delabs Circuits

Showing posts with label Timers-Counters. Show all posts
Showing posts with label Timers-Counters. Show all posts

Wednesday, November 16, 2016

Decade Digital Counter Module - LED and LCD

I'm looking for a source of decade counters and wonder if you can help? I don't want to build the counter, I want to buy a functioning counter module.

Do you have source suggestions?

Mail from SF USA On 1/1/2011 1:34 AM

Try These, some are kits, some ready modules.

delabs has a resource on counters -   Digital Timers Counters and Clocks

Easy way to build a counter since the 80s is using ICM7217.


4-Digit, Presettable, LED Up/Down Counter

4 Digit Counter Module - The counter module is supplied pre-assembled and tested and provides the building block for counter and timer circuits. 

The counter module may also be used as an accurate digital timer with the addition of a suitable timebase and gating circuit.

4017B Decade counter (5-stage Johnson counter) - Learn about the 4017 by building the DOCTRONICS Light Chaser Project:

Multifunction Counter-Timer Electronic Kit K8035 - Counter-timer K8035 is a multifunction electronic kit that is handy for all sorts of counting and timing applications. Counts up or down from your own pre-defined starting point. Counter-timer can count each time you press the onboard push buttons, or count externally supplied voltage pulses.

VM147 - Panel Counter MODULE - offers a very practical solution for counting parts, people, scorekeeping, etc.

LCD counter module 7016 6-digit - Snap-fit module with 4-digit LCD and its own power supply (not included). This counter module is therefore suited to PCB-mounting (snap-in frame can be removed) as well as front-panel mounting

Try Radio Shack ask for - LCD Counter Module - it may be expensive compared to above.
delabs

Friday, February 13, 2015

Some Cyclic Timer Ideas

A product spec and need from my email archive. This indicates how clarity in customer specs can help him get a working solution with less wastage of time and money.

Electronic design assistance

I am seeking assistance from someone that would assist me in designing a custom circuit for a prototype that I am working on. I would be willing to work out a mutually lucrative contract with someone who wanted to get involved with this project.

General Circuit description


Cyclic Timer

Circuit components:

  • Tank filled with liquid.
  • Fluid hose to pump
  • Fault switch or Low level float consisting of a magnetic float encased around a tube with a no/nc reed switch.
  • Liquid 12vdc @ 5a pump
  • Trigger momentary switch to activate cycle.
  • Reset Switch.

Circuit requirements

When momentary switch(3) closes for 2 seconds, pump(2) will activate (ON) for an adjustable time from 2-3 seconds. After pump(2) has activated an adjustable timed 10-60 minute countdown of the pump (off) will begin. Any additional signals from momentary switch(3)will not interrupt this cycle. If when cycle is complete a switch closure from momentary switch(3) still exists the cycle will repeat. If at any time circuit receives a signal (NC/NO) from fault switch(1-B) cycle will be immediately shut down and not restart until manual reset switch(4) is pressed.

Notes: 3. Momentary switch to activate cycle could be in the form at current of an ultrasonic movement detector as seen here.

I have not tested this switch yet to insure that it will perform the necessary detection capabilities, so this may change if a more suitable device is located.

Notes:4 The reason for the manual reset button or circuit is that the float switch is very sensitive. The potential exists that when liquid level is low and pump activates, the amount of fluid that the pump draws to prime itself, may momentarily fool the float switch into thinking that tank has become empty. When pump shuts down and pump looses it's prime a small amount of fluid will back flow from pump back into tank causing the level to fool the fault switch into thinking it has an acceptable level. I want to avoid a toggling effect that may be created when level gets into this level of liquid.

General Notes: I have found several cyclic timers that could possibly perform the above list of requirements.

Mail from RS

Standard Solution

Similar thing here two-stage-sequential-timer at  delabs Service Project Circuits

delabs

Thursday, September 18, 2014

Up-Down counter-timer

(A question answer thread of delabs.net, nearly a decade old)

Presettable Up-Down counter-timer-Question   

I am looking for a schematic for a pre settable Up/Down counter that I can build for my church. It needs to be 5 decades. From 0:00:00 to 9:59:59. I ran across your web pages while searching for such a schematic. Can you help me out?

EE



Presettable Up-Down counter-timer-Answer

It appears from the "9:59:59 " you have mentioned, what you need is a timer.It it a count up and count down timer you need, like a clock ?

Can you explain to me how you plan to use this circuit in the church.Visit the links below and see if that is what you want.

delabs


Presettable Up-Down counter-timer-Reply 

Thanks for the links. What I need this count down timer for is to allow speakers at the church to know how much time is remaining of their presentation. All of our speakers are taped for later use or review. The speakers giving the presentation usually go over their time limits for the audio tapes. With this unit I am trying to build time can be entered by preset thumbwheel switches. The counter is then started and times out when the counter reaches 0:00:00.

What makes this count down timer different is there will be two seperate displays. A one inch set of seven segment LED's will be in the main console with the rest of the logic. There will also be a 2.5 inch set of seven segment displays remotely connected (anout 3 feet away). The large displays will be what the speakers will see. The small displays will be in the control booth.

I already have the following items gathered up. I am hoping to use these components if I am able. I have the MC14029, the MC14513, the Allegro UDN2597A (to drive the large LED's), the Dallas Semi DS32KHz time base, the MC14020, the MC14013, the large and small LED displays, and the thumbwheel switches (set to 9:59:59 maximum)

I also have some MC14011, MC14490 (Hex Debounce Switch Controller, MC14049, and the R's and C's necessary to complete the circuit.

Does this explain what I am trying to do? I think the MC14029 counters can be used to do all the counting and store the preset values. All I have to do is add the reset at 6 for the tens of seconds and the tens of minutes. However, I don't know how to connect the logic?

The DS32KHz, MC14020 and MC14013 will generate the 1 Hertz (1PPS) signal. That is about all I currently have. That is why I need some help

EE


Presettable Up-Down counter-timer-Answer

below are two circuits in pdf format see if they are ok see... Digital Circuits-2

Circuit 1 - Digital Timer Clock With Preset using Thumbwheel switch.


Circuit 2 - 1 Hz or 1 pps crystal clock using CD4060 and 32768 Hz Crystal.


They have not been tested much... The 4513 control pins 8-4-5-3 connections verify, as i did not get the datasheet.

the circuits will work as concepts are right, but some tweaks in R C values may be required.
the R C values can only be corrected if you have problem in making it work.

the main problem in the R C values may be related to "the reset at 6 for the tens of seconds and the tens of minutes". tell me what changes you may want. this is a presettable count down timer upto 99.59.59 hours.minutes.seconds

delabs