* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download sensors and robotic environment for care of the elderly
Survey
Document related concepts
Telecommunications engineering wikipedia , lookup
Fault tolerance wikipedia , lookup
Stray voltage wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Buck converter wikipedia , lookup
Electronic engineering wikipedia , lookup
History of electric power transmission wikipedia , lookup
Wassim Michael Haddad wikipedia , lookup
Distribution management system wikipedia , lookup
Public address system wikipedia , lookup
Rectiverter wikipedia , lookup
Mains electricity wikipedia , lookup
Alternating current wikipedia , lookup
Transcript
Sensors and Robotic Environment for Care of the Elderly S. C. Mukhopadhyay and G. Sen Gupta Massy University, Palmerston North, New Zealand Singapore Polytechnic, Singapore Presenter: Yang Fei [email protected] The 10th of December, 2011 System developed for the elder care Sub-systems: 1 Selective Activity Monitoring(SAM) system(detect the electric appliances) 2 Low-cost Physiological Parameters Monitoring(PPM) system 3 Web-enabled, robot-based vision system (get pictures) 2 Intelligent Systems Lab. Selective Activity Monitoring(SAM) system Objective: monitor electrical appliances Appliance Cellular modem Sensor Unit RS232 Appliance Appliance Central Controller Unit Sensor Unit RS232 PC Sensor Unit Function block diagram 1 The Sensor Units 2 The Central Controller Unit 3 A PC and a cellular modem 3 Intelligent Systems Lab. System architecture Electrical appliance: such as a reading lamp, room heater. (detect the current) Communication between PC and the central controller: RS232. Communication between sensor units and the central controller: Radio. Radio communication: frequency: 418MHz maximum data transfer rate: 40kbps A cellular modem: send short messages Wavecom Wismo cellular modem-WISMO218 (GSM/GPRS wireless communication module) 4 Intelligent Systems Lab. Core components of the Sensor Unit(SU) microcontroller 5 Intelligent Systems Lab. Design of the Sensor Unit Power: 230V/50Hz AC mains 5V&3.3V DC mains Radio Frequency module: Radiometrix(company) BiM418 transceiver half-duplex operation at 418MHz Left:TXM-418-5 transmitter right: SILRX-418-5 receiver 6 Intelligent Systems Lab. Parameters of the system TxSelect/ RxSelect: configure the transmit or receive mode of the RF transceiver Tx/Rx: transmit and receive data (data rate: 38400 bauds) series communication ports Microcontroller: SiLab C8051F020 radio frequency module RxSelect TxSelect Tx Rx microcontroller 7 Intelligent Systems Lab. Microcontroller ATmega128 8 Intelligent Systems Lab. Baud One concept in analog modulation: symbols per second or pulses per second. M: different voltage levels R: bps fs: baud 1 00 0 1 0 0 0 1 0 1 R=f s log 2 ( M ) 1 1 1 0 9 0 0 Intelligent Systems Lab. Current transformer connections and circuitry CT(Current Transformer): coil based on electromagnetic induction AC current DAC: programmable voltage of the Digital-to-Analog(DAC) converter output of the microcontroller LM329(? voltage regulator): op-amp (opposite amplifier) based comparator. National Semiconductor Corporation(USA) Professional comparators: LM339, LM393 Comparators: LM324, LM358, μA741 , TL081/2/3/4, OP07, OP27 Nonlinear current change Nonlinear magnetism change Nonlinear current change 10 Intelligent Systems Lab. Current transformer connections and circuitry External interrupts: a series of pulses(50Hz) sent to microcontroller Power need: single +5V DC. Peak voltage: 2V (when load current is 10A) Resistor: 120 Ω Voltage shifted up: 2.5V (avoid negative voltage at the input of the comparator) Coil inductance +2.5V 11 Intelligent Systems Lab. Detect the status of an appliance Detection software: continuously evaluate whether the load is active or not Interrupt: every 500ms Active: 10 external interrupts occur within 500ms. External interrupt Receive timer generated interrupt Count numbers of current pulses If number of current pulses is greater than 10 Set activity variable low Set activity variable high Restart the timer and clear the current pulses count 12 Intelligent Systems Lab. Design of the Central Controller Unit(CCU) Similar to the SU(Sensor Unit) LED: 1 indicate the power to the CCU is on 2 show that the CCU is in transmit mode 3 indicate that the CCU is in receive mode RS232: 115200bauds (115200bps) 13 Intelligent Systems Lab. Radio Frequency Communication protocol All the sensor units communicate with the central controller unit on the s ame frequency Method: the sensors will respond only when told to do so. PC requests data from a particular sensor PC PC receives the data from the specified sensor Central Unit Controller initializes the particular sensor Controller interprets the data and relays it to the PC Sensor Unit Sensor responds with the activity data 14 Intelligent Systems Lab. Radio frequency communication packets RF communication packet sent by the controller: Start byte ID byte end byte RF communication packet sent by the sensor unit: Start byte ID byte activity byte end byte Description Hex Value Binary Value Start byte 0x55 01010101 End byte 0x6C 01101100 ID byte: 1 0x63 01100011 ID byte: 2 0x33 00110011 ID byte: 3 0x36 00110110 ID byte: 4 0x3A 00111010 Activity byte: active 0x53 01010011 Activity byte: inactive 0x69 01101001 15 Intelligent Systems Lab. conclusion This paper presented the design of a Selective Activity Monitoring system and the applied research into the implementation issues. completely fabricated system the sensor unit 16 Intelligent Systems Lab.