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FIGURE 18.3 A digital oscilloscope trace of the tone generated by the toy.
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AVR PROJECT 10: AVR PROTOBOARD FOR NUTS
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19.1 At a Glance
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A simple and inexpensive application prototyping board. Uses the STK200 dongle for program download. Uses Atmel AVR ISP software for project management. Offers a general-purpose prototyping area to add custom hardware. Allows all classic 20-pin AVR controllers to be used. Can be modified to suit other AVR processors.
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19.2 Introduction
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This chapter looks at a simple and inexpensive prototyping board for developing AVR applications. However, I want to make it clear that some really inexpensive and compact prototyping and evaluation boards are available through Atmel. These boards have more features and
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310 AVR PROJECT 10: AVR PROTOBOARD FOR NUTS
hardware capability than the one described here, and I strongly recommend that users buy one or more of those boards (STK200, STK300 etc.). These boards are priced very competitively. Therefore, only such users who want to quickly evaluate AVR processors before seriously committing any resources or those who are really constrained should consider building the protoboard described here. This project is targeted towards Nuts (no offense intended), elsewhere called Dummies. Here is my own, very own, Protoboard for these Nuts. The design is suitable for use in a college laboratory (which has access to a PC) or a NutShack. The design allows an experimenter Nut (henceforth called eNut) to play with all the hardware features of the AVR controller: serial port, timers, analog comparator, interrupts, and various sleep and power-down modes. The in-system programming circuit allows the eNut to download programs from the PC parallel port to the protoboard. Figure 19.1 illustrates the block diagram of the protoboard and Figure 19.2 illustrates how the protoboard connects to the PC development system through the parallel-portbased dongle. The AVR protoboard has an ISP port, and the parallel port dongle connects to this port through a ribbon cable and a mating box connector.
19.3 Design Description
The prototype board is not much of a design. The circuit consists of a crystal oscillator, which I have set to 3.58 MHz, a MAX232 chip for RS-232 data translation, and an ISP programming header for serial programming of the AVR chips. A manual reset circuit is
AVR Processor 10 uF RST 3.58 MHz
10 pin box headers
PortD RxD PortB TxD ISP Port
To PC MAX232 Serial Port
AVR Processor Experimentor s Board
FIGURE 19.1 AVR Protoboard for Nuts.
DESIGN DESCRIPTION 311
PC Parallel Port Dongle AVR Protoboard
ISP Port
FIGURE 19.2 Connecting the AVR Protoboard to the PC for program download using the ISP port.
also provided. Figure 19.3 illustrates the prototype board circuit and Figure 19.4 is a photograph of the completed circuit board. The PortD and PortB signals are terminated on 10pin box-header connectors. Users can create their own circuits with matching connectors for connecting peripheral devices. The circuit must be operated at a regulated 5-V power supply. The programmer dongle that connects to the PC through the PC parallel port on one end and the ISP header on the header is illustrated in Figure 19.5. The circuit consists of a 74LS244 buffer, a capacitor, a signal diode 1N4148, and a 100-K resistor. The 244 buffer circuit ensures that the parallel port signals can drive the serial programming signals of the AVR processor in the target circuit of the protoboard. The buffer is used to write and read program memory and EEPROM (as desired) to and from the AVR processor into the PC. Figure 19.6 is a photograph of the dongle circuit board. This dongle and the prototype board use the Atmel AVR ISP software developed by Kanda Systems, and they have very kindly provided a copy of this software to be included on the accompanying CD.
312 AVR PROJECT 10: AVR PROTOBOARD FOR NUTS
FIGURE 19.3 AVR Protoboard circuit schematic.
DESIGN DESCRIPTION
FIGURE 19.4 Photograph of the completed AVR Protoboard.
314 AVR PROJECT 10: AVR PROTOBOARD FOR NUTS
FIGURE 19.5 Printer port dongle to program the AVR Protoboard.
DESIGN DESCRIPTION 315
FIGURE 19.6 The printer port dongle to connect the AVR Protoboard to the PC.
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IDEAS FOR PROJECTS
20.1 AT90S2343 Controller-based Code Authenticator
The idea of this circuit is to provide a very simple code authentication scheme. The circuit is based on the AT90S2343 AVR controller. It has three input keys and two output LEDs for visual feedback. These LED outputs are also used to provide a Valid signal when the entered key sequence is correct. The input keys are labeled 0, 1, and New. To enter a key sequence, the New key is pressed followed by the sequence of keys for the code, 0 or 1. After each key press, the Ack LED indicates that the key press is recognized. For an error, the Ack and the OK LEDs blink alternately. If the entered key sequence is correct, both of these LEDs go ON at the same time and stay on for five seconds (Figure 20.1).
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