Security device controlled by iBUTTON tablets. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Security and alarm via mobile communication

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Below is a diagram of a security device using Touch Memory electronic keys of the DS1990A type. The device is assembled on the basis of the PIC16F628A microcontroller.

(click to enlarge)

Device Features:

• Follow the sensor (any optional, hereinafter referred to as the "loop")
• Watch out for power outages (at the outlet)
• Turn on the siren in case of alarm
• Activate an additional output (if you want to connect something of your own)
• When connecting a mobile phone by Usart, can dial numbers from the address book
• Arming and disarming using the IButton tablet (hereinafter referred to as the "Pill" or "Key")

Device parameters

• The device has parameters that are written to the EEPROM during the firmware of the controller and do not change in the future
• Below is the parameter table with the address and brief description of the parameter
• In the left column - the address of the EEPROM cell in which the parameter is located, in the right - description

By the address 7Dh there is a parameter with device configuration bits. Below is a bit table with a number and a brief description of the parameter. In the left column - the serial number of the bit, in the middle - the decimal value of the bit, in the right - description.

For example:

If you need to install 0th, 1st and 5th, but not the rest, then in bin it is 00100011 . We translate into DEC ( decimal value ) - this is 35. So we write at the address 7Dh the number 35 (in hex = 23h). If it is not clear, then do this: In the second column of the table, the decimal values ​​​​of each bit are written, if the bit needs to be set (1), then add the value corresponding to the bit, if it is not necessary to set (0), then do not add. Write the received amount to the address 7Dh.

Operation of the device

The operation of the device consists of 4 modes:

• Key programming mode
• Normal mode (out of guard)
• Security mode
• Alarm mode

Key programming mode

In the key programming mode, the LED lights up with short-term extinctions. The duration of the mode is 10 seconds. When the device is started, the controller checks if it has keys in its memory, and if not, it switches to programming mode. You can switch to the mode yourself. To do this, briefly press the "Prog" button. When reading a tablet in this mode, it is stored in the controller's memory and confirmed by a siren sound. After 10 seconds, the device switches to normal mode. You can record a maximum of 15 keys, further keys will not be recorded. Keys that already exist are not written.

Normal mode

The LED in this mode duplicates the loop, i.e. if the loop is closed, the LED is on and vice versa.

В normal mode the device is waiting to be armed. When reading an existing tablet in the memory, the device gives a short sound signal (if bit No. 5 of the parameter is set 7Dh ). After that, the delay begins, the value in seconds, which is the parameter 75h After this delay, the device switches to security mode accompanied by a sound signal (if bit No. 6 of the parameter is set 7Dh ).

Security mode

In this mode, the device monitors the cable and the voltage after the power supply. The LED in this mode blinks once per second with short flashes. When reading an existing tablet in the memory, the device gives a short sound signal (if bit No. 5 of the parameter is set 7Dh ) and goes to normal mode.

When the loop is opened, a delay begins, the value in seconds, which is the parameter 72h If bit #0 of the parameter is set 7Dh, then the device, during this delay, waits for the loop to be set to its original position (closed) and if the loop is not closed, then it turns on alarm mode. If bit No. 0 is not set, then during this delay it is necessary to disarm the device, otherwise the alarm mode.

In the event of a power failure, a delay begins, the value in seconds, which is the parameter 73 h.If power is supplied during the delay, the delay is terminated. If bit #2 of the parameter is set 7Dh, then after this delay, an additional output is activated (a logical unit is set) for a time, value in seconds, which is the parameter 74hIf bit #4 of the parameter is set 7Dh, then after this delay, dialing starts (see below).

Alarm mode

In this mode, the siren starts to sound. The playing time is set in the parameter 70 h. After this time, the device checks the loop, and if it is not closed, the cycle starts again. And so as many times as specified in the parameter 71h

If bit #1 of the parameter is set 7Dh, then the additional output is activated (a logical unit is set) for a time, value in seconds, which is the parameter 74h If bit #3 of the parameter is set 7Dh, dialing starts (see below).

If an existing tablet is read in this mode, the siren stops sounding and dialing stops (see below).

Number set

Numbers are dialed by sending a command to the mobile phone.

The device starts calling the numbers recorded in the phone book. The number of dial-in numbers is determined by the parameter 76 h. The time between calls is defined in the parameter 77 h. Those. after this time, the device starts calling the next entry in the phone book. The maximum number of rooms is 9, the minimum is 0.

Reset

Resetting the keys from the memory is done by pressing the "Reset" button. Reset occurs from any mode of the device. After the reset, the device goes into key programming mode.

Firmware can be downloaded here

The author accepts orders for the development of devices based on MK

Author: Alexey Klyushnikov, Ivanovo, al.kl [dog] mail.ru; Publication: cxem.net

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