3 volts lcd displays

Roberto Pachi · 20th January 2007, 09:25

Hello Jmurba,
I don't know if you solved the logic levels problem yet and have not enough time to read all the posts of this thread, so I'll give you my two cents.

If your processor is able to understand a logic input level of 3V (same if it was 5V, as lot of MCUs), you can power supply the 3V sensor via a voltage reference Zener diode and couple the signals coming from the processor via a 74LCX04 component. The 74LCX04 has six internal inverters with 5V tolerant inputs; this way the MCU understand the signals coming from the sensor and the sensor can receive the level translated signals from the MCU.

Hope this help

Roberto

***jradomski*** · 20th January 2007, 10:33

Quote: (Originally Posted by Roberto Pachi)

Hello Jmurba,
I don't know if you solved the logic levels problem yet and have not enough time to read all the posts of this thread, so I'll give you my two cents.

If your processor is able to understand a logic input level of 3V (same if it was 5V, as lot of MCUs), you can power supply the 3V sensor via a voltage reference Zener diode and couple the signals coming from the processor via a 74LCX04 component. The 74LCX04 has six internal inverters with 5V tolerant inputs; this way the MCU understand the signals coming from the sensor and the sensor can receive the level translated signals from the MCU.

Hope this help

Roberto

BTW he said he was using a PIC.. Most pics have their logic levels based on Vdd, but some pics have TTL level compatible ports which would work be able to determine the proper logic from a 3v device since they use a 2v threshold for a high..

**jmurba** · 21st January 2007, 09:20

Quote: (Originally Posted by jradomski)

BTW he said he was using a PIC.. Most pics have their logic levels based on Vdd, but some pics have TTL level compatible ports which would work be able to determine the proper logic from a 3v device since they use a 2v threshold for a high..

thanks a lot to all for your help
I'l let you know the result of my testings based on your comments

all the best

jean michel

aren · 15th February 2007, 16:35

Hello!
This is my first post

))

Ok, 3 V Displays:
ELECTRONIC ASSEMBLY (sorry, is in german)
works with 3 - 3.3 V, SPI or parallel (1x8, 2x16, or 3x16)
(the are between 12-18 € as far as I know)

or the DIP series where some work with 3V (the 4x20 also spi and parallel)

Best regards from Italy

**jmurba** · 16th February 2007, 21:45

Quote: (Originally Posted by aren)

Hello!
This is my first post

))

Ok, 3 V Displays:
ELECTRONIC ASSEMBLY (sorry, is in german)
works with 3 - 3.3 V, SPI or parallel (1x8, 2x16, or 3x16)
(the are between 12-18 € as far as I know)

or the DIP series where some work with 3V (the 4x20 also spi and parallel)

Best regards from Italy

thanks a lot,
I will se google to read this site (((-:

20th January 2007, 09:25	#31 (permalink)
Roberto Pachi New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2006 Location: Italy Posts: 1	Re: 3 volts lcd displays Hello Jmurba, I don't know if you solved the logic levels problem yet and have not enough time to read all the posts of this thread, so I'll give you my two cents. If your processor is able to understand a logic input level of 3V (same if it was 5V, as lot of MCUs), you can power supply the 3V sensor via a voltage reference Zener diode and couple the signals coming from the processor via a 74LCX04 component. The 74LCX04 has six internal inverters with 5V tolerant inputs; this way the MCU understand the signals coming from the sensor and the sensor can receive the level translated signals from the MCU. Hope this help Roberto
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20th January 2007, 10:33	#32 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,115	Re: 3 volts lcd displays Quote: (Originally Posted by Roberto Pachi) Hello Jmurba, I don't know if you solved the logic levels problem yet and have not enough time to read all the posts of this thread, so I'll give you my two cents. If your processor is able to understand a logic input level of 3V (same if it was 5V, as lot of MCUs), you can power supply the 3V sensor via a voltage reference Zener diode and couple the signals coming from the processor via a 74LCX04 component. The 74LCX04 has six internal inverters with 5V tolerant inputs; this way the MCU understand the signals coming from the sensor and the sensor can receive the level translated signals from the MCU. Hope this help Roberto BTW he said he was using a PIC.. Most pics have their logic levels based on Vdd, but some pics have TTL level compatible ports which would work be able to determine the proper logic from a 3v device since they use a 2v threshold for a high.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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21st January 2007, 09:20	#33 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 925	Re: 3 volts lcd displays Quote: (Originally Posted by jradomski) BTW he said he was using a PIC.. Most pics have their logic levels based on Vdd, but some pics have TTL level compatible ports which would work be able to determine the proper logic from a 3v device since they use a 2v threshold for a high.. thanks a lot to all for your help I'l let you know the result of my testings based on your comments all the best jean michel
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15th February 2007, 16:35	#34 (permalink)
aren New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Aug 2006 Posts: 6	Re: 3 volts lcd displays Hello! This is my first post )) Ok, 3 V Displays: ELECTRONIC ASSEMBLY (sorry, is in german) works with 3 - 3.3 V, SPI or parallel (1x8, 2x16, or 3x16) (the are between 12-18 € as far as I know) or the DIP series where some work with 3V (the 4x20 also spi and parallel) Best regards from Italy
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16th February 2007, 21:45	#35 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 925	Re: 3 volts lcd displays Quote: (Originally Posted by aren) Hello! This is my first post )) Ok, 3 V Displays: ELECTRONIC ASSEMBLY (sorry, is in german) works with 3 - 3.3 V, SPI or parallel (1x8, 2x16, or 3x16) (the are between 12-18 € as far as I know) or the DIP series where some work with 3V (the 4x20 also spi and parallel) Best regards from Italy thanks a lot, I will se google to read this site (((-: __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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