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Design medical surgical light microcomputer control system
1 research
1.1 System Design Requirements
(l) automatically detects surgical lamp failure;
(2) surgical lights automatically switch function: equipped with two surgical operating table lamp,
When the main lamp failure, automatically switches to the backup lights work:
(3) light control buttons advise: Computer system power, the rent is pressed odd, surgical lights, the brightness of the lights: rent even times when pressed, surgical lights and brightness of lights are off; www.medicalprecise.com
(4) surgical lamp brightness display and control: surgical lamp brightness is divided into eight,surgical light with a light-emitting diode group display brightness for a time, a group of light-emitting diode; increased brightness level, increase a group of light-emitting diodes. Hardware system set up two buttons K2 and K3, after surgical lights turned on, press the button once K2, can increasethe level of surgical lamp brightness: Press the button once K3, surgical lights can reduce the brightness level;
(5) surgical lamp brightness value storage function: In addition to the system is first powered up, the lights turned on whenever the surgery, the brightness of the lamp brightness should be maintained during the last closed surgical lights;
(6) surgical lamp fault display: the two main light-emitting diode display and standby lamp failure, respectively, while the computer system automatically surgical lights switch. When the fault lamp replacement surgery, the corresponding fault LED is off;
(7) medical surgical lamp operating voltage: DC 24v;
(8) To prevent the system occurs under strong external electromagnetic interference "crash", the control system must be configured watchdog (v white tchdog) circuit.
1.2 determine the microcontroller hardware design choice 89LPC932 microcontroller. The microcontroller has 26 I / O ports, this project requires the use of 17 I / O ports (of which five inputs, 12 output ports), to prevent electromagnetic interference, seven unused I / O ports through 10K resistor connected to 3.3V power supply: as an input pin I / o ports, can be formulated as "input only"; as an output pin I / o port can be formulated as a "push-pull output mode." In our project, the following five input ports should be set to "input-only mode":
(1) Pl.O brightness increase button switch signal K2
(2) Pl.1 brightness decrease button switch signal K3
(3) Pl.4 surgical light button switch signal Kl
(4) P lived three main light detection signal
(5) P Stay 4 pay for the light detection signal
The following 12 output ports should be set to "push-pull output mode":
(l) P0.6
(2) P07
(3) P0.1 main lamp failure signal
(4) P02 pay lamp failure signal
(5) P2. Servant a P2.7 were eight LED control signals.
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