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Posts posted by gramo
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Double posting doesn
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Re-phrased;
I would not recommend this project to new comers because it puts your hardware at risk.
Do not modify your program unless you are prepared to buy new components.
Double check you -
I am coming from a beginners perspective. Someone who is learning electronics.
Reading and following the examples, and having many of the components already in place is brilliant. They introduce the use of breadboards, circuit wiring, and general electronics in a safe constructed manner. There -
I'm having a hard time filtering my way through the net, and im no guru with op-amps, maybe someone could help me out,
I'm looking for a dual supply (+-12V max) rail to rail opamp, that -
I think they are great, work through the work books that come with them. I still have my first "electronics learning lab" :)
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If the PIC were to fail due to some modified programming that went wrong, or a simple wiring error such as MCLR not being tied to 5V, the user would fry thier PIC :-\
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Considering this is your first post, and the product looks dodgy as hell, I wouldn
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audioguru's comments made plenty of sense to me, reading over the last few threads.
25mA is the absolute maximum current rating from a PIC, exceeding this will lead to putting the device under conditions that will deteriorate its life span.
Pulsed or constant, absolute is absolute -
Are there many differences between these two compilers, i.e. is one better than the other? I'm open to any suggestions :)
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The accuracy will depend on where you set it - use a multimeter and wind too exactly where you want it, be sure to test the output without the screwdriver on the pot as the downward force may alter its normal reading.
The input impedance shouldn -
Except dont use 10K pots, as the total input impedance shouldnt be more than 2.5K for accurate ADC conversions. A 2K pot would be suffice;
http://www.futurlec.com.au/test13.jsp?category=POTRECT&category_title=Rectangular%20Potentiometers&main_menu=POTENTIOMETERS&sub_menu=POTRECT -
Why not use a Pot? You could set a reference voltage quite easily, and you should already have a rather stable power supply for your PIC
Wind the POT's to the required resistance and check them with a multimeter and your set.
If for some reason your voltage regulator decides to conduct harder/less than the voltage Vref (the reference for your ADC conversions) on your PIC is also going to be affected proportionally.
Eg; Vout from reg rises too 5.2 Volts, therefore the output of the potentiometers will rise by 0.2V but so too will what ever Pin (probably Vcc) you have as a reference for the ADC conversions, so your PIC will still read 2.26 or 3.673 volts (well the analogue equivalent), as its a digital representation of Vref -
Done and Done.
I don -
Not for the flow meter itself, but for the application
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What the Max Gallons per second?
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I'll throw something together with a PIC
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Are micro controllers an option for you?
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Proteus is unbelievable, supports PCB auto placement and routing (the auto routing tool is a shear dream, and can be configured too auto route in different ways)
ISIS(part of Proteus) allows you too build the circuit and test your PIC/AVR/other programmable device in near real time in a complete virtual sim environment, you can throw in virtual instruments from DC volt meters to oscilloscopes too Virtual Terminals To test your circuit/design.
Then Click "Ares" and choose the PCB packages for the components you have used, click auto place and auto route - done! -
Would a chopper circuit from a L298 provide protection from stall current draw?
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Are you familiar with PIC's and PICBasic?
Need to build a computer controled keyboard
in Electronic Projects Design/Ideas
Posted
Having 31 spare Pins is a big call for most micro controllers, I did make something similar that can be found here
http://users.tpg.com.au/gramo/Site/computer_keyboard.htm
Might give you some ideas?