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hello, i am trying to write a program for dspic30f4012. I have a requirement to call a adcvalue() function within an interrupt routine of timer1. This adcvalue() function needs to switch on the ADC. Load the digital values of analog signals at AN0 and AN1 to variables defined as data1, data2. And then again turn down the ADC. This cycle r
Not quite sure what you're trying to do there, but it looks like there's a lot wrong. 1) You've got a diode in series with sensor output which will allow only negative signals through, but your opamp is referenced to ground. I think you want to turn that diode around and maybe put a resistor to ground on the opamp input. 2) Your opamp is open loo
Looks to me like you are driving both transistors on each side at the same time instead of 'crossing over' the drive signals diagonally. I think it will work, but only for one PWM cycle before burning out ! You also have no dead-band period and I suspect the transistors will not have sufficient Vgs to full turn on. Brian.
If the turn ratio of the transformer is wrong and there are more turns in output coil than needed then it will produce higher voltage level in output. The feedback circuit will try to regulate it by reducing duty cycle and you will see a narrow pulse of PWM output especially when there is no load present. .
You have a channel input to route your current through and a channel to route your voltage into. The chip has some options to turn the gain and do filtering for you (which maybe helpful for cleaner signals). It has a selectable output frequency for your controller. So what you would do is: 1.) Set your gain and filter preferences with the G pins
A base-emitter resistor is always a good idea to ensure the transistors turn off. Keith
This resembles the common-base configuration, where the signal is applied at the emitter leg. It is most useful when the incoming signal has low amplitude and low impedance. Example, detecting signals in a wire coil. Suppose we need a microphone, but all we have is a speaker. It is possible to turn a speaker into a microphone. The voice coil wil
Even if your RF system is for on and off only, the received signal should have a specific characteristic (likely a digital key address) so that signals from other transmitters (at the same frequency) cannot turn on or off your device. that is so true ..... I neglected to comment on that in my previous post the
A schematic is needed to answer that question but I can make a guess at the reason - if you are directly driving the gates of the MOSFETS from the PIC they never turn off, you would be applying the wrong polarity signals to the gates. I assume you have the tap in the transformer grounded and the MOSFET source pins connected to a +12V supply so the
The 555 can be put to use in a variety of ways. It has several components built into it, and a clever designer might find unconventional methods of applying them. I would not be surprised if the output pin produces PWM signals for the lowermost circuit (which we do not see entirely). In turn, an incoming line goes to the trigger pin 2. I believe i
You could use a 74HCT4066 for this. The chip has four independent analog switches which turn on by a control signal (from your MCU). It is very inexpensive and often used to switch audio signals. There are other, similar choices, including chips described as specifically for a
If you are going to put a DAC in your amplifier, regardless of the 'quality' of components or clock signals, you need to know what format the digital input is going to be. To be perfectly honest, there is very little difference in quality of audio DACs, after all they are only there to turn numbers into a voltage and if the numbers are corect and s
I'd use the cross() calculator function looking for the right-sense zero crossings, and do the arithmetic to turn time into degrees. Timebase being the fundamental period of whichever phase you call the master reference.
Please give us more information on your requirenments for example: There are two motors for each eye ; an up-down motor and a left right motor The signals of the eye detector are eye turned left (boolean) eye turn right(boolean) and the same for up and down The motor will keep on running whilst the eye turned left signal (...)
Hi all, I want to use a load switch as a switch to turn on and off the power to support circuitry that I have. A microcontroller which will be powered ON at all times will provide the control signals. I have a couple of questions on load switches. I was planning to use a Vishay Si1869dh load switch @ Vin = 15V, Von/off = 3.3V. I want the Vo
In my country there is no need to turn off the phone when you go in a bank.
All mopeds have to be equipped with turn signals and brake lights, according to traffic regulations. Some older vehicles of this type don't have those, that is why brake light and turn signals of own production are v
of course it should be nonoverlapped. Or your two switched will burn out if the turn on resistor is too small
Here is the simple solution. Left arm straight out = left turn Left arm bent toward sky = right turn Left arm bent toward ground = Stop or for a electrical solution HowStuffWorks "How turn signals Work" Lighti
Hi T805, If you have experience with microcontrollers, just pick the one you are comfortable with, derive its clock from a crystal to get an accurate time base and just write a code to count the clocks and give out the ON/OFF signals on the ports. You can then drive the turn ON/OFF transistor gates/base with those signals to (...)
If you really want to get all levels between low and high then you probably need capacitive slider - depend on the level in the tank you'll get different measured signals. Atmel offers some ready to use capacitive sliders like QT511, but by loading QTouch library in your project you can turn any Atmel uP into capacitive sensor. The mechanical desig
Hi, To generate a bus of signals as the stimulus, I want to build a veriloga model. the input will be a voltage pwl source which in turn gives the voltage vaule versus time with a transition time. the output will be the corresponding bus value. For example, when input voltage is 6, the output will be 1.8V, 1.8V, 0 (that is 3'b110) my problem is
I've not checked your code deeply, but don't you forgot the instructions "out PORTC,Rxx", and "out PORTB,Rxx"? Without these instructions, you're not changing the values on the ports, so you are not generating the signals to turn on the leds. Regards.
Hi Guys, In my project, I need to control Home appliance (like turn ON/OFF them) over wireless network. I am using a micro controller based small hardware board that receives the commands over wireless. The board has digital I/O pins. I am thinking of using a relay that will be connected to these pins. On receiving the ON command, mi
Hi I just have a simple question. I know the problem falls under the issue of bouncing signals. I'm feeding a Limit switch with 230Volts AC (50HZ) which when turns on a starter. When the the starter needs to be turned off another limit switch is used to turn off the starter. The starter is used to hold the solenoid (...)
pull up is necessary and adjust the contrast of LCD and see if you get black box when you turn the pot
turn up the brightness control full. Darken the room and watch screen closely when switching of the scope. If there is any brief flash on the screen then chance is good that CRT is OK and there is another problem with blanking, control signals etc.
Hi, I am currently doing a design with an FPGA to control a bus signal in a control board industry. What the board can be updated easily by the client and can be adapted to different teams. By this I mean that you can turn on or off certain signals, as well as for other industrial board, has a different processing of signals. I used the (...)
Redesign the board? Lots of groundplane, dont have breaks in it, dont have breaks in the return path of noisy/sensitive signals. Keep sensitive signals away from noisy ones, find out whats generating the noise in the first place & redo that section of board (if not all of it).
SAW filter (Surface Acoustic Wave filter) A semiconductor device that is used to filter out desired frequencies. Widely used in mobile phones to filter both RF and IF frequencies, a SAW filter uses the piezoelectric effect to turn the input signal into vibrations that are turned back into electrical signals in the desired frequency range. (...)
I'm a beginner electronics user, actually going to school for Computer and Electronics Engineering Technology, but I just started. I've always enjoyed working with electronics, even with the limited knowledge I have. On my motorcycle I want to eliminate the rear fender. Only problem is, the rear turn signals are mounted to the rear fender. I can
Time ago I make a small robot that turn left or right upon is an obstacle in front of it, the idea is simple: I use a LM567 (PLL tone detector) for detect signals from a phototransistor connected like this: ....... VCC ........| ........\ ......../...22Kohm .......|----------------------------||----------> Out signal to pin 3 LM567 .
Hello friends, Once more I need your help. I´m working on a rotary encoder that generates 50 pulses/turn. One of the direction signals is conected directly to the interruption of the 8051 and the other is connected to the P0^3 port, in such a way that when an interruption is generated by a falling edge the P0^3 is checked to see if its 1 or 0