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Data on 75176
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75176 Data Enable ( DE ) Control from PIC16F877
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Remote thermometer ISA command to remote thermometer circuit.
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Data on 75176
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75176 Data Enable fro,m PIC16HV540
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5 Volt 5 Volt
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Figure 21.42 returned.
ISA command to remote thermometer circuit and temperature
PROJECTS
Data on 75176
75176 Data Enable ( DE ) Control from PIC16F877
1) Ch 1 2) Ch 2
5 Volt 5 Volt
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Figure 21.43 The voltage levels on the RS-485 lines when the remote thermometer circuit is disconnected.
If the remote PIC microcontroller is disconnected or cannot respond in any other way, the PIC16F877 will experience the data shown in Fig. 21.43. When the RS-485 voltage goes to the half-voltage level, the 75176 will convert that to a low with periodic voltage spikes. The voltage spikes are caused by noise on the RS-485 lines that differ enough for the differential input drivers to interpret them as high-voltage values. These spikes are the reason why I poll the line for 10 ms before accepting a low-voltage level as a valid NRZ serial character in the remote PIC microcontroller. When the low data is received by the PIC16F877 s USART, the data is interpreted as an invalid character (it is not in 8-N-1) format, and the FERR (framing error) bit of the RCSTA register is set. This bit indicates that when a high value was expected for the Stop bit, a low was received. To clear this error, I reset the USART before transmitting the ping character. As I ve indicated, this is not a terribly hard circuit to build. I recommend that you do test the two cards and their connections on a bench using the power supplies I outlined earlier to avoid the need to power up and power down the PC to debug the application. Something to keep in mind is that it is often quite dif cult probing a card inside a complete system, especially if there are other cards in the system. On the bench, with the two cards hooked up and working correctly, you should see the LED ash on and off at a rate of once per second. I was not able to get an LED connected to the PIC16HV540 to work because of the low current source and sink capabilities of the chip. Once the LED is ashing (and you can stop it by disconnecting the remote
MID-RANGE DEVICES
PIC microcontroller), you can test it out in your PC. By debugging the communications circuitry outside the system, you will nd it to be quite easy to debug the circuit as well. If you build this circuit for another system, I recommend that you rst try to communicate with the remote PIC microcontroller using a debugger or monitor program that allows you to read and write devices on the I/O bus. When I first tested the ISA card and connections in the PC, I used MS-DOS debug rather than going directly to the Visual Basic application. You should be able to peek into the PIC16F877 to see what the current temperature value is. If you have wired up your bus interface correctly, you will be surprised to see temperatures being returned from the PIC microcontroller.
SERVO CONTROLLER
This project really demonstrates what kind of complete applications can be implemented with the PIC microcontroller. The servo-controller project uses a 16C71 to provide a text user interface with an LCD and allows the user to control up to four servos, develop a sequence of events for the servos to run, and allow the user to save a sequence for later execution (Fig. 21.44). It s a pretty impressive application for an 8-bit microcontroller with only 18 I/O pins. This project is designed for controlling the servos used in armature robots or mechanical displays that require moving parts; the servos can be controlled either individually or sequenced. There are a number of companies that make similar applications for sale for several hundreds of dollars even using new parts, you can do it for $20 or less. The schematic is shown in Fig. 21.45, and you should notice that a lot of the lines are actually Vcc or ground. One thing to point out in this schematic is that I did not include the power for the 74LS174. Pin 16 is connected to Vcc and pin 8 to ground. Table 21.19 lists the project s bill of materials.
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