Okay ladies and gents, here’s a Chasing Light project using a single Shift Register (74HC595) and a TI Launchpad. (I’m currently following a line of research using the Shift Registers, but there is an easier way to do this with just a Launchpad alone.) It can be easily adapted for many uses. Examples include, but not limited to:
- Theatre Signs
- Airport Landing Strip
- Eat At Dave’s Signs
This particular Launchpad project uses an external device called a Shift Register. Simply put, it’s a device that remembers the 1 or 0 you just put into. If you put another 1 or 0 into it, it shifts all the existing saved 1’s and 0’s over one slot and adds your newest value in. It can hold 8 values, hence the term 8-bits.
Here’s what it looks like when its all put together on a breadboard:
Chasing Lights v1.0 from claymore1977 on Vimeo.
In between orders of Texas Instruments Launchpads evaluation boards from Mouser or Newark, don’t forget that TI has a free sample program that can get you a couple free MSP430 chips of varying models. Combine the raw chips with the ability to power and run MSP430’s off the red Launchpad board, and you can have quite the small army of animation and automation circtuis deployed on your layout in no time and very low cost!
Just please remember to keep TI interested in manufacturing the MSP430 processors by actually buying a few now and then. I think that if the hobby of model railroading can provide a significant enough demand for the MSP430 line of microprocessors, then we could help keep the prices low and increase the online support for the Launchpad based chips. Currently, there far more resources for the Arduino. Some of which can be ported to the Launchpad, some cannot.
I = E / R
Where E = Voltage(Volts), R = Resistance(Ω), and I = Current (Amps).
Ohm’s law can be re-written to solve for any of the parameters:
I = E / R Solved for Current
R = E / I Solved for Resistance
E = I * R Solved for Voltage
DC Real Power
P = I * E Used when you only have the Voltage and Current components
P = (E)2 / R Used when you only have the Voltage and Resistance components
P = I2 * R Used when you only have the Resistance and Current components