Game Circuit for Steady Hand

Game Circuit for Steady Hand

Hi, friends here I am presenting a game named Steady Hand which is can be use to check the state of sobriety. This is the electronics games that you can built for your birthday party, friends outs or even for your mid term project or final project too. I have develop a simple formula which help you to understand the game that is :

Percentage of Soberness = K(n/(1-n)x S)


K = a constant

n = clever factor (< 1)

S = steady factor

Now, let us talk about the game. Let me warn you here! A good (I repeat good) skill is required to prepare this module. So far as the electronic part is concerned, you can jump at it with your n 0.5 and above, but there is a good deal of craftsmanship involved in it which is not at all electronic. In fact, this latter part is the thing that really matters. The electronic part gives only the audio measure of the steadiness factor achieved. Let us start now.

This is somewhat similar to the age-old steady hand testing game with, of course, a bit of improvement. There are four test sectors in it, each being more than the other successively. Then, there are stoppers, called end_ sectors, to recognise the win of each sector. (These sectors or hurdles will' tickle your imagination—of course, if you don‘t copy the ones given here). A probe has to be passed through these sectors. Whenever an unsteady hand lets the probe touch any of these sectors, an audio-visual signal announces the failure. The pitch of the audio signal (well, of course not the visual one) increases with the degree of complexity of each sector. The end sectors give the lowest pitch; announcing the win.


R1 82 KΩ
R2 18 KΩ
hmR3 33 KΩ
R4 22 KΩ
R5 120 KΩ
R6 10 KΩ
R7 820 Ω
R8 2.2 KΩ
C1 0.015 μF Ceramic disc
C2 10 μF 10V electrolytic
C3 0.01 μF ceramic disc
IC1 NE555 Timer
IC2 CD4016 quad analogue switches
D1 to D5 1N4001
D6 5mm LED
LS 8-ohm Loudspeaker
- aluminium rods, aluminium angles, IC sockets, enclosure and hardware...etc



PCB layout
PCB Layout for the Circuit.


The electronic part of the project is an oscillator built around IC 555. The reset pin 4 of 555, is not connected directly to the positive bus. Rather, it is connected to ground through R8 on one hand and to the sectors on the other hand. There is a probe, connected to the positive of the supply which has to be passed through the sectors. Whenever the probe touches any of the sectors, the positive rail of the supply is applied to the pin 4 of IC1 (NE555) via D1 to D4 and it starts oscillating.

The frequency of this oscillation, and hence the output tone, is controlled by the resistors R1 through R5 between pin 6 and pin 7 of 555. Analogue switches, S1 to S4 (in IC2 CD 4016) are connected across the resistors R1 to R4 in a manner such that S1, when operated, S2 shorts both R1 and R2 and so on. Thus, by activating switches S1, S2 etc the effective resistance between pins 6 and pin 7 of 555 is reduced. The control pins of the switches are connected to the four sectors of the model. Thus, whenever the probe touches the sectors, a control voltage is applied to the corresponding switch, and it is activated. The combination of sectors, switches and resistances is arranged in such a way that the frequency of the output increases with the complexity of the sectors. The circuit can be easily assembled on a veroboard. But if desire , a small PCB can also be made

Related Project

  1. Electronics Cricket on Board interesting project, even a single player can play this game.
  2. Programmable Electronics Dice we can display any number between 1 to 9 according to our dip switch setting.
  3. Electronics Gambling Game Play gambling game in your own project