Hello,
I am working on a project where I will be designing a touchless keypad. I am thinking of using a grid of ir sensors as shown in the attached pic. I tried using ultrasonic sensor but ultrasonic signal spreads out and is not good here.
So i think ir will be a good choice since ir rays travel in a straight line, correct me if i am wrong. So the idea is when the user breaks Tx_1 & Tx_2 ray, that will be a number 1, and so on and so forth.
So my questions:
1. Does ir signal/ray travel in a straight line as i have drawn in the pic with red color.
2. Do i need to amplify the transmit signal before sending it? And same for the receive signal, does it need to be amplified?
Thank you for your help.
I am working on a project where I will be designing a touchless keypad. I am thinking of using a grid of ir sensors as shown in the attached pic. I tried using ultrasonic sensor but ultrasonic signal spreads out and is not good here.
So i think ir will be a good choice since ir rays travel in a straight line, correct me if i am wrong. So the idea is when the user breaks Tx_1 & Tx_2 ray, that will be a number 1, and so on and so forth.
So my questions:
1. Does ir signal/ray travel in a straight line as i have drawn in the pic with red color.
2. Do i need to amplify the transmit signal before sending it? And same for the receive signal, does it need to be amplified?
Thank you for your help.