750-00004 Parallax Inc, 750-00004 Datasheet - Page 25

• Manufacturer Part Number: 750-00004
• Description: POWER SUPPLY 24VDC 600MA
• Manufacturer: Parallax Inc

Specifications of 750-00004

• Form: Wall Mount (2 Prong)
• Voltage - Output Per Connector: 24VDC
• Current - Output: 600mA
• Polarization: Positive Center
• Cord Plug: 2.1mm I.D. x 5.5mm O.D. x 12mm Female
• Voltage - Input: 120VAC
• Power - Output: 14W
• Transformer Type: Linear, Unregulated
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Efficiency: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

The subroutine "Control_Pumps" decides which pump to start based on how much run-time is on each
pump. The idea here is to even the wear.
Control_Pumps:
GetDigitalInputs:
Read_Tank_Level:
'
The other two subroutines on this section of code are straight forward, but for the trick we play with the
"tankLevel" variable. The A/D converter is a 12-bit device. Our example program is only concerned with
the upper 8 bits of data, so we shift the data four positions to the right. This is a fast way to divide by 16
within a binary digital system. If you wanted more precision for you’re application simply forego this step,
but beware that you need to ensure the memory you use must accommodate the extra bits.
Parallax, Inc. • Stamp PLC (#30064) • Version 1.8 • 12/29/2003
SELECT tankLevel
ENDSELECT
RETURN
LOW load
PAUSE 1
HIGH load
PAUSE 1
SHIFTIN SrDin,SrClk, LSBPRE, [tmp]
RETURN
LOW AdcCs
PAUSE 1
SHIFTOUT AdcDout, AdcClk, MSBFIRST, [240]
HIGH AdcCs
PAUSE 1
LOW AdcCs
PAUSE 1
SHIFTIN AdcDin, AdcClk, MSBPRE, [tankLevel\12]
PAUSE 1
HIGH AdcCs
tankLevel = tankLevel>>4
RETURN
DEBUG "Tank Level:", DEC3 tankLevel, " inches
CASE < setPoint2
CASE < setPoint1
CASE ELSE
startCode = 3
GOSUB StartA
GOSUB StartB
IF (pumpAStatus <> 1 AND pumpBStatus <>1) THEN
ENDIF
GOSUB Stop_Pumps
IF RunTimeA < RunTimeB THEN
ELSE
ENDIF
startCode = 1
GOSUB StartA
startCode = 2
GOSUB StartB
'Tank Level
'Reads tank level
'Divide it by 8
"
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