Almost there! I actually had 20 SMT 3906's that I got as a sample and it took no time to replace.

Unfortunately it appears I also blew the capacitor that is right below the transistor. Do you know what value that capacitor is supposed to be?

Thanks again!

Great. Thanks. Looks like all the SOT-23 3906's actually use the same pinout. That's a shock for SMT stuff.

Wish me luck. Well, maybe not too much luck, I need an excuse to get the new 20x4 White/Blue display. :-)

On 2002-09-30 14:00, Henry wrote:
If it's above the DB-9 Connector, then it's a RS232 Chip... Sipex SP232AEN.
Or the 2A PNP transistor, model 3906

The 3906 it is. I should've figured. I've used almost the same circuit myself. Doh.

Hmmm... Is the 2A a brand? Searching for 2A PNP 3906 of course ...

I screwed up while connecting up some stuff and after a dismal morning debugging, I think I only blew up one component on the LCD backpack.

Unfortunately it's blown to such a degree that I can't read the frigging part number. Argh! So right now I'm dead in the water. If somebody else (or MO) can ...

Yep. When the lockup occurs stop/starting doesn't help. I've tried all sorts of things with no luck.

On 2002-06-24 01:14, ravton wrote:
This is part 2 of my saga of using a brand new BLK 202A-WB with i2c. While waiting for the resolution of the keypad issue (in another post) I wrote a quick program to basically blast text to the LCD.

I'm running the i2c bus at 100khz (what khz does the lcd run ...

I finally found something that returns the correct keycodes. I changed my i2c routines from a bit-banging library to hardware-based. Once I then lowered the hardware bitrate to under 100kbps (which is where it was before) the keys seem to be coming through okay. The lower bitrate doesn't hurt my ...

This is part 2 of my saga of using a brand new BLK 202A-WB with i2c. While waiting for the resolution of the keypad issue (in another post) I wrote a quick program to basically blast text to the LCD.

I'm running the i2c bus at 100khz (what khz does the lcd run at? The manual never says). When I ...

Bummer. I really hoped I wasn't doing some setup that I needed to do.

Please keep me informed. I bought this display due to perceived ease with the i2c interface, and the more time I lose the less attractive it is. :-(

Sorry, I meant to add that to my post. It works perfectly with RS232, with the device returning values in the published range ('A' on up).

I do get 0 back when no keys have been pressed.

This is hooked up to an AVR ATMEGA163 microcontroller. The code is pretty basic:
if(i2c_start()) { //make ...

I'm having some trouble using the BLK 202A-WB with my embedded design over i2c. The LCD display itself seems to work great, but the keypad isn't working as expected. I've tried many different things now and have had limited success. The documention is very poor on the i2c interface interaction ...

Ok, I have a VK204-25. For my first exercise I'm trying to figure out how to set the startup screen (the default text that is displayed when the unit starts).

Unfortunately the only place I can find those commands are for other units, and those command don't seem to work. So how about it, does the ...