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Well, using the dice is as simple as saying cheese. Just connect the dice to a suitable 5-V source capable of supplying a few milliamperes (25 mA or so) and you are ready to go. To adapt the circuit to run off a battery, there are two options; either to use a 9-V box battery or use four 1.5-V cells. If you want to use a 9-V box battery you could use a 78L05 voltage regulator to get the 5-V supply voltage. The 78L05 voltage regulator comes in a small TO-92 package and can be easily put on the same PCB as the dice. However, since it requires a minimum voltage of 6.7 V to provide the 5-V output, it cannot be used if you choose to use four 1.5-V cells. Using four cells of 1.5 V each will give off 6 volts, and to get 5 V out of it you could use the LP2940 voltage regulator as described in the earlier chapter on system design. You could also choose to drop the voltage to something close to 5 V with the help of two series diodes. Once you put the required power supply in place, just punch away at the sample switch and watch the dice roll off.
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10.10 Power Consumption
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As a portable utility, it will most probably be battery powered. The main concern with battery-powered devices is the power consumption, both while operating the device and when the device is not in use. The idle and power-down features of the AVR controllers come in handy in minimizing the power usage, especially when the device is not in use (Figure 10.10).
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220 AVR PROJECT 1
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+V 1.5V 1.5V 1.5V 1.5V Gnd Gnd Vout ~4.8V +9V 2 Vout=+5V 1 3
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78L05
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FIGURE 10.10 Possible sources of supply voltage for the dice circuit.
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I measured the current consumption of the device when in use and when the device was put in powered-down sleep mode.
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28.5 1 A
All 7 LEDs lit Power-down sleep with all LEDs off.
However, the key to minimizing the current consumption during the power-down sleep mode is not merely activating the power-down sleep mode in software, as I found out after some efforts. The AVR ports (PORTB and PORTD in our case) if configured in high-Z floating state or as inputs, consume quite some current (about 600 A for both the ports) even if the device is put in power-down sleep mode. To minimize this current consumption, I had to configure both the ports as outputs and I set the state of all the port bits to 1 , which resulted in a 1- A current consumption in power-down sleep mode, which is really amazing.
10.11 Adapting the Circuit to an AT90S2343
We have used a 20-pin AT90S1200 processor for this project. The project actually requires only four I/O pins three for LED outputs and one for the sample switch input. This can be easily provided by an 8-pin AT90S2343 controller. However, the controller would need to be programmed with its internal oscillator. Any AT90S2343 could be used by programming it appropriately with the help of a parallel programmer (the serial programming methods cannot change the internal oscillator fuse bit). The advantage of using an AT90S2343 in the internal RC oscillator enabled mode is that of reduced board space (an 8-pin DIP as opposed to a 20-pin DIP package) and component count, as it would not need the crystal and associated capacitors. Figure 10.11 illustrates the block diagram of the dice circuit using an AT90S2343. Porting the circuit would need modifications to the software, too. The sample switch is
ADAPTING THE CIRCUIT TO AN AT90S2343 221
Vcc +5V
RST PB0 PB1 PB3 PB2 +5V
AT90S2343 Sample
FIGURE 10.11 Block diagram for the electronic dice using an AT90S2343.
now connected to the PB3 and not PD0, as the 2343 does not have a PORTD. Secondly, the software would need to initialize the stack pointer appropriately. The AT90S1200 processor has a hardware stack that allows up to three nested subroutines. The processors in the AVR family other than the AT90S1200 use a software stack (in the internal RAM area), and so the stack pointer needs to be initialized. Once these changes are implemented, an AT90S2343 could well be used instead of the AT90S1200.
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