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Ok, I do see the laser beam with the processor through the inputs. I just need to figure out how to only give valid outputs when it sees the pulses at one per 100mS or 10 per second (10Hz). I will try ...

Thank you, I appreciate your input. I have some 8 and 10 MHZ crystals. I will start with the 8mhz.

How can I use other ports of inputs to act like port B. In the past (it has been long time ago) I ...

I built a project in the past for DRO using encoder and port B and display on LCD.
How can I use the principal to other inputs ports?
What crystal power you suggest for this project?
Thank you

I tried to code something similar to what you suggested in your previous post. I tried to set variables to store the ON time and the OFF time. Subtract the low from the high. If it's 99mS then it's va ...

The phototransistors that I used have no base lead.
My testing went well.
The array worked as temtronic describe. I tested the array using 6 volts battery. The shield between the phototransistor is ...

Last night, I soldered 8 phototransistors to a board. I also soldered 10k resistors for pullups. I made a shield around each phototransistor so only straight light go through and allow horizontal ligh ...

I disassembled the unit one more time. I looked at the components with high power magnifier. The sensor maybe just an array of 19 phototransistors or 19 photodiodes. They look like they have flat head ...

Ttelmah,
I just want to duplicate the original receiver and make mine has more vertical sensing/display. The original sensing hardware only about 5 CM or 2 inches.
When testing the original receiver ...

The sender unit is way bigger and more complicated than the receiver. It has motors for the gyroscope for the self leveling and calibration, also to spin the mirror. Several buttons to turn on, calibr ...

Ttelmah,
I disassembled the original receiver. The only hardware that I see are:
Something rectangle looks like LDR to capture the light. It has about 20 pins for power and outputs.
It feed to a p ...

Ttelmah,
I have two industrial, good quality self-leveling laser levels.
One of them is for indoor use, it has a visible red light, it has few operation modes (horizontal, vertical, both to generate ...

Ttelmah,
I appreciate the explanation. It make sense.
On the laser transmitter or the sender unit, I didn't detect any type of modulation. When the signal hit the phototransistor, it's On for that s ...

I checked the signal from the phototransistor. When the laser is on, I have 10 square pulses ON per second, about 0.00028 second each. Or one square high 280us ON per 100ms and then off till the next ...

I appreciate the inputs. I will try to use the oscilloscope to capture the high/low timing from the phototransistor. I will post the results.
My hardware filters the wavelength correctly. I tried us ...

The phototransistor that I used have a very narrow sensitivity, peak at 630nm plus minus about 20nm down to 0 sensitive to other spectrum. I also have optical red filter.
Both original and my receiv ...