Generally, we need a stopwatch to distinguish the time of two occasions. Therefore, in this tutorial, we are developing a simple digital stopwatch circuit, without utilizing any microcontroller. In this tutorial, we are likewise using a well-known IC CD4033.
However, this IC comes with a counter package and seven-segment decoding. It is exceptionally simple to interface with seven-segment displays. Although, this is a fully static counter-operational IC and ideal for low-power displays.
Meanwhile, this IC can be utilized for “counting seven-segment decimal displays, frequency division seven-segment decimal displays, timers, watches, clocks, counter/display drivers for meter applications.”
Hardware Components
The following components are required to make Digital Stopwatch Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | IC | CD4033 | 2 |
| 2. | IC | NE555 timer | 1 |
| 3. | 7 Segment Display | – | 2 |
| 4. | Resistor | 56k, 33k, 100K, 150 ohm | 1 |
| 5. | Capacitor | 10uF | 1 |
| 6. | Electronic switch | – | 1 |
| 7. | Push-button | – | 1 |
| 8. | Breadboard | – | 1 |
| 9. | Battery | 9 Volt | 1 |
| 10. | LED | – | 1 |
| 11. | Voltage Regulator | 7805 | 1 |
CD4033 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of CD4033
NE555 IC Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of NE555 IC
7805 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 7805
Digital Stopwatch Circuit
Circuit Operation
Subsequently, in this project, we are using components like resistors, capacitors, ICs, seven-segment display, on/off switch, push-button, breadboard, battery, LED, voltage regulator, and connecting wires.
We have likewise created a one-second delay by utilizing a 555 timer-based astable multivibrator in this stopwatch circuit. By utilizing some computation we can undoubtedly produce a one-second delay. Therefore, in an astable multivibrator, there are two resistors and one capacitor is liable for delay by charging or releasing the capacitor through resistors.
In this project, we have likewise chosen R1 33K, R2 56K, and C1 10uF. Henceforth, the counting equation for producing delay for an astable multivibrator is given below.
Hence, F=1/T= 1.44/(R1 + 2R2) C1
Applications and Uses
Generally, a stopwatch is used to quantify the measure of time that passes between its enactment and deactivation.
