ledstumppic - Make this LED Cricket Stump Circuit at home

Make this LED Cricket Stump Circuit at home

In this post we learn how to make an LED cricket stump for helping umpires declare a foolproof OUT, NOT-OUT decisions.

You might be seeing these amazing cricket stumps in the ongoing 2015 ICC world cup cricket matches, which can be seen dazzle or light up brightly as soon the ball hits any one of the stumps.

ledstumppic 1 - Make this LED Cricket Stump Circuit at home

It's invented by an Australian person named Bronte EcKermann and created by South Australian manufacturer Zing International.

It is said that the cost of these stumps may be as high as US$ 40,000 for each set, gosh!. The circuit of these LED stumps is assumed to be consisting of all sorts of complex designs using microcontrollers.

In this article we'll learn how each of these circuits can be built using ordinary components at less than $5 and yet be as effective as the original LED stump specs.

The first diagram below shows a circuit which may be employed inside the bails, the idea may be understood as follows:  

LEDstumpcircuit 1 - Make this LED Cricket Stump Circuit at home

 The IC1 which is an IC 555 is configured as a monostable wherein R3 and C2 along with R4 decides the ON time of the LEDs.

An NPN  transistor T1 can be seen attached with pin2 trigger input of the IC, whose base is rigged with a couple of reed switches in series.

The idea is simple: The entire circuit is required to be fixed inside each of the bails with the reed switches enclosed inside the end tubes of the bails. Furthermore, a permanent magnet needs to be fixed at the upper ends of the stumps so that the reed switches remain closed for so long as these are held over the stumps.

ledstump 1 - Make this LED Cricket Stump Circuit at home

The figure above shows how the magnets inside the stumps needs to be embedded and positioned for the bails to respond to these. 

As long as the bails are held over the stumps, the reed switches stay closed ensuring a switched OFF T1. However the moment the bail is completely dislodged from the slots, allows the reed switches to open and switch ON T1 which in turn triggers the monostable illuminating the LEDs for a time period as determined by R3/R4/C2. The LEDs remain shut off until these are yet again positioned over the stumps for a repetition.

That takes care of the bail circuitry, pretty simple.... isn't that?

In the above diagram we can also see LDRs being positioned right at the top of the stumps just under small apertures that my be drilled on top surfaces of the stumps.

These LDRs become exposed to the ambient external light the moment the bails are dislodged from the slots. since these LDrs are supposed to be integrated with sets of identical monostables inside the stumps, the operation becomes responsible for illuminating the LEDs attached on the stumps, thus the entire system consisting of the stumps and the bails become synchronized providing a foolproof sequence of the proceedings.

The following circuit shows how the circuit inside the stumps needs to be configured for implementing the LED stump circuit operations.

LEDwicketscircuit 1 - Make this LED Cricket Stump Circuit at home

In the diagram we are able to witness the integration methods of the LDRs with a 555 IC based monostable.

As long as the bails are held over the stumps, the ambient light stay blocked from the LDRs which keeps T1 switched OFF. but the moment the bails are thrown of the stumps, the LDRs become exposed to the ambient light enabling T1 to receive a biasing voltage which in turn triggers the monostable so that the LEDs are illuminated for the set period of time fixed by the relevant components.

The LEDs shut of after the set time has elapsed until the bails are restored over the stumps for yet another cycle.

Designed by: Swagatam.

Parts List for the above explained LED cricket stump circuit

R1 = 220K
R2, R4, R5 = 10k
R6, R7 = 220 ohms
R3 = 1M preset
C1 = 0.22uF
C2 = 100uF/16V
C3 = 0.01uF
T1 = BC547
IC1 = NE555

35 thoughts on “Make this LED Cricket Stump Circuit at home

  1. Have questions? Please feel free to post them through comments! Comments will be moderated and solved ASAP.
  2. Nice work is what you always keep doing and that's good of you……..Anyway good day sir, I have a problem and what your help, I have been given an inverter circuit diagram by my lecture to build as my final year project and i have been able to find most of the components but there are two remaining ICs am not getting and hoping if you will show me an alternative or if possible universal ICs for them……… LM741 and CNY17… THANH YOU.

    • thanks! you can use any equivalent opamp in place of the IC 741 such LM301, 318, 709, ca3130, ca3140, LF355/356/357, TL071/081 etc and for the CNY17 you can use any 4 pin optocoupler such as 4N35 etc

  3. Hi dear Sir,
    Really Nice circuit. When I see this circuit in your blog I compared the stump price with our indian currancy it takes around 25 lakh but you show that circuit in very easy way whose cost very less nearly equal to not more than 400Rs.
    But Some question arise in my mind after watching Ireland And UAE Match in that match The Ball Just Touches stump and Suddenly LED Inside Stump And Bails Glow but due to Bails not Falls down from stump the batsman not given Out.My Question is that is this your circuit gives that Kind Of Accuracy Like that Acuracy Used In International Match Now Days.Sorry for Bad English

    Thanks Regards.

    • Thanks Swapnil,

      the bails should never light up just with mere vibration or brushing of the ball, it should illuminate only if it's truly dislodged from the stump slots, otherwise the whole purpose of the system would fail.

      The circuit above takes care of this criterion and thus produces a failproof indication for the same.

      however the reaction time of the above circuit would be in microseconds.

  4. Sir,
    What needs to be done to avoid the LEDs from blinking??
    Does the above reduce the complications in the circuit??
    Then what will be the new circuit diagram for the above??
    Hope you will reply..
    Thank You

    • use 7(555) IC instead of 555, it'll last much long.

      using arduino or wireless circuit will make this simple design unnecessarily complex and beyond the reach of ordinary hobbyist, so I don't recommended that.

      the idea here is to produce a simple, cheap and effective version using ordinary parts.

  5. this is the dream of mine to have these LED stumps because i love cricket and i play too much i have made stumps by own and colour it beautifully but now i want to make LED stumps plz help me in a simple common way to make a proper LED stumps plz plz

  6. Hello, i am confuse in the operation of reed switch help me out,as we know when we take magnet near reed switch circuit becomes close current can pass and led blink, but in this case magnet is always in top of stump so led always blink because magnet is near reed switch and crcuit close so current flow. Please help me out.

    • Hello, in this circuit as long as the reed remains closed, the transistor stays disabled which keeps the circuit also disabled, but when the reed opens the transistor triggers and activates the circuit and the LEDs

  7. Thanks for reply,
    I have another question, here capacitor 1= 0.22 micro farad
    Capacitor 3= 0.01 micro farad in this case please specify the voltage as specify in capacitor 2. Because there are so many types of capacitor available with same rating .

    • All capacitors are standard type and does not require to be specified, just give the dealer the "uF" values and tell him it's for a 9V battery operated circuit and he will understand what to give.

    • Hi Haseeb, the simplest idea would be to replace the red LEDs with the RGB flashing LEDs which do not require any external circuit to blink rather automatically change color and blink when connected with a supply source.

    • you can remove and replace the resistor from the strips with a calculated one and use it with the recommended 9V supply.

      Old R/New R = 12/9….use this formula for the new resistance

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