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Looking at the data sheet - it looks like that is programmable..
Look for info on the MCR ('Match Control Register')
Sorry if that s wrong or I mis-understood.. :(
designing a loadcell
Piezo material can be used for strain guage.
https://www.piezomaterials.com/
In general - the idea is, you have a 'springy' material - spring steel - that has piezo material adhered to - when the springy steel flexes - the piezo material reacts electrically (creates a...
The *only* 'work at home' deal I heard about was when some one started a small manufacturing biz in his garage - getting a small contract to build relatively simple circuits.
You may not consider that 'engineering' - but was in fact manufacturing engineering building electronic circuit boards...
Well, if you dont wish to give any clue into what you have in mind... heres some generic thoughts....
Think of it in terms of modules...
You have a Display (what kind would you like?, I recommend a serial driven one), a receipt printer, a cash drawer (spring loaded with a solinoid latch)...
led driver
LED drivers, usually will do 2 major functions...
regulate voltage/current properly from a wider supply voltage range - and PWM (pulse width modulate) the LED (flashing an LED 60hz @ 50% duty cycle = 1/2 the power consumption = 2x battery life (not exactly, but in general theory) but...
*sniff* *sniff*
Smells like molding home work to me :D
Msamples/s = Million Samples per Second - it is a 'speed' rating.
If I am sampling 70 Msamples/s;
1/ 70,000,000 = 1.42 x 10-8 time between samples.
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Other Q's... look here:
https://zone.ni.com/devzone/cda/tut/p/id/2709
led/lcd driver
well, google CMOS LXD DRIVER DATASHEET will find a lot of good info.
Otherwise you should spec which display.. Dot matrix, 4 Digit (like a DVM), 20 Character Serial ??
Consider using serial driven display modules, they are way simpler.
**broken link removed**
Easy - if they still are available...
Use 2 mercury tilt switches slightly off axis so that inertia in one direction will cause contact closure - and use 1 for each direction of travel- then OR them together. May need a Schmitt trigger
https://en.wikipedia.org/wiki/Schmitt_trigger
or use...
https://en.wikipedia.org/wiki/Ring_Indicator
So - its supposed to be an output of the modem - right?
If you are absolutely sure there is no activity on that pin..(??) .. its possible to use software.
That pin was designed to cause an interrupt on a PC (Phone is ringing...or for auto answer)...
mplab help forum
I would convert your number to BCD format..
BCD is good for this because it sort of extracts each individual digit - so you can easily convert each digit to ASCII or what ever.
There are different design rules for different kinds of circuits, and not just if analog or digital.
For instance - RF in digital circuits we usually want to avoid, but in radio circuits - we want to filter and amplify them.
And of course we can use RF for analog or digital transmissions, and...
build circuits and take measurements.
Put the knowledge gained from the books to real life use. Start with easier/smaller circuits, so to overwelm your self with the lessons gained from actual building.
A wise man told me before... "Engineers often design circuits that would never work in...
Thats the beauty with charged caps - the charging 'line' - doesnt need to endure large currents for even a short time (well - only the first instant power is applied to the caps - the current decreases over time, is the nature of capacitors) - we charge slow with low current - and discharge fast...
Read a voltage across the resistor, and convert with ohms law
I = V/R
So if the resistor is 10 Ohm and you read 2 Volts...
I = 2 / 10 = .2 Amps
A PIC is be able to measure such a voltage and do that math.
edit: You may need to use an ADC with a floating ground tho...?? /edit
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