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' ' set the mode to 2400 baud, IrDA ' this writes to the configuration register writemode: low cs shiftout din,sclk,msbfirst,[$C08D<\\>16] high cs
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' ' transmits the message in data space "fox" ' "the quick brown fox... +CRLF sendfox: char.byte1=$80 ' make rts high, red led on ' rts is bit 1, pin is made high when bit is low. ix=0 sendfox1: ' this loop gets fox, null terminated string. read ix,char.byte0 if char.byte0=0 then sendfoxend sendfox2: low cs pulsout sclk,2 ' get one bit tst=dout ' test that transmit buffer is empty
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high cs if tst=1 then sendfox2 ' loop back until ready low cs ' now send the character shiftout din,sclk,msbfirst,[char<\\>16] high cs ix=ix+1 goto sendfox1 ' look for next char to send sendfoxend: low cs ' now turn off RTS pin ' the TE<\\> bit=1, so no data is transmitted. shiftout din,sclk,msbfirst,[$8600<\\>16] high cs goto terminal ' back to receiving characters ' and testing cts
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' ' now enter a loop to receive data and print it on a debug screen ' jumps to sendfox routine when the hardware cts line is low ' by pressing the pushbutton in the above circuit terminal: low din ' sequence to receive data, both 8-bit status and 8-bit data low cs shiftin dout,sclk,msbpre,[char<\\>16] ' 16 bits total high cs if cts then sendfox ' Jump to sendfox is pushbutton down. ' cts bit is high when the pin is low if Rbit=0 then terminal ' skip printing if there is no character ' Rbit is the flag for this. debug char.byte0 ' print the character goto terminal ' receive more bytes
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IrDA communicator program (Continued).
80 IRDA COMMUNICATOR
IrDA Communicator (High-Power Version) Parts List
U1 U2 U3 U4 U5 R1 R2 R3 R4 R5 C1 C2, C3 C4 C5 D1 D2 Q1 S2, S3 S1 Miscellaneous BASIC STAMP 2 (original) MAX3100 UART IC, Maxim CD4069 inverter IC, National OPT101 IR receiver IC, Burr-Brown LM7805 5-V regulator, National 10-k 2-k 49330100-k
1 1 1 4-W
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0.1- F 35-V tantalum capacitor 20 pF 35-V disk capacitor 4.7- F 35-V electrolytic capacitor 0.22- F 35-V disk capacitor Red LED High-power IR LED (RS-276-1443) p-channel MOSFET IRF9530 Normally open momentary pushbutton SPST toggle power switch PC board, 4-pin male header, 4-pin female header, DB-9 connector wire, enclosure, etc.
MULTICHANNEL RADIO ALARM SYSTEM
CONTENTS AT A GLANCE Basic Components Construction Multichannel Alarm Transmitter Parts List Multichannel Alarm Receiver/Display Parts List
he multichannel radio alarm system is an extremely useful portable alarm system that has many applications around your home, office, or shop areas. The multichannel alarm system is a two-unit system, consisting of (1) a 12-channel alarm controller utilizing the BASIC STAMP 2 processor and an Abacom RT5 mini data transmitter that sends alarm activations and (2) a remote receiver/display unit. The remote receiver/display section of the system consists of an Abacom HRR-3 receiver, an LCD display, and a piezoelectric alarm buzzer. The piezo buzzer alerts you to an alarm condition; you can then look at the display and see which alarm channel has been activated.
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82 MULTICHANNEL RADIO ALARM SYSTEM
The 12-channel radio alarm system will enable you to monitor many different types of sensors or alarm conditions in a single room or numerous sensors/switches in surrounding rooms, and it will send an alarm condition via radio to the receiver/display unit in a remote location up to 150 ft away, such as an adjoining room or building. Substituting an Abacom AM-RRS2 receiver will allow a 300-ft range.
Basic Components
Our discussion of the multichannel radio alarm begins with the alarm input conditioner circuit shown in Fig. 6-1. The input conditioner circuit is designed to accept both normally open and normally closed inputs. Switches S1, S2, and S3 can be normally open sensors or door switches. You can add any number of additional switches if desired. Normally closed or supervised switches or sensors are shown at S4, S5, S6, and S7. Additional switches or sensors can also be connected in series with these switches if desired. The input conditioner is powered from a 5-Vdc source. The diodes D1 and D2 apply a trigger signal to activate transistor Q1, which in turn is used to supply 5 V on activation of any alarm to the input of the STAMP 2. This circuit represents an alarm zone. If desired, an input conditioner can be placed ahead of any of the STAMP 2 input channels. In operation the output of the input conditioner is connected directly to an input channel of the multichannel alarm input instead of through the switch, as shown on the system diagram in Fig. 6-2. The heart of the 12-channel radio alarm is centered around the BASIC STAMP 2 microprocessor shown at U1 in Fig. 6-2. The 12 input channels are featured from P0 through P12. Each input is tied to ground through a 10-k resistor. Each of the inputs is shown connected to normally open switches, but the switch could be any type of normally open switch or sensor, such as magnetic door or window switches or floor mat sensors. Note that the switches or sensors are tied to 5 V The STAMP 2 controller is powered on pin 21 . through toggle switch S1, from a 5-Vdc source from the U2. A system reset push button is connected to the reset pin 22, to allow resetting the processor in the event of a system lockup. A PC board normally open mini pushbutton was used for the reset button. A system status lamp D2 is driven by STAMP 2 pin P13. This indicator is used to show the system start-up and status conditions. A siren or local alarm output is provided at P14, which can be used to drive a flasher light, siren, or Sonalert via relay RY1. Note that a larger-current device can be accommodated if RY1 is used to drive a larger-current relay, which in turn drives a high-current output device. The STAMP 2 controller is programmed via the DB9 connector. Pins 1 through 4 of the STAMP 2 are brought out to a 4-pin male header at P1 that mates to a female header at J1. A programming cable is then wired between J1 and the a DB-9 female connector. The STAMP 2 is coupled to an Abacom AM-RT5 data transmitter at TX (see Fig. 6-3). The RT5 is a complete hybrid RF transmitter with a 70-m range. The transmitter can transmit data at up to 4 kHz from any standard CMOS or TTL source. Power consumption of the minitransmitter is about 4 mA. This low-cost 4-pin data transmitter measures only 10.1 by 17.7 mm. The RT5 is powered from a 5 Vdc source at pin 1. A ground connection is
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