.net barcode scanner sdk PROGRAMMING PIC MICROCONTROLLERS in Software

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Figure 4.31 The PTH PIC microcontroller El Cheapo installation options.
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a single ZIF socket will cost three or four times what the other sockets on the board cost, but they will make using the programmer a lot easier. The 14-pin socket is used to program both 8- and 14-pin devices, just the same way as the 40-pin socket programs both as does the 40- and 28-pin chips. They are combined as shown in Fig. 4.31. While a simple 14-pin DIP socket can be used for the 8/14-pin PIC microcontroller devices, the 28- and 40-pin PIC microcontrollers use a slightly different arrangement. The 28-pin PIC microcontrollers are built as 0.300in skinny DIPs. The combined socket uses a cut-up 40-pin socket along with a SIP connector that was cut from another socket. This socket is not wired for a ZIF socket. When building the El Cheapo, I suggest that you do it in the order that I have listed below and stop and check after each point as I indicate. This process is also given in the Windows software under the Build/Test option.
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1 First test the power connector (J1) with the AC/DC power supply that you have
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selected. This is done by plugging the power connector into the power supply and plugging the power supply into a wall socket followed by measuring the voltage at the connector. The two end pins of the connector should be checked with the terminal away from the connector hole being positive. The output voltage must be at least 14.5V for the El Cheapo to work properly. The actual output voltage of the power supply should be between 14.5V and 16V for the power supply to work properly. Too high and you will nd the 78L12 (U1) will get very hot during programming and could shut down. 2 Next, solder the connector onto the board along with the CR4 diode. This diode is used to rectify the power coming in and make sure that the power is positive. This diode cannot be depended upon to provide recti ed AC output. After soldering J1 and
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CR4 to the board, check the voltage at C1 to make sure that the input voltage is greater than 13.75V. If the voltage is less than 13.75V, you will have to nd another AC/DC power supply. Wire in the 13.4V power supply. In doing this, solder in C1, U1, CR2, CR3, and C4. When nished, check the voltage output with the AC/DC power supply connected to the El Cheapo board. The output should be between 13V and 14V. The two diodes, CR2 and CR3, are used to boost the voltage output from 12V to more than 13V to ensure that EPROM parts will be properly programmed. Now wire in the 5.1V power supply by soldering in R1, C2, and CR1. Note that R1 and CR1 should be capable of dissipating 0.5W of power. When there is no PIC microcontroller in any of the sockets, 40 mA will ow through CR1 and R1. This translates to 320 mW or more of power that requires the larger parts to dissipate the heat. The output should be checked with the digital multimeter checking pin 1 and pin 14 of the 14-pin socket. Solder in J2. This will be required for the following build steps. As I noted above, make sure the connector is female (with holes for accepting pins). With J2 in, the reset control circuit will be soldered in. Solder in Q1, Q2, R5, and R6 making sure that you get the transistor polarities correct before soldering in the parts. To test the reset control circuit, connect the El Cheapo to the PC and power and follow option 2 (Reset) of the El Debug program described below. Next, solder in R3, R4, C3, and CR5. This provides a hardware delay that will be used by the programmer software. This circuit is tested using option 3 (RC Delay) of El Debug. The last electronic component to install is R2. Once this is done, check the operation of the clock and data pins using El Cheapo. Finally, install the PIC microcontroller sockets. If ZIF sockets are to be used for 14- and 18-pin parts, make sure the parts are open when they are soldered in to avoid any problems with the pins being soldered into a position where they are stressed and the socket pin cannot open properly. The 28- and 40-pin socket is created by cutting the top strut from a 40-pin socket to allow the 14-pin SIP socket to be installed inside it with the same level for pin 1. The 14-pin SIP socket is cut down from a 28- or 40-pin socket and soldered in between. When installing the 14-pin socket, make sure the pins are oriented in such a way that the PIC microcontroller will be fully seated when it is installed.
If you have problems with the El Cheapo, I suggest you carry out the following steps before contacting me (because I ll just ask you to carry them out before I will respond to you):
1 Make sure that the parts are installed and soldered in the correct orientation. 2 Check the parallel cable and make sure that it is straight-through and male to male,
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