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34 Threads found on edaboard.com: Electronic Timer
Hello Everyone !! I want to make an electronic circuit for a project which could be work like below... "we often forget to switch off the light of washroom after come out from it.." when a person will enter in washroom and close the door the light will be ON automatically and when same person come out from washroom the light will be OFF a
I start build water rocket. For that i need parachute and electronic for release them (like this ). I want build similar on the ne555 but im beginner. I want regulate time for servo start with potentiometer. Someone can help me?
PID500 doesn't seem to provide the intended temperature programming function, only basic temperature ramp. You can either use a profile temperature controller like PR502 or add a separate electronic timer that shuts down the heater after 20 minutes.
if you know a little electronic, you can build timer with 555 easily. just search 555 timer
Hello, Some of the basic electronic circuits, mainly consisting of 555 timer & CD4017 and also other ICs have a range of input voltages such as the circuit could function from 6V to 9V for example. How could this be justified and explained?
you can use c2051. Refer its data sheet. what is a c2051 ? I have'nt heard of this one yet. Thanks! I would consider myself a novice. Would you mind me inquiring as to which particular microcontroller would be best? The usual choices are Atmel AVR or Microchip PIC contro
Hi, I'm am attempting to make a 10 second countdown timer circuit using a 7-Segment Dual Digit Display. I would, ideally, like it to countdown from 10 to 0; wait for about another 10 seconds and then restart. Do you have any idea as to which chip(s) I should use? I would gladly appreciate a circuit diagram as well, if possible. Thanks!
Hi, I'm am attempting to make a 10 second countdown timer circuit using a 7-Segment Dual Digit Display. I would, ideally, like it to countdown from 10 to 0; wait for about another 10 seconds and then restart. Do you have any idea as to which chip(s) I should use? I would gladly appreciate a circuit diagram as well, if possible. Thanks!
if it is not a electronic device then you have to use the gear ratio
Hi to all, i need small electronic interval trigger. This trigger should trigger 20 to 30 times in a second. I need this to trigger some relay. Such device should be very small and it should work on 9V. How can I do that? Or, it would be better if there is some kit? please help
What you need to do is to write an algorithm or a "program" listing all the steps required to accomplish your task. Right from switching the gadget on to switching it off. Once you done this then you can decide what electronic blocks you need to build, then come back here. Frank
Since you're not an electronic genius like the rest of us on this board :grin:, I would suggest you look at getting two off-the-shelf timers-some kind of hobby kit or something. Set one timer to turn on to open the door, and another to turn on to close the door. The "open" timer would fire a time-delay relay that would (...)
Hi friends... How the electronic rice cooker automatically turns off when the cooking process is completed? Thanks to all.....
You need to modify the schematics as in the following examples: Clap switch using timer 555 ? Human ? Sensors/Detectors ? Free electronic Circuits diagrams Schematics Projects ::
The constraints you place on the project, i.e., no analog, no microcontroller, severely limit what you will be able to do. From a medical standpoint, most things begin as analog, such a blood pressure, blood glucose, temperature, etc. The lack of a microcontroller will limit the amount of logic/timing yo can do. You might want to consider some
Microchip PIC, ASM Delay Code, Code Generator Welcome to To-Pic Mark Crosbie's Hom
Thanks, now we know your plans First game to my mind this......................................... Build the "7-uP" Alarm/Time-Switch ...with 7-day 4-event alarm schedule, versatile alarm options, alarm logic output, 4-channel time-switch with 7-day on/off schedule, USB link to PC for setting up and programming, and a host of other
Watch dog timer is usually inbuilt timer( but there are external WDT also) , whose main work is to monitor the system operation.. A watchdog timer (WDT) is a device or electronic card that performs a specific operation after a certain period of time if something goes wrong with an electronic system and the (...)
Could someone please explain this circuit? Why is there a 4.7M in parallel to 100nF? Also, how does the frequency diminish? Why are pins 7 and 6 shorted? ROULETTE Circuit
I have an intresting project i wanted to build and i bit off a bit more than i can chew. the basic idea would be a couple of 555 timer hooked up like in a diagram i got out of make magazine volume 10( i will include the diagram) to make a buzzer go off after a 5 second delay. what im having trouble with is the math for what resitors and capcitors.