On the DMX line side a XLR connector should be used. Either a 5 or 3 pin connector. The pins/holes in a XLR connector are usually numbered so no need for a picture. For the 5 pin connector, only pins 1-3 are used. I used the following code to do some initial tests on the cirquit: dmx_tx_test. zip (Microsoft VC7 project). The code configures the device as a DMX transmitter and repetedly
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sends out DMX frames until a key is pressed. By setting all channels to either 0 or 255 it was easy to verify that the cirquit was transmitting DMX data using an ordinary voltmeter. The cirquit is not fully USB compliant. The USB spec says that a USB bus powered device must not draw more than 500 uA in USB Suspend mode. FT232RL (IC2) will correctly go into low power mode but MAX481 (IC1) will not. To set MAX481 in low power mode, pins RE and DE on MAX481 must be set to RE="1", DE="0". FT232RL provides both PWREN and SLEEP signals so USB Suspend mode could be handled with some additional gates. However, all sorts of crazy equipment (which definitely don`t comply with the USB spec) these days use the USB port as power source, so I don`t consider the USB Suspend mode violation too serious. But, here is room for improvements. There are some ready made (commercial) USB-DMX interfaces also using FTDI chips. While designing the cirquit I tried to make it comaptible with the Enttec Open DMX USB, which uses the older FTDI chip FT232BM. Practical tests shows that my cirquit is compatible with software supporting Enttec Open DMX USB, for example FreeStyler. When working with high power equipment like dimmers, be sure you know what you are doing! You are connecting your PC through the USB port to eqipment that switches kilowatts of power at several hundred volts. The above cirquit does not isolate the USB port from the DMX line. If...
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....
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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....
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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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