Thank you in advance, This is my first project and am struggling with it. When I started, I knew absolutely nothing...But I have learned a bit since then.
First: Here was the goal of my project:
I wanted a 2 digit up down counter housed in a round case. I wanted to control the up and down count with a ring on the outside of the device that spins. This seems pretty hard to do, and if it becomes too much of a problem, I would like to have a wheel partially extruding from the side of the device that essentially works the same way. Spinning clockwise count up, counter clockwise counts down. I also want the device to be able to preset to a number I choose...with a reset button to reset back to that number. This device must be battery powered. Here is a quick design of my project:
Here is the schematic I have chosen:
These are taken from http://members.shaw.ca/roma/up-down.html
These are the parts I am going to order so far:
2x Single Hi-Red 2.3" CC 7-Segment LED Display $3.90
200x 330 Ohm, 1/4 Watt Resistor $3.00
200x 10K Ohm, 1/4 Watt Resistor $3.00
200x 1K Ohm, 1/4 Watt Resistor $3.00
2x NTE NTE4510BT IC-CMOS UP/DWN COUNTER $2.54
2x NTE NTE4511BT IC-CMOS,LATCH DECODER $1.96
4x Solder IC Socket, 16 Pin $0.28
5x .1 uF mono radial capacitor $0.75
4x 2N2222 Transistor $1.16
And here are my questions:
1.) How would I modify this schematic to to use the spinning wheel to count up and down? I have been told the easiest way would be with an octocoupler and a shmitt trigger..but I have no idea how to incorporate that, or what it is. I though I could just hook up a rotary switch.
2.) Is this circuit battery powered? If it isn't how would I make it battery powered?
3.) Have I chosen the correct parts so far? What else will I need?
Thank you again...I am about to start ordering parts, but I wanna make sure everything is right first.
First: Here was the goal of my project:
I wanted a 2 digit up down counter housed in a round case. I wanted to control the up and down count with a ring on the outside of the device that spins. This seems pretty hard to do, and if it becomes too much of a problem, I would like to have a wheel partially extruding from the side of the device that essentially works the same way. Spinning clockwise count up, counter clockwise counts down. I also want the device to be able to preset to a number I choose...with a reset button to reset back to that number. This device must be battery powered. Here is a quick design of my project:
Here is the schematic I have chosen:
These are taken from http://members.shaw.ca/roma/up-down.html
These are the parts I am going to order so far:
2x Single Hi-Red 2.3" CC 7-Segment LED Display $3.90
200x 330 Ohm, 1/4 Watt Resistor $3.00
200x 10K Ohm, 1/4 Watt Resistor $3.00
200x 1K Ohm, 1/4 Watt Resistor $3.00
2x NTE NTE4510BT IC-CMOS UP/DWN COUNTER $2.54
2x NTE NTE4511BT IC-CMOS,LATCH DECODER $1.96
4x Solder IC Socket, 16 Pin $0.28
5x .1 uF mono radial capacitor $0.75
4x 2N2222 Transistor $1.16
And here are my questions:
1.) How would I modify this schematic to to use the spinning wheel to count up and down? I have been told the easiest way would be with an octocoupler and a shmitt trigger..but I have no idea how to incorporate that, or what it is. I though I could just hook up a rotary switch.
2.) Is this circuit battery powered? If it isn't how would I make it battery powered?
3.) Have I chosen the correct parts so far? What else will I need?
Thank you again...I am about to start ordering parts, but I wanna make sure everything is right first.
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