Depending on what days the motor needs to be switched ON, only those relevant diodes are connected with the 4017 outputs, rest of the diodes are kept unconnected. This stage is integrated with the IC 4017 stage through the seven 1N4148 diodes. The IC 4060 at the right side is configured as short duration timer for activating the motor which may be connected with the shown relay contacts.
The IC 4017 output functions as a week timer where its 7 outputs shift (become high) from pin 3 to pin 6 sequentially in response to the above 24 hour pulses, depicting the 7 days of the week. With every pulse after the preset 24 hours interval, the IC 4060 also resets itself via the diode connected across its pin 3 and pin 12. This results in a short pulse to pin 14 of the IC 4017 which is configured as a 7 stage counter divider here. The 22uF capacitor must be non-polar low leakage type of capacitor and the resistors should be MFR 1%.The output is received from pin 3 of U3, which goes high as soon as the set time elapses. A suitable fixed value may be selected for these two components for getting the specified time delay.
The time length is determined by the 22uF capacitor and the 10MΩ potentiometer. In addition, the 74LV4060D IC is a low-voltage Si-gate CMOS device that has a 14-stage ripple-carry counter/divider and oscillator with three oscillator terminals optimized for low voltage applications.Īs shown in the above week day programmable timer circuit, the IC 4060 ais wired up as a 24 hour timer circuit. The 74HC4017D IC is a 5‑stage Johnson decade counter with 10 decoded outputs that has a wide voltage range and with ESD protection. It uses 74HC4017D and 74LV4060D ICs in driving the motor at predetermined time and on preferred days. This project is a timer circuit that is used for actuating the motor throughout the week as desired by the user.
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