From: "Keelan Lightfoot" > also, http://www.matrix-orbital.com -- really neat modules from these people > -- VFD or LCD... While we're on the subject of LCDs, I'm in the early stages of designing a data acquisition/telemetry system using a 16F877. The prototype is breadboarded and ready to load and I've written and simulated the main loop and A/D business and started on the LCD code (using MPLAB. We'll also be using MPIDE, but I haven't got that far yet.). Since the company hasn't decided what size/type of LCD to use yet I've dug out a module from the oddments box to use on the proof-of-concept prototype and this is where the problem begins. It's a Hitachi LM213XB and I can't find any info on it anywhere. The Hitachi site drew a blank as did several search engines. The data that came with it is just the HD61830 data sheet and the pinout. It's 40x8 in character mode apparently but there's no info on what the duty cycle needs to be nor what RAM and/or ROM is on the board nor the size in graphics mode. For the prototype I'll be using character mode to display raw figures but the production model needs something pretty. I'd like to display the data (5 channels, 4 fairly fixed DC levels and one audio checked for peak level) as horizontal bar graphs with the numeric value inset. Is it optimistic to try achieve this in real-ish time with an 877? I can get a reasonable budget for the display so it'd be good to have a nice graphic feel. Anyone have recommendations for LCD modules that might be suitable for the production model? Veering sharply back on-topic, I should add this is my first 877 project and my first really major PIC coding exercise having only done fairly simple applications so far, so if anyone has any hints please speak up. Any warning of unexpected things to look out for when A/D, Rs232/485 and LCDs are being used together would be welcome too. Andy Howard England, bottom-right corner. music@soon.com .