The Learning Circuit 44: Switches: Poles, Throws & Relays

First identify the lcd you want to use and find alibrary for your MCU plattform:

1. decide on Plattform (Arduino/Raspberry pi fors example)

2. search for a display library for that Plattform (Adafruit has tons)
3. identify supported Screens in that Library

4. go to Farnell.com / newark.com / element14.com and enter the lcds part number.

5. Order your parts

6. learn from the example code provided with the library.

for example the Liquidcrystal library for arduino support HD44780 compatible displays.

can you please suggest where can i can code for lcd ?

Depending on how you hook it up, yes I believe that would work fine.

hello mam,

i wanted to make tail light indicator (turn signal) for a cycle using 16*2 lcd and arduino can you please suggest me which switch can I use ?? I think  SPDT (ON-OFF-ON) type will be feasible; means  if i turn to the left side it will pass signal to arduino and it will display left signal like (<<<------) in blinking manner and if i make it in a neutral position it will show nothing and when i turn it to right side it will show right signal (---->>>>) can these be possible ?and for lcd to make two different figures using ASCII values will it works and where can i get code for lcd ??

it would be really helpful if you reply to my question ...

THANK YOU SO MUCH

From what I can tell that seems like a very specific, and proprietary switch. It looks like pins 4&5, and 6&7 are tied to each other when the switch is off, and Pins 1,2,3, 8, 9 are all tied together when it's on. You're not going to find a switch that does exactly that.
You could potentially create a new one from scratch, but I don't think you're going to find a switch exactly like the original that you can straight swap in.

Hello to all and anyone that can please help =)

My name is Frank and I was wondering if anyone would be kind and take some of your time to help me identify and find a replacement switch used in a japanese automobile built in the 70's.  Replacement and recondition parts for these vehicles are becoming unaffordable to the public and some sellers on Ebay are asking up to $600.00 for the parts.

All information on how the switch works can be found on this link under "how the hazard switch works" and a picture can also be found under figure #1 about the terminals it uses.

http://woodworkerb.com/home/datsun-240z-rebuild/datsun-240z-multifunction-switches/

My goal is to find and buy a switch online  that does the same function and can be wired in the same way to exchange the original hazard switch out for the more afforadable switch,  if possible.

I also plan to create a very simple video on YouTube and post the information on an existing car blog.

Thank you all in advance for your time and effort.

God bless

Thanks for sharing the extra info, John!

Very good episode Karen.

In the old days, we had to hand clean relay contacts when they became covered in carbon due to the sparking of voltage and current in heavy use.

The newer relays are much less prone to that kind of problems.

DAB

Hi Karen,

Great presentation on switches.Some switches have an internal light which can add some extra confusion to the purpose of the connection pins. If a data sheet isn't available it is sometimes possible to see where the wires from the light are attached to the pins. The inclusion of a light may restrict the voltage that can be used with the switch to the voltage range that the light will need to function. While it is trivial, a couple of switch types that were not mentioned are the normally open and normally closed momentary switches which play a very dominant role in our technology.

John

Karen, Relay coils DO NOT REPEL the actuator, they either Attract, or Release the actuator. a Spring returns the actuator the "Normal" position (as in Normally Open/Closed as opposed to the abnormal or energised position)