SingleTact SingleTact Standard Manuale utente

USER MANUAL

EXPERIENCE

INCREDIBLE

PERFORMANCE

V2.3

pg. 2

CONTENTS

1INTRODUCTION............................................................................................................................................... 3

2INTERFACE DESIGN ......................................................................................................................................... 4

2.1 Connectivity.............................................................................................................................................. 5

2.2 Analog Interface....................................................................................................................................... 6

2.3 I2C Interface.............................................................................................................................................. 7

2.4 I2C Operations ........................................................................................................................................ 10

2.4.1 I2C Write Operation ........................................................................................................................ 10

2.4.2 I2C Read Request Operation ........................................................................................................... 11

2.4.3 I2C Read Operation.......................................................................................................................... 11

2.5 Conversion Detail ................................................................................................................................... 13

2.6 Product Categories................................................................................................................................. 14

3TROUBLESHOOTING SingleTact .................................................................................................................... 15

3.1 Arduino UNO not detected by PC. ......................................................................................................... 16

3.2 Invalid setting error on PC (Popup reports” Failed to set”)................................................................... 16

3.3 No Analog output (remains at 0V). ........................................................................................................ 16

3.4 Analog output stays at 0.5V. .................................................................................................................. 16

4EXAMPLE USE CASE....................................................................................................................................... 17

4.1 PC and Arduino Example........................................................................................................................ 18

4.2 Programming the Arduino UNO with SingleTact Example..................................................................... 20

4.3 Arduino Demo Outline ........................................................................................................................... 22

4.4 Example .NET API ................................................................................................................................... 26

5Resources...................................................................................................................................................... 27

6Glossary......................................................................................................................................................... 28

7Revision History ............................................................................................................................................ 29

pg. 3

1INTRODUCTION

SingleTact is a single element tactile pressure sensor that accurately and reliably quantifies applied

force combined with a simple interface board offering a 0 to 2V analog output for immediate Data

Acquisition (DAQ) integration and an I2C based interface for integration into embedded systems.

Standard and Calibrated sensors (with matched pre-calibrated interface board) are available.

This document provides all the information necessary to interface with the SingleTact including a

sample Arduino digital interface and simple C# PC DAQ software (see EXAMPLE USE CASE)

All demo and API source code is open source and can be downloaded from: www.singletact.com.

Figure 1 SingleTact Sensor and Interface Board

Figure 2 Use Case Configurations

*1 –In addition to the data acquisition example, a .NET library is available to download for simple integration into a user’s

own software suite. See Example .NET API.

*2 –Supports over 100 SingleTact interface boards on a single I2C bus. The interface board firmware can be modified to

fit user’s specific use cases – if required please contact PPS to discuss this option.

*3 –PPS maybe able to assist with this –use the contact links at http://www.singletact.com/contact/.

SingleTact.com

MCU

Single Tact.com

MCU

Arduino and PC data acquisition

evaluation software

Analogue Out. Connect to multitier,

oscilloscope or data acquisition card

User reads capacitance

using their own circuitry

Single Tact.com

MCU

UNO

Single Tact.com

I2C Digital Output. Interface to user

electronics

Single Tact.com

MCU

User

Hardware

Analog

Measurement

I2C

User

Hardware

pg. 4

2INTERFACE DESIGN

pg. 5

2.1 Connectivity

The sensor is plugged into the FFC connector on the green interface board (with the sensor

connector pads facing upward). The connections are outlined in Figure 4.

Electrical parameters are outlined in Table 1.

Figure 3 Sensor Assembly

Figure 4 Interface board header connections

Table 1 Electrical parameters

Parameter

Value

Supply Voltage, Vcc

3.7 –12V

I2C clock frequency

100KHz or 400KHz

I2C bus level

3 –5V

I2C output range (sensor data)

10-bit (Operational FSR output 9-bit)

Analog output range

0 –2V (Operational FSR output 0.5 –1.5V)

Permitted analog output load

>5K

Frame Sync level

3.3V CMOS output

Sensor update rate (I2C or analog)

>140Hz (dependent on settings)

SingleTact.com

MCU

Note via orientation

CONNECTION

Reserved

I2C Interface (SDA)

Frame Sync

Ground

CONNECTION

Reserved

I2C Interface (SCL)

Analog Out

Vcc

NUMBER

pg. 6

2.2 Analog Interface

The analog output swings from 0to 2V, with the valid working output ranging from 0.5V to 1.5V as

shown in Figure 5.

As pressure increases beyond the full scale range (FSR) the output will increase to 2V and then limit.

The sensor should be unloaded at power on to allow the sensor’s baseline to be registered correctly.

NOTE: An output below 0.5V may indicate negative pressures, which occur when the sensing area is

under tension. This should be avoided since it can damage the internal structure of the sensor.

NOTE: Sensor over pressure should be limited to less than 3x FSR to avoid damaging the sensor.

Figure 5 Analog Output

OVER

PRESSURE

NEGATIVE

PRESSURE

VALID

RANGE

Force or Pressure

Analog Output

0.5V

1.5V

2.0V

FSR

pg. 7

Figure 6 DAQ Connection Requirements

2.3 I2C Interface

The SingleTact I2C interface supports the standard (100 Kbits/s) clock rate in 7-bit address mode.

The SCL and SDA lines must be pulled up to the bus voltage which can be between 3V and 5V.

Please refer to the I2C specification for bus protocol implementation & pull-up value considerations.

The interface board will always respond to two I2C addresses: 0x04 and the address specified in

flash (register address 0). As shipped the default flash address is also 0x04.

Multiple sensor interfaces may be connected to a single I2C bus. The bus address of individual

sensor interfaces can be configured by writing desired address value (4 to 127) via the I2C interface

to register address 0 with an I2C Write Operation. Change of individual sensor I2C addresses is

supported by the PC and Arduino Example.

NOTE: As the interface board will always respond to address 0x04 then this address must be

considered reserved for SingleTact. Where multiple SingleTact interfaces are to be connected to the

same I2C bus then address 0x04 must be considered invalid and in this use case the configurable

address of all connected SingleTact nodes must be individually changed from the default value before

each SingleTact is added to the multi-node bus.

The SingleTact software architecture is based on a 192 byte register block –see Figure 7 and

Table 2 for details.

All control registers are located in first 112 bytes and get written to NVM when modified (and are

therefore persistent after a power cycle). Configuration registers on Calibrated sensors interfaces are

protected from modification.

The sensor results are available from bytes 128 to 133. As shipped, results are updated at >140Hz

(this is dependent on capacitance sensor settings).

CONNECTION

No Connect

Ground

CONNECTION

No Connect

Analog Out

Vcc

NUMBER

pg. 8

NOTE: It is the Users responsibility not to write to any Reserved locations.

Figure 7 Register Layout

Table 2 Register Details

BYTE

SETTING

I2C Address (4-127)

User configurable serial number MSB

User configurable serial number LSB

Reserved

Capacitive Sense (Accumulator) Default 0x04 *1

Capacitive Sense (Reference Gain) Default 0x01 *1

Reserved

Capacitive Sense (Discharge Time) Default 0x03 *1

Control

and

Status

111

Output

Sensor Data

128

191

Writes get stored

to Flash

Read Only

pg. 9

BYTE

SETTING

Capacitive Sense (Output Current) Default 0x00 *1

Output digital scaling MSB

Output digital scaling LSB

Number of elements, must be 1

Reserved

Delimiter –leave as 0xFF

First element to scan, set to 0

16-39

Reserved

Delimiter –leave as 0xFF

Sensor baseline MSB

Sensor baseline LSB

43-90

Reserved

Delimiter –leave as 0xFF

92-127

Reserved

128

Frame index MSB (increments on each new reading)

129

Frame index LSB (increments on each new reading)

130

Sensor Timestamp MSB (0.1ms increments) *1

131

Sensor Timestamp LSB (0.1ms increments) *1

132

Sensor output MSB

pg. 10

BYTE

SETTING

133

Sensor output LSB

134 - > 191

Reserved

*1 Should only be used as a coarse estimate as it is subject to drift.

2.4 I2C Operations

I2C SingleTact supports three I2C operations: Write, Read Request and Read.

2.4.1 I2C Write Operation

I2C bus Transfer: Master Write to Slave.

This command writes values to the register block. All writes also update the internal flash memory so

settings are persistent through a power cycle.

Bytes 3 to N-1 (where N is the packet length) contain the data to be written to consecutive registers.

Data may be written to the first 128 bytes (excluding reserved locations).

Writing outside of the valid range will fail.

Configuration registers on Calibrated sensors interfaces are protected from modification.

Table 3 Write Operation Data Packet Format

BYTE

TO SENSOR

0x02

Write offset in register block

Number of bytes to write (1 –28)

3 -> (N-1)

Data to write (1 to 28 bytes)

N (max 31)

0xFF –end of packet delimiter

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