iAccess--an intelligent access control system （5）

Published:2011/7/28 21:01:00 Author:Li xiao na From:SeekIC

Design by I. Joostens

Basic settings

Provisionally connect four pushbutton switches to the S1-S4 positions on the circuit board. These buttons have the following functions: SI = Reset, S2 = Enter, S3 = Down, S4 = Up.

Also provisionally connect an iButton probe to pins 1 and 3 of K2, with the centre contact of the probe attached to pin 1 and the outer contact connected to pin 3.

Press and hold the Up button. Briefly press the Reset button and wait approximately two seconds, then release the Up button. The system will enter the configuration mode and display a menu on the LCD. You can now use the Up and Down buttons to page through the various menu options. Do so until the option ’Output 1 properties’ appears, and then press Enter. Then select ’Output type _Mono’ (you can use the Up and Down buttons to select one of two options: ’_Mono’ or ’Bi’). Press Enter and select a time, such as ’Output delay _05 s’. Press Up or Down until a time of 5 seconds is set; then press Enter. You will be returned to the main menu. Now select the option ’Output 2 properties’, and under this option select ’Output type _Bi’ as the output type. Pressing Enter will again return you to the main menu. The door opener interface has thus been configured as a monostable interface with a period of 5 seconds, and the relay output has been configured as bistable.

Select the ’Output current:’ option in the main menu and press Enter. Then use Up and Down to select ’Set _AC current’ and press Enter.

There is little point in setting the time before the board has been fully fitted in its enclosure and the lead-acid battery has been connected. Select ’Program new key’ and press Enter. The message Apply key to reader’ will appear on the LCD. Hold an iButton against the iButton probe. Once the key has been correctly read, you will hear a short beep, and the physical key number will be shown for 2 seconds on the LCD. After this, ’Select key nr. _001’ will appear. After you press Enter, the key will be stored under number 1. If you wish, you can use Up and Down to select a different key number in the range 1-125 before pressing Enter. Key numbers already in use are marked by a # sign (e.g. _065#).

Finally, select ’Return to runmode’ in the main menu and press Enter. The system will execute a reset and return to the run mode. Now disconnect the middle lead of the iButton probe and connect it to pin 2 of K2. After this, each time the iButton that has just been programmed into the system is held against the reader probe, relay RE1 should be actuated. You can also test the door opener interface by again connecting the iButton probe to pins 1 and 3 of K2. Connect a load to K8 that can handle a 12-V AC voltage. If you use a ’heavy’ load (> 300 mA), you must connect the lead-acid battery to K6 and allow it to charge if necessary. Each time the iButton is held against the reader probe, power will be applied to the load for 5 seconds.

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