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ISU Inclinometer Board

ISU Inclinometer Board

The ISU series of Single-Axis Digital Inclinometers are self-contained, ready-to-use circuit modules which provide real-time digital measurements of angular displacement through a full 360 degree range. The ruggedized, non-contact capacitive sensor is combined with precision measurement circuitry to provide a cost-effective combination of accuracy, range, and operating temperature in an easy to use footprint. The units can be used in a wide variety of applications, accept a standard 5 Volt DC supply, and provide both RS-232 and Pulse Width Modulated (PWM) outputs.

Programmable options include power auto-shutoff and 4-bit addressability allowing up to six ISUs to be 'party-lined' together for applications requiring multiple sensors.

Specifications

Parameter (1) ISU-S
Standard Accuracy 		ISU-H
High Accuracy

Range:

360°

Accuracy:

0° ±10°

±0.1°

±0.05°
 

90° ±10°

±0.1°

±0.05°
 

Other angles

±0.2°

±0.02°

Resolution:

RS-232 output

0.00549° binary, 0.01° ASCII
 

PWM output

0.09°

Temperature coefficient:

At 0° or 90° ±1°

0.006°/K
 

Other angles

0.012°/K

Repeatability:

±0.1°

±0.05°

Hysteresis (2):

0.10°

0.10°

Noise:

±0.2°

±0.01°

Time constant:

0.4 s typical

Frequency response (-3 dB):

0.4 Hz typical

Angle output rate:

every 8/15 second (533 ms)

Power input:

Voltage

5.0 VDC
 

Operating current

2 mA
 

Sleeping current

10 µA

Serial port:

Protokol

RS-232 (except for voltage levels)
 

Voltage

5 V
 

Baud rate

9600 Baud
 

Output impedance

10 kOhm

PWM output:

Voltage

5 V
 

Frequency

30 Hz free running
 

Pulse width

varies 49.5 µs per degree of angular displacement

Weight:

approx. 23 g

Temperature range:

Operating

-30 ... +55 °C
 

Storage

-55 ... +65 °C

Humidity sensitivity:

conformal coated

1) Specifications subject to change without notice. Specifications are at 77°F (25°C) unless otherwise stated.

2) Average over 360 degrees

Dimensions and Wiring

Dimensions of ISU Inclinometer Boards

All dimensions in "inches", values in brackets in ""mm", approx. values.
These drawings are for information only and not intended for construction purpose. Please ask for detailed drawings.

Notes:

  • BKGD (Background) pin is for internal programming only. Customer use of this pin may damage the ISU.
  • Customer may utilize either the existing PWM output directly driven by the MCU, or new optional PWMLoad, which is the same source but with SMBT3906 transistor driven output.
  • Legacy half moon shaped indents remain for customer's existing mounting technique.
  • Three new mounting through holes offered as optional mounting method.
Wiring: Pin Existing HC05 New 9S08

Top Row

1 (closest to sensor)

5 V ground

5 V ground
 

2

+5 V

+5 V
 

3

--

--
 

4

PWM

PWM
 

5

not available

PWMLoad*

Bottom Row

1 (closest to sensor)

RESET

RESET
 

2

0 Trigger

0 Trigger
 

3

TxEN

TxEN
 

4

Rx

Rx
 

5

Tx

Tx
 

6

not available

Not for customer use

* Same as PWM except the PWM signal is fed through a SMBT3906 PNP transistor. Not for use if using PWM. Customer can only use one at a time, either PWM or PWM Load

Ordering Information

Model Order Part Number Description

ISU-S

90104001

Standard accuracy version

ISU-H

90104020

High accuracy version
Information in the PDF datasheet (see above) may be more detailed. Due to continual product development, ALTHEN and partners reserve the right to vary the foregoing details without prior notice.