oleshobbyblog
Member
Hello,
This is my first post here. Although I had some electrical engineering at school, that knowledge has faded. So please bear with me.. I tried searching this forum, and to study the data sheets etc..but I am still not 100% sure of my findings.. Hoping someone can help me out..
The project:
I wish to connect an IR receiver to my Teensy LC. The project's supply voltage is 5V.
I don't have a nice schematic yet, but if needed I can make one, but I think my question is of a more generic nature. Please let me know so I can help you help me.
The problem:
I read that the max voltage the I/O pins on the LC should be exposed to is 3.3V. This led me to checking the output voltage from the IR sensor. From the datasheet I get:
VS = -0.3 to +6, and that VO = - 0.3 to (VS + 0.3)
I have a linear 5V to 3.3V regulator (TO-220) I can use here, but I think that still makes the VS = 3.3, and 3.3+0.3=3.6V.. Higher than the rated input on the Teensy LC pins.
The question(s):
Have I misunderstood? I am a bit fuzzy on how 3.3V in can become >3.3V out, but as I recall there were a few electrical concepts I struggled with at school, this could very well be one of them
Will this work ok, or will I fry my LC if I try this approach? Any alternative ideas on how to solve this?
Any input to this, probably rather simple, issue is greatly appreciated!
//Ole
This is my first post here. Although I had some electrical engineering at school, that knowledge has faded. So please bear with me.. I tried searching this forum, and to study the data sheets etc..but I am still not 100% sure of my findings.. Hoping someone can help me out..
The project:
I wish to connect an IR receiver to my Teensy LC. The project's supply voltage is 5V.
I don't have a nice schematic yet, but if needed I can make one, but I think my question is of a more generic nature. Please let me know so I can help you help me.
The problem:
I read that the max voltage the I/O pins on the LC should be exposed to is 3.3V. This led me to checking the output voltage from the IR sensor. From the datasheet I get:
VS = -0.3 to +6, and that VO = - 0.3 to (VS + 0.3)
I have a linear 5V to 3.3V regulator (TO-220) I can use here, but I think that still makes the VS = 3.3, and 3.3+0.3=3.6V.. Higher than the rated input on the Teensy LC pins.
The question(s):
Have I misunderstood? I am a bit fuzzy on how 3.3V in can become >3.3V out, but as I recall there were a few electrical concepts I struggled with at school, this could very well be one of them
Will this work ok, or will I fry my LC if I try this approach? Any alternative ideas on how to solve this?
Any input to this, probably rather simple, issue is greatly appreciated!
//Ole
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