434 / 315 MHz 8 Channel Secure Remote Control

Transcription

1 434 / 315 MHz 8 Channel Secure Remote Control Figure 1: 434 / 315 MHz 8 Channel Secure Remote Control Introduction 434MHz 8 Channel Secure Remote Control gives out 8 TTL / CMOS level logic outputs. Four outputs can be used to control direction of the robot and remaining 4 can be used for other actions, velocity control etc. Switches are arranged in format for user friendly control with left and right hand. Remote has range up to 100 feets in outdoor environment. Each remote control has 10 security bits settings which can be used for pairing of one transmitter and reciver. Because of the security bit settings command from one transmitter will not accidentally trigger reciver of the other robot. On the reciver output is buffered using IC 74HC245 and command output is also displayed on the LEDs. This remote is based on 434 MHz ASK Transceiver Module and HT640 and HT648 encoder and decoders which can be used for transmitting 8 commands with 10bit security address setting. You can transmit multiple commands at the same time by simultaneously pressing multiple keys. Which also means you can use few keys as shift key and probably control up to 255 devices. Outputs are non latched types. I.E. outputs will remain logic 1 till the remote transmitter s key is pressed. Transmitter and reciver both are reverse polarity protected. Both of them have low drop voltage regulator. Transmitter has power switch. Transmitter and receiver can be powered by 9V battery or 7 to 12V supply. Remote control has onboard PCB antenna and terminal for connecting the wire antenna. PCB is made up of high quality glass epoxy material with the double sided through hole layout for giving additional strength to the switches and connectors. Robot can also be controlled by PC by soldering DB25 male printer port connector at the bottom side of the PC and connecting it with the PC. This feature is not yet tested. NEX Robotics Pvt. Ltd. 1

2 Note: You have to solder pad to select track antenna or a wire antenna before use as described in the product manual before using remote control. For perfect remote control operation make sure that two 0.1uF capacitors are connected to the motor terminals with respect to motor body and robot chassis and motor body is grounded. Make sure that robot has adequate power available (at least twice of the stall current of all the motors combined) to avoid interference caused due to power surges in the supply. Specifications: Transmitter and Reciver module: 434 MHz ASK Transceiver Module Transmitter: Frequency: 434 / 315MHz Power: 7V to 12V DC, 9V battery can also be used. Number of control inputs: 8 (arranged in 4+4 user friendly configuration for left and right hand) Antenna: User selectable PCB track antenna or quarter wavelength wire antenna Encoder: HT640 (8 command output and 10 bit security address) Reverse polarity protection Onboard low drop voltage regulator Power switch and Power indicator LED Size: 12.5cm x 5cm Receiver: Frequency: 434 / 315MHz Power: 7V to 12V DC, 9V battery can also be used. Outputs: 8, 5V, TTL / CMOS level, Buffered with IC 74HC245 8 LEDs displaying status of the commands (can be disabled by removing jumper) Antenna: User selectable PCB track antenna or quarter wavelength wire antenna Decoder: HT648 (8 command output and 10 bit security address) Valid data confirmation output for customization Reverse polarity protection Onboard low drop voltage regulator Power switch and Power indicator LED Size: 5.6cm x 4.3cm Output data type: Outputs: 8, 5V, TTL / CMOS level, Buffered with IC 74HC245 Output gives logic 1 till key of the transmitter is pressed You can transmit multiple commands at the same time by simultaneously pressing multiple keys. Which also means you can use few keys as shift key and probably control up to 255 devices. Outputs are non latched types. I.E. outputs will remain logic 1 till the remote transmitter s key is pressed. NEX Robotics Pvt. Ltd. 2

3 Valid data confirmation output for customization Kit Contains: Remote Control Transmitter Remote Control Receiver 434 MHz ASK Transceiver Module (soldered on the transmitter and reciver) Transmitter Figure 2: 434 / 315 MHz 8 Channel Secure Remote Control Transmitter Remote control transmitter has 8 switches arranged in configuration. Each key has number from 0 to 7 corresponding to its bit number. When a particular key is pressed, bit corresponding to that number on the reciver will become logic 1. To power up the remote, give 7 to 12V to the power connector and turn on the power switch. You can also power remote transmitter using 9V battery. Make sure that security bit settings on transmitter and reciver are identical. All the security bits of the remote control transmitter and reciver are factory set at logic 0 or 1. Low drop voltage regulator is used to down convert supply to 5V from 7to 12V input supply. Remote is reverse polarity protected. Make sure that transmitter module is inserted in its socket such that non component side of the transmitter is facing upwards as shown in the figure. HT640 encoder chip converts the logic inputs from the switches and the security bit settings from parallel to serial and transmits it via 434 / 315 MHz transmitter module. NEX Robotics Pvt. Ltd. 3

4 Transmitter has on onboard track antenna. To enable it you have to short pad as shown in figure 3. For longer range you can solder wire on the pad marked as ANT. Robot can also be controlled by PC by soldering DB25 male printer port connector at the bottom side of the PC and connecting it with the PC. This feature is not yet tested. Figure 3: Selecting track antenna / wire antenna on the remote transmitter NEX Robotics Pvt. Ltd. 4

5 Reciver Figure 4: 434 / 315 MHz 8 Channel Secure Remote Control Receiver Remote control receiver has 8 logic output corresponding to 8 switches on the remote control transmitter. When a particular key is pressed, bit corresponding to that number on the reciver will become logic 1. Output of the HT648 decoder is buffered using IC 74HC245. Channel output status is also displayed on the LEDs. Output can drive any 5V TTL / COMS compatible output. Reciver can be powered by 7 to 12V or by 9V battery. Make sure that security bit settings on transmitter and reciver are identical. All the security bits of the remote control transmitter and reciver are factory set at logic 0 or 1. Low drop voltage regulator is used to down convert supply to 5V from 7to 12V input supply. Remote is reverse polarity protected. HT648 decoder chip receives the serial data from the wireless reciver and decodes it in to parallel. If security bits are matched it makes pin VT as logic 1 and outputs the bits corresponding to the switches on the remote transmitter. Receiver has on onboard track antenna. To enable it you have to short pad as shown in figure 5. For longer range you can solder wire on the pad marked as ANT. Remove Jumper for LEDs (J1) to turn off the LEDs used for channel status indication. NEX Robotics Pvt. Ltd. 5

6 Figure 5: Selecting track antenna / wire antenna on the remote receiver Note: For more information on the remote control operation, refer to the HT640 and HT648 datasheets on the product page. Schematic: Figure 6: Representative schematics (Courtesy HT640 ad HT648 datasheet) NEX Robotics Pvt. Ltd. 6

7 Content of this manual is released under the Creative Commence cc by-nc-sa license. For legal information refer to: Product s electronics is static sensitive. Use the product in static free environment. Read the user manuals completely before start using this product Recycling: Almost all the part of this product are recyclable. Please send this product to the recycling plant after its operational life. By recycling we can contribute to cleaner and healthier environment for the future generations. NEX Robotics Pvt. Ltd. 7