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Messages - Battman_56

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Character LCDs / Re: NHD-0420D3Z-NSW-BBW-V3 back-light flickers
« on: April 15, 2015, 08:33:19 PM »
I’m having the identical problem as rickford66. I’m also using the NHD-0420D3Z-BBW-V3 and sending it data via the serial port at 9600 baud. He describes the issue perfectly as a “back-light” flicker. It appears to be random with the flashes occurring a couple of times per second to as long as 15 or so seconds apart. The length of the flash varies as well.

My first suspicion was a poor connection. I ran wires directly from the voltage regulator (SPX2940) to the LCD. No change. Used a battery to feed the regulator. Still no change.
Upon power up, my circuit displays a company name on the LCD and then goes into a holding pattern until a push button is pressed. No new commands are sent to the LCD until the button is pressed. The LCD does not flicker.

Pressing the button starts the main program which loops once per second. I’m not sending a “Clear Screen” command after each loop. The loop consists of reading several sensors and updating a couple of the values on the display. I've tried inserting a 5mS delay after every LCD command to ensure it had time to keep up. It made no difference.

I hope someone has a suggestion to solve my problem.

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