Can any one help me to read TTL signal(5V TTL-Compatible) to read with Microcontroller ?I am having Pressure sensor with output TTL. Sensor having 3 pins One is Vcc ,GND and Signal(5v -TTL Compatible ).
I am using stm32 Nucleo board . Please suggest me how to read it .
Thanks,
Hello,
As for as understand, you have analog type sensor. The main you problem, stm32 has a 3.3 V power supply. If I understand your problem correctly?!
You needed to use just level converter. For analog signal it will be simple passive or active dividers (reduce 5v to 3.3v).
regards
Thank you Segejus Borodinas,
Yes stm32 supports 3.3 only .
Does TTL compatible mean analog sensor ?
Thanks,
Hi Upendra,
if the description of the sensor says "TTL compatible" it is certainly a digital signal. The low level (= 2.4 V) can exceed 3.3 V, and has to be limited. A simple solution is using a 3V-Z-diode, anode connected to GND, cathode to the input of the STM32, and a series resistor (between output and input) of, say, 1 kOhm.
Hello,
Generally, if it digital sensor with I2C or SPI interface we needed more than one pin for interfacing. May be you 1-wire interface (generally is oped drain or open collector). You have only one, because, I suggested to you analog divider.
You should described more in details your sensor type.
Regards
Dear Upendra,
A solution similar to that of Joerg is to use two diodes in series in the direction of current flow such that they drop about 1.4 V if they are silicon diodes. This is a simple solution one drops only the excess voltage by froward biased diodes.
Best wishes
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