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    28X2 on 3Vdc

    Hi all, just started playing with my new (version A) 3Vdc 28X2. I was thinking of making a datalogger out of it, then thought how does running on 3V affect ADC? Can I still interface this low voltage beastie to a PC style keyboard? or a DS18B20? Do I need to do level translations? Any...
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    Pins and Bits

    Hi everyone and seasons greetings. For some time now, I have been working on a project to use a Nokia 3310 LCD as a serial display, much like the Rev Ed kit but with more lines/graphics? It's all working okay, but I feel the need for a bit more speed. I'm using an 18M2 and some reworked...
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    I2C again?!

    I love the i2c bus, can you tell? Currently, I'm trying to use an 'old' memory eeprom, a 24C04, as a character map for driving a Nokia 3310 display. I have the eeprom programed a la westaust55 - many thanks for your info. My 'problem' is that the 24C04 appears as two devices on the bus, $A0...
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    Interupts

    Hi all . I have a project I'm having some challeges with. I have a multiplexed LED display which I've figured out how to drive by reading threads here, thank you! I now wish to read temperature from a DS18B20 and display on the LEDs. Problem - the display multiplexing is driven continuously by...
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    Curly one

    I have started to write a program to control a radio transceiver (FT817) with an 18X and having a keypad and LCD. So far I have the Lcd display working and the keypad routine gets key presses, converts them to ascii and sends them to the LCD. So far so good. Then I turn off the device, come...
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    one wire keypad

    Hi everyone. I have just made up a 'one wire' keypad interface as described elsewhere in these forums. You know, the one based on resistors between row/columns. When I read the voltage by using the ADC command and then send that value back to the PC via sertxd in a loop, I get a varying value...
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    need for speed

    Is it possible to speed up my 28x1 by 'disconnecting', turning off hsersetup etc. I want to do a data logging program but a basic 'empty' for/next loop for say 100 iterations is taking approx 1/2 a sec. I'm not going to be able to do anything too quickly at that rate?:( (Forgot to mention that...
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