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Hello We wish to sense 200mA of current max in a led drive circuit and there will be 200v of potential between the current sense bit and the output signal bit. No Hall sensors seem to do low these are all up to at least 20A
Hello We wish to sense 200mA of current max in a led drive circuit and there will be 200v of potential between the current sense bit and the output signal bit. No Hall sensors seem to do low these are all up to at least 20A
The BISS0001 only has an on/off output control so you can't modify it directly, you will have to add extra circuitry that ramps the led current up and down instead of just turning it on and off. We need to know the led rating to advise on how to do this. Brian.
other objects such as a meterstick (held from a long distance), scissors, or a pencil also create the same effect. Also, the circuit also randomly inverts (sometimes it gets brighter the closer we get, sometimes it inverts and becomes dimmer the closer we get). Your question has been already answered in post #4 and post #5. Co
Hi, This solution doesn't use a PIR, but I can't think of any solution for what you describe... If the room only has one entry point, maybe an ir led across the doorframe could be used to latch on for entry and off for exit from the room.
Dear all, We are authorized distributor for Seoul semiconductor products. If you need any led products from Seoul, Please contact me. Product, 1. Acrich Series 8. Chip/ sensor 2. nPola 9. Mid Power led 3. WICOP Series 10. High Power (...)
TV's often are operated in a lit up room. For that reason the sensor has a filter on it, which blocks visible light. If there is a chance your visible remote led's could get through, then you need to drive them brightly. It also helps if they are narrow beam type. Additionally, see if you can get at the sensor and remove (...)
A simple way is an IR/light sensor, aimed toward the point where a human's waist should be 3 to 6 feet ahead of the robot. Mount an IR/led on the human, transmitting a wavelength which the sensor is sensitive to (with filtering, etc., as needed). A single photodetector probably is insufficient. Consider an array of 3 or 4 (...)
You need to sense when somebody is coming toward the stairs to turn on the leds so they can see where to step. The person coming towards the stairs is walking on a level floor and the sensor can be at a good height. If you detect the person trying to find the stairs in the dark then the leds will light as (...)
uh oh! I missed this part!!! sensor pin should be input!!!! void main (void) { sensor_pin = 1; // only logic 1 can be input in any MCS-51 arch led could be any starting value (0 is ok)
It is easy to guess that the MCP23S17 only detects a high reading if the voltage goes above a certain threshold. I believe when the led turns on, it draws a few mA, which pulls the sensor wire to a lower voltage. It will help if you install a transistor to detect the signal. Then the transistor turns on the (...)
led current and pulsed versus DC operation will be commanded by your application. Nobody can answer the question without knowing your optical design. We can guess that modulated light (=pulsed led) may be preferable because it's a way to get rid of ambient light interferences.
Hi, I'm trying to get response from DHT22 sensor with PIC12F675, but something is wrong... Here is my code: #CONFIG __config _HS_OSC & _WDT_OFF & _CP_OFF & _MCLRE_OFF & _BODEN_OFF & _PWRTE_OFF #ENDCONFIG DEFINE OSC 4 CMCON = 7 : OPTION_REG.7 = 0 led var GPIO.2 DHT var GPIO.0 pause 100 output DHT high DHT pause 1
Hello!! I need to interface LPC115 controller through I2C for a touch sensor, For that sensor to work I can use an ATMEL controller. But before going to this I just want to interface I2C with an led. So kindly suggest me on how to proceed. Thank you.
are you sure you want to detect darkness or loss of power or both? The key aspects require the light sensor to be blocked from light from the leds and battery backup.
One way to test Ambient light is to pulse a reference led onto the ambient light sensor to indicate minimum LUX level threshold. Then if sensor gets dirty from a spec of dirt the size of sensor chip <1mm it will be self calibrated by 5mm emitter pulses. Using S&H analog switch and logic you can design it to (...)
Assuming the train has an electrical supply from the tracks or an internal battery, all you need is a reed switch at the rear of each tender and a magnet at the front of each tender. The reed switch turns the led on if there is no magnet close by, in other words the tender without one following it. No need to check any other part of the train, it's
I am creating a GSM project with GSM input to RX/TX of the PIC16F877A .Also I am using a PIR sensor which outputs 3 v and is connected to RB0 . INTEDG is set to 1.When an interrupt happens, an led is made to toggle. I have a few problems here : When the RB0 is connected to 5v using a switch, then only when switch is closed, the (...)
You have to learn PIC UART communication and IR sensor TSOP1738. Modulate serial data with 38khz signal(can be generated by pwm in pic) and send to IR led. The tsop will do the demodulation and gives back the serial data. Google it you will get lot of examples.
led's produce voltage when exposed to light. A yellow led is in the same range as human vision. I just tried an experiment. I find it can put out a few tenths of a volt in bright light. But very little current however, maybe 0.3 uA.
Not sure which sensor you are actually using, 02BZ2.2 is a zener diode. Presumed it's any kind of photodiode (or a led used as photo diode), you can expect better results when operating the diode in zero voltage bias than in photo element mode. See the below circuit as an
STC8051+AVR+atmega Professional Kit is a high-performance development board with rich board resources. The board has many peripherals such as dot matrix led, color dot matrix LCD, SD slot, PS2 port, stepper motor driver, DC Motor, infrared sensor and temperature sensor. It reflects fully STC Microcontroller performance. (...)
i write a code to test my HC-SR04 sensor to measure distance but seem there is no responce from the sensor, after i program and when i turn on the pic, the led from port A0 turn on and not turn off even i move more than 100 cm..pls help i'm using pickit 2, mplab ide wit c18 compiler, internal OSC 4Mhz.. tq (...)
In contrast to the transmissive sensor that relies on the presence of ambient light, a simple (DC) reflective sensor requires ambient not to exceed a certain intensity. No idea if this can be assured in your application. Reflective sensors are available as single component comprised of an IR led and a (...)
That is led blinking. You want to control the power to Ultrasonic sensor module or what to send trigger pulse ? If you want to control the power to module then you have to use a relay, transistor or mosfer controlled by MCU.
Check the core temperatures with hwmonitor. If any sensor gives unusual read out, look into it. Another thing is the power supply, make sure it is not faulty or overheating. Does your motherboard has power led onboard? does it turn off when the pc power of itself?
I would have gone with something much simpler. A light sensor which directly controls the current or PWM to a bank of led lights.
Recently the washer died and while checking LNK304PN and R1 (22ohm), 4.7u450v was replaced to bring it online. However when switched on, immediately getting PE error after ON symbol with wash cycle led's blink. Pressure sensor (E1) is already validated. The machine was working with a older version of PCB and I need to fix the new (...)
Am using DRF_1605 module which works on zigbee technology. i am able to read temperature data from temperature sensor by using these modules, Now i want to transmit feedback from the coordinator to the other 3 nodes by using zigbee technology it is work but i put a led on the PORTA as output to the feedback and it doesn't work. :sad: any (...)
Presume you mean the series resistor for the led. I think 60mA DC is probably around the max. If you want to play around I suggest around 220R is a safe starting point no lower than 56R if you need more output. Transistor Emitter to ground, Resistor from collector to +5v 10K is a good starting point but not critical. Output to logic/amp is from col
Usually the IR remote controller is made using IR led and TSOP1738 sensor together with the use of serial port of any micro-controller to send codes.If you want to use TSOP1738 ,you have to generate 38kHz 50% duty cycle signal to drive IR led.Choose any PIC uC with PWM feature ,then you can use PWM to (...)
My question is related to thread . but since the thread is old i am starting a new one. I want to build a sensor using led so i need a constant brightness and temperature compensating driver (so no drift in wavelength with T) with a good precision. I have come across the CL2 series from Microchip (prev
The sensor MPU computes pulse and outputs BPM directly. It works on refelection of IR led to photo sensor of blood pulse flow.
Hey guys..can somebody help in my project.. I need a source code and schematic diagram that will turn on the led if the Ultrsonic sensor US-100 detects an obstacle and will turn off if there is no obstacle using PIC16f877a..thank you..God bless..need it badly..
You could even use the PV sensor to drive an NPN to disable a self biased Type N FET to switch the led from the low side.
This can be solved depending on sensor logic when A&B are active high or low. Which sensor? If A&B = 1 for led= On using high side driver. AND logic If A&B = 0 for led= On using high side driver NOR logic If A&B = 1 for led = On using low side driver NAND (...)
Not Sure Why the Zener or the Diode was put in there. Other than possibly to Help Square the wave. Just Remove Both of these diodes. And the Resistor should limit the current enough to the led to protect it from damage.
To extend the range of your light sensor, try to modulate the led current by say 1 kHz, then use a narrow-band audio amplifier for photo-diode output signal. I achieved ~10 meters range by this. Ultrasonic sensors can work, too, also by amplifying the returned signal t the ultrasonic frequency to get the range.
The opamp is missing a positive power supply voltage. The opamp has WAY TOO MUCH positive feedback. EDIT: Nothing limits the current in the leds.
There are specific optical sensor arrays for optical encoder. For high precision the sensing is quite complex but can be done with single chip optical encoders. They include compensated control of the led for scanning a code disc. A good source of information about optical encoder iCs you can find on the web:
You can use TSOP17 INFRARED receiver module and an ir led with 38khz pwm. place both in front. You can set the sence range to 1 foot. Goggle search will give you working circuit also.
Hi ahsan, can you provide a system level schematic of IR proximity sensor, which indicates how does the op amp, ADC, led, photodiodes and microcontroller connect to each other?
You forgot to turn OFF the led otherwise : if (ADC_value>Temp35) { RB0=1; } else { RB0=0; } +++
The eye can see over 10 decades of light intensity, but you may be only interested in a narrow range with 3 levels. Can you specify this? Also do you need to diffuse the light sensor to detect average light level? A good design always starts with a good spec. You can surf
Hi guys. I'm new to this C programming language. is it possible to display the temperature that measured by LM35DZ to led DOT matrix display? i cant find the tutorials everywhere. Attached the led dot matrix datasheet.
Hi all, I'm working on an optical sensor and am looking to increase my SNR. I've constructed a circuit to cancel out led emitter noise with feedback control. PDref monitors just the emitter, while PDsig carries the sensor signal + emitter noise. Feedback consists of integrator -> JFET VCR -> current divider. Please see (...)
That's exactly what I would do, try to avoid a multiple of your mains frequency, as flourescent lighting "blinks" at 2 X Fmains, so 975 HZ for 50 HZ mains or 990 for 60 HZ. Frank sounds like the best way, though another way might be to measure the ambient light, pulse the led[to get more contrast between led on
My mailbox is about 50m from my house and out of sight. I bought a mailbox with a hinged lid and fitted a magnet to it, on the box is a red switch wired back to the house. When the lid is llifted, the switch opens and a led lights indoors. So it doesn't detect if mail is present but it does detect if the mailbox lid was opened by the postman.
Just found stuff like this to simplify it quite a bit: This looks like an led sequencer. If that is what you are looking for, then you might be interested in the 4017 decade counter. This IC is popular and easy to use. It lights 10 led's one at a time, in s
If the led is the source emitting coded light/UV, you can use a Light sensor to detect the transmitted light and then convert them to digital signals, then do the rest of the processng.