Olympic lockers

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Type Infrastructure
Status Proposed
Origin Project
Location In the space
Maintainers JasperWallace

[[image::File:None.pngInfrastructureProposedProjectIn the space[[maintainers::JasperWallace]]

We got some lockers from ebay: http://www.ebay.co.uk/itm/2-Door-Metal-Staff-Electronic-Keypad-Locker-Blue-and-Grey-Finish-/121122632797

They use cheap Chinese electronic locks, which we'd like to automate.

The locks take 4xAAA batteries, and have a reset push button of some sort under the battery cover on the inside.

There is a USB mini-B connector on the bottom of the keypad, externally.

There are three LEDs on the outside: amber (code failed), red (battery low), and green (opening).

Some of the locks are glued to the doors.

Mode of operation


  1. Key in a code, hit hash. It locks shut (you can do this before you shut the door, as the bolt is sprung and it will latch).
  2. Key in the same code, hit hash. It opens.


  • The bolt is sprung, and will return to whichever position it's set in regardless of power state.
  • The lock's "locked" state is based on the position of the bolt, which you can push in. So if you've forgotten the code, and the door is open, you can just hold the bolt into the open position and it'll accept a new code (as in step 1). It'll remain in the shut state until you enter the code again.
  • Codes seem to be remembered across battery removal, at least in the short term.
  • There appears to be some kind of internal power source, as after the batteries are removed, holding the "reset" button will illuminate the red light for a few seconds. Then (I think) the code is forgotten (although the lock is still not open!).
  • Presumably there is a master code for letting you unlock a forgotten code, or else the USB connector has something to do with it. However, the USB connector does not appear to present a USB device.
  • The USB connector can be used to power the lock in the case of a battery failure, however with a fairly modern Macbook Pro as a power source this was very intermittent (how intermittent seems to vary between locks). Repeatedly cycling the USB power until pressing a key made a beeping sound meant that the lock could be used as normal, powered via USB.
  • My suspicion is that the USB connector is intended to be used with a dumb USB charger-style device rather than a computer.


MODEL: SN-DJ500 PATENT NO.:200820095244.2

QA sticker is damaged.

Patent (english translation) belongs to Shenzhen ZFD Industry Co., Ltd.

20130709 213452.jpg 20130709 222846.jpg

Motor board

Silkscreen says "SEPON-PW-206HT-C V1.3x110608". Jumpers for power and motor testing.

Motor connector:

  • M+ (yellow)
  • M- (white)
  • VCC (red)
  • GND (black)
  • MTEST2 (blue)

Keypad connector:

  • M+
  • M-
  • GND
  • VCC
  • MTEST2

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Keypad board

Chip is painted, but is still visibly a Holtek HT66F40:

P3250010 (cropped).jpg

Board has sticker on:

P/N:0012 14298

Silkscreen says "SEPON-PW206BHT-A V1.1x110105"

There's a header on the left (from chip side) labelled JISP, with pins:

  • 3V
  • RST
  • GNS
  • ISCK
  • DATA

and in the middle at the bottom, a USB breakout:

  • GND
  • D+
  • VCC
  • ИC (sic)
  • D-

P/N is reprinted variously around the board as S/N.

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To do

  • Take a keypad apart
  • Work out how to run power to a locker
    • has a + and - solder pads we can use
  • Work out how to lock and unlock a locker
    • the motor needs to be run in both directions, there is a micro switch that is engaged (or disengaged) when the lock is open.
  • Wire up and arduino (or something) all of them.