with the signal lines on the USB card.
Slider Element
The slider consists of resistors R11...R28 and the copper pads to which they connect.
Sampling Capacitors
C3, C4 and C5 are the Cs sampling capacitors. Increasing their value will increase sensitivity and
resolution of measurement, but will also tend to make the response time slower.
LED 1 (on USB card) – before the QSlide software is running, LED 1 will be on constantly, to indicate
that the USB card is connected to the PC and has power (see Figure 6). Once the QSlide software is
running, LED 1 flickers continuously to indicate that the software is communicating with the E411
assembly.
LED 2 (on USB card) – stays on when the E411 assembly is touched, for the duration of the touch
(see Figure 6).
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6 Troubleshooting
Problem Potential Cause and Solution
E411 User Manual
Software will not communicate
with PC
Noisy or erratic signal !!!! Noisy power supply
!!!! Bad SPI or USB connection
Check that the USB cables are connected properly.
Check/replace cables
Ensure that the E411 assembly is getting power and the USB card LED 1 is on
Try a different USB port or PC
!!!! Cables or E411 assembly too close to strong noise source
(such as a power line or switching noise source)
Increase the distance between the E411 assembly and the noise source
Place a grounded metal shield between the noise source and the E411 assembly
!!!! E411 assembly is not mechanically stable
Prevent E411 assembly from moving around
!!!! Strong RFI from a transmitter or adjacent digital product
Remove the noise source or shield against it
!!!! USB cable connected via a USB hub
Connect the USB cable directly to the PC
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L Q
www.qprox.com
Corporate Headquarters
1 Mitchell Point
Ensign Way, Hamble
Southampton SO31 4RF
United Kingdom
Tel +44 (0)23 8056 5600
Fax +44 (0)23 8045 3939
Copyright © 2006 QRG Ltd
All rights reserved
Patented and patents pending
Development Team
Martin Simmons, Keith Britton, Matthew Trend
North America
651 Holiday Drive Bldg. 5 / 300
Pittsburgh, PA 15220
USA
Tel 412-391-7367
Fax 412-291-1015
REV 100.0506
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