Databases
Yahoo database tables
These records come from the Yahoo Groups databases export preserved for this archive.
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CVS FAQ
· 19 records · 3 columns · Owner djbrow54 · Updated 2010-10-11
CVS Module and PCB information
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LCD_Support FAQ
· 12 records · 3 columns · Owner djbrow54 · Updated 2008-02-03
LCD_Support Module and PCB Information
Database table
LCD_Support FAQ
LCD_Support Module and PCB Information
12 records · Owner djbrow54 · Created 2007-09-06 · Updated 2008-02-03
| Record | Tip | Description | Author |
|---|---|---|---|
| 1 | J6 installation | The 2x3 pin J6 connector is only used for in-circuit programming of the AVR processor and is not installed. | Dave Brown |
| 2 | J1 / J7 installation | Remember that J1 and J7 are on the solder side (back) since the PCB mates on the back of the LCD module. | Dave Brown |
| 3 | LCD pinout compatibility (important) | The original PCB was designed with J7-1=ground and J7-2=5 volts. Currently available LCD modules have these two pins reversed. You need to verify the pinout of the LCD module and verify compatibility with the LCD_Support PCB. Swapping these pins requires cutting and jumpering traces. This is described in the BOM. PCB revision A00 swaps these two pins for LCD compatibility. | Dave Brown |
| 4 | Contrast adjustment | The contrast control works over the very end of the range. A power up message will be displayed (unless it has been reprogrammed for a blank screen). Adjust the contrast control if no message is displayed. | Dave Brown |
| 5 | +5 or +15 power supply configuration | This module can be powered from either +5 volts or +15 volts with regulator U1. If powered by +15 volts, a 4 pin MTA connector may be used, L1 not installed, and J3 replaced with a wire jumper. If +5 volts is used, C1 and U1 should not be installed or jumper J3 removed. For maximum flexibility, all components may be installed but be sure to remove jumper J3 if +5 volts is applied to J2. I purchase a 2 pin MTA connector and install over the +5 volt / ground pins so it is obvious where to plug a 4 pin cable. | Dave Brown |
| 6 | Backlight current | The value of R2 may be chosen to vary the backlight brightness. A higher value resistor will lower the brightness and current to reduce power dissipation of U1 if powered from a +15 volt supply. Here are some values of R2 vs. current: 15R=89 mA, 24R=63 mA, 27R=57 mA, 30R=54 mA, 39R=35 mA, 47R=30 mA, none=12 mA. At the higher resistances you do not need a heat sink. | Dave Brown |
| 7 | LED1 / R6 | LED1 will blink for each byte of MIDI data that is passed through the LCD_Support module. MIDI sysex commands to control the display are not sent to MIDI out and will not blink the LED. R6 should be chosen for the appropriate brightness. Maximum current allowed is 10 mA. | Dave Brown |
| 8 | PSIM configuration | To use this display with a PSIM, wire J5-1 to PSIM J5-4, J5-2 to PSIM J10-1, J5-3 to PSIM J5-2, J5-6 to PSIM J5-1. Wire J5-4 and J5-5 to the MIDI out connector if used. A schematic is in the LCD-support folder. | Dave Brown |
| 9 | Stand alone MIDI monitor configuration | The LCD_Support module can operate as a stand-alone MIDI monitor displaying hex data. Wire J5-3 to J5-6 and ground pin 9 of U3. MIDI data received will be displayed in a scrolling format. A schematic is in the LCD-support folder | Dave Brown |
| 10 | MIDI in / out configuration | This PCB supports MIDI input and output for the CVS. If this capability is not needed, do not install R1, R3, R4, R5, R6, D1, U2, and J4. | Dave Brown |
| 11 | Software guide | A complete software guide is in the LCD-support folder. This describes all operations and also how to reprogram the default power-on message. | Dave Brown |
| 12 | Assembled views | There are two photos of an assembled module. "LCD Support PCB Side" in the Photo Albums > LCD Support PCB folder and "CVS LCD assembly" in the Photo Albums > Dave Brown folder. | Dave Brown |