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Oftentimes it is necessary for the engineer to control a small fractional horsepower electrical motor as a part of his experimental apparatus. The easiest way to do this is to use a solid-state relay that will accept a TTL signal as its input and have the capacity to control the current and voltage needed by the motor. A number of vendors provide very easy-to-use, solid-state relays that meet these specifications, via the Internet. Figure 29-1 shows the relay manufactured by Crydom and available from Jameco.
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Figure 29-1 A solid-state relay (note the indicator LED)
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Check to see that the relay will handle an AC load at least twice the current you want to control. Electric motors should not be turned on and off more than a couple of times a minute and can usually not use a PWM signal. The control of inductive loads is similar to the control of electric motors. Provide a diode across the inductance to absorb the back EMF when the electric field in the inductance collapses. Size the diode so that it can amply handle the back current and voltage created by the inductance shutoff. Over-sizing the diode by a factor of three or four is recommended. If you need to control a larger motor, you can do so by controlling the starter for the relay with a solid-state relay. Using a relay as an intermediate device expands the possibilities tremendously, but does not allow the modulation of signals. In the usual state, larger loads need to be started no more than a few times in a minute. See the guidelines provided in the National Electrical Code for more information. If you have to control a reversing load, it may be necessary to use two solid-state relays one for each direction and to provide software interlocks and delays to ensure proper and safe operations. Safety becomes a major consideration when controlling large loads. Get the help of an expert when managing loads you are not familiar with. The requirements of the National Electrical Code have to be met when using more than 24 volts. An electrician can help you meet the requirements. Local codes will also need to be followed, and your company may have requirements that have to be met as well.
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Part IV
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Appendixes
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LCdroutines4 And UtiLities ObjeCt Listings
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The listings for the LCDRoutines4 and Utilities objects are provided in this appendix in case this information ceases to be available on the Internet for any reason in the future. The LCDRoutines4 and Utilities objects are called from almost all the methods in this book, so they are essential for running almost all the programs in this book. These listings can be downloaded from the Encodergeek.com website for the foreseeable future. You can cut and paste the files from there. Because indentation is an important part of a program listing in Spin, the source you use must preserve the indentation.
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{{21 Sep 09 Harprit Sandhu LCDRoutines4.spin Propeller Tool Version 1.2.6 Appendix Program 01 LCD ROUTINES for a 4 bit data path. The following are the names of the methods described in this program INITIALIZE_LCD PRINT (the_line) POSITION (LINE_NUMBER, HOR_POSITION) | CHAR_LOCATION SEND_CHAR (DISPLAY_CHAR) SEND_CHAR (DISPLAY_CHAR) PRINT_DEC (VALUE) | TEST_VALUE PRINT_HEX (VALUE, DIGITS) PRINT_BIN (VALUE, DIGITS) CLEAR HOME SPACE (QTY)
LCdroutines4 And UtiLities ObjeCt Listings
Revisions 04 Oct 09 }} CON
Initialize made more robust, misc unnecessary calls removed.
_CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 DataBit4 = 12 DataBit5 = 13 DataBit6 = 14 DataBit7 = 15 RegSelect = 16 ReadWrite = 17 Enable = 18 high =1 low =0 Inv_high =0 Inv_low =1 VAR byte byte temp index
'all the constants used by all the METHODS 'in this program have to be listed here 'The system clock spec. 2 X multiplier 'ext crystal is 5 MHz, so 10 MHz operation 'are named so that they can be called by 'name if the need ever arises ' ' 'The three control lines 'The three control lines 'The three control lines 'define the High state 'define the Low state 'define the Inverted High state 'define the Inverted Low state 'these are the variables we will use 'for use as a pointer 'to count characters
PUB Go INITIALIZE_LCD repeat print(String("4bit mode line 1")) position(2,1) print(String("4bit mode line 2")) waitcnt(clkfreq/4+cnt) clear waitcnt(clkfreq/4+cnt) {{initialize the LCD to use 4 lines of data Includes the half second delay, clears the display and positions to 1,1 no variables used }} PUB INITIALIZE_LCD 'The addresses and data used here are waitcnt(150_000+cnt) 'specified in the Hitachi data sheet for the DIRA[DataBit4..Enable]~~ 'display. YOU MUST CHECK THIS FOR YOURSELF. SEND_INSTRUCTION (%0011) 'Send 1st waitcnt(49_200+cnt) 'wait SEND_INSTRUCTION (%0011) 'Send 2nd waitcnt(1_200+cnt) 'wait SEND_INSTRUCTION (%0011) 'Send 3rd waitcnt(12_000+cnt) 'wait SEND_INSTRUCTION (%0010) 'set for 4 bit mode waitcnt(12_000+cnt) 'wait
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