I recently aquited a 16x2 KS0066U KS0065B lcd w/ blacklight
Searching around i found the schematic id like to use (as it uses lcd smartie to turn on/off the backlight)
What i need to know is a partslist (what diodes to use, what transistors etc) for this. Im by no means electrically proficient but i know my way around a soldering iron and can (hopefully) have it all wired up within the day as long as i have the parts.
scematic
also, will that work w/ a 16x2 display?
are they any other schematics i should be using (and if so, what parts do i need besides the parallel cable)
an answer soon would be helpful as im heading to work in a couple hours and by the time i get back all the stores
Our new official repo is on github
LCD Smartie version 5.6 is released!
Download it now: https://github.com/LCD-Smartie/LCDSmartie/releases
LCD Smartie version 5.6 is released!
Download it now: https://github.com/LCD-Smartie/LCDSmartie/releases
Newbie needs help (dont we all)
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mattcro
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Here's the official Smartie schematic, but your schematic has the same wiring.
If you're buying parts from an electronics store, use the part numbers on the schematic for the diode (1N4148) and transistor (BD135). For a small LCD like 16x2, these do not have to be the exact same type. Just about any general purpose NPN small signal transistor will work - make sure it has a collector current rating of at least 100mA for a 16x2 LCD (I used a BC548C). Any silicon diode will work - 1N4001 is a common type. You don't really need the diode, just leave it out and connect the parallel port pin to the resistor.
Your schematic has a 150 ohm resistor shown, but I reckon this is a rather low resistance - Smartie's schematic has a 1000 ohm resistor which is more reaslistic. This resistor can be an ordinary small 0.25 watt type.
The potentiometer marked 10k ohm can be any small "preset" or "trimmer" type. You can also use an ordinary volume-control type with a control knob.
The 100ohm potentiometer sets the brightness of the backlight. It needs to be a larger volume control style potentiometer (variable resistor) since there's a fair bit of current going through it and a small preset style potentiometer might get too warm.
Sorry I can't give exact stock numbers - it really depends which store you're buying from and I don't keep tabs on all the stock codes.
If you're buying parts from an electronics store, use the part numbers on the schematic for the diode (1N4148) and transistor (BD135). For a small LCD like 16x2, these do not have to be the exact same type. Just about any general purpose NPN small signal transistor will work - make sure it has a collector current rating of at least 100mA for a 16x2 LCD (I used a BC548C). Any silicon diode will work - 1N4001 is a common type. You don't really need the diode, just leave it out and connect the parallel port pin to the resistor.
Your schematic has a 150 ohm resistor shown, but I reckon this is a rather low resistance - Smartie's schematic has a 1000 ohm resistor which is more reaslistic. This resistor can be an ordinary small 0.25 watt type.
The potentiometer marked 10k ohm can be any small "preset" or "trimmer" type. You can also use an ordinary volume-control type with a control knob.
The 100ohm potentiometer sets the brightness of the backlight. It needs to be a larger volume control style potentiometer (variable resistor) since there's a fair bit of current going through it and a small preset style potentiometer might get too warm.
Sorry I can't give exact stock numbers - it really depends which store you're buying from and I don't keep tabs on all the stock codes.