This page is for info on converting the low resolution optical encoders, typically found in serial mice, into high resolution encoders needed for DSC`s (Digital Setting Circles), for your telescope, etc. The serial mouse encoders I found had the dpi stamped right in the side of the slotted disk 1, in my case 200 was stamped in the side.
Click here to download the full size of the above Circuit.
The mouse must be a serial type (like a logitech 3 button mouse), the type that plugs into the serial port. Do not use the common 2 mouse that plugs into the mouse port, they use continuous turn pots, not optical encoders. The serial mice have a serial interface for the optical encoders already and there isn`t any reason why you couldn`t reuse that portion of the circuit board as well if you needed to interface directly to your computer`s serial port. In my case I discarded that portion when I dissected mine with a jewelers saw as I didn`t need it. The program you use should somewhere ask for the resolution of the encoders and you can calculate an initial setting based on the dpi times the circumference of your bearing surface, if you attach the encoders like I did. Once you have them working, you test it by rotating the axis through a known number of degrees, preferably a full 360 and watch the readout on your program or digital setting circles to make sure it tracks properly. If there is a difference, simply adjust your final resolution to compensate and then retest. In case the dpi isn`t stamped in the side simply count the number of slots in the disk and multiply by four, then take a micrometer and measure the diameter of the little drive wheel on the encoder shaft and divide the previous calculation by (pi times the dia in inches) and it should give you the dpi. The result should come very close to a standard dpi. If I...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: