Tips to ensure the right rc cars performance

Try to follow steps that will lead to proper rc model functioning. Avoid causing damage to facilities or may lead to rc cars communication failures.

Cables and connectors

The rc cars cables usually used in DMX are twisted pair, because they offer greater immunity to noise. As mentioned before, both threads receive the same amount of noise, and allow differential amplifiers eliminate to stay with valid information. The XLR connectors are standard, of which there are two models: with 3 or 5 pins. Formerly much used the 3, but now are more common 5-pin. The configuration of the pin 1 to 3 in a 3-pin cable is the same as the pins 1 to 3 in a 5-pin cable. While it is true that in the rc industry the XLR cable is the standard cable in some applications for practical and aesthetic, it is very common to use Cat5e UTP cables.

The framing device is never connected to pin 1, the reference signal, since this could cause a mass ring and affect the proper functioning of the system. Without going to the theme of the phenomena caused by an erroneous ground, the defensive based data transmission cable, it is important to note that a possible grounding conductor must be performed at a single point of the whole system. This procedure is usually performed only in fixed rc cars installations.

However, it is good practice to have teams in DMX input to eliminate the possibility of electrical contact between the DMX bus and circuitry of the device. Most professional teams have isolated items.

As the bus travels DMX 512 channels of information, each device must be configured to "listen" to those who need it. When a device requires the use of multiple channels, usually set only the direction of the first, being reserved for that device all you need from the first.

Build an rc cars receiver

The receptor presented is purely experimental, and only serves to try to interpret the DMX512 protocol and display on its display the value of the currently selected channel. The design should be appealing. The circuit consists of a PIC, as the heart, a ULN2803 Darlington transistor arrangement for the lamps of seven segments and a bus driver for DMX MAX485.We used a PIC18F2550, but the software may be compiled for a much smaller because it requires very little memory of the program. The PIC stores in RAM the values of all 512 DMX rc cars channels, allowing you to "absorb" the complete frame information. DMX channel is selected via the keypad matrix.