ELECTRONIC VOTING
MACHINE
(EVM)
Presented by: Miss.Kenyir Olga Nongrum, NIC
for Election Dept.Jowai.
Introduction to EVM
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It is a reliable machine for conducting Elections.
Has mainly 2 units: Ballot and Control Units.
Operates on a Special Battery
Tamper-proof
Information recorded is retained in memory even
when the battery is removed.
• Manufactured by Electronics Corporation of
India & Bharat Electronics Ltd. and approved by
Election Commission, India.
• Easily portable
Units
• Each Unit has been provided a casing.
• Once opened 3 things will be found:
Control unit, Ballot Unit and the
Interconnecting Cable.
Control Unit
Ballot Unit
Cable
Battery
• They are Special batteries supplied
separately
• These batteries have a Seal which should
be removed before Using
• They have an active lifetime of 24 hours.
DETAILS of Units
1.

Ballot Unit
Used by Voters for casting their votes.

It consists of :
Ready Lamp
BJP
Candidate buttons(16)
Congress
Interconnecting Cable
Candidate lamps(16)
Ballot paper
Screen
Details of Interconnecting Cable
• It is a flat protected cable and who’s one end is
connected to the Ballot Unit permanently while the
other end is attached VIA a connector to the Control
unit.
• Make sure that the cable is properly secured to the
Control unit.
Cable
TOP
15 PIN CONNECTOR
SPRING CLIPS
Details of Ballot Unit
• Ready lamp glows GREEN when Ballot button on
Control Unit is pressed by P.O. to enable voting. Goes
Off when voter has finished casting his vote.
• Slide Switch Panel used to set anyone of the 4 options:
1,2,3,or 4. ie. For 1 ballot unit Switch is set to 1 and so
on…
• Candidates lamp: glows RED when the voter has
pressed the candidate button pertaining to the candidate
of his choice.
• Ballot paper Screen: where the Ballot Paper with name,
sr,no., Symbol of contesting candidates is inserted.
• Masking tabs provided under the Candidate buttons. So
depending on the no. of candidates contesting, the tabs
are unmasked. Ones not in use are masked.
2. Control Unit
• Controls the polling process.
• Operated only by P.O.
• Consists of:
ON lamp
4 sections
in all
Busy lamp
Display
Section
Candidate Set
Section
Result Section
Ballot Section
Details of Control Unit
• Display section has: 2 lamps: On and Busy ; also 2 display
panels: one of 2 digit and other of 4 digit displays.
• Candidate Set Section: has a cover opening l-r: we see a left
compartment which accommodates the Battery and the right one
a Red Cad Set button. This section is closed by thread Seal.
• Result Section: also has same cover as above. On opening we find
the left side has a Black Close button while right side has inner
compartment with its own door. One button her is result 1
button. used for one type of election only: like only single Poll.
Result 2 used for both types conducted at the same time, Clear
button. Provision kept for a seal in the cover of this inner compt.
and thread seal too.
• Ballot Section: has 2 buttons , a gray Total button and a large
Ballot button.
• Bottom of C.Unit also open for plugging the cable from b.unit and
a power switch to switch EVM On/Off.
Lamps details….
• On lamp: in display section will glow GREEN
when Control Unit Power switch is put ON,
indicating EVM is ready for use.
• Busy lamp: in display section glows RED when
Ballot button is pressed by P.O. to enable voter
to cast vote. Goes Off when over.
Display Panel details
2 DIGIT DISPLAY
• LE: link error: ie. Interconnecting cable not
properly connected.
• PE: Pressed error, where any of the
candidates buttons in Ballot unit are
jammed or kept pressed.
• Er: Memory Error: Control unit not fit to
use.
Display Panel details
4 DIGIT DISPLAY
• no: indicates a button pressed on Control
unit is pressed out of sequence.
• End: End of display sequence after
pressing Close , Result or clear button.
• Full : indicates max no.of votes for which
machine is designed. 9999 is the max.
Display on both panels
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nP 1 : machine set for Single poll only.
Cd 6 : machine set for 6 candidates.
to 1234: total no. of votes casted = 1234
06 234: candidate 6 has 234 votes in his
favor.
Beeps
• A beep of not less than 2 seconds after a
voter casted his vote.
• A beep of 1 second, when displaying
information on display units.
• Short interrupted beeps to show
malfunctioning , disconnection, errors….
Control Unit buttons
• Cand Set: used to set EVM for no. of candidates contesting the
election.
• Clear: pressed before start of a poll: to clear machine of recorded
informations. Used when election is over/ not done w/o orders.
• Ballot: enables voter to record his vote: so once pressed: the BUSY
lamp goes Red, Ready lamp of C.Unit goes Green and voter can
now caste his vote. Then Pressed again to allow next voter to
record his vote….
• Total: shows no. of candidates and total no. of votes recorded so far.
Pressed at anytime: to see the same. But not when Busy lamp is
ON.
• Close: Once pressed: no further voting can take place. Only pressed
at the end of the Poll. When Pressed the no. of polls, no. of
candidates, total votes polled and the word end will be displayed.
• Result: when EVM is used for simultaneous poll: ie Lok Sabha &
Legislative assembly polls , both Result 1 & 2 are used ie. R1 for
Loksabha,R2 for LA. When only single Poll, only R1 is used. In our
case Only Result 1 USED. When Pressed it will display in
sequence the no. of candidates, total no. of votes polled, votes for
each candidates. The finally displays END. This button can be
pressed as reqd.
SEQUENCE OF BUTTONS TO BE
PRESSED ON CONTROL UNIT
CAND. SET
RESULT 1
CLOSE
CLEAR
RESULT 2
BALLOT
The EVM as it looks…..
Ballot Unit
Control Unit