[0038] Example 1
[0039] The present invention provides an industrial remote control, specifically as figure 1 Shown, including transmitter and receiver, both receiver and transmitter have a learning function. The transmitter includes an operating button 1, a magnetic key 2, a first microcontroller 3, a first radio frequency chip 4, and a transmitting antenna 5. The receiver includes a second microcontroller 7, a second radio frequency chip 8, a receiving antenna 9, and a learning switch 10 and multiple relay switch 6;
[0040] The connection relationship of each component is: the operation button 1 and the magnetic key 2 are electrically connected to the signal input end of the first microcontroller 3, and the signal receiving end of the first radio frequency chip 4 is electrically connected to the signal output end of the first microcontroller 3. Connected, the signal transmitting end of the first radio frequency chip 4 is electrically connected to the transmitting antenna 5;
[0041] The multiple relay switches 6 are electrically connected to the signal output end of the second microcontroller 7, the signal transmitting end of the second radio frequency chip 8 and the learning switch 10 are all electrically connected to the signal input end of the second microcontroller 7, and the second The signal receiving end of the radio frequency chip 8 is electrically connected to the receiving antenna 9, and data transmission is performed between the transmitting antenna 5 and the receiving antenna 9 through wireless signals.
[0042] To facilitate viewing, the transmitter also includes a status indicating LED light 13 which is electrically connected to the signal output terminal of the first microcontroller 3. In this embodiment, the operation button 1 includes an on button, an up button, a down button, an east button, a west button, a south button, a north button, and an alarm button. Each key can be combined according to the function and needs. Press and operate the specific key combination of key 1 to launch a pairing instruction; software protection is adopted for the specific key combination (such as the up and down keys; the east and west keys; the south and north keys ; These buttons can be configured through software to determine whether they are mutually exclusive and self-locking), which improves the protection measures, which can effectively prevent the misoperation of the operator and is more practical and reliable.
[0043] In this embodiment, the first microcontroller 3 and the second microcontroller 7 are both TI’s ultra-low power single-chip MSP430G2553, and the first radio frequency chip 4 and the second radio frequency chip 8 are both TI’s excellent radio frequency chip CC1101. , Higher cost performance, more reliable stability. Further, the transmitter of this embodiment further includes a status indicating LED light 13 which is electrically connected to the signal output terminal of the first microcontroller 3. The operation button 1 includes eight buttons, which are the on button, the up button, the down button, the east button, the west button, the south button, the north button and the alarm button.
[0044] figure 2 Is the circuit diagram of the first microcontroller of the transmitter, image 3 The circuit diagram of the first radio frequency chip of the transmitter; the reed switch S1 is used to detect the state of the magnetic key 2. When the magnetic key 2 is removed, the reed switch S1 is in an open state, and the second pin of the first microcontroller 3 is The pull-up resistor R14 is in a high level state. At this time, the transmitter enters an emergency stop state. Even if any key of the 8-way buttons is pressed, data will not be transmitted. In this embodiment, the radio frequency chip CC1101 works in the 315MHZ frequency band, and its circuit adopts the typical application circuit in the CC1101 chip data manual provided by TI.
[0045] Further, the transmitter of this embodiment further includes a transmitter power supply 11, the transmitter power supply 11 is two AA batteries, the voltage of the transmitter power supply 11 is 3V, and the transmitter power supply 11 supplies power to the first microcontroller 3. Because the normal operating voltage range of the microcontroller MSP430G2553 and the radio frequency transceiver chip CC1101 are both 1.8V to 3.6V. Therefore, the transmitter power supply 11 can ensure that the microcontroller MSP430G2553 and the RF transceiver chip CC1101 work normally under low power supply voltage, reduce system power consumption, extend the life of the transmitter battery as much as possible, and achieve low power consumption design from the hardware aspect aims.
[0046] At the same time, the receiver also includes a receiver power supply 12, and the receiver power supply 12 supplies power to the second microcontroller 7; Figure 4 As shown, the receiver power supply 12 includes a transformer T1, a two-way transient suppression diode D30, a varistor R5, a rectifier bridge BR1, a capacitor C3, a resistor R13, a diode D31, a voltage stabilizing chip U3, a voltage stabilizing chip U4, a magnetic bead L7, Capacitor C41 and bidirectional transient suppression diode D23; the current input terminal of transformer T1 receives 36V AC power, and the current output terminal of transformer T1 is connected in parallel with bidirectional transient suppression diode D30, varistor R5 and rectifier bridge BR1, resistor R13, diode D31 and voltage stabilizer chip U4 are connected in parallel. One end of resistor R13, the cathode of diode D31 and the current input end of voltage stabilizer chip U4 are all connected to the anode of rectifier bridge BR1. One end of resistor R13 and the anode of diode D31 are both connected to the anode of capacitor C3, voltage stabilizer chip U4 The current output terminal is connected to one end of the magnetic bead L7, and the other end of the magnetic bead L7 is connected in parallel with a capacitor C41, a bidirectional transient suppression diode D23 and a voltage stabilizing chip U3 in sequence. The AC 36V power supply is sent to the primary winding of the transformer T1 through the connector JP7 and the fuse F1, and 12 AC voltage is output through the secondary winding of the transformer T1, and the full-wave rectified by the rectifier bridge BR1 and filtered by C3 to output a DC voltage of about 16V. The bidirectional transient suppression diode D30 is used to absorb transient pulse interference, and the varistor R5 is used for overvoltage protection. Resistor R13 can reduce the surge current at the moment of power-on and increase the working life of the rectifier bridge. The diode D31 provides a low impedance path when C3 is discharging, which can reduce the energy loss of the resistor R13. F2 is a 0.5A self-recovery fuse, which plays the role of over-current protection. The light-emitting diode D17 is a power indicator. A DC voltage of about 16V passes through a current-limiting resistor R22 to provide working current for D17 to make it glow. The voltage regulator chip U4 converts the DC voltage sent from the rectifier filter circuit into a stable 12V voltage output. Magnetic beads L7 and capacitor C41 are filter components to reduce power supply noise; bidirectional transient suppression diode D23 is used to absorb instantaneous pulse interference; these devices improve the anti-interference ability of the product. The voltage regulator chip U3 is a 3.3V integrated circuit (AMS1117-3.3), which converts the 12V voltage into a stable 3.3V DC voltage output, and provides power for the microcontroller U1 (MSP430G2553). The application of magnetic bead L7 and bidirectional transient suppression diode D23 improves the anti-interference ability of the circuit.
[0047] The second microcontroller 7 and its BSL interface circuit such as Figure 5 As shown, the R2 and C2 parameters in the reset circuit determine the length of the reset time. If R2 and C2 are soldered or damaged, the MCU program will not operate normally, and the program cannot be downloaded (programmed) with the emulator or downloader. The BSL interface circuit is used for program download, and P3 is used for connecting the radio frequency module. The light-emitting diode D6 and the current-limiting resistor R4 are the working status indicator circuit, which are used to indicate the paired learning status or program debugging. DIP switch S1 is a pairing learning switch. After S1 is closed and powered on, the industrial remote control receiver enters the pairing learning state; after S1 is disconnected and powered on, the industrial remote control receiver enters a normal working state.
[0048] Image 6 It is a circuit diagram of the second radio frequency chip 8. In this embodiment, the radio frequency chip CC1101 works in the 315MHz frequency band, and its peripheral circuit adopts the typical application circuit in the CC1101 chip data manual provided by TI. In order to improve the working reliability of the radio frequency module, the power supply circuit of the radio frequency module adopts two voltage regulator chips, among which U8 uses the ultra-low noise voltage regulator chip RT9193 to ensure the stability and reliability of the power supply of the radio frequency chip. Magnetic beads L5 and capacitor C31 are filter components used to reduce power supply noise. The bidirectional transient suppression diode D32 is used to absorb instantaneous pulse interference and can also play a role in overvoltage protection. U7 regulates the 12V input voltage to 5V, U8 regulates the 5V voltage to 3.3V and outputs it to the CC1101 chip. The connector P5 is connected to P3 of the control board via a cable.
[0049] Relay switch 6 output circuit such as Figure 7 As shown, the control signal output by the single-chip microcomputer is amplified by ULN2003 to drive the relay. A diode (1N4148) is connected in parallel on each relay winding to absorb the self-induced electromotive force generated on the relay winding to protect the drive chip ULN2003 from being damaged by breakdown.
[0050] The learning process of the receiver and transmitter in this embodiment is as follows:
[0051] The learning process of the receiver is:
[0052] Step 1: Turn the learning switch 10 to the ON state before powering on, turn on the power of the receiver, the receiver enters the learning state, press the power button of the transmitter to make the transmitter on;
[0053] Step 2: Long press the up button and down button at the same time to close the up button and down button at the same time, the receiver learns the SN code and CH code of the transmitter, after the learning is successful, the indicator light of the receiver flashes;
[0054] The third step: the receiver learning is completed, turn off the power of the receiver, turn the learning switch 10 to the OFF state, turn on the power of the receiver again, and the receiver enters the normal working state.
[0055] Preferably, the transmitter that needs to be learned becomes the target transmitter, and the learned transmitter becomes the source transmitter. The learning process of the target transmitter is:
[0056] Step 1: Turn off the power to the target transmitter, and press and hold the East button and West button at the same time to close the East button and West button at the same time;
[0057] Step 2: Turn on the power, the status of the target transmitter indicates that the LED 13 is always on. At this time, you can release the East button and West button, and press the power button of the source transmitter to make it in the boot state;
[0058] Step 3: Long press the up and down buttons at the same time to close the up and down buttons at the same time. The target transmitter learns the SN code and CH code of the source transmitter. After the target transmitter learns successfully, the status indicator LED 13 goes out. Finish learning.
[0059] Software Design of Industrial Remote Control
[0060] The software program is written with the design idea of ultra-low power consumption, which makes full use of the advantages of MSP430G2553 MCU in terms of ultra-low power consumption. In terms of current consumption, it is lower than similar remote controls, more energy-saving, and effectively extends the use of batteries in the remote control. life.
[0061] 1. The main program flowchart of the transmitter is as follows Figure 8 As shown, the flow chart of the SN code and CH code learning subroutine is as follows Picture 9 Shown. The detection of button closure is handled in the port interrupt program. When the button is pressed by the user, the button changes from the open state to the closed state, and the corresponding microprocessor port generates a falling edge transition to cause the port interrupt to be generated. The port interrupt wakes up the micro control In response to the port interrupt, the microcontroller executes the port interrupt program, recognizes the closed button in the port interrupt program, and performs corresponding functions (mainly assigning corresponding values to the sending buffer).
[0062] In order to prevent mutual interference between multiple remote controls, a four-byte SN code is set in the transmitted data packet, and the SN code of the remote control that is shipped from the factory is guaranteed to be unique. In addition, in order to achieve simultaneous operation of multiple remote controllers without mutual interference in the same working area, frequency division multiple access technology is adopted, and the difference in CH code (ie channel code) is used to change the receiving and sending frequency of the radio frequency chip CC1101.
[0063] In the above software design:
[0064] (1) The length of the transmitted data packet is 8 bytes, the length of the SN code is 4 bytes, and the remaining 4 bytes are used for remote control function coding.
[0065] (2) When the interlock keys are closed at the same time, the interlock code "0x99" is sent, and the corresponding two relays are cut off at the same time.
[0066] Second, the main program flowchart of the receiver is as follows Picture 10 Shown. The flowchart of the SN code and CH code learning subprogram of the industrial remote control receiver software is similar to the flowchart of the SN code and CH code learning subprogram of the industrial remote control transmitter software.
[0067] The invention adopts software radio technology, and both the industrial remote control transmitter and the industrial remote control receiver have a pairing learning function. There is a DIP switch on the main board of the industrial remote control receiver. If you need to pair the industrial remote control transmitter with the industrial remote control receiver, just turn the DIP switch to the ON position and power on the industrial remote control receiver to enter the pairing In the learning state, the industrial remote control receiver scans and searches for the pairing instructions issued by the industrial remote control transmitter in the entire working frequency band; presses the specific combination key of the industrial remote control transmitter to make it transmit the pairing instruction; the industrial remote control receiver performs after receiving the pairing instruction Decoding process, memorize the SN code (identity identification code, unique) and CH code of the industrial remote control transmitter, thus completing the pairing function. Turn the DIP switch of the industrial remote control receiver to the OFF position and power on the industrial remote control receiver again, the industrial remote control enters the normal working state.
[0068] The writing of the software program adopts the design idea of ultra-low power consumption, and makes full use of the advantages of MSP430G2553 microcontroller in terms of ultra-low power consumption. In order to prevent mutual interference between multiple remote controls, a four-byte SN code is set in the transmitted data packet, and the SN code of the remote control that is shipped from the factory is guaranteed to be unique. In addition, in order to achieve simultaneous operation of multiple remote controllers without mutual interference in the same working area, frequency division multiple access technology is adopted, and the difference in CH code (ie channel code) is used to change the receiving and sending frequency of the radio frequency chip CC1101.
[0069] Three, test results
[0070] After many tests, it is found that when the transmission data rate of CC1101 is set to about 38K, the GFSK modulation method is adopted and FEC is turned on. The best remote control effect can be obtained under the condition of low current consumption. The measured performance indicators of the prototype are all Meet the actual requirements of the industrial site.
