This project implements a composite USB device supporting two USB 2. 0 full-speed gameport HID interfaces. The physical joystick ports are wired in accordance to the `Atari standard` allowing connection of most Commodore 64 and Amiga joysticks as well as older Atari 2600 compatible joysticks. The USB adaptor is built around a PIC18F2550 microcontro
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ller and a port of the Microchip USB stack (to the Hi-Tech C18 PRO compiler). The circuit is designed for minimum component count to allow it to easily be built either on a PCB design (included below) or a small piece of stripboard. The 2 physical joystick ports are multiplexed onto the PIC`s PORTB, this is to allow use of the PORTB weak pull-up feature on both joysticks (removing the need for 10 pull-up resistors). An optional barrier diode is also included to protect the host computer from power feedback when using an in-circuit programmer. Multiplexing to a single port has the added advantage of leaving PORTA free for future addition of mouse/paddle interfaces (at some point I would like to add an Amiga mouse port to the design). The whole interface consists of 3 ports (2xJoystick, 1xUSB) and 10 components including the PIC. To make it even more compact/cheap you could also remove the status LED (which I included to help debugging) and the MCLR pull-up resistor (required so the ICSP programmer can hold the device in reset - useful when developing). Most of the complexity is in the software, feel free to download it and adapt it to your purposes. Please note that I don`t have my own USB VID or PID (since it costs $1500!) so you may need to alter the VID and PID in the code if it conflicts with another device (very unlikely since I used the Microchip VID). The software includes full switch debouncing for both on and off...
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.....
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