How do I......

Motoman · Post by **Motoman** » Wed May 25, 2005 3:27 pm

Hook up LED's to my TI-83+ calc?

daguuy · Post by **daguuy** » Wed May 25, 2005 4:34 pm

the following walk through is a guess and not been attempted yet
1. remove front cover
2. put LEDs in the corners of the screen
3. use some kind of 3v voltage regulator or resistor or whatever to make 6v 3v so it will work with LEDs
4. connect the 3v to the LEDs
5. connect the 6v to the batteries
6. put cover back on
disclaimer: any damage to the caculator or you is not my fault. you are doing it at your own risk

nos_slived · Post by **nos_slived** » Wed May 25, 2005 6:23 pm

I might actually try this, because I find it really hard to see sometimes. Let us know how it works out when you do this.

HK-47 · Post by **HK-47** » Wed May 25, 2005 6:35 pm

Adapt.
http://richfiles.solarbotics.net/Backlight.html
http://michaelv.org/calc_mods.php#el86

Motoman · Post by **Motoman** » Wed May 25, 2005 6:48 pm

I think i'm just going to add an external 3v because for some reason my batteries seem to drain really fast. (Maybe i'm just playing to much Pheonix during algebra

) I'l probably also put in an on-off switch.

O yey my radioshack finally got some LED's in stock! (better get some)

nos_slived · Post by **nos_slived** » Wed May 25, 2005 7:09 pm

I usually test my batteries when I change them, and I have found every time that the first battery is 0.3V, and the rest are still 1.5V.

The batteries that came with it lasted for about 8 months, and since then they last like a month.

soundwave · Post by **soundwave** » Wed May 25, 2005 7:14 pm

I'd consider doing that second one, with the EL panel, I love blue backlights.

*o* · Post by ***o*** » Wed May 25, 2005 7:34 pm

i want to add a few to my bike computer because it ride a lot at nihgt

cennar · Post by **cennar** » Wed May 25, 2005 9:24 pm

this is the kind of thing i was talking about when i said i was going to back lit a GBC or GBo

*o* · Post by ***o*** » Thu May 26, 2005 1:31 am

i am going to do this on my crappy little casio

*o* · Post by ***o*** » Thu May 26, 2005 4:22 am

ok my calculator has 1 AA battery and i need to know how to run 4 of these led's off it http://www.dse.com.au/cgi-bin/dse.store ... View/Z3019

vb_master · Post by **vb_master** » Thu May 26, 2005 6:13 pm

I was just about to point to the Richfiles!

*o* · Post by ***o*** » Thu May 26, 2005 10:45 pm

please tell me how i tried hooking them directly up to the battery but nothing happens short is negative right?

nos_slived · Post by **nos_slived** » Thu May 26, 2005 10:50 pm

1.5V may not be enough to power the LEDs. I can't find the LEDs on the pae, it is all just ads. Post some specs if you can.

*o* · Post by ***o*** » Fri May 27, 2005 1:52 am

Electrical ratings - Red = 2.1V @ 20mA, Green = 2.2V @ 20mA, Yellow = 2.2V @ 20mA and Orange = 2V @ 20mA.

it doesnt matter which i use i have tonns so i can go through them

ne way i want to add a windo in the back so ill have the pimpiest calculator ever on my new show "pimp my claculator" woo

i want to rig the leds up to the 5 button so i annoy my math teacher