NT RE - 108
ROTARY ENCODER

One of hydrology parameter is water level. Water level could describe characteristic of a watershed. The change of water level can be measured by using water level floating type recorder. This tool works by measuring the direction and distance of movement through the rotation of pulley which rotated because of the waterlevel change. Commonly, that tool built with movement sensor and movement (rotary) encoder series. Rotary encoder series can be built by using IC (integrated circuit) 4093. By using hall effect sensor as movement sensor which is give input to rotary encoder series, water level change can be measured. Output signal from rotary encoder series have to process to get distance of water level change. Inverter series and monostable positive - negative edge trigger series with OR gates circuit as lattest output are aplide on that process. On this research, a half rotation on pulley produce a movement signal. Distance of that movement depend on pulley size. By using the 1cm diameter pulley, the resolution is about 1,57cm.

SPECIFICATIONS
A. Microcontroller System
- Architecture AVR@ - Output Data Digital ASCI / Text
- Controller ATMEL 128 RISC Processor
- Power Input System 8 - 24V
- Speed 4 MHz - Display LCD 16 x 2 Character
- Program Memory 4 Kb - ADC 10 bit
- EEPROM 4 Kb - Battery Timer / Real Time Clock
- Interface RS-232 / Ethernet 10 BT
- Built In Smart Regulator Solar System
- Watchdog Timer - ISP
- Logger SD Card 1GB - RTOS
- Operational Temp Range -20°C to 70°C
- Data Sending : Polling, Scheduling and event
- Output Data Digital ASCI / Text
- Power Input System 8 - 24V
- ADC 10 bit
- Built in Output /Input Rotary encoder

B. Rotary Encoder
Power Supply Voltage 5 VDC ±5%, Ripple (p-p): 5% max
Current Consumption 130 mA max.
Resolution 10/20/30/40/50/60/100/200/
(pulses/rotation) 300/360/400/500/600/1,000/
1,024/1,200/1,500/1,800/2,000 P/R
Output Phases A, A, B, B, Z, Z
Output Configuration (NPN output)
Line driver output
Output Capacity AM26LS31 equivalent
Output current:
High level = Io = -20 mA
Output voltage:
High level = Vo = 2.5V min.
Low level = Vs = 0.5 V max
Max. Response Speed 100 kHz
Phase Difference on Output 90°±45° between A and B (1/4T±1/8T)
Rise and Fall Times 0.1 μs max. (Cable length: 2 m; of Output Io: -20 mA; Is: 20 mA)
Starting Torque 0.98 m N m max
Moment of Inertia 1 x 10-6 kg m2 max.; 3 x 10-7 kg
m2 max. at 600 P/R max.
Shaft Loading Radial 30 N, Thrust 20 N
Max. Permissible Speed 6,000 r/min
Protection Circuits Power supply reverse polarity protection, Output load short-
circuit protection
Dielectric Strength 500 VAC, 50/60 Hz for 1 min
between current- carrying parts and case
Vibration Resistance 10 to 500 Hz, 150 m/s2 or 2-mm
double amplitude for 11 min 3
times each in X, Y, and Z directions
Shock Resistance 1,000 m/s2 3 times each
in X, Y, and Z directions
Degree of Protection IEC 60529: IP50
Connection Method Pre-wired Models (std. length: 0.5 m)
Approx 100 g

C. Float and Counter weight
Float: h = 32 cm diameter = 2 in Weight = 800gr
Counter Weight:
h = 10,5cm, diameter = 15mm, weight = 235gr

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