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  1. Sadlercomfort

    Mechanical Counter - Debounce

    The metal strip is approximately 40mm and the butterfly contact is approximately 20mm. It just under a second, from the initial contact to its rest point. During this time the contact is bouncing.
  2. Sadlercomfort

    Mechanical Counter - Debounce

    Hello, I am currently using a mechanical counter which counts every time the circuit is made (See attached Type AW 15.01). The circuit is made as a mechanical arm slides a butterfly metal contact on a matching metal strip. One end of the counter is essentially connected to GND and the other...
  3. Sadlercomfort

    Astable 555 Circuit Problem

    Try changing your 4.7M ohm resistor to 4.7k. Your cycle period seems to me over 300 seconds long, which is why your hearing a continuous beep. Changing the capacitor had the biggest effect on the time period.. If you just changed your capacitor to 220 micro farads, your buzzer will beep every 1...
  4. Sadlercomfort

    Creating a latch circuit with logic gates

    I have to use circuitwizard sadly, but I've learnt alot of the experience and feel quite close to completing my assignment. Just need to get the bugs out. How do I make the JK's Q output, positve edge triggered rather than negative?
  5. Sadlercomfort

    Creating a latch circuit with logic gates

    No it's an assignment, although It is a fun challenge. Otherwise I would of used a PIC microcontroller interfaced with a keypad and programmed it with assembly. Unfortunately its much more complicated than that.
  6. Sadlercomfort

    Creating a latch circuit with logic gates

    Oh yeah, I don't know how to fix the JK flip flop wiring. The JK's automatically reset when 3 unsuccessful combinations have been entered OR when the a correct combination has been entered. Using the transistor to make the JK's low. The problem is the output resets aswell, so I need to find a...
  7. Sadlercomfort

    Creating a latch circuit with logic gates

    I'm not sure if I understand you fully. But then I'm not that familiar with JK's or D-type Flip Flops. I didn't realise the flaw in the design, where different arrangements of the same combination would work. 1122999 for example. The circuitwizard software I'm supposed to use doesn't include...
  8. Sadlercomfort

    Creating a latch circuit with logic gates

    Yeah, I was wondering that.. If the button is pressed to long it sets the second Q output on the FF to High. A single pulse would be great. Reducing the clock frequency only increases the amount of time you need to hold the push-to-make switch before the data clocks through
  9. Sadlercomfort

    Creating a latch circuit with logic gates

    I totally understand, I'm familiar with that arrangement. I've set it up but with 5v at the base, and it clears the flip flops nicely. However it doesn't work using the final output from the IDs, because of a slight voltage drop. I found some sort of Schmitt Trigger Inverter which seems to...
  10. Sadlercomfort

    Creating a latch circuit with logic gates

    Yeah, that's actually what I'd like to do. The Clear pins on all the flipflops are connected together, and kept high as the inputs are being entered. Then when the output is received successfully, it operates a push-to-break switch and sets the Clear pins low to reset. However, I can only do...
  11. Sadlercomfort

    Creating a latch circuit with logic gates

    Not sure how to reset them all.
  12. Sadlercomfort

    Creating a latch circuit with logic gates

    Hi guys, I managed to create something, It works a treat but is complicated. The inputs a clocked through at 10Hz, just enough time to capture the input once. I've used AND Gates and Inverter's so the output is switched when the correct combination is pressed. I used an enter button, so when...
  13. Sadlercomfort

    Creating a latch circuit with logic gates

    Hi guys, I'm trying to create a circuit which takes 9 push-to-make switches, and switches a single output to high when you type in a specific combination. I've been experimenting with latch circuits using two NOR gates but am getting no where. I know that i can use AND Gates, which will set...
  14. Sadlercomfort

    Looking for a suitable transmitter

    That's interesting lol, I'm using alot of different data. I think light would be a good way to go for this (Y)
  15. Sadlercomfort

    Looking for a suitable transmitter

    I've done a little but more research and it should be possible to use sound as a transmitter, produced by a transducer. However the power consumption and the size of this could be impractical. I love the idea of light! Its the only electromagnetic wave capable of travelling through water...
  16. Sadlercomfort

    Looking for a suitable transmitter

    Hi Guys, I would like to find a transmitter capable of transmitting data up to a range of 10-25 meters. The transmitter should be capable of transmitting underwater, fully-submerged at a depth of 1 meter. Now here's my problem. The transmitter needs to be small enough to fit inside a thick...
  17. Sadlercomfort

    Microcontroller, Stepper Motors and a 4-Axis Drilling Machine

    Thanks alot! You are right, the accuracy of these stepper motors should be sufficient to determine the position if set-up correctly. I have started alot of work on this already. I have some good assembly code which I can manipulate to create a keypad control for 4 stepper motors.
  18. Sadlercomfort

    Microcontroller, Stepper Motors and a 4-Axis Drilling Machine

    Thanks, I'm not using Linux. I'm using assembly language written and compiled by MPLAB. This assignment is entirely theoretical based and I don't have to build any prototypes. All I can find are infra-red ultrasonic sensors.
  19. Sadlercomfort

    Hot Air Station - Finally arrived!

    Have ordered a pair Bob =D
  20. Sadlercomfort

    Microcontroller, Stepper Motors and a 4-Axis Drilling Machine

    Hi Guys, I have been given an assignment where I need to design a 4-axis drilling machine, with 4 stepper motors and a PIC micro-controller. The X, Y axis will be controlled using a lead-screw, moving the work table. The Z-axis will also be controlled with a lead-screw, but moves the drill head...
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