Phones with caller ID (caller ID) on the basis CPU Z80 are rarer. Some of them do lie idle, although the device is quite workable. To return it a second life by turning the phone in programmable timer, managing loads.
Among many functions of the phone with automatic call identification (caller ID) no, unfortunately, control of external loads. In these devices there is no special output port, and software support for such port. Especially this drawback in the background of the opportunities, laid in the last versions of the program (version "Rus" with number 17 and above).
The proposed device management software (TOS) - one of the options to solve the problem. Essentially, the device introduces an additional port forming digital signals to control four independent loads.
The device is based on the fact that when triggered any alarm the indicator in the left hand digit is displayed by the symbol "E". and in the following category room involved the alarm. This information captures the prefix and after decryption issue the command to enable or disable certain of the channel. Only ten such teams.
The console is built on widely available, does not contain configuration nodes that are compatible with versions of "Rus" from 17 and above. The disadvantage of the system is significant current consumption, since it consists of TTL chips. In addition, it is not guaranteed control of loads during the conversation, as when off-hook may fail alarms (work in such the mode may depend on the version of the program Aona and should be checked experimentally).
The use of the TOS can be varied. This household management electrical appliances, lighting, devices for aquarium and Programming etc. on weekdays enables operation of the system when no people, for example, during the holidays. Interestingly, the application of the UPA in "security" purposes - for simulate the presence of people in the room (turn on and off lighting, TV, etc.).
Scheme prefix shown in the figure.
(click to enlarge)
DD1 chip, controlled by signal the inclusion of the first digit of the indicator captures the appearance in this bit symbol "E". At its conclusion (10 occurs low, authorizing the work decoders DD2, DD3. These are designed to decrypt semielemental code numbers that appeared after the "E" symbol. The work of the decoder DD2 additionally Gating signal RES, which reduces the probability of false functioning during transients at power-up and powerdown.
Chip DD4 and DD5 form the encoder. The outputs of the encoder control switch channels output register DD6. carrying information about the current state loads (enabled or disabled). The system provides for the preservation of these data when the outages. For this purpose, with power outputs DD6 are translated into high-impedance state to the low level at pin 5, and the the chip receives charge from the capacitor C3. This allows you to save information for hours.
The table shows the corresponding commands to the numbers of alarms.
The trigger DD7.1 and the transistor VT1 form a node reset alarm mode. VT1 open, simulating pressing the "#" on the keypad Aona. As a result phone mode alarm status becomes hours.
The switch SA1 inhibits the operation of the system as a whole. HL1 - indicator included state.
To connect the device should be found on the Board Aona register, managing elements of the indicator (a type of chip - KIR, or foreign K555IR23 the analogs - 74LS373.74LS374, etc.). The signals A-G take with respective outputs of the register. In some units the elements of the indicator is connected to the chip without limiting resistors. For proper operation of the UPU these resistors should to install, their resistance should be between 100 and 200 Ohms. The signals T1 and T2 removed from the respective cathodes of the indicator (first and second places to the left). The RES conductor is connected to the output 26 of the Z80 processor. If the processor Aona uses the reset signal active high, particularly s. then conclusion 6 DD2 this signal must be submitted via the inverter.
To control loads can be used in different ways. Most simply it can be implemented using optocouplers or relays. Galvanic interchange circuits Aona power supply is required! It is possible to transmit commands wireless communication channel (infrared or radio channel) using respective receiving and transmitting devices.
The device incorporates resistors MLT. capacitors KM, K50-35 or imported analogues (C3 must be low leakage current). Diodes - any low silicon, the transistor VT1 - series KT315. CT, KT3102 with any letter index. Chip DDI DD5 can be replaced with counterparts from the KR1533. it will reduce power consumption.
The device is mounted on the segment development boards and placed in the case Aona. The size and shape of the fees depend on the size of the housing. Power flows from source +5 V phone.
The establishment of the TOS is to verify the preservation of information when disconnected power. For this we need to set the outputs of the channels a high level, running the command E9 (to monitor the status of channels can be connected to the outputs the LEDs). Then it repeatedly turn off and again turn on the power Aona. watching the state of the indicators. Every time I turn it must remain unchanged. After this you should repeat the test by entering a pre-command E0 (all channels disconnected). If still crashing marked, you should check the correctness of the signal RES at pin 6 of chip DD2. Can try Sasun be interpreted each of the resistors R10-R17 capacitor 1 1... ICF.
The programming system is to install appropriate alarms Aona at the right time, for the days of the week, with the switch SA1 must be in the "Will For example, to enable the second channel 20 hours must this is the time to enter in the 3rd alarm. The alarm must be installed in mode "and" single mode or "on" for multiple actuation (see instruction manual Aona). To perform any commands manually enough to take the caller ID setting mode alarm clocks combination of keys "5", then enter a number to a desired number of the command, and then press the "*" phone and the button SB1 consoles. When this command is executed, and the apparatus after the hours.
After entering all of the program device is transferred to the operating mode toggle switch SA1 (the "On" position). If there is a need to erase the entire program, you can type the combination of: "*", "*", "3". "5", "3". when all the alarms off.
While the system may be unpleasant situation. It consists in the fact that when you receive a call from the telephone line operation of the alarm is delayed. However, the alarm will not work if the corresponding moment was fully occupied the invocation. This means the passage 12 or more inductor parcels. Clearly, what are the odds of that are small.
It should be noted that the use of the device PU is useful if the caller ID able to retain information when power is off. Otherwise, crashing, caused by power interruption, can disrupt PU system, and restart Aona actually disable it. To prevent such situations apparatus it is necessary to equip failure protection, for example, made under the scheme, published in the article "So is it possible to protect the caller ID from failures?" in "Radio", 2000 G., No. 1, pp. 38 - 40.
Author: D. Nikishin, Kaluga