I’ve just assembled a K8095 kit. As Conrad(.fr) doesn’t sell anymore the official LCD display option, I get another (very big) LCD display and make my own adapter.
I used a “LCD Anag Vision AV1621YRB-SJ” with the following mapping :
J10 -> LCD
1->1
2->2
3->3
4->4
5->5
6->6
7->11
8->12
9->13
10->14
I successfully wire all wires on LCD display except A & K for display’s LED. I found 9.6v on A&K on J10.
Note : LD4 power led indicator is soldered
The LCD need for LED is :
LED Forward Voltage Vf 25 °C - - - Typical : 4.2 / Max : 4.6 V
LED Forward Current If 25 °C - - - Typical : 260 / Max : 420 mA
LED weiß (white in german?) Voltage* ILED 3.5 V Min : 50 / Typical : 60 / Max : 75 mA
Can I found correct current somewhere on the K8095 PCB ?
My YouTube timelapse :
[youtube]uXTgYTY9AzE[/youtube]
[quote]Is it normal that I have 9.6V between pin LED_A & LED_K of J10 connector (and not 12v) ?[/quote]This is OK. The rest of the voltage is left over the transistor T1 and resistor R9.
[quote]In case of 9.6v, a 22 ohms resistor in serial on Anode will be fine ?
In case of 12v, a 32 ohms resistor in serial on Anode will be fine ?[/quote]There is no need for additional resistor. Transistor T1 (togethrt with R9) limits the LED current to about 26mA.
Thanks, I had no light with a direct connection (I tried after some tests with a standard green LED).
What is the current needed of my display 260mA (Ic) or 60mA (iled) ? Maybe my LCD display needs too much power…
Indeed, maybe the current is too low. Have you measured the backlight LED current?
You may also test the backlight with adjustable power supply and a series resistor…
I’ve got a solution for the first LCD : no lighting !
I’ve buy a second K8095 kit and another LCD display (with light).
But LCD display only half of the screen. In fact the 8 characters on the left and on the 2 lines have a very low contrast.
I switch displays of the 2 kits . . . and now the 2 kits display half of the characters.
I thinking frying the LCD display with a incorrect connection but a test with an Arduino show characters on the full display even if left part is a little bit dimmer.
On the LCD slot (with LCD plug in), I have 4.68V between pin 0 and 1. (4.96v before the D1 diode)
On the LCD slot (without LCD), I have 7.60V between pin 0 and 1.
On the LCD slot, I have 0.04mV between pin 0 and 2 (contrast if full).
3.29v between GND and VDD
3.29v between GND and VPP
First display (the one that was on previous post) : on arduino = full display
First display (the one that was on previous post) : on both K8095 = half display
Second display (the new one) : on both K8095 = half display
Second display (the new one) : on arduino = full display
OK
Normally the K8095 should work with any standard 16x2 display having Hitachi compatible LCD controller.
Here seems to be a picture of one such example: quasarelectronics.co.uk/Ite … player-kit
