/diy/ - Do It Yourself

>>128446
How about a whole bunch of door hinges bolted together into a long chain. The bolts would hold them together and be the tread knobs.

Its called an RC snubber network.

>>128002
I'm an electronics engineer. I came into contact with a pair of designers who wanted to do cool stuff with electronics but didn't really know how. They handled the business work. This project was a contract we won from a city public art board.

>>127983
My most recent project:

Thirty lights strung under an elevated train track. Each light is solar powered, contains sound and motion sensors, and uses 100 individually addressable RGB LEDs. When a person goes by underneath or a train goes by above they pulse patterns in response and as a group form a wave. Trains and people trigger different patterns.

Total budget: $70,000

>>127874
You mean that all you've done is connect the pgc, pgd, mclr, vcc, and gnd lines from a programmer to the PIC?

If your microcontroller has an internal oscillator and is configured to use it and the programmer has the ability to pull mclr high and is doing so your program will run. Otherwise you need to add an oscillator and pullup resistor to mclr.

>>127838 variables do I call in my codes to access the keypad/lcd

The C compiler should define the standard printf scand, putchar, and getchar. Also some functions for setting up RS232.

>>127838
Yes. When you are setting up a new project it will ask you what compiler it should use; pick a C one.

You want the tx line of the device connected to the microcontroller's rx line, and the rx line of the device connected to the microcontroller's tx line. On your microcontroller pins 26 and 25 are for rx and tx respectively. You may need to set some registers to enable them for tx/rx functionality, consult the datasheet.

With RS232 you need to make sure both devices are using the same Baud, parity, databits, and stop bit. Check the datasheet for the device for this information. Its usually given in the form "9600-8-N-1". Configure your microcontroller to use these settings; consult the datasheet to see how.

>>127767
OP's original picture had no resistor at all; so we can safely assume that no matter how small the resistor is the transistor will not allow too much power through.

Put LEDs in them and control the LEDs with a microcontroller. If you're ever not sure what to do with something put an LED in it.

>>127723
Be warned I pulled the resistor values out of my ass. You want them increasing at a constant interval, but 1k,2k,3k,4k may not be best. If the resistors are too big the topmost LEDs will never light up. If they are too small even a quite sound will make them all turn on.

Your solder looks grey and rough. It should be shiny and smooth or you're doing something wrong. Also you don't need that much uninsulated wire there.

My method:
Tin the wire and the connector with solder then hold them together and reheat the solder on each of them together. Holding a piece of solder wire, iron, and the components with two hands is clumsy.

>>127678
If you do this the LEDs in parallel will burn out when the transistor outputs enough power to run the LEDs in series, and also the LEDs in series will not light up. Also connecting LEDs in parallel like that without load balancing resistors is never a good idea.

There are some chips designed for this sort of application like the LM3915. However if you want to do something simpler without a dedicated chip Pic related.