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29-09-2017, 05:48 PM

Code for electronic quiz table using 8085

jaseela123d · 30-09-2017, 09:52 AM

Here is a simple, low-cost question table for four game participants. Determine the contestant who first presses the switch (S1 to S4) to answer a question and blocks the remaining three entries. Simultaneously, the respective audio alarm sounds and the bulb shines. The contest table can be used for more number of contestants simply by adding buzzers, light bulbs, MOSFETs and diodes. In addition, it provides an option to vary the time during which an individual buzzer and the corresponding bulb must be turned on after a particular competitor has pressed the push button. These times can be adjusted using presets VR1 to VR4 as required.

The circuit works off 12V, 1.5A power supply. The nominal current of the power supply must be according to the load (power of the bulbs). For higher power bulbs, use a higher current source.

If participant A pushes switch S1, the MOSFET T1 is activated and the corresponding bulb BL1 (connected between the MOSFET drain and the 12V supply) is switched on and simultaneously the piezobuzzer PZ1 connected in parallel to the BL1 bulb is sounded during the time preset. At the same time, the capacitor C1 charges up to 12V, which is then discharged through the preset VR1. The discharge time of the capacitor C1 is decided by the preset VR1. For example, if the preset VR1 is set to a resistor of 4.7 k, it will give a delay of approximately 4 seconds, which means that the buzzer PZ1 and the BL1 bulb will remain on for 4 seconds. It also indicates that participant A is the first to push his switch. Even if any other participant, eg participant B, presses switch S2 after participant A has already pressed switch S1, buzzer PZ2 and bulb BL2 will not work since the T2 MOSFET has no gate voltage to trip because it is connected to ground by R2 and D1.

The same principle applies to other contestants as well. Instead of bulbs, you can also use a group of LEDs. Figure 2 shows the configuration of the electronic question table.

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