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Help with RC lights

Old 08-14-2011, 01:51 AM
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phmaximus
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Default Help with RC lights

Hey guys, ive fitted the RPM bumper light, roof light & rear light pods on my slash. Im planing to have them switchable with the traxxas 4ch link TX, & use the 4th chanel for the bumperlights/tail lights and have the 5ch for the roof lights.

using 2 RC Switch with Small Low-Side MOSFET
from robot market place

Can someone please check my dodgy microsoft paint wiring diagram... PLEASE....




The reson i like these switches is there price $7.95, shure there are ready to go ones on ebay for around $20 but i need 2 and thats like $40.. no way


The RC switch with small low-side MOSFET can be used with standard hobby radio control systems for radio control switch applications or simple interface applications. Example applications include converting extra RC receiver or servo controller outputs to simple high/low signals that can control LEDs or bigger MOSFETs or relays and connecting RC systems to microcontroller projects that do not have the necessary resources for decoding the RC interface. Two outputs indicate the presence of a valid signal and whether the switch is on or off, and an integrated low-side MOSFET turns on when the switch is on, allowing the board to drive small loads directly. The switch also features a flyback (or freewheeling) diode across the drive outputs so that you can connect a coil to them, such as a motor or relay, without any additional external components.

Connections
The lower-left side of the PCB (as shown to the right) contains three pins that can connect directly to an RC receiver or servo controller, and the four pins on the lower right side of the PCB are the board's power supply connections and digital outputs. These outputs will be at the same levels as the VCC power connection, which can range from 2.0V to 5.5V. VCC is also the gate voltage that is used to turn the MOSFET on, so it should be noted that lower VCC voltages will lead to higher MOSFET on resistances (which in turn limits the maximum current the device can switch). The RC signal input pin, RC IN, can handle voltages from 0 to 7V, and the threshold for a logic high is approximately 1V.

The load power supply and the load itself can be connected via the pins near the top of the board, with the positive side of the load on the left and the negative side of the load on the right. The negative load supply should connect to the ground pad on the top-right side of the board, and the negative side of the load itself should connect to the pin labeled "MOSFET output". The two pins labeled "Load supply" are internally connected and intended to give you convenient connection points for both your load and your load power supply. There is a flyback (also known as a "freewheeling") diode between the MOSFET output and load supply, which allows you to safely connect an inductive load such as a motor or relay. The MOSFET can deliver up to 3A with VCC at 5V; the performance will be worse if the input voltage is lower or if the MOSFET isn't kept cool. The MOSFET can tolerate voltages as high as 30V, but the flyback diode is only rated for 20V, so an external diode should be used for load voltages that can exceed 20V. If an external diode is used, the load supply pins should not be used; these connections should be made off of the board.

The VCC pin can be connected to the RC supply, VRC, by shorting across the pads on the back side of the PCB marked by the red box in the picture to the right, allowing either the RC receiver to power the digital device or allowing the digital system to power the RC receiver. If the connection between the two power pins is not made, VRC can be left disconnected since it is not used by the RC switch board.

The VCC pin can also be connected to the load supply by shorting across the pads on the back side of the PCB marked by the yellow box in the picture to the right, allowing either the load supply to power the digital device or allowing the digital system to power the load.

Outputs and Indicator LED
The board has two digital outputs, each of which is capable of sourcing or sinking 20 mA. The primary output, OUT, goes high (on) when a valid signal is detected and the pulse width is above the threshold of 1.6 ms. There is approximately ±0.1 ms of hysteresis on the threshold, meaning that the pulse width will have to get to approximately 1.7 ms before the output turns on, and once on, the signal will have to fall below 1.5 ms to turn off. A secondary digital output, GOOD, indicates the presence of a valid RC signal (10-100 Hz pulse rate, 0.5-2.5 ms pulse width).

An LED on the RC switch indicates the status of the RC signal (and outputs). When a valid RC signal is not detected (GOOD and OUT both low), the LED flashes with a duty cycle of approximately 50% (i.e. the LED is on for as long as it is off). When a valid signal is detected but the pulse width is below the threshold (GOOD high and OUT low), the LED flashes at a very low duty cycle (i.e. very short flashes). When a good signal is detected and the pulse width is above the threshold, both outputs are high, the LED turns on (no flashing), and the MOSFET is on.

Specs
Maximum Operating Voltage 30V
Maximum Output Current 3A
Minimum Logic Voltage 2V
Maximum Logic Voltage 5.5V
Size 0.4 x 0.6 in.
Weight 0.5g

The Main reson ive gone over kill with the BEC is because ive ordered a BMS-616DMG+HS Servo and plan to run it on 6v so its as fast as it can get and was worried that the ESC BEC is only 1.2amps and it would struggle with that sevor & then with 12 lights ontop of that

oh and the LM7805 is because the RC Switch can only handle 5.5v max on the VCC (Board power)




BMS-616DMG+HS Super Strong Digital Servo for bugggy (Metal Gear)10.2kg / .12sec / 46.5g

Double ball bearing (Si-oil)
CE Certified Strong 3 Pole Motor
Heavy duty sealed water proof case
Alloy heatsink
Digital signal design with 100% fitting square PWS
Automatic measures central ms
ALU 6061 alloy and C95 gear material
Digital IC (SOP package with 12bits transfer data)
MOS-FET driver (spirited driver able to push over 7A power)


Weight: 46.5g / 1.66oz
Dimensions: 40.5 x 20 x 38.5mm / 1.60" x 0.78" x 1.54"
Torque At 6.0V: 10.2kg/cm , 136 oz/in
Speed At 6.0V: 0.12 sec / 60° at no load
Operating voltage: 4.8 - 6.0V
Old 08-14-2011, 07:45 PM
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phmaximus
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Default RE: Help with RC lights

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