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138 Threads found on edaboard.com: Adc Pwm
You can generate variable pwm using one timer and one pot also. 1.make port pin ON. start timer with ON time period 2.when it expires load OFF time period to timing registers. And make port pin off Whenever adc value gets changed calculate new ON, OFF values for timer registers
The pwm duty cycle calculations don't apply to the given circuit which is no boost voltage converter. Instead you are chopping the solar panel output current. No problem if you don't need maximum efficiency. The "panel voltage" measurement isn't of much use unless you synchronize the adc with the pwm. Similarly the battery current is also (...)
The short answer is "it depends" If you want a three phase inverter, you may need one microcontroller with multiple pwm outputs. adc resolution is not really critical (8 bit gives better than 1% accuracy at the full scale)- but again, it depends. If may be better to have multiple adc ports so that you can check different faults (...)
Can some explain alternate dead time ALTDTR value calculation Given code and comment is from Microchip reference codes uController dsPIC33FJ06GS101 Few parameters adc and pwm clock is 117.92MHz ((FRC * 16) / APSTSCLR ) = (7.37 * 16) / 1 = 117.92MHz pwm output is complimentary with center aligned mode [CODE
Hello, I'm new to this forum and programming microcontrollers. I have programmed some however I'm not an expert, in fact I consider my programming quite dirt. Anyway I have this problem with a PIC16F1718 (I almost know the datasheet from top to bottom) I'm producing a pwm signal for converters. We were asked to control frequency and duty cycle b
A standard solution uses an all-digital PLL with the grid voltage as reference, comprised of adc, multiplier phase detector, PI loop filter, NCO with sine table. To generate the sine pwm, the NCO signal has to be multiplied with a factor to adjust the output to the actual grid voltage, usually driven by a current/power control loop. Fitting the
I have problems reading adc value, I have left justified result and need to read the bit 7 & 6 from ADRESL and save the value into CCP1X and CCP1Y to control the lowest bits of my pwm duty cycle. I have searched in my header file, but cannot find there how I can read the bits from ADRESL, I have been looking in my compiler manual aswell without
Add adcON1 = 0x87; You need to disable adc on PORTA to make the button work.
Figure 23-3 in the data sheet shows the key timing variables and the duty cycle itself is discussed in Section 23.3.5. Given Equation 23-3 and that you generally need to keep the PRx register value fixed, you should be able to derive the formula to convert the duty cycle into the required "CCPRxL:CCPxCON<5:4>" value and set the registers accordingl
HELLO i make one program in mikroc with 2 undlessloop one for pwm one for adc the program is blocked in 1st loop how can i correct this bug read two undlessloop at the end thanks a lot
I am using LTC1799 IC to generate a sys_clock signal of 1.83200 MHz for my project. In my project i have to use all channels of TIMER 1 and TIMER3 and TIMER0 to generate pwm cycles. Now i need to interface adc128s102 to my microcontroller. This adc runs on SPI protocol and my goal is to generate SCK with 20us period for reading the (...)
Hello! microcontroller only can creat digital signal,I don't think you can creat. Probably we don't use the same series. Most of those I know (MSP430, PIC, ARM...) have adc and some of them also have DACs. i have a doubt here, am using a microcontroller and want to generate 4 different frequency signal from a single chan
I have to read 8 adc channels. For this I selected simultaneous sampling of 4 channels. But I got the reading greater than the expected value for all channels. Almost 100 digit difference are observed. If I change to sequential sampling by selecting SIMSAM bit 0, I got the correct value. The adc settings are given below adcON1bits.A
Hello, Did you finish your project well? What is your system solenoid inductor value? and Did you test the shape of the current through solenoid? or the shape of the input of adc pin? Thank you
i wrote this code to control proportional solenoid valve with analog input 0-5 v . i made ramp by multiply the input signal by constant k to change the input signal slightly to the final value. but if the signal changed after running the program it can't go into the for loop so i put a condition while (r!=rold) // check if the input changed .but i
I need to change duty cycle with adc module. I wrote a program and it changes duty cycle with a warning ("adc conversion started before wait time has expired following previous conversion or channel change") in proteus. how can I fix this ? how can I add a subprogram for interrup? thanks for your help. here is my code: #
hello all, recently i am working on a project that is variable frequency drive. i have to control the speed of a single phase AC induction motor. inverter design which i am following in a full H-bridge circuit containing power mosfets. now i have to generate variable frequency pwm signles using MCU, for that purpose i am using pic18f4431. here is t
Hi everybody, I would to drive a solenoid with a mosfet and measuring the current by adding a 0.1 Ohm resistor between the source of the mosfet and the GND. (See the schematic below). When probing this point with a scope I see this signal (see scope capture below). What I would, is cleaning this signal before sending it to the adc for a correct r
I have succesfully done pwm and adc in the past 2 days and now wanted to do pwm interrupts. I have also successfully done external interrupts using INT0. I wrote the following code for pwm duty cycle control and doing A to D conversions within the pwm1 interrupt (this is just to test pwm (...)
Hey all, There should be (well with most BDC and BLDC motors) some sensor that relays the back-emf created by the windings back to the PIC. On the PIC, the line should go to a adc port which then checks it against a known (probably through trial and error) range of voltage-speed levels. I believe there is another way to calculate this. If you are