| ??? 04/06/06 10:40 Read: times |
#113710 - check the connection diagram Responding to: ???'s previous message |
Hi,
Thanks for the solutions which you've given.Here,i've connected BJT driver for the LCD backlight pins as follows: VL (Pin 3 of LCD)-variable end of trimpot Anode(pin 15 0f LCD)- One end of trimpot Transistor collector-other end of trimpot Transistor emitter-+5V Transistor base - 1K resistor (other end of 1K resistor to Port pin) 10K resistor between emitter and base. What happened is the backlight of the LCD is turned ON,but the characters are not getting displayed when the port is HIGH.Is there any paricular position in the code,where the port pin should be turned HIGH? Suggest the changes that are to be done in the program. Waiting for the reply, Thank you. |
| Topic | Author | Date |
| To turn OFF LCD backlight | 01/01/70 00:00 | |
| Not by code | 01/01/70 00:00 | |
| LCD backlight | 01/01/70 00:00 | |
| To turn OFF LCD backlight | 01/01/70 00:00 | |
| MOSFET | 01/01/70 00:00 | |
| check the connection diagram | 01/01/70 00:00 | |
| Are you confusing between contrast... | 01/01/70 00:00 | |
| Check my changes in connections | 01/01/70 00:00 | |
| In some models.. | 01/01/70 00:00 | |
| Voltage level at the backlight pins. | 01/01/70 00:00 | |
| Is cathode short to the ground pin? | 01/01/70 00:00 | |
| cathode is at 0V | 01/01/70 00:00 | |
| Did you check for short between | 01/01/70 00:00 | |
| problem in contrast | 01/01/70 00:00 | |
| See earlier PNP solution | 01/01/70 00:00 | |
| Thank you very much | 01/01/70 00:00 | |
using 5V for backlight? | 01/01/70 00:00 |