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A timing controller circuit diagram

A timing controller circuit diagram
This example describes an LED digital display timing controller, he can meet 3 times a day the user switch electrical timing requirements, can be used to grow bean sprouts, spray time, spray time nursery beds and a variety of regular ventilation, regular irrigation, etc. facilities, automatic timing control.
Circuit Work
The timing controller circuit consists of input control circuit, display driver circuit, reset circuit, clock oscillator, the power circuit and control the execution circuit, as shown.

Timing controller circuit diagram
Power supply circuit by the diode VD1, VD2, filter capacitor C1, C2, C6, C7, limiting resistor RI and the backup battery CB composition.
Input control circuit controls the function of S1, shift / manual control button S2, l bit / On button S3, drop bits on / off button S4, resistor R2 ~ R5 and timer integrated circuit IC (containing the input instruction detection , the clock oscillation frequency, counter, display drivers, controllers and other circuits) within the circuit.
Reset button reset circuit consists of S5, diodes VD3, resistor R14 and capacitor C3 form.
Display driver circuit consists of four LED displays (including VL1 ~ VL4), drive transistor VI ~ V4, the timer integrated circuit IC, and resistor R6 ~ R13, Ra ~ Rg and so on.
Control the implementation of the circuit by the transistor V5, relay K, the diode VD4, light-emitting diode VL5 and resistors R15, R16 form.
Clock oscillator circuit consists of quartz crystal oscillators BC and capacitors C4, C5 components.
After power, +5 V voltage for the LED display all the way through VD1 and VI ~ V4 provide operating voltage of the emitter; all the way through VD2 for the IC power supply, and charge by the RI of the OB; another way the implementation of the supply control circuit.
S1 is used to convert regular controller time setting mode, travel time status, and time setting status. The time set in state, S2 is used to convert bits or sub-conditioned spaces, S3 is used to increase the number of times, S4 used to reduce the number of times; set the regular time in the state, S2 conditioned spaces other than for the conversion or sub-bit , it can also switch to set a regular time is working; state in travel time, S2 is used to enter or exit the manual mode, S3 is used to open the set of all the power, S4 equipment used to turn off the power.
The three-time controller can be set to open three state-related work can also be set to two open two off (switch twice a day) or the opening and closing the work of the state.
When set to Beijing time, press the S5, the reset circuit is cleared, LED display shows "00:00." Press S1, the LED display of the hour-bit flash, and then adjust the DJ and 54-hour value; then S2, the flashing LED digital display of minutes, with the S3 and S4 adjust the minutes value.
The power to set the timing device boot time, press S1, the LED display lights on the VL1 and VL3, and then set the timer to the required method of Beijing boot time; set the timer off time, press S1, so that V "out (VL1 is still bright), and then set the timer to the required method of Beijing time off. If you need to set time three open three tests should be re-set the start time and two off the two time . the six regular time (3 time regular on-time and off time 3) After setting, click S1, when the state can go back.
When the timer start time to time, IC 12-pin output high, the Y5 conduction, ? pull its normally open contact to the load (power set of all) the work of the power-on, while V5 light; when Shutdown time to time, IC 12-pin goes low, so V5 deadline, ? release, the work load of the power is cut off ? the normally open contacts, VL5 also extinguished.
If you need to manually control, you should take the state by the time S2, V12 on the display when the LED lit, it indicates that the manual switch has been set into the state, this time by S3 after, V5 turn, K Pull, the work load power , VL5 light; then 54, V5 deadline, K release, load power, VL5 out. Since then click the S2, the LED display on the VL2 is off, when to go back to the state.
Component selection
R1 ~ R16 and Ra ~ Ra use 1 / 417 carbon film resistor or metal film resistors.
C1 and C6 use of electrolytic capacitors voltage is 10V; C2, C3 and C7 used monolithic capacitors or polyester capacitors; C4 use high-frequency ceramic capacitors; C5 fine selection of ceramic capacitors.
VD1, VD2 and VD4 are selected 1N400 1 or 1N4007 type silicon rectifier diodes; VD3 use 1N4148 silicon switching diodes.
VL5 use F5mm ordinary light emitting diodes.
LED displays use C6610A common anode type 4 dynamic clock display.
V1 ~ V4 are all made of 59,015 or 3CG9015 silicon PNP transistor; 1 / 5 or 58050,3 DG8050 use C8050 NPN silicon transistor.
Type of timer used LR6838 IC ASIC.
BC use 32.768kHz quartz crystal oscillator.
Use 5V DC relay K, the contact should be based on the load capacity of the power may be.

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A timing controller circuit diagram