This timer project has been designed as an introduction to the use of the NE555 monostable and resistor-capacitor timing circuits.
Students start by investigating the need for an accurate timer and are then led through the complete design process
Upon completion of manufacture, students evaluate their work and start to look into commercial product development
The information and activity sheets guide the students through a series of exercises, including the use of Crocodile Clips software, to build up knowledge in the use of the NE555 monostable within circuits
They include both detailed student and teacher notes, which contain suggested lesson plans, mapping to the National Curriculum and a series of structured homework assignments to support the work in class
The component kits are supplied in multiples of five and include: NE555 and IC holder, resistors and capacitors, buzzers and LEDs, switches and potentiometer and battery clips
Pre-drilled PCBs are available separately in packs of 5, order code 70-0060
Suitable for Key Stage 3 (ages 11 to 14)
Each kit requires 1x PP3 battery (not included).
Project notes are available to download here, and are designed to be photocopied for class use
Q. Hi,
if I wanted to have no delay and a contact for just an instant, how would I have to adept the values of the resistors and the capacitors? Also, I don't need the buzzer and the diode, can I just leave them out?
Just for you to understand these questions: I need to set up a push button so that if it is pushed, it can only trigger a contact for an instant only (one shot) without delay or repeat, regardless of how long the push button keeps being pressed.
I intend to order the kit pack and await your response
Best regards,
Hein
A. Hi Hein, thank you for your question. The project notes can be found here. The data sheet for the 555 timer may also be of use.
