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I need to interface a sensor with TTL output with a Microcontroller.
May I know how to approach this.
May I know how to approach this.
Interfacing sensor with TTL output with Microcontroller
- Thread starter hoyyoth
- Start date
Also, what kind of output is it, high frequency, audio frequency or simple toggle on and off every few seconds? That can determine if a simple level converter will work of not.
Datasheet for the sensor does not specify how low the Vcc can go. They give an example at 4.0V. Maybe it will work at 3.3V???
EDIT: Some web sites state that the minimum operating voltage for the sensor is 2.5V, so it should operate at 3.3V. However, not sure how that affects the calibration of the data, nothing is specified in its datasheet except operation at 4.0V. Note battery voltage in example below as low as 3V.
Datasheet for the sensor does not specify how low the Vcc can go. They give an example at 4.0V. Maybe it will work at 3.3V???
EDIT: Some web sites state that the minimum operating voltage for the sensor is 2.5V, so it should operate at 3.3V. However, not sure how that affects the calibration of the data, nothing is specified in its datasheet except operation at 4.0V. Note battery voltage in example below as low as 3V.
Last edited:
MCU is working at 3.3V supply
It is not high frequency.Simple toggle,I believe.The data sheet does not specify anything much.
It says:
Measurement range of dose rate 0.1 µSv/h to 100 mSv/h
Pulse count rate 5 cpm ± 15% for 1 µSv/h radiation dose rate
Energy response 50 KeV to above 2 MeV
Output pulse level Equal to supply voltage (positive going) Output pulse width 50 μs to 200 μs (LOW→HIGH→LOW)
So it seems like a Geiger counter, with a series of irregular "clicks" coming at a rate dependent on the radiation level. It's not clear what the microprocessor is expected to do, but if it's driving a display then the easiest way is simply to count pulses over a period of time and set the display accordingly. But it would be pretty jumpy if the pulse rate isn't constant. You could filter it (infinite impulse response?) but that would slow the response down. And 5 cycles per minute is a very slow rate to be turning into a numerical count that would make any sense to look at.
Measurement range of dose rate 0.1 µSv/h to 100 mSv/h
Pulse count rate 5 cpm ± 15% for 1 µSv/h radiation dose rate
Energy response 50 KeV to above 2 MeV
Output pulse level Equal to supply voltage (positive going) Output pulse width 50 μs to 200 μs (LOW→HIGH→LOW)
So it seems like a Geiger counter, with a series of irregular "clicks" coming at a rate dependent on the radiation level. It's not clear what the microprocessor is expected to do, but if it's driving a display then the easiest way is simply to count pulses over a period of time and set the display accordingly. But it would be pretty jumpy if the pulse rate isn't constant. You could filter it (infinite impulse response?) but that would slow the response down. And 5 cycles per minute is a very slow rate to be turning into a numerical count that would make any sense to look at.
