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Hi,
If you have worked with the ADC0804, I would like to know how do you make sure you always read the LATEST measurement out of the 8 pins. I notice a few people have tried to use the ADC0804 or similar in order to take digital readings off an analog temperature sensor (such as the LM35). I have had trouble reading the measurements off the ADC0804, even when my sensor is surrounded by ice-cubes (to drop the temperature) the ADC output pins hardly ever change state. Once I manage to get a sensible reading off the ADC, it stays there regardless of tempereture changes, until I reboot the chip. Could this be a timing/clocking issue? I am controlling the ADC0804 directly from my PC's parallel port - I manually enable the chip, then take the WR pin from high to low and back to high, then drive the RD pin low and measure the voltages at the 8 output pins - I don't bother with the INT. Any advice would be welcomed.
thanks.
If you have worked with the ADC0804, I would like to know how do you make sure you always read the LATEST measurement out of the 8 pins. I notice a few people have tried to use the ADC0804 or similar in order to take digital readings off an analog temperature sensor (such as the LM35). I have had trouble reading the measurements off the ADC0804, even when my sensor is surrounded by ice-cubes (to drop the temperature) the ADC output pins hardly ever change state. Once I manage to get a sensible reading off the ADC, it stays there regardless of tempereture changes, until I reboot the chip. Could this be a timing/clocking issue? I am controlling the ADC0804 directly from my PC's parallel port - I manually enable the chip, then take the WR pin from high to low and back to high, then drive the RD pin low and measure the voltages at the 8 output pins - I don't bother with the INT. Any advice would be welcomed.
thanks.