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Re: RETW in PIC
The instruction is RETLW is mostly used when doing look-up tables in PIC assembly. You call the table address with CALL instruction, at the table address you place an instruction that adds an offset to the PCL to get the correct RETLW from the table and return with that value in...
For stall detection, it seems that few miliseconds delay will not harm. This makes it easy to use the shunt resistor follwed by a low pass filter to get the average value of the current. If you PWM frequency is high enough, the filter time constant could be made small giving the least possible...
Re: Optocoupler
you may use the output of the optocoupler to drive a power transistor or MOSFET to switch the high voltage but the optocoupler are not intended for power switcihng, only for low level signals.
Good luck
Re: signal from sensor
The problem of low mV output sensors is the power frequency noise (50 or 60 Hz). you should use a low pass filter after your amplifier and don't negelct decoupling capacitors on all IC even analog ones. The analog ground should be isolated from the digital ground if...
MATLAB has a serial port object that you can use to output data to your PC's serial port. You may then use a microcntroller to receive the data and output it to a port to be fed to a DAC like the DAC0808
Good luck
dc current & dc voltage meter using 7107
Will you build the meter from scratch with a microcontroller or so or what? Or you intend to use dedicated chips?
The subject is interesting. You will need to use an ADC to measure the generator output voltage. If your microcontroller doesn't have one, I think the ADC0804 will do. Then you will need to do simple discreete PI or PID controller in software. Depending on your method of controlling the field...
I my self working on a simple project that needs primary DSP knowledge. I think it may fit you. I'm working on a DTMF decoder using a micrcontroller. The microcontroller is aimed to decode the DTMF signals and control some home appliances accordingly. You may find great deal info about the...
Re: How can I do
Since you sensor gives a bipolar output, you will have to use either a bipolar input ADC or do some signal conditioning. In your case you will have divide the sensore output by 2 then add +2.5V offset to it. a simple Op-Amp adder circuit will do the job. Look at the Art of...
if you want the ADC to make continous conversion, you should tie the EOC (end of conversion) pin to the SC (Start conversion) pin of the ADC otherwise you should give the SC signal every time from your microcontroller. However, the SC signal must be provided for the first time only.
Good luck
phase control using microcontroller
Controlling AC power with a triac is called phase control. If you intend to control power delivered to the lamp wit a triac, you should trigger the triac at a certain point in the AC cycle that gives you the required RMS voltage output. PWM can be used if you...
Re: USB and 8051.
perhaps you should try one of Cypress's EZ-USB 8051 microcntrollers, they are deigned for USB applications. Or you may use a USB to UART converter such that of FTDI. CYpress has a wide range of micrcontrolers that support USB but they are not 8051 compatible. Also Microchip...
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