Important changes to forums and questions
All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.
11 years, 9 months ago.
interfacing lcd
i am interfacing lcd JHD162A with my mbed board.....but i am not getting data displayed on LCD..........
JHD162A has a KS0066 controller.......
and the program https://mbed.org/cookbook/Text-LCD
is a hitachi 4470 controller.......
so for both controllers has a same commands.....please help...
3 Answers
11 years, 9 months ago.
Pin-5 (R/W) has to be connected to GND.
Accepted Answer
11 years, 9 months ago.
Could pins 2 & 3 be swapped?
poster
11 years, 9 months ago.
but pin 2-for vee
pin 3-for vcc
not getting
Please provide the schematic showing connections between mbed and the display. What is powersupply voltage for display, what is LCD contrast voltage.
posted by Wim Huiskamp 01 Feb 2013pin 1 should be GND
pin 2 should be 5V
pin 3 should be Vee (wiper of potmeter, other ends GND and 5V)
pin 5 should be GND (R/W)
Rest of wiring seems OK
posted by Wim Huiskamp 01 Feb 2013I have wired as u stated above but not getting displayed....
posted by karunakar praveen 02 Feb 2013Have you tried adjusting the potmeter. Vee should usually be close to 0V. The display should show the top row as black blocks. That row will show right after a reset even without running software. Try the display with only powersupply and vee connected. When you dont see this black row your wiring/voltages are wrong or the display is broken because you had powersupply connected in the wrong way at first.
posted by Wim Huiskamp 02 Feb 2013finally it got displayed on lcd :) .....my lcd was not working,i bought a new one ...thank you sir for your support
posted by karunakar praveen 02 Feb 2013