Wireless remote control system for tower crane based on MSP430 and nRF905 (2)

system The signal transmitting circuit including keyboard, CPU and data transmission parts, hardware, such as shown in Figure 2
. Control tower crane (upper, lower, left, right, before and after, low-speed, medium-speed, high-speed, stop and so on) through the keyboard input circuit to the corresponding control signal into the microcontroller MSP430F135 port I/O, after the signal processing chip through its SP I output to the wireless chip nRF905 SCM, the system normal work, at the same time on the RF chip set of parameters to determine the operating mode, operating frequency, transmission rate, output signal is processed into wireless chip, wireless transmitting part is sent to the receiver.
MSP430 MCU is a mixed signal controller of an ultra low power produced by TI. These microcontrollers be battery operated, and can have a very long time, the device can be quickly wake up from a low power mode in less than 6 μ s time. MSP430 chip also integrates A /D converter, hardware multiplier, timer, comparator module.