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The second half of our 12-channel radio remote control system revolves around the Abacom AM-HRR3-418 receiver and the alternative STAMP 2 microprocessor. The AM superregenerative receiver module is a low-cost, highly stable hybrid design. The receiver module pinout is shown in Fig. 8-5. The receiver module is placed on 0.1 in. PCB holes and measures 38 by 13.7 mm. The receiver has very low power consumption at 2.5 mA average. A block diagram of the AM-HRR3 receiver is shown in Fig. 8-6. The antenna lead-in feeds the RF preamp input section, which in turn is coupled to the RF oscillator. The RF oscillator is next fed to a low-pass filter section and then out to the AF or audio amplifier portion of the module. Finally, the AF amplifier is connected to a comparator, which presents the data output. Power and ground are applied to multiple pins on the
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AM RT5 418MHz TX
1 2 6 7
AT Keyboard PS/2
Figure 8-2 Serial keyboard transmitter.
RECEIVER 111
1/ -wave 4
vertical antenna
RX/TX Circuit board ground
Figure 8-3 Vertical quarter-wave antenna.
1/ -wave 2
dipole antenna
RX/TX Circuit ground Figure 8-4 Half-wave dipole antenna.
receiver. A 5-V power source is applied to pins 1, 10, 12, and 15. Ground is applied to pins 2, 7, and 11. A quarter-wave vertical or half-wave horizontal dipole antenna is connected to pin 3. Pin 13 is designated a test pin. In our 12-channel remote control system, pin 14 is used as the data output pin to the STAMP 2 controller. The heart of the 12-channel radio remote control system is the alternative BASIC STAMP 2 microprocessor at U1 in Fig. 8-7. The receiver module is connected directly to the STAMP 2 via receiver output on pin 14, which is used to convey data to the STAMP 2. Remember the add 10 rule on alternative STAMP 2; P0 is really pin 10. The MAX232 chip converts the STAMP 2 I/Os to true RS-232 serial level so that the STAMP 2 can communicate with your PC for programming. The MAX232 is connected to a DB-9 female to allow programming of the STAMP 2. You might consider installing a 4-pin male header on the PC board. Then you could make a programming
112 TWELVE-CHANNEL RADIO REMOTE CONTROL SYSTEM
AM-HRR3 receiver Component side
13 15
Pin # 1 2 3 4 5 6 7
Pin name RF VCC RF GND Data in N/C N/C N/C RF GND
Pin # 8, 9 10 11 12 13 14 15
Pin name N/C AF VCC AF GND AF VCC Test Data out AF VCC
Figure 8-5 Abacom AMHRR3 data receiver.
Antenna
RF pre-amp
RF oscillator
Low pass filter
AF amplifier
Comparator O/P
RF GND
Quench oscillator
AF GND
Test
RF GND
Figure 8-6 AM superregenerative receiver HRR3/HRR6.
cable with a 4-pin female header at one end and a DB-9 at the other end. The MAX232 requires only four external capacitors to operate. The DTR pin, or pin 4, of the DB-9 is connected to pin 13 of the MAX232, and the RX pin 2 is connected to pin 14 of U3. The TX pin 3 of J1 is fed to pin 14 on the U3 and ground on J1 is connected to the system ground. Pushbutton S1 is utilized as a system reset button, which shorts pin 28 to ground momentarily. The alternative STAMP 2 processor requires a 24LC16B serial EEPROM memory chip, shown at U2. Pins 5 and 6 of the EEPROM are coupled to the STAMP 2 via pins 6 and 7. Most of the STAMP 2 I/O pins are used as outputs in this application. Beginning with P4 and continuing though P15, these outputs are all used to drive transistors, i.e., Q1 through Q12. The transistors are utilized to drive relays from RY1 through RY12. The relays are low-voltage, low-current SPST minirelays. The twelve-channel radio remote control was built on a 4- by 6-in circuit board. The relays occupy most of the real estate on the controller s PC board. The receiver, STAMP 2,
RY12 RY11 RY10 D11 RY9 +5V RY7 D8 RY6 RY5 +5V D6 +5V RY4 D5 Antenna
D13 D12 Q11 Q10
3 2 1 5 6 6 7
DB-9 XTL RESET S1
5 6 7
RY8 D9 Q7
U2 D10 Q8 R12 Q9 R R R R 14 15 16 13
DSR RTS GND
26 27
U1 R2 12 U3
13 28 8 9 9 11 10 8 14 7 + 16 1 3 4 5 15 +
R4 +5V
DTR TX RX
R11 Q6 R10 R9 Q4 RY3 Q3 R7 RY2 R6 Q2 R5 Q1 RY1 R8
D7 Q5
+5V D4
P15 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 P0
D1 R1
+5 C6
1 + + 4 2 6
J1 C4
12 3
AM HRR3 418MHz receiver
7 10 15
+5V C7 D3 D2 +5V
+5V O C2
+9 12V C1
Figure 8-7 Remote control system receiver and controller.
114 TWELVE-CHANNEL RADIO REMOTE CONTROL SYSTEM
and support chips fill one end of the board and the relays and transistors fill the rest of the PC board. It is important to keep the distances from the receiver to the STAMP 2 and from the receiver to its power source as short as possible. When constructing the receiver/controller board, be sure to use IC sockets, in case a board problem ever develops. Take care, when installing the ICs, to orient them correctly into the IC socket. Every integrated circuit contains either a notch cut into the top or a small circle cut-out on the top left of the IC to indicate the top of the IC. There are quite a few diodes on the PC board, so care should be taken to observe polarity when installing them. Also be careful when installing the electrolytic capacitors around the MAX232 as well as around the regulator chip. The LM7805 regulator at U4 provides 5 Vdc to power the receiver and STAMP 2. A 9to 12-V wall wart power supply could be used to power the regulator. You will need to create a quarter-wave vertical antenna or a half-wave dipole for the receiver/controller, as you did with the transmitter. Be sure to use the same polarization for both antennas. If you use a vertical antenna for the transmitter, you must also use a vertical antenna for the receiver. Once the main circuit board is completed, be sure to carefully recheck it to ensure correct polarity for the diodes, capacitors, and integrated circuits. Once this has been completed, you can make up a programming cable, apply power to the system, and perform a smoke test. If everything appears OK, then you can proceed to load the receiver/controller program from your PC into your BASIC STAMP 2. First, you will need to locate the STAMP 2 Windows editor program named STAMPW.EXE from the CD-ROM. Next, you will need to connect up your programming cable between your personal computer and the receiver/controller. Now, apply power to the receiver/controller board and download RADREMOTE.BS2 (Listing 8-1) to your receiver/controller board. Using the 12-channel radio remote control is simple. With the keyboard installed and transmitter and receiver/controller switched on, you can, for example, type A0 on the keyboard to turn on the first control relay. Pressing A0 once again turns off lamp 1. Activating relay 12 is accomplished by pressing A11; turning relay 12 off is accomplished by pressing A11 once again. Your 12-channel radio remote control system is now ready to serve you!
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