Figure application weather monitor irrigation control Funnel

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Bourns® Linear Motion Potentiometers: 3046 3048 Digital Circuit Application Note
Figure application weather monitor irrigation control
Funnel
Bourns® 3046
Float
funnel system used collect rainfall from rain gutter. This adaptation shall define rainfall linear displacement floating device inside funnel. 3046 linear motion potentiometer will connected voltage divider, shown Figure will operate position sensor such that mechanical displacement floating device inside funnel shall converted proportional voltage output.
VOUT
XELECTRICAL TRAVEL
Mechanical Range (inches)
Figure Functionality 3046 Linear Motion Potentiometer
voltage output signal connected comparator serves digital conversion from analog data, shown Figure comparator, following conditions will apply: VREQ FULL Logic Else, FULL Logic That when funnel FULL, maximum electrical travel will reached. Once corresponding output voltage obtained, comparator will send Logic signal interface. Otherwise, will send Logic FULL VFULL
Figure 3046 position sensor connection comparator
32-bit Microcomputer-based System basic system shown Figure timer switches sprinklers on/off predetermined times. will modified that controller shall determine current status sprinkler system. 3046 will used detect measurement collected rainfall based voltage output signal. levels rainfall will determine sprinkler shall continue with normal operation reset next day.
Output Voltage Ratio
VMAX
Timer switches sprinklers on/o predetermined times
VREQ Controller determines status sprinkler system
NIGHT
NOON
Figure basic system
microcontroller will programmed meet following elemental conditions: Wait "On" signal Wait "Off signal "Rain" flag needed Read flag; needed
External Interrupts this example, microcontroller 68020/68230-based microcontroller. 32-bit microprocessor seven levels external interrupts pins IPL0', IPL1', IPL2', which will used elemental conditions. will operate that value IPL0, IPL1, IPL2 greater than current interrupt mask, 68020 acknowledges initiates request. Otherwise, continues with current interrupt. status sprinkler system will either FULL (funnel full), (sprinklers turned on), (sprinklers turned off). Based inputs FULL, END, system will following modes: Normal Mode FULL Mode Mode Mode (Highest Priority) reason, sprinklers need turned off, Mode highest priority. FULL mode lower priority than that rains more than once during day, system will continue that signal. will already programmed turn next day.
FULL VFULL
System Block Diagram VFULL VREQ run_INTR full_INTR 68020/68230 IPL2 IPL1 IPL0
Fill
end_INTR
(Run) (End) OUT0 (Fill) OUT1 (Run) OUT2 (End)
Logic Gates Muliplexers 68000
Figure general block diagram showing alterations basic system implement application
Derive Logic Table shows logic gates their connection configuration. white boxes show mode interrupts with each corresponding priority. green boxes show state lines when white boxes true. blue boxes show necessary input interrupt pins. INTR Full Start Normal Priority full_INTR run_INTR end_INTR !IPL2 !IPL1 !IPL0
Table Derivation logic priority levels interrupts
purpose priority levels eliminate FULL MODE every time rains. Software Algorithm Based previous conditions discussed earlier, 68020/68230 microcomputer will perform following: Using position sensor funnel, VREQ funnel FULL (HIGH); Otherwise, funnel FULL (LOW). Input FULL Port Drive Port
Using timer with switch connected sprinkler system, sprinkler switch input HIGH; Otherwise, sprinkler. Input switch bits Port Drive outputs bits Port auto vector level maskable interrupts used with four priority levels follows: Priority Level Normal Interrupt: Bits Port LOW. Priority Level Full Interrupt: Port HIGH. Priority Level Start Interrupt: Port HIGH. Priority Level Interrupt: Port HIGH. software written using 68000 assembly language. order autolevel vector interrupts, should noted that AVEC 68020 needed enable them. Further note, alternative design would EPROM determine current level priority. this system, 74HC148 8-to-3 Encoder utilized interrupt. Also, rather than using actual timer, alternative software timer, such counter. Validate Total System Operation There benefits using linear motion potentiometer digital system. have shown modify existing system, such home sprinkler. This application feasible expansion prototypical scheme. also integrated with larger systems, such weather irrigation neighborhood. Ultimately, provides potential expand with multiple wider systems adapt many other applications. There endless possibilities that integrate Bourns LMPs part embedded circuit design. spin-off trimming potentiometer product line, linear motion potentiometer developed meet needs designers wishing detect linear movement position. Other applications these compact components include, limited Solenoid positioning sensors automated controllers Volume control audio equipment Joystick controllers Satellite dish positioning Robotics information Bourns® Design Kit, please contact your local Bourns sales office authorized Bourns distributor.
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Figure application weather monitor irrigation control Funnel

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